Optical waveguides – With optical coupler – Particular coupling structure
Patent
1995-03-22
1996-02-27
Ullah, Akm E.
Optical waveguides
With optical coupler
Particular coupling structure
385 16, G02B 626, G02B 642
Patent
active
054955440
ABSTRACT:
A polarization-independent electro-optically switched directional coupler utilizing reverse differential propagation constant control comprises an electro-optic material having at least a pair of wave guide channels within an interaction region and at least a pair of electrodes for selectively producing an electric field across the wave guide channels which electro-optically alters an optical propagation constant of the wave guide channels so as to vary the effects of an optical coupling between the wave guide channels. The wave guide channels have a curvature region defined by a constant radius that is selected so as to coincide a set of operating voltages for an optical switch state of the directional coupler for a transverse magnetic (TM) polarization mode with a set of operating voltages for an optical switch state of the directional coupler for a transverse electric (TE) polarization mode by shifting the optical switch state of the TM polarization mode relative to the optical state of the TE polarization mode due to the relative difference between the magnitude of the electro-optic effect for the TM polarization mode light signal in the curvature region and magnitude of the electro-optic effect for the TE polarization mode light signal in the curvature region.
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Attanasio Daniel V.
Smith Terry L.
Watson James E.
Griswold Gary L.
Gwin, Jr. H. Sanders
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Ullah Akm E.
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