Wavelength locker structure for tunable laser and wavelength locking method for tunable laser

摘要

The present invention relates to a wavelength locking structure of a tunable laser and a wavelength locking method of a wavelength tunable laser, which are downsized and economical compared with the conventional method. The wavelength locking structure of the tunable laser according to the present invention is a wavelength tunable laser, An optical isolator 200 for receiving the light emitted from the tunable laser 100 and splitting the light into transmitted light A and reflected light B and an etalon 200 transmitting the reflected light B in a predetermined wavelength band, A filter 300, an optical receiving element 400 for converting the light transmitted through the etalon filter 300 into an electrical signal, and an electrical signal converted from the optical receiving element 400, And a control unit 500 for periodically changing a wavelength of light emitted from the tunable laser 100 such that a wavelength at which a light amount of the light transmitted through the wavelength tunable laser 300 is maximum is included.