Optical waveguides – Temporal optical modulation within an optical waveguide – Electro-optic
Reexamination Certificate
2004-03-18
2009-02-17
Song, Sarah (Department: 2874)
Optical waveguides
Temporal optical modulation within an optical waveguide
Electro-optic
C385S040000
Reexamination Certificate
active
07492975
ABSTRACT:
The present invention provides an optical switch, an optical modulator, and a wavelength variable filter each of which has a simple configuration, which requires only a low driving voltage, which is independent of polarization, and which can operate at high speed. An optical switch according to the present invention includes a 3-dB coupler (16) placed on an input, a 3-dB coupler (17) placed on an output, and two optical waveguides connecting the input-side 3-dB coupler and the output-side 3-dB coupler together. The optical switch also includes a phase modulating section (18) that applies electric fields to one or both of the two optical waveguides. At least two optical waveguides are a crystal material including KTaxNb1-xO3(0<x<1) and KxLi1-xTayNb1-yO3(0<x<1, 0<y<1), or KTaxNb1-xO3or KxLi1-xTayNb1-yO3.
REFERENCES:
patent: 4291939 (1981-09-01), Giallorenzi et al.
patent: 4866406 (1989-09-01), Minakata et al.
patent: 5361270 (1994-11-01), Heismann
patent: 5712935 (1998-01-01), Miyakawa
patent: 5886807 (1999-03-01), Cummings
patent: 6363189 (2002-03-01), Minakata et al.
patent: 6470125 (2002-10-01), Nashimoto et al.
patent: 6583917 (2003-06-01), Mellomi et al.
patent: 2002/0126933 (2002-09-01), Goh et al.
patent: 2002/0141040 (2002-10-01), Fujiura et al.
patent: 1 260 839 (2002-11-01), None
patent: 53-006054 (1978-01-01), None
patent: 53-054040 (1978-05-01), None
patent: 59-093430 (1984-05-01), None
patent: 63-049732 (1988-03-01), None
patent: 02-114243 (1990-04-01), None
patent: 05-119287 (1993-05-01), None
patent: 06-289342 (1994-10-01), None
patent: 09-080490 (1997-03-01), None
patent: 09-243976 (1997-09-01), None
patent: 11-326855 (1999-11-01), None
patent: 2002-040378 (2002-02-01), None
patent: 2002-296632 (2002-10-01), None
patent: 2004-063506 (2004-02-01), None
Haruna Nishihara et al.,Optical Integrated Circuits, OHM Co., Ltd., 1985, pp. 310-326 with partial English translation.
Yasufumi Yamada et al,An Application of a Silica-on-Terraced-Silicon Platform to Hybrid Mach-Zehnder Interferometric Circuits Consisting of Silica-Waveguides and LiNbO3Phase-Shifters, IEEE Photonics Technology Letters, vol. 6, No. 7, Jul. 1994, pp. 822-824.
P. Granestrand,Integrated Optics 4 x 4 Switch Matrix with Digital Optical Switches, Electronics Letters, vol. 26, No. 1, Jan. 4, 1990, pp. 4-5.
Enbutsu Koji
Fujiura Kazuo
Fushimi Hiroshi
Imai Tadayuki
Kurihara Takashi
Nippon Telegraph and Telephone Corporation
Song Sarah
Workman Nydegger
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