Wavelength detector and method of detecting wavelength of an optical signal

摘要

A wavelength detector is described. The wavelength detector directs an incoming optical signal into two paths, at least one of which varies with wavelength of the optical signal. The light in the two paths is detected by a photodetector and the output electrical signals are log amplified. The log amplified signals are applied to a difference amplifier whose output is indicative of the wavelength of the incident optical signal.