Patent ID: 8428468

Claim:
A polarization multiplexing optical transmission system, comprising: a polarization multiplexing optical transmitter; a polarization multiplexing optical receiver; and an optical transmission path connecting the polarization multiplexing optical transmitter and the polarization multiplexing optical receiver; wherein the polarization multiplexing optical transmitter includes a pair of identifier adding units adding identifiers to a first input signal and a second input signal, respectively, so as to differentiate between the first input signal and the second input signal; a pair of modulator units modulating a first polarization light and a second polarization light according to the first input signal and the second input signal, respectively, and outputting a first polarized transmission light and a second polarized transmission light, respectively; and a polarization multiplexing unit multiplexing the first polarized transmission light and the second polarized transmission light, and transmitting a polarization multiplexed light obtained thereby to the optical transmission path; and wherein the polarization multiplexing optical receiver includes a polarization splitting unit splitting the polarization multiplexed light received through the optical transmission path into a first polarized received light and a second polarized received light; a pair of photoelectric conversion units converting the first polarized received light and the second polarized received light into respective electric signals and outputting a first received signal and a second received signal; a demodulation unit performing symbol recognition about the first received signal and the second received signal, and outputting a first demodulated signal and a second demodulated signal; an identifier detecting unit detecting the identifiers from the first demodulated signal and the second demodulated signal; and a delay compensation unit calculating a delay difference between the first demodulated signal and the second demodulated signal based on the identifiers, and inserting delay time corresponding to the delay difference into the first demodulated signal or the second demodulated signal.