METHOD FOR CONTROLLING OPTICAL GAIN DIFFERENCE AND OPTICAL PHASE DIFFERENCE, METHOD FOR CONTROLLING OPTICAL GAIN DIFFERENCE AND METHOD FOR CONTROLLING OPTICAL PHASE DIFFERENCE OF SOA-MZI WAVELENGTH CONVERTER, AND APPARATUSES THEREFOR

摘要

A method and apparatus for controlling an optical gain difference and an optical phase difference in a semiconductor optical amplifier-Mach-Zehnder interferometer (SOA-MZI) wavelength converter having two arms and that outputs probe output signals PSUBOH /SUBand PSUBOL/SUB, corresponding to pump input signals of logic high and logic low, respectively. The controlling includes detecting an optical power level of the output probe signals and controlling at least one of an optical gain difference between the two arms and an optical phase difference between the two arms in accordance with a detected optical power level of the probe output signal.