| 摘要 |
PROBLEM TO BE SOLVED: To reduce the effect of a temp. for a multiplexer without necessitating of performing the operation in the outside by providing length and a refractive index suitable for controlling positions in which various wavelengths are outputted from a device in plural spans containing respective optical waveguides and making these positions depend on the fluctuation in the temp. SOLUTION: Respective optical waveguides contain two spans 140, 142 placed serially, the spans 140, 142 are provided with respective lengths and refractive indexes suitable for controlling positions in which various wavelengths are outputted from a device and these positions depend on the fluctuation in the temp. For instance, in one form, the refractive indexes of the material of the spans 140, 142 of the respective optical waveguides are changed in the same direction corresponding to the temp. However, the respective length of the spans 140, 142 are changed reversely between the optical waveguides. Further, in another form, the refractive indexes of the material of the spans 140, 142 are changed reversely corresponding to the temp. and the respective lengths of the spans 140, 142 are changed in the same direction between the optical waveguides. |
