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Compact 400 MHz Balanced Amplified Photodetector


  • Balanced Receiver with a Compact Footprint
  • Noise Cancellation by Subtraction of 2 Input Signals
  • >25 dB Common Mode Rejection Ratio
  • Volume Pricing Available for OEMs
  • Customization Options Available

PDB770C

Balanced Amplified Detector with FC/APC Connectors

100.0 mm
(3.93")

80.0 mm
(3.15")

PDBEVAL1

Evaluation Board for the PDB770C Detector

Application Idea

The PDB770C Balanced Detector soldered to the PDBEVAL1 Evaluation Board. An ADAFCB4 Fiber Bracket (not included) is used to hold the detector's FC/APC connectors. 

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Applications

  • OEM Balanced, Amplified Detection
  • LIDAR Systems
  • OCT Systems
  • Optical Frequency Domain Reflectometry

Features

  • 400 MHz InGaAs Balanced Photodetector
  • Wavelength Range: 950 nm to 1650 nm
  • Surface Mount Component (Solders Directly to PCB)
  • Small Footprint: 45.0 mm x 25.0 mm x 7.0 mm
  • Evaluation Board with SMA Outputs Available
  • FC/APC-Terminated Versions Available from Stock
  • Bandwidth, Gain, and Connector Type Customization Options Available; Contact Tech Support for Details

Thorlabs' PDB770C Compact Balanced Amplified Photodetector is a high-speed InGaAs detector with a small footprint specifically designed for OEM applications. This compact balanced detector provides a frequency response bandwidth of DC to 400 MHz and includes SMF-28 Ultra fiber leads for single-mode applications in the 950 nm to 1650 nm wavelength range. With a common mode rejection ratio (CMRR) of >25 dB, this detector is ideal for techniques requiring high sensitivity, such as LIDAR, OCT, and optical frequency domain reflectometry. For more performance details, see the Graphs tab.

The PDB770C detector consists of two well-matched photodiodes and an ultra-low-noise, ultra-low-distortion, high-speed transimpedance amplifier. To act as a balanced receiver, this compact detector subtracts the two optical input signals from each other, which results in the cancellation of common mode noise. This allows small changes in the signal path to be extracted from the interfering noise floor. The unit also includes two monitor outputs for measuring the individual optical input power levels, as well as low-frequency modulated signals up to 150 kHz. Please see the Operation tab for more details.

This compact balanced detector has SMF-28 Ultra fiber leads with Ø900 µm buffer jackets; note that one photodiode has a yellow buffer and the second has white for easy identification. The two fibers in this detector are 50 cm long and matched in length to <1 mm (with connectors), which ensures the equal optical path lengths needed for common mode noise suppression. This detector is available from stock with narrow key FC/APC connectors. Units with alternate connectors are available by contacting Tech Support.

Mounting and External Connection
We also offer an evaluation board for mounting and accessing the output signals from the PDB770C detector. This board features a pre-defined footprint for soldering the detector in place, SMA connectors for signal output, and connections for a power supply. Included with each PDBEVAL1 board is a RKMF3 connector cable for connecting the Thorlabs LDS12B ±12 VDC Power Supply (not included). Alternatively, this package can be soldered to a custom PCB; please see the Pin Diagrams tab for more information about the external pin connections. Please refer to the PDB770C detector spec sheet for complete instructions on connecting and operating the detector.

Please note that the components inside this module are ESD sensitive. Take all appropriate precautions to discharge personnel and equipment before making any electrical connections to the unit. All soldering must be done by hand; a reflow oven will damage the device.

Packaged Balanced Amplified Photodetectors
Thorlabs also offers balanced amplified photodetectors with fast monitor outputs in shielded aluminum enclosures for an out-of-the-box detection solution. With a DC to 400 MHz bandwidth and an InGaAs detector, the PDB470C Fiber-Coupled Balanced Amplifier most resembles the performance of the PDB770C detector.

PDB770C OEM Balanced Amplified Detector

General Specificationsa
Coupling Loss <0.5 dB (Max)
<0.3 dB (Typ.)
Operating Wavelength 950 - 1650 nm
(Optimized for 1300 nm)
Typical Max Responsivity 0.85 A/W at 1300 nm
RF Output Specifications
RF Output Bandwidth (3 dB) DC - 400 MHz
Common Mode Rejection Ratio >25 dB
RF Output Transimpedance Gainb 10 x 103 V/A
RF Output Conversion Gainb 8.5 x 103 V/W at 1300 nm
CW Saturation Power 440 μW at 1300 nm
Minimum NEPc 8 pW/Hz1/2 (DC to 100 MHz)
RF Output Voltage Swing ±3.8 V (High Z)
±1.9 V (50 Ω)
Overall Output Voltage Noise <2.6 mVRMS
DC Offset <±2 mV
Monitor Outputs
Monitor Output Impedance 200 Ω
Monitor Output Bandwidth (3 dB) DC - 150 kHz
Monitor Output Conversion Gainb 8.5 V/mW at 1300 nm (High Z)
Monitor Output Voltage Swing 10 V (Max) (High Z)
Overall Output Voltage Noise <0.65 mVRMS
DC Offset <±2 mV
  • All technical data are valid at 23 ± 5 °C and 45 ± 15% rel. humidity (non-condensing).
  • Values do not consider losses introduced by the FC/APC connectors (typically 0.15 to 0.35 dB). Values are given for high-impedance load. For a 50 Ω load, divide the value by 2.
  • For more information on NEP, please see Thorlabs' Noise Equivalent Power White Paper.
Absolute Maximum Specificationsa
Photodiode Damage Threshold 10 mW
  • All technical data are valid at 23 ± 5 °C and 45 ± 15% rel. humidity (non-condensing).
Mechanical Specificationsa
Detector Type InGaAs
Optical Input Connectors 2.0 mm Narrow Key FC/APC
Electrical Outputs Solderable Half-Vias
Fiber Length and Match 50 ± 10 cm
Length Matched to <1 mm (With Connectors)
Fiber Buffer Ø900 µm
Yellow on PD1, White on PD2
Fiber Type SMF-28 Ultra
Fiber Bend Radius 15 mm (Min)
Dimensions (W x H x D) 45.0 mm x 25.0 mm x 7.0 mm
(1.77" x 0.99" x 0.28")
Weight 0.02 kg
  • All technical data are valid at 23 ± 5 °C and 45 ± 15% rel. humidity (non-condensing).
Operating Conditionsa
Operating Voltageb ±9 V to ±12 V
Quiescent Current ±50 mA
Full Load Current ±150 mA
Operating Temperature Rangec 0 - 40 °C
Storage Temperature Range -40 to 70 °C
  • All technical data are valid at 23 ± 5 °C and 45 ± 15% rel. humidity (non-condensing).
  • The LDS12B ±12 VDC Power Supply is compatible with these detectors.
  • Non-condensing

PDBEVAL1 Evaluation Board

General Specifications
Mounting Holes Ø3.2 mm for 3 mm Screws (4 Places)
Power Supply Voltage ±(12 V ± 10%)
Power Supply Current ±50 mA (Typ.)
±200 mA (Max)
Dependent on Used PDB Module
RF Connectors SMA up to 5 GHz
RF Output Voltage Swing Dependent on Used PDB Module, ±4 V (Max)
Monitor Voltage Swing Dependent on Used PDB Module, ±10 V (Max)
Operating Temperature 0 to 40 °C
Storage Temperature -40 to 70 °C
Dimensions (W x H x D) 112.6 mm x 80.0 mm x 13.6 mm
(4.43" x 3.15" x 0.53")
Weight 37 g

Performance Graphs

PDB770C Frequency Response
Click to Enlarge

Click for Raw Data
Typical frequency response and the common mode rejection ratio (CMRR) for the PDB770C balanced amplified detector.
PDB770C Spectral Response
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Click for Raw Data
Typical responsivity for the PDB770C balanced amplified detector. The shaded region indicates the specified wavelength range for the detector.
Evaluation Board Connections
Click to Enlarge
External Pin Connections for the PDB770C Balanced Detector

Pin Description Pin Description
1 Ground 10 Ground
2 Ground 11 Ground
3 Ground 12 Ground
4 Ground 13 Power Supply (-12 V)
5 Output (Monitor +) 14 Power Supply (+12 V)
6 Ground 15 Ground
7 Ground 16 Output (Monitor -)
8 Ground 17 Ground
9 RF Output 18 Ground

Operation

Thorlabs' Balanced Amplified Photodetector consists 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 150 kHz monitor outputs (MONITOR+ and MONITOR-) to observe the optical input power levels at each photodiode separately. These outputs are low-frequency outputs and cannot be used to measure an RF modulation on the signal.

Balanced receiver

PDB770C Dimensions Bottom
Click to Enlarge
Dimensions for the bottom view of the PDB770C Balanced Amplified Detector
PDB770C Dimensions Top
Click to Enlarge
Dimensions for the top view of the PDB770C Balanced Amplified Detector.

Posted Comments:
user  (posted 2020-08-29 00:05:36.357)
Hi, I want to know the damage threshold of PDB770C photo-detector under a pulsed 300fs laser? What is the rough max power or single pulse energy I can apply to this detector? Thanks a lot!
dpossin  (posted 2020-09-01 07:04:02.0)
Dear Customer, Thank you for your feedback! If the PDB770C is suitable for the laser depends on the repetition rate and pulse length. The saturation limit is 440 µW @ 1300nm. I am reaching out to you in order to check with you your laser properties.

400 MHz Balanced Amplified Photodetector

Key Specsa,b
Item # Typ. Max Responsivity Bandwidth
(3 dB)
CMRRc Transimpedance
Gain
Monitor Output Bandwidth Fiber
Connector
Wavelength Range  Fiber Type
PDB770C 0.85 A/W at 1300 nm DC - 400 MHz >25 dB 10 x 103 V/A DC - 150 kHz 2.0 mm Narrow
Key FC/APC
950 - 1650 nm SMF-28 Ultra
  • For complete specifications, please see the Specs tab.
  • All specifications are valid at 23 ± 5 °C and 45 ± 15% rel. humidity (non-condensing).
  • Common Mode Rejection Ratio
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
PDB770C Support Documentation
PDB770CNEW!400 MHz Balanced Amplified Detector, 950 - 1650 nm, FC/APC
$946.10
Volume Pricing
Today

Evaluation Board for 400 MHz Balanced Detector

Evaluation Board Connections
Click to Enlarge
A PDB770C balanced amplified detector soldered to a PDBEVAL1 evaluation board. An ADAFCB4 fiber bracket and two plastic clamps are used to mount the fibers.
Evaluation Board Top View
Click to Enlarge
Top View of the PDBEVAL1 Evaluation Board
  • Printed Circuit Board (PCB) for Mounting the PDB770C Detector
  • SMA Connectors with Output and Monitor Signals
  • Includes RKMF3 Cable for Connection to Power Supply
  • Footprint: 112.6 mm x 80.0 mm x 13.6 mm

The PDBEVAL1 Evaluation Board allows the user to solder the PDB770C detector in place so that power and output connections can be made with common cables and connectors. The half-via contacts around the perimeter of the detector can be soldered to the pre-defined contact points on the evaluation board. The board also features three SMA connectors for the monitor and output signals, as well as a screw terminal block and power cable connector for the power supply. The evaluation board also has a slot for an optional ADAFCB4 fiber mounting bracket.

Included with each evaluation board is an RKMF3 connector cable for connecting the Thorlabs LDS12B Power Supply (not included) and two plastic clamps for fiber mounting. Please refer to the PDBEVAL1 spec sheet for complete instructions on connecting and operating a PDBEVAL1 Evaluation Board.

The components inside the PDB770C module are ESD sensitive. Take all appropriate precautions to discharge personnel and equipment before making any electrical connections to the unit. All soldering must be done by hand; a reflow oven will damage the device.

Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Universal Price Available
PDBEVAL1 Support Documentation
PDBEVAL1NEW!Evaluation Board for PDB770C Balanced Detector
$157.00
Today
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