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A centralized polarization scrambling and single-PD coherent ONU Rx system is proposed and tested with two Tx and direct-phase modulated DFBs. Polarization independence at the Rx, and a sensitivity at BER=10−3 of ×45dBm with 7.5GHz channel spacing were achieved.
Wavelength shifting based on the all-optical clock recovery of a RZ-downstream with suppressed clock harmonic is presented, avoiding in-band Rayleigh backscattering for choosing this particular harmonic as upstream carrier, even for a low OSRR <10dB.
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