| 摘要 |
PURPOSE:To obtain an optical circuit enabled to demultiplex light in a wide range by demultiplexing light with plural wavelength by a dielectric multilayer film filter arranged on the end surface of the outlet of a fiber and then demultiplexing the branched light by a diffraction grating. CONSTITUTION:The dielectric multi-layer film filter 8 is formed on the end surface of the outlet of an incident fiber 7 having a prescribed angle to branch different wavelength lambda1-lambda8 transmitted through the fiber 7 to transmitted light lambda1-lambda4 and reflected light lambda5-lambda8. The transmitted light is transmitted through a fiber 10, made incident to a recessed surface diffraction grating 6 and reflected by different angles in each wavelength the respective wavelength lambda1-lambda4 are image-formed and taken out on output fibers 12-1-12-4. On the other hand, the reflected light is transmitted through a fiber 11 and made incident to a recessed surface diffraction grating 6', and similarly, respective wavelength lambda5-lambda8 are image-formed and demultiplexed on output fibers 13-1-13-4. |
