发明授权
- 专利标题: Light modulation device
- 专利标题(中): 调光装置
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申请号: US902090申请日: 1986-08-27
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公开(公告)号: US4685763A公开(公告)日: 1987-08-11
- 发明人: Kunio Tada , Yoshikazu Nishiwaki , Shunji Matsuoka
- 申请人: Kunio Tada , Yoshikazu Nishiwaki , Shunji Matsuoka
- 申请人地址: JPX Osaka
- 专利权人: Sumitomo Electric Industries, Ltd.
- 当前专利权人: Sumitomo Electric Industries, Ltd.
- 当前专利权人地址: JPX Osaka
- 优先权: JPX58-56947 19830331
- 主分类号: G02B6/12
- IPC分类号: G02B6/12 ; G02F1/015 ; G02F1/025 ; G02F1/313
摘要:
A light modulation device according to the present invention comprises a substrate, a substrate layer, an optical waveguide layer, and buffer layers, in the order from the bottom upward, all formed of either n-type or p-type compound semiconductor crystal. In this light modulation device, in order to capture the light in the optical waveguide layer, the composition ratio of the compound semiconductor is so determined that refractive index is at least approximately 0.1% higher in the optical waveguide layer than in the substrate layer and in the buffer layers. Further, the carrier density is low in the optical waveguide layer and in the buffer layers so that the applied voltage is applied mainly to the optical waveguide layer. Because of such construction, the light modulation device according to the present invention is free from strict conditions required in an etching process, is small in absorption loss of light, and can be used as a component of monolithic optical integrated circuit.