| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology of improving output light intensity and improving an extinction ratio when a mechanism where transmitted light is theoretically attenuated and an excessive transmission loss is generated in the part is applied as a phase controller. SOLUTION: This optical functional element of a Mach-Zehnder interferometer type includes an input optical waveguide 5, a branching section 6, a first optical path 7, a second optical path 8, an optical modulation section 12 disposed in the second optical path, a multiplexing section 9 connected to the first optical path and the second optical path, and output waveguides 10 and 11 for receiving multiplexed light from the multiplexing section. The light propagation loss in the second optical path is made larger than that in the first optical path resulting from the optical modulation section, the branching section has a fixed non-equivalent branch ratio, and light intensity incident into the second optical path is made higher than light intensity incident into the first optical path. COPYRIGHT: (C)2010,JPO&INPIT |
