PMD compensation in a 2 40Gbit/s, 212km, CS-RZ polarization multiplexed transmission experiment

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1 Universität Paderborn PMD compensation in a 2 40Gbit/s, 212km, CS-RZ polarization multiplexed transmission experiment D. Sandel, F. Wüst, V. Mirvoda, Electrical Engineering and Information Technology Universität Paderborn Paderborn, Germany Acknowledgements: Siemens ICN, Deutsche Forschungsgemeinschaft

2 Motivation Polarization division multiplex (PolDM) is attractive to double fiber capacity. DEMUX at the RX side requires endless polarization control. Referred to the same per-channel bit rate PolDM tolerates less PMD than standard transmission. PMD compensation is also required. No extra optics or high-frequency electronics should be needed to generate error signals.

3 Interference and RZ arrival time variation in the presence of interchannel phase modulation E y E y 01 mixed fast 11 Interference mixed polarizer E x 10 E x 10 Polarization mismatch 11 PMD slow 11

4 Experimental setup FM nm nm 33km DSF 15km SSMF DCF CS-RZ 20GHz MOD 40Gbit/s 63km SSMF MUX 51km DSF M 50km DSF Motorized endless polarization transformer M polarization & PMD controller PT PMF PT arrival time interference POL VCO decision circuitry PI data out

5 Bessel spectrum in control receiver Even vs. odd Bessel line 5 db / div powers fluctuate as function of mean interchannel phase worst case difference. J2, J3, J4 are detected. Suitable power weighting makes signal independent of phase fluctuations and, to first order, of differential polarization control on phase modulation index MHz η π f τ 4.2 J1 J2 J3 J4 J5 ~ peak peak = 240MHz 5.6ns

6 rms arrival time variation tˆrms vs. DGD [ps] 10 2 A.U DGD [ps] DGD [ps] sensitivity 150fs, measured in 4.8µs

7 RZ PolDM eye diagrams with 212km of fiber back-to-back after 212km, 4ps in compensator after 212km, without PMD compensation

8 RZ PolDM eye diagrams with PMD emulator 5.5ps in emulator, 5.5ps in compensator same as left side but without PMD compensation

9 Prescaled clock spectra with PMD emulator P/dBm P/dBm f [MHz] f [ MHz] 5.5ps in emulator, 5.5ps in compensator ~0.5ps residual PMD same as left side but without PMD compensation

10 Results 212km, 4ps in PMD compensator: Error-free transmission over 212km in both polarization channels over 1 hour, in the presence of endless polarization changes of ~0.4rad/s Additional finite polarization changes tolerable (stepper motor vibrations, manual fiber handling) PMD emulator, 5.5ps in PMD compensator: 0, 2, 4, 5.5 and 6ps of DGD tolerated error-free, including endless polarization changes Without PMD compensation transmission was error-free for 0 and 2ps, but not for 4ps.

11 Effects on RZ PolDM signals in the presence of interchannel phase modulation Polarization mismatch PMD

12 Summary 2 40Gbit/s CS-RZ polarization division multiplex transmission 212km of DSF + SSMF (+ DCF) Endless polarization control using interference detection scheme PMD compensation using arrival time detection scheme

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