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OCT Balanced Detectors with Fast Monitor Output


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OCT Balanced Detectors with Fast Monitor Output

OCT Balanced Detectors with Fast Monitor Output
WavelengthBandwidths AvailableFast Monitor
Output Bandwidth
320 - 1000 nmDC - 15 MHz
DC - 75 MHz
DC - 100 MHz
DC - 200 MHz
DC - 1 MHz
800 - 1700 nm
Optimized for 1060 nm
(900 - 1400 nm Range)
DC - 400 MHz
DC - 1 GHz
DC - 3 MHz
Optimized for 1300 nm
(1200 - 1700 nm Range)
DC - 400 MHz
DC - 1.6 GHz

Features

  • Bandwidths up to 1.6 GHz Available
  • Four Wavelength Options
    • 320 - 1000 nm
    • 800 - 1700 nm
    • 900 - 1400 nm (Optimized for 1060 nm)
    • 1200 - 1700 nm (Optimized for 1300 nm)
  • >25 dB Common Mode Rejection
  • All Versions Available with Fiber Inputs
  • Free Space Inputs on Some Detectors (See Below for Details)
  • <6.5 mVRMS Output Voltage Noise
  • Switchable Power Supply Included

These balanced amplified photodetectors are designed specifically for OCT applications. They act as a balanced receiver by subtracting the two optical input signals from each other, resulting in the cancellation of common mode noise. This allows small changes in the signal path to be extracted from the interfering noise floor.

The detectors consist of two balanced photodiodes and an ultra-low-noise, high-speed transimpedance amplifier. The two photodiodes are matched to achieve an excellent common mode rejection ratio (CMRR), leading to better noise reduction. Please see the Operation Tab for more details. All of these detectors feature three fast monitor ports for reduced noise. In addition to the RF-output from the transimpedance amplifier, the Monitor+ and Monitor- ports allow the response of each photodiode to be observed individually.

Bandwidths of DC - 200 MHz or Lower
Detectors with bandwidths of DC - 200 MHz or lower are available with either Si photodiodes for the 320 - 1000 nm range or InGaAs photodiodes for the 800 - 1700 nm range. Choose from four bandwidths: DC - 15 MHz, DC - 75 MHz, DC - 100 MHz, or DC - 200 MHz. The inputs on these detectors are not fiber-coupled to the photodiodes. Detectors with bandwidths of DC - 100 MHz or lower come with two removable FC input connectors, making them suitable for either free space or fiber-coupled applications. The DC - 200 MHz bandwidth detectors also have FC/PC connectors at the inputs, but they cannot be removed.

Bandwidths of DC - 400 MHz or Higher
Detectors with bandwidths of DC - 400 MHz or higher feature fiber-coupled InGaAs photodiodes connected to FC/APC optical inputs with exactly length-matched SMF-28e+ or HI1060 fiber to achieve excellent CMRR values across the full detector bandwidth. The fiber-coupled design suppresses line artifacts in the OCT image, which generally occur when detector coupling optics are used. The combination of fiber and photodiodes was chosen to optimize these detectors for either 1060 nm (900 - 1400 nm range) or 1300 nm (1200 - 1700 nm range).

Our highest bandwidth detectors are offered in an AC-coupled version only and are the latest design for OCT balanced amplified photodetectors. The PDB480C-AC and PDB481C-AC balanced detectors offer bandwidths from 30 kHz up to 1.6 GHz or 1.0 GHz, respectively, leading to considerable speed improvements. The ultra-low-distortion output stage supports up to a 2 Vp-p A/D card input range, which, combined with the fiber-coupled design, improves the image quality for OCT applications considerably.

Electrical Connections
Three SMA electrical connectors provide the balanced output signal plus a fast power monitor for each of the two input signals for all of the balanced detectors. These two monitors can be used as an independent power meter as well as for measuring low frequency modulated signals up to 1 MHz or 3 MHz, depending on the model chosen (see tables below for details).

Packaging/Power Supply
Housed in a shielded aluminum enclosure measuring 85 mm x 80 mm x 30 mm (3.35" x 3.15" x 1.18"), these detectors are post mountable using the included adapter plate, which can be attached to the bottom or side of the housing with the included 8-32 (M4) screws. The unit is powered with the provided ±12 V DC power supply. The input voltage of 110 V or 230 V can be manually selected by a switch.

A complete list of all of Thorlabs' balanced amplified photodetectors with fast monitor output can be found here. Alternatively, we also offer an APD-based auto-balanced detector with an exceptionally low noise floor suitable for OCT applications with low signal in the sample arm. Thorlabs also offers Fiber-Based Interferometers, which feature an integrated balanced detector.

Item #PDB410APDB410CPDB420APDB420CPDB440APDB440CPDB460APDB460C
Detector TypeSi/PINInGaAs/PINSi/PINInGaAs/PINSi/PINInGaAs/PINSi/PINInGaAs/PIN
Wavelength Range320 - 1000 nm800 - 1700 nm320 - 1000 nm800 - 1700 nm320 - 1000 nm800 - 1700 nm320 - 1000 nm800 - 1700 nm
Typical Max Responsivity0.53 A/W1.0 A/W0.53 A/W1.0 A/W0.53 A/W1.0 A/W0.53 A/W1.0 A/W
Active Detector Diameter0.8 mm0.3 mm0.8 mm0.3 mm0.8 mm0.3 mm0.8 mm0.15 mm
Bandwidth (3 dB)DC - 100 MHzDC - 75 MHzDC - 15 MHzDC - 200 MHz
Common Mode Rejection Ratio>25 dB (Typical >35 dB)>35 dB>35 dB>25 dB (Typical >35 dB)
Transimpedance Gaina50 x 103 V/A250 x 103 V/A51 x 103 V/A30 x 103 V/A
Conversion Gain RF-Output26.5 x 103 V/W50 x 103 V/W133 x 103 V/W250 x 103 V/W27 x 103 V/W51 x 103 V/W16 x 103 V/W30 x 103 V/W
Conversion Gain Monitor Outputs10 V/mW
@ 820 nm
10 V/mW
@ 1550 nm
10 V/mW
@ 820 nm
10 V/mW
@ 1300 nm
10 V/mW
@ 820 nm
10 V/mW
@ 1550 nm
10 V/mW
@ 820 nm
10 V/mW
@ 1550 nm
CW Saturation Power RF-Output135 µW
@ 820 nm
72 µW
@ 1550 nm
27 µW
@ 820 nm
15 µW
@ 1550 nm
130 µW
@ 820 nm
70 µW
@ 1550 nm
225 µW
@ 820 nm
120 µW
@ 1550 nm
Minimum NEP (DC - 10 MHz)7 pW/Hz1/23.8 pW/Hz1/26.5 pW/Hz1/23.5 pW/Hz1/26.4 pW/Hz1/23.3 pW/Hz1/213.2 pW/Hz1/26.0 pW/Hz1/2
Fiber Optical InputsFC/PC or FC/APC
(Removable)
FC/PC or FC/APC
(Not Removable)
Photodiode Damage Threshold20 mW
Electrical OutputsSMA (Qty. 3)
RF-Output Impedance50 W
RF-Output CouplingDC, AC-Coupling upon Request
Dimensions85 mm x 80 mm x 30 mm (3.35" x 3.15" x 1.18")
Power Supply±12 V @ 200 mA
  • Transimpedance Gain is reduced by a factor of two for 50 Ohm loads.
Item #PDB470CaPDB471CaPDB480C-ACaPDB481C-ACa
Detector
Detector TypeInGaAs/PIN
Optical InputsFC/APC
Internal Coupling FiberSMF-28e+HI1060SMF-28e+HI1060
Coupling Loss<0.5 dB (<0.3 dB Typ.)<1.0 dB (<0.4 dB Typ.)<0.5 dB (<0.3 dB Typ.)<1.0 dB (<0.4 dB Typ.)
Operating WavelengthOptimized for 1300 nm
(1200 - 1700 nm Range)
Optimized for 1060 nm
(900 - 1400 nm Range)
Optimized for 1300 nm
(1200 - 1700 nm Range)
Optimized for 1060 nm
(900 - 1400 nm Range)
Typical Max Responsivity0.9 A/W @ 1300 nm0.72 A/W @ 1060 nm0.9 A/W @ 1300 nm0.72 A/W @ 1060 nm
Active Detector Diameter0.075 mm0.080 mm0.075 mm0.080 mm
Optical Back Reflection<-40 dB
Photodiode Damage Threshold10 mW5 mW10 mW5 mW
RF OUTPUT
RF OUTPUT Bandwidth (3 dB)DC - 400 MHz30 kHz - 1.6 GHz30 kHz - 1.0 GHz
Common Mode Rejection Ratio>25 dB (>30 dB Typ.)
RF OUTPUT Transimpedance Gainb10 x 103 V/A16 x 103 V/Ac
RF OUTPUT Conversion Gainb9 x 103 V/W @ 1330 nm7.2 x 103 V/W @ 1060 nm14.4 x 103 V/W @ 1300 nmc11.5 x 103 V/W @ 1060 nmc
RF OUTPUT Power at 1 dB Compressionc-+16.5 dBm Min
+18 dBm Max
RF OUTPUT CW Saturation Power420 µW @ 1300 nm530 µW @ 1060 nm-
RF OUTPUT CouplingDC (AC Coupling Available upon Request)AC Coupling Only
RF OUTPUT Impedance50 Ohms
Minimum NEP8 pW/Hz1/2 (DC to 100 MHz)9.3 pW/Hz1/2 (30 kHz to 100 MHz)9.0 pW/Hz1/2 (30 kHz to 100 MHz)
Overal Output Voltage Noise<2 mVRMS<9 mVRMS<6.5 mVRMS
MONITOR Outputs
MONITOR Output Impedance200 Ohms
MONITOR Output Bandwidth (3 dB)DC - 3 MHz
MONITOR Output Conversion Gain, High Z Loadb9 V/mW @ 1300 nm7.2 V/mW @ 1060 nm9 V/mW @ 1300 nm7.2 V/mW @ 1060 nm
MONITOR Output Voltage Swing, High Z Load10 V Max
Overall Output Voltage Noise<0.65 mVRMS
DC Offset< ±2 mV
General
Electrical OutputsSMA
DC Power Supply±12 V @ 200 mA
Operating Temperature Ranged0 °C to 40 °C
Storage Temperature Range-40 °C to 70 °C
Dimensions (W x H x D)85 mm x 80 mm x 30 mm (3.35" x 3.15" x 1.18")
Weight0.35
  • All technical data are valid at 23 ± 5 °C and 45 ± 15% relative humidity (non-condensing).
  • Values for transimpedance and conversion gain are lossless gain values [i.e. losses introduced by the FC/APC connectors (typically 0.15 to 0.35 dB) are not considered].
  • For a 50 Ohm Load.
  • Non-Condensing.

Operation of the Balanced Detectors with Bandwidths up to 400 MHz

These Balanced Amplified Photodetectors consist of two well-matched photodiodes and an ultra-low noise, high-speed transimpedance amplifier (TIA) that generates an output voltage (RF OUTPUT) proportional to the difference between the photocurrents in the two photodiodes (i.e., the two optical input signals). Additionally, the unit has two fast monitor outputs (MONITOR+ and MONITOR-) to observe the optical input power levels on each photodiode separately. These outputs can be used to measure an RF modulation on the signal up to 1 MHz for versions with a bandwidth of 300 MHz or lower and up to 3 MHz for versions with a bandwidth of DC to 400 MHz.

Balanced receiver

Operation of the PDB480C-AC and PDB481C-AC Balanced Detectors

Similar to the balanced detectors described above, the PDB480C-AC and PDB481C-AC Balanced Amplified Photodetectors consist of two well-matched, fiber-coupled photodiodes connected to the inputs with length-matched fibers and an ultra-low noise, ultra-low distortion high-speed transimpedance amplifier (TIA). Similar to the detectors described above, this TIA generates an output voltage (RF OUTPUT) proportional to the difference between the photocurrent in the two photodiodes (i.e,. the two optical input signals). Additionally, the unit offers two fast monitor outputs (MONITOR+ and MONITOR-) that allow the user to measure the individual optical input power levels as well as low frequency modulated signals up to 3 MHz.

Balanced receiver

RF Output

SMA Female

SMA Female

For the PDB410, PDB420, PDB440, and PDB460 photodetectors, the maximum RF OUTPUT voltage is ±3.6 V for Hi-Z & ±1.8 V into 50 Ω loads.

The RF OUTPUT CW saturation power is 420 µW @ 1300 nm and 530 µW at 1060 nm for the PDB470C and PDB471C, respectively.

For the PDB480 photodetectors, the RF OUTPUT Power at 1 dB compression into 50 Ω loads is +16.5 dBm (Min), +18 dBm (Typical)

Monitor (+/-)

SMA Female

SMA Female

Maximum Voltage is +10 V for Hi-Z & +1.5 V into 50 Ω loads.

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Posted Comments:
Poster: sebastian.marschall
Posted Date: 2013-09-23 13:17:20.217
Hello What is the reason for the different frequency responses of the PDB480C-AC (1.6 GHz) and the PDB481C-AC (1.0 GHz). Would there be big problems when using the PDB480C-AC with 1060 nm light (coupling losses, mode-dispersion, etc.)? Regards, Sebastian
Poster: tschalk
Posted Date: 2013-09-26 06:29:00.0
This is a response from Thomas at Thorlabs. Thank you very much for your inquiry. The bandwidth of the respective detector is defined by the pigtailed diodes built in. Those are designed for a specific wavelength, both because of the fiber used as pigtail as well as for the diode itself. The diode used in the PDB481-AC can unfortunately operate in a stable regime only up to 1GHz. While it would be in principle be possible to use the PDB480C-AC at 1060nm, the diode being not optimized for this wavelength would induce higher losses. The modal dispersion in this case should be negligible considering the short length of the pigtails. I will contact you directly with more detailed information.
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OCT Balanced Detectors with Fast Monitor Output: 320 - 1000 nm
Specificationsa
Item # PDB440A PDB420A PDB410A PDB460A
Wavelength Range 320 - 1000 nm
Detector Type Si/Pin
Typical Max Responsivity 0.53 A/W 0.50 A/W
Active Detector Diameter 0.8 mm 0.4 mm
Bandwidth (3 dB) DC - 15 MHz DC - 75 MHz DC - 100 MHz DC - 200 MHz
Common Mode Rejection Ratio >35 dB >25 dB
(>35 dB Typ.)
Transimpedance Gainb 51 x 103 V/A 250 x 103 V/A 50 x 103 V/A 30 x 103 V/A
Optical Inputs FC/PC or FC/APC
(Removable)
Monitor Output Bandwidth DC - 1 MHz
  • For a full list of specifications, please see the Specs tab above.
  • Transimpedance Gain is reduced by a factor of two for 50 Ohm loads.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
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OCT Balanced Detectors with Fast Monitor Output: 800 - 1700 nm
Specificationsa
Item # PDB440C PDB420C PDB410C PDB460C
Wavelength Range 800 - 1700 nm
Detector Type InGaAs/PIN
Typical Max Responsivity 1.0 A/W
Active Detector Diameter 0.3 mm 0.15 mm
Bandwidth (3 dB) DC - 15 MHz DC - 75 MHz DC - 100 MHz DC - 200 MHz
Common Mode Rejection Ratio >35 dB >25 dB (>35 dB Typ.)
Transimpedance Gainb 51 x 103 V/A 250 x 103 V/A 50 x 103 V/A 30 x 103 V/A
Optical Inputs FC/PC or FC/APC
(Removable)
FC/PC or FC/APC
(Not Removable)
Monitor Output Bandwidth DC - 1 MHz
  • For a full list of specifications, please see the Specs tab above.
  • Transimpedance Gain is reduced by a factor of two for 50 Ohm loads.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
PDB440C Support Documentation
PDB440C Fixed Gain Balanced Amp. Photodetector, 15 MHz, InGaAs
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PDB420C Support Documentation
PDB420C Fixed Gain Balanced Amp. Photodetector, 75 MHz, InGaAs
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PDB410C Support Documentation
PDB410C Customer Inspired! Fixed Gain Balanced Amp. Photodetector, 100 MHz, InGaAs
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PDB460C Support Documentation
PDB460C Customer Inspired! Fixed Gain Balanced Amp. Photodetector, 200 MHz, InGaAs
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OCT Balanced Detectors with Fast Monitor Output: Optimized for 1060 nm
Responsitivity of the Photodiodes in Detectors for 1060 nm
Click to Enlarge
The blue shaded region indicates the specified wavelength range for these balanced detectors. 1060 nm is marked with a vertical blue line.
Specificationsa
Item # PDB471C PDB481C-AC
Operating Wavelength Optimized for 1060 nm
(900 - 1400 nm Range)
Detector Type InGaAs/PIN
Internal Coupling Fiber HI1060
Typical Responsivity 0.72 A/W @ 1060 nm
Active Detector Diameter 0.080 mm
Bandwidth (3 dB) DC - 400 MHz 30 kHz - 1.0 GHz
Common Mode Rejection Ratio >25 dB (>30 dB Typ.)
Transimpedance Gainb 10 x 103 V/A 16 x 103 V/Ac
Optical Inputs FC/APC
Monitor Output Bandwidth DC - 3 MHz
  • For a full list of specifications, please see the Specs tab above.
  • Values for transimpedance gain are lossless gain values [i.e., losses introduced by the FC/APC connectors (typically 0.15 to 0.35 dB) are not considered].
  • For a 50 Ohm load.

All technical data are valid at 23 ± 5°C and 45 ± 15% relative humidity (non-condensing).

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
PDB471C Support Documentation
PDB471C Fiber-Coupled Balanced Amp. Photodetector, 400 MHz, InGaAs
$1,700.00
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PDB481C-AC Support Documentation
PDB481C-AC Fiber-Coupled Balanced Amp. Photodetector, 1.0 GHz, InGaAs, AC Coupled
$1,700.00
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OCT Balanced Detectors with Fast Monitor Output: Optimized for 1300 nm
Responsitivity of the PDB480C-AC Balanced Detector
Click to Enlarge
The blue shaded region indicates the specified wavelength range for these balanced detectors. 1300 nm is marked with a vertical blue line.
Specificationsa
Item # PDB470C PDB480C-AC
Operating Wavelength Optimized for 1300 nm
(1200 - 1700 nm Range)
Detector Type InGaAs/PIN
Internal Coupling Fiber SMF-28e+
Typical Max. Responsivity 0.9 A/W @ 1300 nm
Active Detector Diameter 0.075 mm
Bandwidth (3 dB) DC - 400 MHz 30 kHz - 1.6 GHz
Common Mode Rejection Ratio >25 dB (>30 dB Typ.)
Transimpedance Gainb 10 x 103 V/A 16 x 103 V/Ac
Optical Inputs FC/APC
Monitor Output Bandwidth DC - 3 MHz
  • For a full list of specifications, please see the Specs tab above.
  • Values for transimpedance gain are lossless gain values [i.e., losses introduced by the FC/APC connectors (typically 0.15 to 0.35 dB) are not considered].
  • For a 50 Ohm load.

All technical data are valid at 23 ± 5°C and 45 ± 15% relative humidity (non-condensing).

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal/Imperial Price Available / Ships
PDB470C Support Documentation
PDB470C Customer Inspired! Fiber-Coupled Balanced Amp. Photodetector, 400 MHz, InGaAs
$1,610.00
Today
PDB480C-AC Support Documentation
PDB480C-AC Fiber-Coupled Balanced Amp. Photodetector, 1.6 GHz, InGaAs, AC Coupled
$1,610.00
Today
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