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.
| Parameter | Value |
|---|---|
| Wavelength | 1060±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 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 |
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
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