***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST***Coherent optical receiver

摘要: A coherent optical receiver of the invention combines local oscillator light having orthogonal polarization components in which frequencies are different to each other, and received signal light, an hybrid circuit, then photoelectrically converts this two differential photodetectors. Then is converted a digital AD conversion computation processing executed computing circuit using signal, estimate data. At time, frequency difference between set so as be smaller than times band width, larger spectrum line width source source. As result, it possible realize small size independent that capable receiving high speed light.