Sagnac Optical Logic Gate

M. Christina Gabriel, Fair Haven, Henry. H. Houh, Sea Bright, and Norman A. Whitaker, Atlantic Highlands, all of N.J., assignors to AT&T Bell Laboratories, Murray Hill, N.J.

Filed May 10, 1990, Ser. No. 521,774

Int. Cl.5 G01B 9/02

U.S. Cl. 356-345
45 Claims

means for injecting a signal pulse applied at said input port, into said material, to develop an interacting signal that travels in said material in one direction and a reference signal that travels in said material in the opposite direction;

means for controllably injecting a pump pulse into said material, to travel through said material in said one direction at a speed that is different from the speed of said interacting signal and to thus form two co-acting pulses that travel at said one direction, with the timing of said pump pulse, in relation to said interacting signal, controlled to position the faster on of the co-acting pulses behind the slower one of the co-acting pulses, to cause the faster one of the co-acting pulses to overtake and surpass the slower one of the co-acting pulses as the co-acting pulses travel in said material; and

means for compining said reference signal after its travel through said material and said interacting pulse after its travel through said material.

Ike Chuang has prepared an interesting document on the Sagnac.

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