All-optical two-channel polarization-multiplexing format conversion from QPSK to BPSK signals in a silicon waveguide

(整期优先)网络出版时间:2016-06-16
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All-opticaltwo-channelformatconversionisproposedandexperimentallydemonstratedfroma40Gbit/spolarizationmultiplexing(Pol-MUX)non-return-to-zeroquadraturephase-shiftkeying(QPSK)signaltoPol-MUXbinaryphase-shiftkeying(BPSK)signalsbyusingphase-doubledfour-wavemixingeffectswithtwopolarization-angledpumpsinasiliconwaveguide.TheeyediagramsandconstellationdiagramsoftheoriginalQPSKsequencesandtheconvertedBPSKsequencesofeachchannelareclearlyobservedonthetwopolarizationstates.Moreover,thebiterrorrates(BERs)ofthetwoconvertedidlersaremeasured.ThepowerpenaltiesofalltheseconvertedBPSKsequencesonbothXandYpolarizationstatesarelessthan3.4dBataBERof3.8×10-3.