Patent ID: 7986886

Claim:
An optical signal detector for monitoring an optical source that provides an optical signal in at least one of a plurality of bands that is transmission bands of a wavelength-division-multiplexed optical signal, the optical signal detector comprising: a primary optical sensor for detecting power of an optical signal incident from the optical source; a plurality of secondary optical sensors for detecting respective optical signals corresponding to respective preset bands; a signal conversion unit for converting signals, detected by the primary optical sensor and the secondary optical sensors, into a processable form; a wavelength determination unit for determining a peak wavelength of the optical source based on a number of operating secondary optical sensors among the secondary optical sensors; a power measurement unit for measuring power of an optical signal corresponding to the peak wavelength based on the signal detected by the primary optical sensor; and an output at which at least one of the peak wavelength and the measured power corresponding to the peak wavelength is provided.