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Polarization Diverse Receivers

Our Polarization Diverse Receivers (PDR) operate at wavelengths of 1060, 1310, or 1550 nm, and mix 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 polarization of the mixed signal are analyzed with a pair of balanced detectors. Our PDR is housed in a compact, hermetically sealed, package with direct electrical connections to its four photodiodes.

A sample and reference signals are first split by a non-polarizing beam-splitter, followed by polarization state splitting by a polarizing beam-splitter. The resulting four channels (S+, S-, P+ and P-) allow polarization diverse detection with common mode rejection.

Wavelength1060±60 nm
1310±60 nm
1550±30 nm
Fiber type (1060/1310 nm)SM, both inputs
Fiber type (1550 nm)PM ref input / SM sample input
Excess loss, sample channels0.5 dB
Photodiode responsivity¹ (1060 nm)0.73 dB
Photodiode responsivity¹ (1310 nm)0.9 dB
Photodiode responsivity¹ (1550 nm)0.95 dB
Balanced Pair CMRR35 dB
Return Loss25 dB
OPD between channel pair<2 mm
Polarization extinction ratio>25 dB
Interference fringe visibility with 50/50 input²90%
Detector linearity/saturation³>5 mW
Detector 3 dB bandwidth⁴>1.75 GHz
Detector capacitance<0.65 pF
Detector reverse voltage<20 V
Dark current at 5 V reverse bias0.03 nA
Detector reverse current<1 mA
Detector forward current<5 mA
Fiber pigtail sleeving and length900 μm loose tube sleeving, >1 m
Dimensions51.0 mm x 30.5 mm x 10.1 m

¹InGaAs photodiode

²Equal magnitude optical signals fed to reference and signal inputs.

³Optical power per photodiode under 5 V reverse bias.

⁴5 V reverse bias into 50 ohm

For any more information on Polarization Diverse Receivers, please don't hesitate to get in touch.

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