Monitor circuit for monitoring property of optical fiber transmission line and quality of optical signal

摘要

An optical receiver, comprises an optical reception circuit 10 adapted to perform coherent reception of an optical signal; a digital equalization filter 21 adapted to generate equalized complex electric field data by filter computation to equalize the optical signal, according to complex electric field data of the optical signal, which is obtained with the coherent reception; and a quality calculating unit 24 adapted to calculate a quality of the optical signal on the basis of the equalized complex electric field data.