Optical waveguides – With optical coupler – Switch
Reexamination Certificate
2005-07-07
2008-03-11
Connelly-Cushwa, Michelle R. (Department: 2874)
Optical waveguides
With optical coupler
Switch
C385S011000, C385S017000
Reexamination Certificate
active
07343063
ABSTRACT:
A light signal switching apparatus has an input port and output ports, and outputs an output light from a desired output port. The apparatus has a splitter polarizing an input light into first and second polarized light whose polarization planes are different mutually by 90 degrees, a first polarization controller rotating a polarization plane of the second polarized light by 90 degrees to output a third polarized light, a first optical switch switching a path of the first polarized light to the desired output port side, a second optical switch switching a path of the third polarized light to the desired output port side, a second polarization controller rotating a polarization plane of the first polarized light by 90 degrees to output a fourth polarized light, and a combiner combining the third polarized light with the fourth polarized light, to output a combined light to the desired output port.
REFERENCES:
patent: 6915031 (2005-07-01), Maki et al.
patent: 2004/0247227 (2004-12-01), Eder et al.
Baojun Li, et al., “1.55 μm Reflection-Type Optical Waveguide Switch Based on SiGe/Si Plasma Dispersion Effect”, Applied Physics Letters, vol. 75, No. 1, Jul. 1999, pp. 1-3.
Baojun Li, et al., “2×2 Optical Waveguide Switch With Bow-Tie Electrode Based on Carrier-Injection Total Internal Reflection in SiGe Alloy”, IEEE Photonics Technology Letters, vol. 13, No. 3, Mar. 2001, pp. 206-208.
Hiroaki Inoue, et al., “An 8 mm Length Nonblocking 4×4 Optical Switch Array”, IEEE Journal on Selected Areas in Communications, vol. 6, No. 7, Aug. 1988, pp. 1262-1265.
K. Ishida, et al., “InGaAsP/InP Optical Switches Using Carrier Induced Refractive Index Change”, Applied Physics Letters, vol. 50, No. 19, Jan. 1987, pp. 141-142.
“Optical Integrated Circuit -Fundamentals and Applications-”, Japan Society of Applied Physics, First Edition, Chapter 5, Apr. 10, 1988, 5 pages.
Asano Yoshiyuki
Iio Shinji
Miura Akira
Nakajima Shin-ichi
Suehiro Masayuki
Connelly-Cushwa Michelle R.
Yokogawa Electric Corporation
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