MONITOR CIRCUIT FOR MONITORING PROPERTY OF OPTICAL FIBER TRANSMISSION LINE AND QUALITY OF OPTICAL SIGNAL, AND PHOTORECEIVER

摘要

PROBLEM TO BE SOLVED: To downsize and/or reduce a cost of a monitor circuit for monitoring a property of an optical fiber transmission line and quality of an optical signal.

SOLUTION: An optical reception circuit 10 generates optical electric field data by performing coherent reception of an optical signal transmitted via an optical fiber transmission line. An FIR filter 21 filters the optical electric field data so that the optical signal is equalized. A quality monitor unit 24 calculates an average value and a standard deviation value of amplitude of the optical signal on the basis of the equalized optical electric field data, and further calculates optical signal-to-noise ratio on the basis of the calculated values.

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