| 摘要 |
PURPOSE:To provide the optical transmitter which can perform high-speed modulator and compensate the operation point drift of an optical modulator without branching a light output and is suitably reduced in size as to the improvement of an optical transmitter equipped with a Mach-Zehnder type optical modulator. CONSTITUTION:This optical transmitter consists of the Mach-Zehnder type optical modulator 6 equipped with a substrate 14 having electrooptic effect, an optical waveguide 16 having a couple of branch waveguides 18 and 20 between a light incidence terminal and a light projection terminal 10 formed on a substrate 14, and electrodes 22 and 24 mounted on the branch waveguides 18 and 20, a light source 2 which is connected to the light incidence terminal 8, a photodetector 34 which is fixed on the substrate 14 and receives leak light emitted from the confluence point between the branch waveguides 18 and 20, a driving circuit 26, and an operation point control circuit 36. |
