Thermal optical switches for light

Optical waveguides – With optical coupler – Switch

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Details

385 18, 385 19, G02B 635

Patent

active

057321680

ABSTRACT:
A thermal optical switching cell has a channel of either gas or boilable liquid that crosses an optical waveguide at a forty-five degree angle. Two or more appropriately placed heaters use the water/steam/dry states of thermal ink jet technology to quickly insert, or extract, boilable liquid respectively into, or from, the channel. The boilable liquid has an index of refraction close to that of the guide. In the wet state, the channel contains the liquid and nearly all the light of the incoming guide traverses the liquid along the axis of the guide. In the dry state, the channel contains gas. Total internal reflection (TIR) occurs and light is directed at right angles away from the axis of the incoming channel. Adding a second waveguide, perpendicular to, and intersecting the first waveguide at the channel, forms a cross-bar switch. These liquid switching cells toggle between the wet and dry states. No power is required to hold the switch in the most recent state. A monitoring signal is described that can be used to determine the state of the switch. The dry state of these cells is totally internally reflecting. The wet state, however, is transmissive with a small, but objectionable, amount of reflection. A push-pull optical circuit is formed using paired cells and at least one TIR mirror. One of the cells of the circuit is always in the TIR, state to provide good isolation. This circuit has the property of reporting the state of the switch-pair so that a fault can be detected. If a fault is detected, repeated activation pulses can be applied to force liquid into the correct places to maintain proper operation of the circuit.

REFERENCES:
patent: 4490728 (1984-12-01), Vaught et al.
patent: 4505539 (1985-03-01), Auracher et al.
patent: 4640592 (1987-02-01), Nishimura et al.
patent: 4988157 (1991-01-01), Jackel et al.
patent: 5073000 (1991-12-01), Derfiny
patent: 5210801 (1993-05-01), Fournier et al.
patent: 5255332 (1993-10-01), Welch et al.
patent: 5382985 (1995-01-01), Becker et al.
patent: 5408548 (1995-04-01), Olmstead
patent: 5440654 (1995-08-01), Lambert, Jr.
Makoto Sato, "Electrocapillarity Optical Switch", OFC '94 Technical Digest, pp. 149-150, 1994 (No Month).
Janet L. Jackel, John J. Johnson, and W. J. Tomlinson, "Bistable Optical Switching Using Electrochemically Generated Bubbles", Optic Letters, vol. 15, No. 24, Dec. 15, 1990, pp. 1470-1472.

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