Patent ID: 8705987
Filing Date: 2014-04-22
Classification: H04B,H04J

Abstract:
1. A signal processing circuit, comprising: an optical frequency deviation estimating unit an optical frequency deviation compensation amount analyzing unit that calculates an amount of frequency compensation which is an amount of compensation to make a phase of the signal data rotated so as to reduce the frequency deviation, on the basis of a plurality of the estimated values estimated per the signal data; an optical frequency deviation compensating unit that makes the phase of the signal data rotated correspondingly to the amount of the frequency compensation; an optical phase deviation estimating unit that estimates a phase deviation included in each the input signal data and is a difference between a phase of the optical carrier wave and a phase of the local light, per the signal data; and an optical phase deviation compensating unit that makes the phase of the signal data rotated correspondingly to the phase deviation.