Semiconductor optical waveguide device including s-shaped...

Optical waveguides – Integrated optical circuit

Reexamination Certificate

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C385S031000, C385S039000, C385S042000, C385S045000, C385S047000

Reexamination Certificate

active

06993213

ABSTRACT:
Substantially S-shaped optical waveguides are embedded in a semiconductor substrate, and at least two optical waveguide returning parts are interposed between the input and output ends of the waveguides. Each of the optical waveguide returning parts includes a multiplexing portion. A reflecting part is located on a rear end side of the multiplexing portion of each optical waveguide returning part. Thus, the length between input and output ends of the waveguides can be reduced, suppressing bending loss, and achieving a high speed and small size integrated optical device.

REFERENCES:
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patent: 6741781 (2004-05-01), Furuyama
patent: 2003/0081902 (2003-05-01), Blauvelt et al.
patent: 3-256028 (1991-11-01), None
patent: 3256028 (1991-11-01), None
Soldano et al. “Optical Multi-Mode Interference Devices Based on Self-Imaging: Principles and Applications”. Apr. 1995, pp. 615-267, vol. 13(4), Journal of Lightwave Technology.
L. Soldano et al., “Optical Multi-Mode Interference Devices Based of Self-Imaging: Principles and Applications,” Apr. 1995, pp. 615-627, vol. 13(4),Journal of Lightwave Technology.
P.V. Studenkov et al., “Monolithic Integration of an All-Optical Mach-Zehnder Demultiplexer Using an Asymmetric Twin-Waveguide Structure,” Jun. 2001, pp. 600-602, vol. 13(6),IEEE Photonics Technology Letters.

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