Wavelength tunable filter apparatus

摘要

The apparatus has: a wavelength tunable filter 1; a photoelectric conversion part 2 which converts transmitted light received from the wavelength tunable filter 1 into a received light intensity signal; a received light intensity detecting part 3 which detects the intensity of the received light intensity signal; a signal component detecting part 8 which detects a signal component from the received light intensity signal; a signal intensity detecting part 9 which detects the intensity of the signal component; an intensity variation detecting part 4 which detects an intensity variation in the received light intensity signal which is detected and an intensity variation in the signal component; and a peak position detecting part 5 and a wavelength scanning part 6 which scan and a wavelength to be selected by the wavelength tunable filter 1 based on the two detected variations.