Title:
WAVEGUIDE TYPE OPTICAL DEVICE
Document Type and Number:
Japanese Patent JPH04328720
Kind Code:
A
Abstract:
PURPOSE:To prevent light output power from varying with the polarization state of input light. CONSTITUTION:Optical waveguides 12 and 13 which have a higher refractive index than a substrate 1 are formed on the substrate 11 and control electrodes 15 and 16 are formed on the close parts of the optical waveguides 12 and 13 across a buffer layer 14. The length of the optical waveguides 12 and 13 which are close at the part of a directional coupler 17 is set to the complete coupling length for TE polarized light and the complete coupling length for TM polarized light is set shorter than the complete coupling length for the TE polarized light. Further, a TE polarized light absorbing film 19 is formed on the buffer layer 14 between the directional coupler 17 and a projection end with specific length.
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Inventors:
KAWASHIMA HISAO
Application Number:
JP9903691A
Publication Date:
November 17, 1992
Filing Date:
April 30, 1991
Export Citation:
Assignee:
NEC CORP
International Classes:
G02F1/035; G02F1/055; G02F1/313; G02B6/12; (IPC1-7): G02B6/12; G02F1/055; G02F1/313
Attorney, Agent or Firm:
Umeo Yamauchi
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