Oscillators – Relaxation oscillators
Patent
1977-01-21
1978-09-05
Corbin, John K.
Oscillators
Relaxation oscillators
331 945C, 350 9615, G02B 514, H01S 310
Patent
active
041115210
ABSTRACT:
A semiconductor device which utilizes interferometric principles and electrical control to provide either light reflection or light transmission or partial light reflection/transmission. In a preferred embodiment, the device includes an input waveguide which divides into branch waveguides, with the branch waveguides being reunited at an output waveguide. When the optical path lengths of the branched waveguides varies by an integer multiple of the light wavelength in the guides, the light waves interfere constructively at the output waveguide causing light to be transmitted into the output waveguide. When the light wave in one branch waveguide undergoes a single pass phase shift of 180.degree. relative to the light wave in the other branch waveguide, the light waves interfere at the output waveguide and are caused to return to the input waveguide through the branch waveguides. The returning light wave in the one branch waveguide once again experiences a single pass 180.degree. phase shift relative to the light wave in the other branch waveguide such that the light waves are in phase at the input waveguide and the device appears as a reflector to a light source coupled to the input waveguide. Electrodes may be applied to one or both branch waveguides. Upon application of an electric field to the electrodes the relative optical path lengths of the branched waveguides will be changed allowing electrical control of the strength of the light reflection or transmission.
REFERENCES:
patent: 3320013 (1967-05-01), Johnson
patent: 3920314 (1975-11-01), Yajima
patent: 3957340 (1976-05-01), Giallorenzi
patent: 4007978 (1977-02-01), Holton
Burnham Robert D.
Scifres Donald R.
Streifer William
Corbin John K.
Levy Stewart
Raizes Sheldon F.
Ralabate James J.
Xerox Corporation
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