Patent ID: 7602322
Filing Date: 2009-10-13
Classification: H03M,H04B,H04L

Abstract:
1. An analog-to-digital (AD) conversion controller that controls, in an optical receiving device receiving optical signals of which an optical intensity waveform of each symbol is a return-to-zero (RZ) pulse, an AD converter that converts received signals into digital signals by AD conversion at a predetermined sampling timing, the AD conversion controller comprising: a sampling timing pulse source that generates a pulse regulating the predetermined sampling timing and electrically controls a phase of the pulse; an error estimator that estimates sampling timing errors of the AD conversion of the digital signals based on a result of the AD conversion by the AD converter; a control-value calculating unit that calculates a control value for controlling the phase of the sampling timing pulse source based on the sampling timing errors estimated by the error estimator; and a compensator that performs feedback compensation of the phase of the pulse regulating the predetermined sampling timing based on the control value calculated by the control-value calculating unit.