| 摘要 |
PURPOSE:To obtain the optical transmitter which provides high-speed modulation, compensates the operation point drift of an optical modulator, and is suitably reduced in size as to the imement of an optical transmitter equipped with a Mach-Zehnder optical modulator. CONSTITUTION:This optical transmitter consists of a substrate 14 which has electrooptic effect, the Mach-Zehnder optical modulator 6 equipped with an optical waveguide 16 having a couple of branch waveguides 18 and 20 and electrodes 22, 24 loaded on the branch waveguides between a light incidence terminal 8 and a light projection terminal 10 formed on the substrate, a light source 2 which is connected to the light incidence terminal 8, a photodetector 34 which is fixed to the substrate opposite the exposed surface of the optical waveguide 16 nearby the light projection terminal 10, a driving circuit 26, and an operation point control circuit 36. |
