Patent ID: 8190032
Filing Date: 2012-05-29
Classification: H04B,H04J

Abstract:
1. An optical signal processing apparatus comprising: an O/E conversion element for converting an NRZ optical signal into an electric signal; a recovery circuit for recovering a clock signal from the electric signal obtained by the O/E conversion element; a phase modulator for applying phase modulation to the NRZ optical signal, using the clock signal obtained by the recovery circuit; an intensity modulator for applying intensity modulation to an optical signal obtained by the phase modulator, using the clock signal obtained by the recovery circuit; a dispersion medium that passes an optical signal obtained by the intensity modulator, wherein the recovery circuit recovers and outputs a sine wave signal as a clock signal having a frequency corresponding to a bit rate of the NRZ optical signal, and the phase modulator applies phase modulation to the NRZ optical signal using the clock signal adjusted so that a local minimum or a peak of a voltage of the clock signal is positioned, in a time domain, in a middle or approximately in the middle of each bit of the NRZ optical signal.