| 摘要 |
PURPOSE:To obtain an accurate output wavelength of each wavelength converter by providing a reference signal generator that outputs light signals of plural kinds of wavelength and supplying the output signals to each wavelength converter. CONSTITUTION:Wavelength multiplex output light signals including direct current light of wavelength lambda1-lambda4 of a reference light generator 121 are branched by a light branching device 128 and applied to an optical waveguide 200. Direct current light of wavelength lambda1 is selected from the reference light by a wavelength selecting element 201 and supplied to a wavelength converter 206. The wavelength converter 206 changes wavelength of light signals from the wavelength selecting element 701 to make the output wavelength equal to direct current light of wavelength lambda1 from the wavelength selecting element 201. Direct current light of wavelength lambda2, lambda3, lambda4 is supplied also to wavelength converter 207, 208, 209, and each wave changing switch 207, 208, 209 changes wavelength of light signals from wavelength selecting elements 702-704 to make the output wavelength equal to supplied direct current light of wavelength lambda2, lambda3, lambda4 respectively. |
