Apparatus for controlling light in electrooptic waveguides with

Details Apparatus for controlling light in electrooptic waveguides with Apparatus for controlling light in electrooptic waveguides with

1980-12-31

1983-11-15

Lee, John D.

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350 9613, 35016213, 364822, G02B 5172

Patent

active

044152264

ABSTRACT:
Apparatus for receiving light entering therein and controlling the directions in which portions of the light travel therethrough. Input means (21) directs portions (22) of the entering light (20) in a predetermined input direction (23) into a processing region (24) in a waveguide (25). Control means (26) temporarily and separately changes the index of refraction in each of a plurality of subregions (27) in the processing region (24), to modulate the light (22) travelling thereto in approximately the predetermined input direction (23) differently from any light travelling thereto in other input directions. Output means (28) receives portions (29) of the light travelling beyond the subregions (27) in at least one selected output direction (30) and responds thereto. Typically each subregion (27A-27H) is such that providing altered indexes of refraction therein can form in the subregion (27A-27H) a Bragg grating positioned with a direction of Bragg incidence approximately in the predetermined input direction (23). The control means ( 26) typically comprises an electrooptic grating (27A-27H) (having a plurality of interdigital electrodes (32)) in each subregion (27), and means (26A-26H) for applying a potential difference to each grating (27A-27H) separately, and thus providing an electrical field in each subregion (27) at selected times.
The apparatus (FIG. 1) is especially useful and advantageous in character generators (FIG. 3), correlators (FIGS. 4,5,9,10), and the like.

REFERENCES:
patent: 4340272 (1982-07-01), Papuchon et al.
patent: 4348075 (1982-09-01), Gottlieb et al.
Sov. J. Quantum Electron., 10(2), Feb. 1980, Belin et al., "Integrated-Optical Switching System", pp. 249-250.

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