| 摘要 |
Apparatus (FIG. 2) receives light (11) in an input direction (12) and controls the directions in which portions of it travel through regions (13,14) to emerge (at 15) in an output direction (16) with intensity responsive to the product of two electrical potential differences multiplied together. Electrooptic reflective means (18) comprising two electrodes (19,20), on a region (13) in a waveguide (17), form a first Bragg grating (18) with a direction of Bragg incidence in the input direction (12). Similar means (23) comprising two electrodes (24,25), on a region (14), form a second Bragg grating (23) with a direction of Bragg incidence the same as a direction of Bragg reflection (22) from the first grating. A prism (26) directs light (11) from a laser (27) to enter in the input direction (12) into the electrooptic means (18). Control means (28) apply a potential difference (A) to the electrodes (19,20), to further direct light (11) in the region (13) by providing a first Bragg reflection thereof into the region (14). Control means (30) apply a potential difference (B) to the electrodes (24,25), to further direct light (11) by providing a second Bragg reflection thereof in the output direction (16) to output means (35,33) (FIG. 3), which receive the twice-reflected light and respond thereto. Apparatus as in FIGS. 3 and 5 can perform multiplication of vectors, and of a matrix by a vector.
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