Patent ID: 8417126

Claim:
A polarization multiplexing transmitter comprising: an orthogonal polarization multiplexing transmitter including: an orthogonally polarized signal generator which generates two transmission electric fields with mutually orthogonal polarized waves; two electric field modulators which modulate amplitudes and/or phases of the two transmission electric fields respectively; and a polarization multiplexer which multiplexes two transmission electric field signals modulated by the two electric field modulators and outputs a single polarization-multiplexed signal; a polarization-rotated electric field generator which outputs, for a plurality of data strings, a plurality of polarization-rotated electric field signals having data on different polarized waves rotating on a Poincare sphere and electric field data corresponding to the data strings; and an electric field modulator driver which multiplexes the polarization-rotated electric field signals into a single multiplexed polarized electric field signal, demultiplexes the multiplexed polarized electric field signal into polarized wave components of the two transmission electric fields generated by the orthogonally polarized signal generator and outputs two polarized demultiplexed electric field signals, and drives the two electric field modulators based on the two polarized demultiplexed electric field signals respectively.