| 摘要 |
PURPOSE:To provide a waveguide type device with a monitor which has no wavelength dependency upon a monitor output and provides the same monitor ratio or an optional monitor ratio with at least two wavelengths. CONSTITUTION:A coupled waveguide 15 is at a center axis interval of 15mum from a directional coupler part input waveguide and the both constitute a directional coupler part 40. Light propagated in the input waveguide 10 is distributed by a branch part 20 to a branch part 30 and a monitor waveguide 12. Light in the monitor waveguide 12 is partially distributed by the directional coupler part 40 to the coupled waveguide 15 and the remaining light is outputted to a monitor output waveguide 16. |
