High-Speed Fiber-Coupled Detectors

  • Sensitive to Wavelengths from 400 - 1700 nm
  • Bandwidths from 1 to 5 GHz
  • Rise Times as Short as 50 ps





Replaces the battery in our DET series detectors and includes the LDS12B power supply and DET2A power adapter, shown connected.

Related Items

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Selection Guide for Fiber-Coupled Detectors
Wavelength Element Bandwidth Model
400 - 1100 nm Si 1 GHz DET02AFC
800 - 1700 nm InGaAs 1.2 GHz DET01CFC
800 - 1700 nm 5 GHz (Max) DET08CFC

Click to Enlarge

PDA200C Benchtop Photodiode Amplifier Connected to a DET02AFC Photodetector Using an SMA-to-BNC Cable


  • Four Models Cover Wavelengths from 400 - 1700 nm
  • Bandwidths Ranging from 1 to 5 GHz
  • Rise Times from 50 ps to 1 ns
  • Connect to Single Mode (SM) or Multimode (MM) Fiber
  • FC/PC Fiber Input Connector
  • SMA Output Connector

Thorlabs offers a variety of fiber-coupled, high-speed, high-bandwidth photodetectors designed to connect to a single mode or multimode fiber with an FC/PC-terminated input. Together, these detectors are sensitive from the visible to the near infrared (400 - 1700 nm); please see the "Selection Guide" table to the right for the exact spectral range covered by each detector. All detectors shown here feature GHz signal bandwidths and the same ease of use as the rest of our popular DET series. These detectors are designed to perform in test or measurement applications, including research in the fields of data communications, analog microwave, and general high-speed photonics. For comparable detection of free-space radiation, Thorlabs offers high-speed free-space detectors. We also carry a variety of internally biased photodiodes that feature the same ease of use as our fiber-coupled photodetectors but operate at slower speeds. Our biased photodetectors are compatible with our benchtop photodiode amplifier and PMT transimpedance amplifier.

These fiber-coupled detectors are reverse biased and contain an internal bias battery, producing a linear response to the incident input light. To maintain the high signal bandwidth, the signal is output through an SMA connector. Thorlabs offers a complete range of electrical adapters and cables, including SMA cables and SMA-to-BNC adapters, for monitoring the output signal with an oscilloscope or other measurement electronics.

Our Si-based fiber-coupled detectors are designed for use in the 400 - 1100 nm wavelength range and provide a bandwidth of 1 GHz (Item # DET02AFC) or 2 GHz (Item # DET025AFC). For applications extending into the near infrared, consider our InGaAs-based fiber-coupled detectors, which provide detection in the 800 - 1700 nm wavelength range and provide a bandwidth of 1.2 GHz (Item # DET01CFC) or 5 GHz (Max) (Item # DET08CFC). When looking at high-speed signals, Thorlabs recommends using a 50 Ω load resistor. For lower bandwidth applications, our variable terminator or fixed stub-style terminators quickly adjusts the measured voltage.

All of these detectors include a replaceable A23 12 VDC Bias battery, providing an extremely low-noise power source. This battery can be replaced by the DET2B power adapter bundle (sold below), which is ideal for applications where a small increase in the signal noise due to noise in the line voltage is permissible or the finite lifetime of a battery is not acceptable. Please note that due to slight physical variations of the positive terminal from manufacturer to manufacturer, Thorlabs recommends using only an Energizer® battery in our DET series photodetectors.

Wavelength Range 400 - 1100 nm 400 - 1100 nm 800 - 1700 nm 800 - 1700 nm
Material Si Si InGaAs InGaAs
Bandwidth (-3 dB)a,b,c 1 GHz 2 GHz 1.2 GHz 5 GHz (Max)
Fiber Input FC/PC FC/PC FC/PCd FC/PC
Signal Output SMA SMA SMA SMA
Minimum Resistor Load 50 Ω 50 Ω 50 Ω 50 Ω
Maximum Peak Power 18 mW 18 mW 18 mW 100 mW
Saturation Power (CW) - - 5.5 mW (1550 nm)b -
Output Voltage 0 to 3.3 V (50 Ω)
0 to 10 V (Hi-Z)
2 V (Max)e 0 to 1 V (50 Ω)f
0 to 10 V (Hi-Z)
2 V (Max)e
Rise Time (tr)a,b,c 1 ns @ 730 nm (Max) 150 ps @ 653 nm, 20/80% (Typ.) <1 nsg @ 1310 nm 70 ps @ 952 nm, 20/80% (Typ.)
Fall Time (tf)a,b,c 1 ns @ 730 nm (Max) 150 ps @ 653 nm, 80/20% (Typ.) <1 nsg @ 1310 nm 110 ps @ 952 nm, 80/20% (Typ.)
Bias Voltage 12 V
Dark Current 126 pAh 35 pAa,h 0.235 nAa,h 1.5 nAa,h
NEP (Maximum) 9.5 x 10-15 W/√Hz
(@ 730 nm)
9.29 x 10-15 W/√Hz
(@ 730 nm)
4.5 x 10-15 W/√Hz
(@ 1550 nm)
2 x 10-15 W/√Hz
(@ 1550 nm)
Junction Capacitance 1.73 pF (Max) 1.73 pF (Max) 2.4 pF (Typical) 0.3 pF
Photodiode Element FDS02 FDS02 FGA01FC -
  • Measured with specified bias voltage of 12 V.
  • For a 50 Ω Load
  • Low battery voltage will result in slower rise times and decreased bandwidth.
  • Although this detector has FC/PC input connectors, our testing shows it may be used with FC/APC patch cables with no measurable differences in performance.
  • A higher output voltage will decrease the bandwidth.
  • Calculated based upon peak responsivity and damage threshold.
  • These rise and fall times are tested and guaranteed in our production units. A theoretical rise time of 292 ps can be calculated using the formulas found in chapter 4.6 of the manual or the Photodiode Tutorial tab.
  • For a 1 MΩ Load
DET02AFC Spectral Response
Click to Enlarge

Click Here for Raw Data
DET02AFC Spectral Response
Click to Enlarge

Click Here for Raw Data
DET01CFC Spectral Response
Click to Enlarge

Click Here for Raw Data
DET08C Series Spectral Response
Click to Enlarge

Click Here for Raw Data

Signal Output

SMA Female

SMA Female

0 - 10 V w/ 50 Ω

Battery Lifetime

When using a battery-operated photodetector it is important to understand the battery’s lifetime and how this affects the operation of the detector. As a current output device, the output current of the photodetector is directly proportional to the light incident on the detector. Most users will convert this current to a voltage by using a load-terminating resistor. The resistance value is approximately equal to the circuit gain. For very high speed detectors, such as those sold on this page, it is very important to use a 50 Ω terminating resistor to match the impedance of standard coax cables to reduce cable reflections and improve overall signal performance and integrity. Most high bandwidth scopes come equipped with this termination.

The battery usage lifetime directly correlates to the current used by the detector. Most battery manufacturers provide a battery lifetime in terms of mA hr. For example, the battery supplied with the DET08CFC detectors is rated for 40 mA hrs. This means that it will reliably operate for 40 hr at a current draw of 1.0 mA. This battery will be used in the following example on how to determine battery lifetime based on usage.

For this example we have a 780 nm light source with an average 1 mW power is applied to an DET08CFC. The responsivity of a biased photodetector based on the response curve at this wavelength is 0.5 A/W. The photocurrent can be calculated as:


Given the battery has a rated lifetime of 40 mA hr, the battery will last:


or 3.3 days of continuous use. By reducing the average incident power of the light to 10 µW, the same battery would last for about 333 days when used continuously. When using the recommended 50 Ω terminating load, the 0.5 mA photocurrent will be converted into a voltage of:


If the incident power level is reduced to 10 µW, the output voltage becomes 0.25 mV. For some measurement devices this signal level may be too low and a compromise between battery life and measurement accuracy will need to be made.

When using a battery-powered, biased photodetector, it is desirable to use as low a light intensity as is possible, keeping in mind the minimum voltage levels required. It is also important to remember that a battery will not immediately cease producing a current as it nears the end of its lifetime. Instead, the voltage of the battery will drop, and the electric potential being applied to the photodiode will decrease. This in turn will increase the response time of the detector and lower its bandwidth. As a result, it is important to make sure the battery has sufficient voltage (as given in the Troubleshooting chapter of the detector's manual) for the detector to operate within its specified parameters. The voltage can be checked with a multimeter.

Another suggestion to increase the battery lifetime is to remove, or power down the light source illuminating the sensor. Without the light source, the photodetector will continue to draw current proportional to the photodetector’s dark current, but this current will be significantly smaller. For example, the DET08CFC has a dark current less than 1.5 nA.

For applications where a DET series photodetector is being continuously illuminated with a relatively high-power light source or if having to change the battery is not acceptable, we offer the DET2B power adapter bundle, which includes the power adapter and power supply (sold below). The drawback to this option is the noise in the line voltage will add to the noise in the output signal and could cause more measurement uncertainty.

Photodiode Tutorial

Theory of Operation

A junction photodiode is an intrinsic device that behaves similarly to an ordinary signal diode, but it generates a photocurrent when light is absorbed in the depleted region of the junction semiconductor. A photodiode is a fast, highly linear device that exhibits high quantum efficiency and may be used in a variety of different applications.

It is necessary to be able to correctly determine the level of the output current to expect and the responsivity based upon the incident light. Depicted in Figure 1 is a junction photodiode model with basic discrete components to help visualize the main characteristics and gain a better understanding of the operation of Thorlabs' photodiodes.

Equation 1
Photodiode Circuit Diagram
Figure 1: Photodiode Model

Photodiode Terminology

The responsivity of a photodiode can be defined as a ratio of generated photocurrent (IPD) to the incident light power (P) at a given wavelength:

Equation 2

Modes of Operation (Photoconductive vs. Photovoltaic)
A photodiode can be operated in one of two modes: photoconductive (reverse bias) or photovoltaic (zero-bias). Mode selection depends upon the application's speed requirements and the amount of tolerable dark current (leakage current).

In photoconductive mode, an external reverse bias is applied, which is the basis for our DET series detectors. The current measured through the circuit indicates illumination of the device; the measured output current is linearly proportional to the input optical power. Applying a reverse bias increases the width of the depletion junction producing an increased responsivity with a decrease in junction capacitance and produces a very linear response. Operating under these conditions does tend to produce a larger dark current, but this can be limited based upon the photodiode material. (Note: Our DET detectors are reverse biased and cannot be operated under a forward bias.)

In photovoltaic mode the photodiode is zero biased. The flow of current out of the device is restricted and a voltage builds up. This mode of operation exploits the photovoltaic effect, which is the basis for solar cells. The amount of dark current is kept at a minimum when operating in photovoltaic mode.

Dark Current
Dark current is leakage current that flows when a bias voltage is applied to a photodiode. When operating in a photoconductive mode, there tends to be a higher dark current that varies directly with temperature. Dark current approximately doubles for every 10 °C increase in temperature, and shunt resistance tends to double for every 6 °C rise. Of course, applying a higher bias will decrease the junction capacitance but will increase the amount of dark current present.

The dark current present is also affected by the photodiode material and the size of the active area. Silicon devices generally produce low dark current compared to germanium devices which have high dark currents. The table below lists several photodiode materials and their relative dark currents, speeds, sensitivity, and costs.

Material Dark Current Speed Spectral Range Cost
Silicon (Si) Low High Speed Visible to NIR Low
Germanium (Ge) High Low Speed NIR Low
Gallium Phosphide (GaP) Low High Speed UV to Visible Moderate
Indium Gallium Arsenide (InGaAs) Low High Speed NIR Moderate
Indium Arsenide Antimonide (InAsSb) High Low Speed NIR to MIR High
Extended Range Indium Gallium Arsenide (InGaAs) High High Speed NIR High
Mercury Cadmium Telluride (MCT, HgCdTe) High Low Speed NIR to MIR High

Junction Capacitance
Junction capacitance (Cj) is an important property of a photodiode as this can have a profound impact on the photodiode's bandwidth and response. It should be noted that larger diode areas encompass a greater junction volume with increased charge capacity. In a reverse bias application, the depletion width of the junction is increased, thus effectively reducing the junction capacitance and increasing the response speed.

Bandwidth and Response
A load resistor will react with the photodetector junction capacitance to limit the bandwidth. For best frequency response, a 50 Ω terminator should be used in conjunction with a 50 Ω coaxial cable. The bandwidth (fBW) and the rise time response (tr) can be approximated using the junction capacitance (Cj) and the load resistance (RLOAD):

Equation 3

Noise Equivalent Power
The noise equivalent power (NEP) is the generated RMS signal voltage generated when the signal to noise ratio is equal to one. This is useful, as the NEP determines the ability of the detector to detect low level light. In general, the NEP increases with the active area of the detector and is given by the following equation:

Photoconductor NEP

Here, S/N is the Signal to Noise Ratio, Δf is the Noise Bandwidth, and Incident Energy has units of W/cm2. For more information on NEP, please see Thorlabs' Noise Equivalent Power White Paper.

Terminating Resistance
A load resistance is used to convert the generated photocurrent into a voltage (VOUT) for viewing on an oscilloscope:

Equation 4

Depending on the type of the photodiode, load resistance can affect the response speed. For maximum bandwidth, we recommend using a 50 Ω coaxial cable with a 50 Ω terminating resistor at the opposite end of the cable. This will minimize ringing by matching the cable with its characteristic impedance. If bandwidth is not important, you may increase the amount of voltage for a given light level by increasing RLOAD. In an unmatched termination, the length of the coaxial cable can have a profound impact on the response, so it is recommended to keep the cable as short as possible.

Shunt Resistance
Shunt resistance represents the resistance of the zero-biased photodiode junction. An ideal photodiode will have an infinite shunt resistance, but actual values may range from the order of ten Ω to thousands of MΩ and is dependent on the photodiode material. For example, and InGaAs detector has a shunt resistance on the order of 10 MΩ while a Ge detector is in the kΩ range. This can significantly impact the noise current on the photodiode. For most applications, however, the high resistance produces little effect and can be ignored.

Series Resistance
Series resistance is the resistance of the semiconductor material, and this low resistance can generally be ignored. The series resistance arises from the contacts and the wire bonds of the photodiode and is used to mainly determine the linearity of the photodiode under zero bias conditions.

Common Operating Circuits

Reverse Biased DET Circuit
Figure 2: Reverse-Biased Circuit (DET Series Detectors)

The DET series detectors are modeled with the circuit depicted above. The detector is reverse biased to produce a linear response to the applied input light. The amount of photocurrent generated is based upon the incident light and wavelength and can be viewed on an oscilloscope by attaching a load resistance on the output. The function of the RC filter is to filter any high-frequency noise from the input supply that may contribute to a noisy output.

Reverse Biased DET Circuit
Figure 3: Amplified Detector Circuit

One can also use a photodetector with an amplifier for the purpose of achieving high gain. The user can choose whether to operate in Photovoltaic of Photoconductive modes. There are a few benefits of choosing this active circuit:

  • Photovoltaic mode: The circuit is held at zero volts across the photodiode, since point A is held at the same potential as point B by the operational amplifier. This eliminates the possibility of dark current.
  • Photoconductive mode: The photodiode is reversed biased, thus improving the bandwidth while lowering the junction capacitance. The gain of the detector is dependent on the feedback element (Rf). The bandwidth of the detector can be calculated using the following:

Equation 5

where GBP is the amplifier gain bandwidth product and CD is the sum of the junction capacitance and amplifier capacitance.

Effects of Chopping Frequency

The photoconductor signal will remain constant up to the time constant response limit. Many detectors, including PbS, PbSe, HgCdTe (MCT), and InAsSb, have a typical 1/f noise spectrum (i.e., the noise decreases as chopping frequency increases), which has a profound impact on the time constant at lower frequencies.

The detector will exhibit lower responsivity at lower chopping frequencies. Frequency response and detectivity are maximized for

Photoconductor Chopper Equation

Posted Comments:
user  (posted 2024-03-29 21:44:50.07)
ksosnowski  (posted 2024-03-29 09:53:32.0)
Hello, thanks for reaching out to Thorlabs. The most common issue users face with this detector is with the measurement load impedance. 50 Ohm is required as a load to get the full bandwidth of this fast detector. Some oscilloscopes with higher input impedance like 1MOhm will decrease the bandwidth unless a 50 Ohm termination resistor is used in parallel at the input. Our VT2 and FT500 around common to use for this purpose. This load directly effects the RC time constant of the photodiode system resulting in 20000x higher rise time for a 1MOhm load versus 50 Ohm. The load in Ohms also serves as the gain in V/A in this setup so 50 Ohm is expected to result in a smaller amplitude response than higher impedance measurements. If a combination of higher bandwidth and gain are needed, then a transimpedance amplifier may be necessary to readout a very small optic signal as a significant voltage. A member from your local tech support team has reached out directly to discuss this application in further detail.
子康 王  (posted 2024-03-14 12:04:48.97)
ksosnowski  (posted 2024-03-14 11:46:11.0)
Hello, thanks for reaching out to Thorlabs. DET01CFC's noise floor is defined by our NEP value 4.5 x 10-15 W/sqrt(Hz) which is a density of RMS noise in the frequency spectrum and given at the 1:1 signal to noise ratio (SNR) point. This NEP is given near peak responsivity, so non-peak wavelengths will have proportionally higher noise floor. One must multiply the NEP value by the square root of bandwidth to obtain the optical power level of the noise floor for the system. If using the full bandwidth of DET01CFC at peak wavelength the noise floor is approximately 0.16 nW. As this is only the 1:1 SNR point, most practical setups will require a higher SNR which must be determined by the user for the application. A member from your local tech support team has reached out to discuss your application in further detail.
allan bereczki  (posted 2023-08-22 07:36:19.533)
Hello. does thorlabs sell replacement phtotodiode for DET08CFC?
ksosnowski  (posted 2023-08-22 11:37:35.0)
Hello Allan, thanks for reaching out to Thorlabs. The photodiode used in DET08x and DET02x series are not ones we sell separately. DET025x uses our FDS02 diode and DET01x uses our FGA01FC. We are however able to replace the photodiode inside these detectors if the device is damaged. I have reached out directly to discuss your application in further detail.
Yazan Lampert  (posted 2023-08-11 18:31:32.743)
Dear all, we are interested in purchasing DET08CFC from you and I would like to know more about the maximum peak power you provide. Is the value 100 mW the damage threshold or is it the saturation power of the diode? Best regards, Yazan Lampert
ksosnowski  (posted 2023-08-11 04:20:00.0)
Thanks for reaching out to Thorlabs. DET08x series' 100mW max power is given by the OEM relative to the safe photocurrent limit on the microwire bonds to the sensor. Exceeding this input can generate excessive heat and damage, resulting in failure of the photodiode as an open circuit with zero current response. This is a thermal effect however the microwires will also have a very short thermal time constant so spiking past this is not recommended. This is separate from optical saturation which occurs after the output voltage passes the applied bias level. Due to the 50 Ohm load required for high bandwidth on these devices, saturation typically occurs well after the photocurrent limit. Saturation Power will depend on the load resistance and wavelength response/photocurrent which yield an output at the fixed saturation i.e. bias voltage. Saturation leads to accelerated diode aging and can cause a permanent increase in device dark current. These effects can occur relative to how far past saturation the device is operated and for how long. As saturation is where the output linearity suffers, it is not generally considered useful to operate at or past this point. We further recommend limiting the output swing on these devices to 2V max amplitude. Typical scopes or amplifiers may see slew limited performance in a combined large signal regime with high speed operation though this does largely depend on the measurement device used on the DET.
cdolbashian  (posted 2023-07-24 08:54:07.0)
Thanks for reaching out to Thorlabs. The noise floor characteristics are described by the Noise Equivalent Power (NEP) spec of the detector. NEP is defined as the optical power required for 1:1 SNR in a system, considering the peak response wavelength, and normalized to 1Hz. As electrical noise occurs across a frequency spectrum, we have measured the entire bandwidth of the detector and integrated noise across this and normalized for the NEP rating. This allows you to consider various system bandwidths with a single rating. For better linearity you would want higher SNR. If you use a lowpass filter on the output of this, that could further restrict the total bandwidth, reducing the noise spectrum sampled and total noise seen. So having excessive bandwidth beyond the actual experiment will only introduce extra noise from that higher frequency part of the noise spectrum. I recommend viewing the Photodiode Tutorial tab on this page which links to our NEP whitepaper with further details on this topic.
Madhav Gupta  (posted 2023-07-20 21:25:40.093)
Hello I am currently using DET025AC/M as a fluorescence detector in an optical microscope. I am using AMP100 (https://www.thorlabs.com/thorproduct.cfm?partnumber=AMP100) as a transimpedance amplifier, and trying to measure the output voltage using a standard oscilloscope or an arduino. Unfortunately, the voltage reading is quite low so I am trying to debug what the problem is. I had a few questions: 1) Is the AMP100 compatible with DET025AC/M? 2) On the DET025AC/M webpage, the PMT transimpedance amplifier is recommended (https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=8862). What is the main different between PMT and the AMP100? Do I need to purchase the PMT for my experiments? Please let me know. If you think the AMP100 should work, I'll try and see if there is any alignment error in my microscope. Also, please let me know if you suggest any other solutions on how to read out the photodiode voltage for my experiment. Thanks a lot, Madhav
cdolbashian  (posted 2023-07-25 08:54:07.0)
Thank you for reaching out to us with this inquiry. Depending on the signal you are detecting, and your instrumentation, you might be exceeding the bandwidth of the amplifier, thus seeing little-to-no amplification. The AMP100 has a maximum 1kHz bandwidth, while the PMT amplifier (TIA60) has a 3dB bandwidth of ~60MHz. I have contacted you directly to troubleshoot this issue. For future troubleshooting help, please contact techsupport@thorlabs.com as that is our dedicated support channel!
user  (posted 2023-04-27 15:44:00.937)
hello, We are using DET08CFC/M photodetector to measure the rise time of a 100 ns pulse. What we expect is a perfect square pulse, but we are observing a pulse with rise/ fall time of around 50 ns (which is not expected). Can you please comment on this? (We had ensured that the battery is supplying sufficient volts) thanks.
ksosnowski  (posted 2023-05-25 11:02:14.0)
Hello, thanks for reaching out to Thorlabs. The two major things that directly effect DET bandwidth are the load resistance and the diode capacitance. The battery provides the bias source which keeps capacitance low and within the designed range. Together these form an RC lowpass filter which defines the cutoff frequency for the bandwidth. I would recommend to check termination resistance, and see if reducing the input power changes the distortion. Though full saturation doesn't occur until output reaches the 10V bias level, we do recommend limiting the output on DET08 series to 2V max to prevent pulse distortion.
Daniela Schubert  (posted 2023-03-16 10:14:23.76)
Dear Thorlabs-Team, which fiber-coupled photodetector do you recommend for the measurement of fs-pulses (e.g. Pav = 10mW, frep = 100MHz, Tp = 100 fs)? Best regards
ksosnowski  (posted 2023-03-17 06:35:10.0)
Hello Daniela, thanks for reaching out to Thorlabs. For ultrafast pulses like this I recommend considering our FPD series detectors from Menlo Systems. FPD510-FC-VIS is one fiber coupled version with silicon photodiode. These are quite sensitive devices and would require attenuation to avoid damaging the sensor. The saturation and damage thresholds for the FPD series are given in the Specs table on our website. The DET series on this specific page are not optimized for ultrafast pulses and will see effective attenuation due to the high bandwidth of pulses in the femtosecond regime as standard photodiodes act like a lowpass filter up to their bandwidth. I have reached out directly to discuss this application further.
subba rao y v  (posted 2022-10-07 13:08:32.88)
Dear Sir, We purchased the detector DET08CFC/M and also a DET2B power supply. In the description it is mentioned peak power is 100mW. Now I want to connect the CW laser. Can I connect the CW laser power of 20mW. Kindly reply the optical input power range for DET08CFC/M. Regards, Y. V. Subba rao.
ksosnowski  (posted 2022-10-10 05:33:22.0)
Thanks for reaching out to Thorlabs. We do not have an exact CW limit for the power, as this can vary with wavelength and load, but it is recommended to keep operation below saturation, and with DET08CFC we recommend further limiting the output to <2V for best bandwidth. In most cases, 20mW will saturate the sensor which can lead to early sensor degradation. There is a photocurrent limit of 0.5mA due to the DET08CFC sensor's small internal wires, this thermal effect will limit the continuous photocurrent the unit can deliver but under peak conditions it can briefly sustain higher currents. With 50 Ohm loads, this photocurrent limit will occur before saturation for the design wavelength range.
Nikita Kikilich  (posted 2022-07-14 06:28:26.907)
Hi. My photodetector is behaving strangely. I detect pulses with a length of 100 ns, and I see a signal in the form of a saw (very long fall time). With another photodetector from another company, everything is OK. Could you tell if the photodetector is possibly damaged? What could have led to this and what went wrong in it? Due to what did his fall time increase physically?
ksosnowski  (posted 2022-07-28 04:35:07.0)
Thanks for contacting Thorlabs. General technical issues like this are best direct to techsupport@thorlabs.com. Regarding these issues, I recommend to check the battery voltage is above 9V and replace if needed. Make sure to use the shortest BNC cable with no extra attachments. A higher system capacitance and load resistance will negatively effect bandwidth and rise time directly. A low battery will drop the bias voltage and raise capacitance as well. Reducing input optical power can also check if saturation is effecting the measurement speed. I have reached out directly to discuss this issue further.
user  (posted 2022-05-09 16:24:20.757)
Can the DET02AFC and DET025AFC be used with an FC/APC patch cable (similar to how the DET01CFC and DET08CFC can be used with FC/APC)? Thank you for the help.
ksosnowski  (posted 2022-05-13 01:42:48.0)
Thanks for reaching out to Thorlabs. While we have not tested the DET02AFC and DET025AFC directly with FC/APC connectors, we do not generally expect any issues with this application. It is designed to couple FC/PC cores 70um or smaller, so at this upper limit there would be some inherent loss due to the angled output, but at smaller core sizes it should have minimal effect on performance.
David Conlon  (posted 2022-02-14 16:59:03.467)
We have the detector DET08CFC/M and also a DET2B power supply for feeding it. Now we want to pack our system but the package of the DET2B is very big for our package. So I would ask, can we use another 12V-250mA power supply for our DET08? What can we do for its three pin power input socket?
cdolbashian  (posted 2022-02-18 04:57:52.0)
Thank you for reaching out to us David. The DET2B (power supply), when used with the DET2A (power adapter) and any of the DET* detectors, will function not as a power supply, but as a reverse bias module, taking the place of the 12V battery which is already included in the DET* units. Pinout information including voltage and current requirements can be found in the spec sheet for the DET2B: https://www.thorlabs.com/_sd.cfm?fileName=TTN148688-S01.pdf&partNumber=DET2B. I have reached out to you directly to discuss your application further. For future tech support inquiries, please feel free to reach out to us at Techsupport@thorlabs.com
user  (posted 2021-08-11 10:15:42.013)
I am trying to understand the difference between DET025AFC and DET02AFC. Why is the lower bandwidth option slightly cheaper? What really limits the bandwidth? The junction capacitance is the same but the bandwidths differ by 2x and the rise times by 7x (contradicting the information in the manuals). Do both feature DC-coupled outputs?
cdolbashian  (posted 2021-10-15 04:39:02.0)
Thank you for reaching out to us at Thorlabs! These devices have a slightly different implementation of the circuit design internally, allowing for a larger output voltage while maintaining a high bandwidth. We note in our photodiode tutorial here(https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=10741&tabname=bias%20voltage). As the output voltage increases, the effective voltage decreases. Based on our testing, we restrict the recommended output to 2V to maintain the specced response speed. Both devices are DC coupled. I have contacted you directly to discuss this further.
user  (posted 2021-08-05 11:44:25.427)
Do you have a SPICE model for the detector or a diode model that closely matches the characteristics of this device?
YLohia  (posted 2021-08-27 02:49:51.0)
Hello, thank you for contacting Thorlabs. Unfortunately, we do not have SPICE models or any other programmatic models for our photodiodes.
Daniela Manoel  (posted 2021-05-31 10:25:38.253)
If I send the light into this connector using no fiber optics, directly through free space, and manage to make a measurement, can I trust the detector response? Is there any big problem in operating the DET08FCPC like this? Thanks a lot. Regards
YLohia  (posted 2021-06-15 03:10:02.0)
Thank you for contacting Thorlabs. These fiber-coupled detectors have a ball lens which will take the diverging light from a fiber and will refocus it on to the detector surface. Using a free space source into the fiber-coupled input will likely cause an overfilling of the detector surface, yielding an increased rise/fall time on the order of micro seconds. Properly filling (not overfilling) the detector area will yield optimal response time.
user  (posted 2021-04-26 04:53:25.65)
Hi, I am looking at the specs of the DET08CFC photodetector but I cannot find the sensitivity (dBm). Could you provide this value or some estimate at 1550 nm? Thank you.
cdolbashian  (posted 2021-08-31 04:12:32.0)
Thank you for contacting us at Thorlabs. After discussing this with you directly, I found that you were interested in the minimum detectable optical power @1550nm. This can be calculated by following the methods outlined in our NEP white paper: https://www.thorlabs.com/images/TabImages/Noise_Equivalent_Power_White_Paper.pdf
Maged Esmail  (posted 2021-03-23 05:35:38.333)
Hi We have DET01CFC device in our lab. The problem is that we are not able to connect any fiber to this device. It is very strange. It looks it uses a different FC connector. Could you tell us what is this type of connectors and what is the suitable fiber connect that matches it? Thank you
asundararaj  (posted 2021-03-29 02:02:21.0)
Thank you for contacting Thorlabs. The DET01CFC has an FC/PC Fiber Input Connector and an SMA connector for the Electrical Signal Output. I have contacted you for further assistance.
Surjit kaman  (posted 2021-02-13 17:20:19.823)
Hii, I want it to connect the DET08CFC, to a lock-in amplifier/Oscilloscope. The scope has a 50-ohm impedance. Should I still use 50 ohm for the scope? What is the detector output?
asundararaj  (posted 2021-02-15 03:08:22.0)
Thank you for contacting Thorlabs. The output of a DET08CFC is the photocurrent, and if the oscilloscope already has a 50 Ω impedance then you do not need to have an additional 50 Ω termination. In this case, the output will be read across the impedance of the scope. 
Nordine Hendaoui  (posted 2020-12-29 08:37:35.187)
Hello, for using the DET01CFC, We have to purchase only the DET2B as power supply. This last is powerd by 220 v? Thanks
asundararaj  (posted 2020-12-29 04:52:40.0)
Thank you for contacting Thorlabs. The DET2B includes the DET power adapter and the LDS12B power supply. The power supply has a switchable AC input voltage (100, 120, or 230 VAC), which will have to be switched to 230 VAC setting. A region-specific power cord is also shipped with the LDS12B power supply based on your location. 
liangze pan  (posted 2020-05-18 13:10:42.937)
Hey,would you mind provide the frequency response curve of the photo detector of DET025AFC/M
YLohia  (posted 2020-05-27 09:39:50.0)
Hello, thank you for contacting Thorlabs. Unfortunately, we do not have a frequency response curve for this detector at the moment.
liangze pan  (posted 2020-05-07 15:50:29.337)
Hey,would you mind to provide the frequency response curve of the photo detector of DET025AFC/M.
YLohia  (posted 2020-06-09 11:16:31.0)
Hello, thank you for contacting Thorlabs. I have reached out to you directly to discuss your request.
Jo Wanki  (posted 2019-11-07 04:13:27.263)
I have a question. I am using DET08CFC / M. I'm wondering where to fit the laser to the DET08CFC / M INPUT part when measuring the pulse width.   Currently we inspect a laser set to a 12 nsec pulse width value. If we measure from the periphery to the center of the DET08CFC / M INPUT part, a value ranging from 10.8 nsec to 13 nsec is measured. So we wonder. Please let me know if there is any information on whether the laser should be placed in the center of the DET08CFC / M INPUT site, whether it should be around or measured.
YLohia  (posted 2019-11-07 10:32:51.0)
Thank you for contacting Thorlabs. For the maximum bandwidth, the spot should be <50% of the active area (ideally in the geometrical center of the photodiode). The edges of the detector tend to have a slower response time, and overfilling the detector will give a convolution of rise times across the active area.
Daniel Fernando Borrero  (posted 2019-10-25 11:24:28.08)
I would like to know if this detector can be used to do correlation counting experiments, I need to connect the detectors to a TCSPC module, will they work?
asundararaj  (posted 2019-10-29 03:05:31.0)
Thank you for contacting Thorlabs. The DET025AFC is not sensitive enough to count photons. You can find our Single Photon Counters here: https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=5255
Philip Skochinski  (posted 2019-10-21 14:05:44.74)
What is the voltage output for a given optical input? I need to be able to calculate the electrical power (in 50 Ohms) for a specific optical input power.
asundararaj  (posted 2019-10-21 04:59:14.0)
Thank you for contacting Thorlabs. The output voltage from the detector can be estimated from the optical power incident using following equation: Voltage measured (V) = Optical Input (W) * Responsivity (A/W) * Terminating Resistance (Ohms) You can find the typical responsivity in the Graphs tab of this page or in the detector Manual.
user  (posted 2019-09-05 04:10:22.24)
Hello, For the DET01CFC(/M), you have specfified a Saturation Power (CW) = 5.5 mW (1550 nm) for a 50 Ohms load But for the DET08CFC/M, it is specified a Maximum Output Voltage VOUT=2 V (Max). Could you provide me with the optical power producing this 2V or what is the Saturation Power (CW) in mW for this detector? I aks this because I have a fast modulation (GHz) on top of CW light level. Thanks!
asundararaj  (posted 2019-09-06 04:19:13.0)
Thank you for contacting Thorlabs. The saturation threshold of a detector depends on many factors such as load resistance value, beam profile and size, modulation characteristics, wavelength, bias voltage, diode temperature, etc. For more details regarding this, please see our "Lab Fact" on photodiode saturation limits here: https://www.thorlabs.com/images/TabImages/Photodetector_Lab.pdf. We do not have an official spec on the saturation of the DET08CFC. I will reach out to you directly to discuss this further.
jwchew33  (posted 2018-07-09 01:53:12.373)
Greeting, I have a problem on DET08CFC/M. When I input square waveform at frequencies range from 1kHz to 1MHz into the photodetector, the output results did not show square waveform as expected. However, by using the same setup using PDA50B-EC detector (input 1kHz-400kHz), square waveform were observed. The pulse width used was 10us. I'm not sure what to do next. Any help? Thanks.
YLohia  (posted 2018-07-25 08:43:15.0)
Hello, thank you for contacting Thorlabs. What load impedance are you using on your oscilloscope? You should be using 50 Ohms for ideal performance. Is the battery for the DET fully charged? I will reach out to you directly to troubleshoot this further.
dlee103  (posted 2018-03-16 15:55:18.063)
What is the saturation threshold in mW?
YLohia  (posted 2018-04-19 03:39:43.0)
Hello, thank you for contacting Thorlabs. The saturation threshold of a detector depends on many factors such as load resistance value, beam profile and size, modulation characteristics, wavelength, bias voltage, diode temperature, etc. For more details regarding this, please see our "Lab Fact" on photodiode saturation limits here: https://www.thorlabs.com/images/TabImages/Photodetector_Lab.pdf. The DET025AFC is designed for pulsed/modulated light sources so the saturation limit can depend heavily on modulation characteristics. For example, a few milliwatts (1 to 2 mW for peak wavelength) is a safe theoretical estimate for CW sources, while we spec 18mW of peak power for pulsed sources. There is a resistor in series as a part of an RC circuit within the detector packaging, which limits the CW saturation power.
user  (posted 2016-11-04 16:39:22.64)
The manual linked for DET01CFC says that the battery should be installed negative side in. The diagram on the detector and the spring inside the battery cap suggest the opposite is true.
tfrisch  (posted 2016-11-04 04:50:19.0)
Hello, thank you for contacting Thorlabs. Section 4.11 of the manual calls for the battery to be inserted into the cap with the negative terminal inside the cap (in contact with the coil spring). When the cap is threaded back onto the housing, that will put the positive of the battery in the housing.
mitch  (posted 2016-03-22 09:10:48.767)
Hi, would it be possible for me to buy the metal fibre attachment that is attached to the input of these devices, by itself? I have purchased four of the free space, window versions (along with several tens of thousand dollars of other stuff) but I would like to try attach a fibre and I don't want to buy another set (the budget is now mostly spent!). Thanks
besembeson  (posted 2016-03-24 10:23:31.0)
Response from Bweh at Thorlabs USA: The sensor for the fiber versions comes coupled to the fiber connector. I will contact you if this is still suitable for your application.
songtaodu  (posted 2016-01-21 17:08:49.07)
When I used DET08CFC to detect output light of a fiber laser,wavelength of this laser is 1550nm and output is CW, the output voltage of DET08CFC kept at 13.2V while the laser power varied from 0.5mW to 3mW. When I turn off the laser, the output voltage of DET08CFC is zero. Can you tell me why this happened? Thanks!
jlow  (posted 2016-01-22 01:28:18.0)
Response from Jeremy at Thorlabs: It seems like you are basically measuring the voltage of the battery. The DET08CFC output s current signal. To use that with an oscilloscope or a voltmeter, you will need a load resistor or a terminator in series and measure the voltage drop across the resistor /terminator instead. An example of the terminator would be the T4119 terminator.
rmillett  (posted 2014-09-03 11:28:46.62)
Could a calibrated transfer curve be available for these detectors? In particular a response curve that could be calibrated out from low (kHz) frequencies to 5GHz?
jlow  (posted 2014-09-04 04:06:29.0)
Response from Jeremy at Thorlabs: We will look into measuring this and will e-mail you directly on our findings.
kmurari  (posted 2013-05-03 16:17:01.92)
My DET02AFC appears to be AC coupled although the manual says the SMA output is DC coupled. I have checked the battery, it is at >12 V. Can you please confirm if the unit is indeed DC coupled? Thanks!
jlow  (posted 2013-05-03 18:07:00.0)
Response from Jeremy at Thorlabs: The DET02AFC should be DC-coupled. I will contact you directly to troubleshoot this.
jlow  (posted 2012-12-21 10:39:00.0)
Response from Jeremy at Thorlabs: The detector's active area has a diameter of Ø120µm. There's also a Ø1.5mm ball lens in front of the detector. The output from a SMF28 fiber should be fully captured by the detector. For MM fiber, we recommend using a fiber with at most 50µm core size (around 0.2 NA).
neil.troy  (posted 2012-12-06 00:01:17.15)
For the fiber coupled devices will a single mode fiber's (say SMF-28 for example) divergence be fully captured by the detector? What about a multi-mode fiber? ie. what is the distance from the output face of the fiber to the detector surface as well as what are the detector's active areas?
tcohen  (posted 2012-04-05 15:19:00.0)
Response from Tim at Thorlabs to jzheng: Thank you for your feedback! The typical rise time of the DET02 will still be ~50ps at your wavelength.
jzheng  (posted 2012-03-26 01:56:40.0)
For the wavelength 1053nm, is the rise time of the DET02 (Si) still be 50ps? or will be longer? thank you.
jjurado  (posted 2011-02-08 18:27:00.0)
Response from Javier at Thorlabs to last poster: Thank you very much for submitting your request. For the high bandwidth detectors, a switch is not included since it significantly impairs the BW performance of the detector. In general, the DET’s draw very little current when no light is applied to the sensor. A battery will last on the order of years without a light signal applied. For these detectors, it is recommended that the light source is removed from the sensor when not being used. This will preserve the battery life.
user  (posted 2011-02-08 17:00:05.0)
It looks free space DET series has a battery switch. Do I have to remove a battery out of a box of the fiber input DETs every time?
klee  (posted 2009-10-05 14:39:34.0)
A response from Ken at Thorlabs to dinglu81: Thank you for pointing out the discrepancy. It should be 10^-15.
dinglu81  (posted 2009-10-02 05:41:25.0)
the NEP of this detector is 10^-15 in the specs but 10^-14 in the catalog. Which one is correct?
Greg  (posted 2009-02-18 15:37:16.0)
A response from Greg at Thorlabs to remi.riviere: Thank you for your interest in Thorlabs products. Please see the e-mail I sent you and reply to it with the detector you are looking for more information on. I will then check what other information we have available on it.
remi.riviere  (posted 2009-02-18 05:01:42.0)
Please provide a gain curve as well as the dynamic range of this detector.
acable  (posted 2008-08-31 12:59:35.0)
Please add NEP data.

The following table lists Thorlabs' selection of photodiodes, photoconductive, and pyroelectric detectors. Item numbers in the same row contain the same detector element.

Photodetector Cross Reference
Wavelength Material Unmounted
Amplified Detector,
OEM Package
200 - 1100 nm Si FDS010 SM05PD2A
Si - SM1PD2A - - -
240 - 1170 nm B-Si - - DET20X2 - -
320 - 1000 nm Si - - - PDA8A2 -
320 - 1100 nm Si FD11A SM05PD3A - PDF10A2 -
Si - a - DET100A2 a PDA100A2 a PDAPC2 a
340 - 1100 nm Si FDS10X10 - - - -
350 - 1100 nm Si FDS100
FDS100-CAL b
Si FDS1010
FDS1010-CAL b
- - -
400 - 1000 nm Si - - - PDA015A2
400 - 1100 nm Si FDS015 c - - - -
Si FDS025 c
FDS02 d
- DET02AFC(/M)
- -
400 - 1700 nm Si & InGaAs DSD2 - - - -
500 - 1700 nm InGaAs - - DET10N2 - -
0.6 - 16 µm LiTaO3 - - - PDA13L2e -
750 - 1650 nm InGaAs - - - PDA8GS -
800 - 1700 nm InGaAs FGA015 - - PDA015C2 -
InGaAs FGA21
InGaAs FGA01 c
- DET01CFC(/M) - -
InGaAs FDGA05 c - - PDA05CF2 PDAPC6
InGaAs - - DET08CFC(/M)
- -
InGaAs - - - PDF10C2 -
800 - 1800 nm Ge FDG03
SM05PD6A DET30B2 PDA30B2 -
Ge FDG05 - - - -
900 - 1700 nm InGaAs FGA10 SM05PD4A DET10C2 PDA10CS2 -
900 - 2600 nm InGaAs FD05D - DET05D2 - -
950 - 1650 nm InGaAs - - - FPD310-FC-NIR
1.0 - 5.8 µm InAsSb - - - PDA10PT(-EC) -
2.0 - 8.0 µm HgCdTe (MCT) VML8T0
VML8T4 f
- - PDAVJ8 -
2.0 - 10.6 µm HgCdTe (MCT) VML10T0
VML10T4 f
- - PDAVJ10 -
2.7 - 5.0 µm HgCdTe (MCT) VL5T0 - - PDAVJ5 -
2.7 - 5.3 µm InAsSb - - - PDA07P2 PDAPC9
  • If you are interested in purchasing the bare photodiode incorporated in these detectors without the printed circuit board, please contact Tech Support.
  • Calibrated Unmounted Photodiode
  • Unmounted TO-46 Can Photodiode
  • Unmounted TO-46 Can Photodiode with FC/PC Bulkhead
  • Pyroelectric Detector
  • Photovoltaic Detector with Thermoelectric Cooler
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Fiber-Coupled Si Detectors: 400 - 1100 nm

SMA Output on DET025AFC
Click to Enlarge

SMA Output on the DET025AFC Detector
  • DET02AFC: 1 GHz Bandwidth, 1 ns Rise Time
  • DET025AFC: 2 GHz Bandwidth, 150 ps Rise Time

The DET02AFC(/M) and DET025AFC(/M) high-speed, fiber-coupled detectors are designed for use in the 400 - 1100 nm spectral range. They use a Si detector element based on our FDS02 photodiode and have a 1 GHz and 2 GHz bandwidth, respectively. An 8-32 tapped mounting hole (M4 for the metric version) allows easy mounting to our Ø1/2" posts.

Item # Wavelength Detector Bandwidth Max Peak Power Rise Time Fall Time
DET02AFC 400 - 1100 nm Si 1 GHz 18 mW 1 ns (Max) 1 ns (Max)
DET025AFC 400 - 1100 nm Si 2 GHz 18 mW 150 ps (Typ.) 150 ps (Typ.)
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DET02AFC Support Documentation
DET02AFC1 GHz Si FC/PC-Coupled Photodetector, 400 - 1100 nm, 8-32 Tap
DET025AFC Support Documentation
DET025AFC2 GHz Si FC/PC-Coupled Photodetector, 400 - 1100 nm, 8-32 Tap
+1 Qty Docs Part Number - Metric Price Available
DET02AFC/M Support Documentation
DET02AFC/M1 GHz Si FC/PC-Coupled Photodetector, 400 - 1100 nm, M4 Tap
DET025AFC/M Support Documentation
DET025AFC/M2 GHz Si FC/PC-Coupled Photodetector, 400 - 1100 nm, M4 Tap
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Fiber-Coupled InGaAs Detectors: 800 - 1700 nm

SMA Output on DET08CFC
Click to Enlarge

SMA Output on the DET08CFC Detector
  • DET01CFC: 1.2 GHz Bandwidth, <1 ns Rise Time
  • DET08CFC: 5 GHz (Max) Bandwidth, 70 ps Rise Time

The DET01CFC(/M) is designed for use in the 800 - 1700 nm spectral range. It uses an InGaAs detector element based on our FGA01FC photodiode and features a 1.2 GHz bandwidth. It has an FC/PC input connector, and our testing shows that it can also be used with FC/APC patch cables with no measurable differences in performance. An 8-32 tapped mounting hole (M4 for the metric version) allows easy mounting to our series of Ø1/2" posts.

The DET08CFC(/M) is designed for use in the 800 - 1700 nm spectral range. It uses an InGaAs detector element and features a 5 GHz (Max) bandwidth. It has an FC/PC input connector. An 8-32 tapped mounting hole (M4 for the metric version) allows easy mounting to our Ø1/2" posts.

Item # Wavelength Detector Bandwidth Max Peak Power Rise Time Fall Time
DET01CFC 800 - 1700 nm InGaAs 1.2 GHz 18 mW <1 nsa <1 nsa
DET08CFC 800 - 1700 nm InGaAs 5 GHz (Max) 100 mW 70 ps (Typ.) 110 ps (Typ.)
  • The rise and fall times noted here are tested and guaranteed in our production units. A theoretical rise time of 292 ps can be calculated using the formulas found in chapter 4.6 of the manual or the Photodiode Tutorial tab.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
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DET01CFC Support Documentation
DET01CFC1.2 GHz InGaAs FC/PC-Coupled Photodetector, 800 - 1700 nm, 8-32 Tap
DET08CFC Support Documentation
DET08CFC5 GHz (Max) InGaAs FC/PC-Coupled Photodetector, 800 - 1700 nm, 8-32 Tap
+1 Qty Docs Part Number - Metric Price Available
DET01CFC/M Support Documentation
DET01CFC/M1.2 GHz InGaAs FC/PC-Coupled Photodetector, 800 - 1700 nm, M4 Tap
DET08CFC/M Support Documentation
DET08CFC/M5 GHz (Max) InGaAs FC/PC-Coupled Photodetector, 800 - 1700 nm, M4 Tap
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Replacement Battery for Photodetectors


The A23 is a replacement alkaline battery for Thorlabs' DET photodetectors. For cases where the finite lifetime of a battery is not acceptable, we also offer an AC power adapter; please see below for more information. Information on expected battery lifetime is in the Battery Lifetime tab above.

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A23 Support Documentation
A23Replacement 12 V Alkaline Battery for DET Series
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DET Power Adapter

DET2B Installation Procedure
  • DET2A: Power Adapter for DET Series Detectors
  • LDS12B: ±12 VDC Power Supply
  • DET2B: Bundle of the DET2A and LDS12B

DET2A Power Adapter
The DET2A is a power adapter for our DET series detectors. This power adapter will directly replace the A23 battery and spring-loaded cap to allow the detector to run directly from our LDS12B power supply (sold separately). The DET2A is also compatible with the PDA-C-72 power supply cable for custom connections. Note that when connecting the DET2A and the PDA-C-72 to power DET series detectors, only the brown (+12 V) and black (GND) pins are needed.

LDS12B Power Supply
The LDS12B is a ±12 VDC regulated power supply, which incorporates a current limit, enabling short circuit and overload protection; an on/off switch with an LED indicator; and a switchable AC input voltage (100, 120, or
230 VAC). A region-specific power cord is shipped with the LDS12B power supply based on your location.

DET2B Power Adapter Bundle
The DET2B power adapter bundle includes both the DET2A power adapter and the LDS12B power supply. This power adapter bundle can be used to replace the battery in our DET series detectors. To use the DET2B, simply replace the battery and spring-loaded cap with the included DET2A adapter, insert the 3-pin plug from the LDS12B power supply into the adapter, and screw the adapter into the detector. This procedure is depicted in the animation to the above right.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
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DET2A Support Documentation
DET2ADET Power Adapter
LDS12B Support Documentation
LDS12B±12 VDC Regulated Linear Power Supply, 6 W, 100/120/230 VAC
DET2B Support Documentation
DET2BDET Power Adapter & Power Supply Bundle