Optical waveguides – With optical coupler – Switch
Patent
1993-11-16
1996-07-16
Healy, Brian
Optical waveguides
With optical coupler
Switch
385 14, 385 15, 385 16, 385 40, 385 45, 385 46, 385131, 385132, G02B 626
Patent
active
055374972
ABSTRACT:
An X-geometry optical switch includes primary and secondary input branch waveguides merging at a junction, and first and second output branch waveguides optically coupled to the input branches at the junction. In a dual electrode configuration, one electrode is positioned on the primary input branch waveguide and the other electrode on one of the input branch waveguides. By applying a common or opposite polarity bias to the electrodes, changes in the waveguide refractive optical indices are produced so that light propagating through the primary input is directed to one of the output branch waveguides in accordance with adiabatic modal evolution. In another X-geometry optical switch, the electrode on the output branch is eliminated by fabricating the output branch waveguides to exhibit a natural index asymmetry. Accordingly, since there is a normal ON-OFF path designation without biasing, only the single electrode on the primary input branch waveguide is necessary to effect switching.
REFERENCES:
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GTE Laboratories Incorporated
Healy Brian
Lohmann, III V. F.
Monks L. E.
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