WAVELENGTH LOCKING STRUCTURE OF TUNABLE LASER AND WAVELENGTH LOCKING METHOD OF TUNABLE LASER

The present invention relates to a wavelength locking structure for a tunable laser which is small and economical in comparison to the related art, and a wavelength locking method for a tunable laser. The wavelength locking structure for a tunable laser according to the present invention includes: a tunable laser 100; a light separator 200 into which light emitted from the tunable laser 100 travels and that separates the light into transmitted light A and reflected light B; an etalon filter 300 that transmits the reflected light B in a predetermined wavelength band; a light receiver 400 that converts light that transmits the etalon filter 300 into an electrical signal; and a controller 500 that periodically changes the wavelength of light emitted from the tunable laser 100 using the electrical signal converted by the light receiver 400 so that a wavelength at which the quantity of light that transmits the etalon filter 300 is maximum, is included.