Apparatus and method for monitoring a wavelength tunable optical filter

摘要

Amonitoring apparatus, that monitors a wavelength tunable optical filter for filtering an optical signal to which a frequency modulation component is added, includes: an optical filter (61b) configured to filter the optical signal output from the wavelength tunable optical filter; a detector (63b) configured to detect amplitude of the frequency modulation component included in the optical signal output from the optical filter; a generator (64) configured to generate an output-side amplitude distribution representing a distribution of the amplitude of the frequency modulation component detected by the detector, by sweeping a transmission wavelength of the optical filter; and a monitoring unit (65) configured to monitor arrangement of a transmission wavelength band of the wavelength tunable optical filter with respect to a spectrum of the optical signal based on the output-side amplitude distribution generated by the generator.