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.
|Fiber type (1060/1310 nm)||SM, both inputs|
|Fiber type (1550 nm)||PM ref input / SM sample input|
|Excess loss, sample channels||0.5 dB|
|Photodiode responsivity¹ (1060 nm)||0.73 dB|
|Photodiode responsivity¹ (1310 nm)||0.9 dB|
|Photodiode responsivity¹ (1550 nm)||0.95 dB|
|Balanced Pair CMRR||35 dB|
|Return Loss||25 dB|
|OPD between channel pair||<2 mm|
|Polarization extinction ratio||>25 dB|
|Interference fringe visibility with 50/50 input²||90%|
|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 bias||0.03 nA|
|Detector reverse current||<1 mA|
|Detector forward current||<5 mA|
|Fiber pigtail sleeving and length||900 μm loose tube sleeving, >1 m|
|Dimensions||51.0 mm x 30.5 mm x 10.1 m|
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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