| 摘要 |
A waveguide type polarization scrambler is provided with; a Mach-Zehnder interferometic waveguide having the first input and output optical waveguides and second output and output waveguides on a dielectric substrate, a phase modulator having the third input output optical waveguides and fourth input and output waveguides and second input and output optical waveguides are connected to the third input and output waveguides, a light input means for inputting a light signal to the first input and output optical waveguides, and a light output means for receiving the light emitted from the fourth input and output optical waveguides. It is possible to apply tolerant device fabrication process conditions without complex fabrication process and possible to adjust easily the output light to randomized polarization state without exact adjustment of the optical axis. In a waveguide type polarization scrambler which utilizes a dielectric substrate, the deterioration of randomized polarization state due to polarization dependency caused in the waveguide type polarization scrambler is prevented.
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