Multi-channel optical transceiver with offset quadrature amplitude modulation

摘要

The present disclosure provides a multi-carrier optical transmitter, receiver, transceiver, and associated methods utilizing offset quadrature amplitude modulation thereby achieving significant increases in spectral efficiency, with negligible sensitivity penalties. In an exemplary embodiment, an optical transmitter includes circuitry configured to generate a plurality of optical subcarriers, a plurality of data signals for each of the plurality of subcarriers, and a plurality of modulator circuits for each of the plurality of subcarriers, wherein each of the plurality of modulator circuits includes circuitry configured to offset an in-phase component from a quadrature component of one of the plurality data signals by one-half baud period.

主权项

1. An optical receiver, comprising:
a splitter configured to split a received optical signal into N copies where N comprises a number of subcarriers; a polarization splitter for each of the N copies configured to split the received optical signal into two polarizations; a coherent optical hybrid for each of the N copies configured to receive the two polarizations of the received optical signal and an output from a local oscillator for each of the N copies, wherein the local oscillator comprises a frequency tuned substantially to match a corresponding subcarrier frequency; a postfilter located subsequent to the coherent optical hybrid configured to reject, for each of the N copies, adjacent subcarriers and adjacent symbols based on which copy of the N copies is being addressed and the postfilter configured to implement pulse-shape filtering complementary to transmitter pulse-shaping and to provide chromatic dispersion compensation; and a data decoder.