Polarization diversity optical receiver for coherent optical communication

Abstract From the Canadian patent

Disclosed is a polarized wave diversity optical receiver for coherent optical communication comprising: an optical local oscillating circuit (7) for oscillating local oscillating light; a mixing circuit (8) for mixing signal light and the local oscillating light to obtain two polarized components; a detecting circuit (9) for detecting the polarized components to output intermediate frequency signals (eS and ep); and a frequency control circuit (11) for controlling, in accordance with the intermediate frequency signals (eS and ep) the, oscillating frequency of the optical local oscillating circuit (7). To ensure that the intermediate frequency is not disappeared, the frequency control …