Optical waveguides – With optical coupler – Switch
Patent
1994-07-18
1995-06-13
Gonzalez, Frank
Optical waveguides
With optical coupler
Switch
385 18, 385 21, 385 22, 385 23, 385 24, 385 31, 385 36, 385 37, 385 40, G02B 634
Patent
active
054251150
ABSTRACT:
A Fabry-Perot etalon 10 is located in the light path 30 between a light sourcesinks 40 and 44. The etalon is polarization insensitive, and its optical path length and transmission wavelength(s) is controlled by a bias source 60. When light at the desired wavelength is propagating from source 40, the bias is set to establish transmission through the etalon at that wavelength, whereupon the light propagates to the sink 44, and the switch is transmissive. By contrast, if the switch is to be nontransmissive, the bias sets the transmission wavelengths of the etalon on either side of the wavelength produced by source 40, whereupon the light from source 40 is reflected by the etalon, and does not reach sink 44. In a second embodiment, a third sourcesink 48 is coupled in a second light path 330a, for being coupled to the first sourcesink 40 when the etalon is set for reflection, to thereby form a single-pole, double-throw switch. In a third embodiment, a fourth sourcesink 68 is coupled in an extension maim of the second light path.
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"Electro-Optic Switch Using A Liquid Crystal Fabry-Perot Filter", Patel, published in SPIE, vol. 1665 (1992), pp. 244-249 (no month avail.).
"Electrically Tunable and Polarization Insensitive Fabry-Perot Etalon With a Liquid-Crystal Film", Patel et al., published at pp. 2491-2493 of Appl. Phys. Lett. 58 (22), 3 Jun. 1991.
Berard C. A.
Gonzalez Frank
Martin Marietta Corporation
Meise W. H.
Young S. A.
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