Patent ID: 6897948

Claim:
A variable-wavelength light source apparatus for generating a measurement optical signal from a measurement light source and outputting the optical signal to an optical device, said variable-wavelength light source apparatus comprising: a light branching unit for branching the measurement optical signal to a plurality of optical signals and outputting the plurality of optical signals to predetermined output terminals; a light reflection signal output unit for outputting a light reflection signal input from the optical device to a predetermined output terminal; a first light reception device for receiving branch light output by said light branch unit to convert the branch signal into an electric signal; and a second light reception device for receiving the light reflection signal output by said light reflection signal output unit to convert the light reflection signal into an electric signals; wherein the optical device is one of a measured optical part and a wavelength calibration gas cell connected to a total reflection termination; and wherein a wavelength of the measurement optical signal output from the measurement light source is calibrated using the wavelength calibration gas cell connected to the total reflection termination.