A green printed circuit board labeled "G&H Compact PDR Driver" with various electronic components, connectors, and a centrally mounted gold-colored G&H PDR module (serial number 02672795). Two fiber optic cables are connected to the module's labeled ports "R" and "S", and multiple gold SMA connectors are visible along the edge of the PCB. The entire assembly rests on a black grooved surface.

Polarization Diverse Receiver (PDR) Mounted on Balanced Detector Interface PCB

The G&H PDR is housed in a compact, hermetically sealed package with direct electrical connections to its four photodiodes and mounted on to a balanced detector PCB.

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Product description

G&H specialize in providing optical components for high performance measurement and instrumentation systems.

G&H’s Polarisation Diverse Receiver (PDR) mixes an incoming signal with a reference (local oscillator), thereby shifting any phase and amplitude fluctuations on the optical carrier to a carrier at an electronic frequency. The S and P states of polarisation of the mixed signal are analysed with a pair of balanced detectors.

Balanced detector interface PCB for PDR - The circuit design is a dual-balanced receiver circuit, giving a balanced output signal for two pairs of photodiodes.

Applications

Optical Coherence Tomography (OCT)
Fiber sensing
Lidar
Instrumentation

Key features

Polarization-dependent balanced detection
Supports 1060 nm, 1310 nm and 1550 nm PDR variants
Noise filtering for maximum image quality
High common mode rejection
Easily connected to facilitate evaluation and use

Specifications

	1060	1310	1550
Wavelength	1060 nm	1310 nm	1550 nm
Fiber type	Singlemode, HI1060, both inputs	Singlemode, SMF-28, both inputs	PM Reference input / SMF-28 Sample input
Excess loss, sample channels	0.5 dB	0.5 dB	0.5 dB
Photodiode responsivity	0.73 A/W	0.90 A/W	0.95 A/W
Balanced pair CMRR	35 dB	35 dB	35 dB
Return loss	25 dB	25 dB	25 dB
OPD between channel pairs	<2 mm	<2 mm	<2 mm
Polarization Extinction Ratio (PER)	>25 dB	>25 dB	>25 dB
Interference fringe visibility with 50/50 input	>90 %	>90 %	>90 %
Detector linearity/saturation	>5 mW	>5 mW	>5 mW
Detector 3 dB bandwidth	>1.75 GHz	>1.75 GHz	>1.75 GHz
Detector capacitance	<0.65 pF	<0.65 pF	<0.65 pF
Detector reverse voltage	<20 V	<20 V	<20 V
Dark current at 5 V reverse bias	0.03 nA	0.03 nA	0.03 nA
Detector reverse current	<1 mA	<1 mA	<1 mA
Detector forward current	<5 mA	<5 mA	<5 mA
Fiber pigtail sleeving and length	900 µm loose tube sleeving, >1 m	900 µm loose tube sleeving, >1 m	900 µm loose tube sleeving, >1 m
Dimensions	51.0 mm x 30.5 mm x 10.1 mm	51.0 mm x 30.5 mm x 10.1 mm	51.0 mm x 30.5 mm x 10.1 mm