Optical matrix-vector multiplication

Details Optical matrix-vector multiplication Optical matrix-vector multiplication

1985-01-24

1986-12-30

Goldberg, E. A.

Boots, shoes, and leggings

364845, 350 9614, 35016211, G06G 716, G02B 610, G02B 518

Patent

active

046334289

ABSTRACT:
An optical matrix-vector multiplier for multiplying an m-row n-column matrix by an n-component vector to form an m-component vector (FIG. 1). In the specific case of a 3.times.3 matrix (FIGS. 4a and 4b), the multiplier comprises three light-emitting devices (21,22,23), for example LEDs, each emitting at a different wavelength (.lambda..sub.1, .lambda..sub.2, .lambda..sub.3), an acousto-optic modulator (29) driven by each x value in turn, and three integrating photodetectors (32, 33, 34) each receptive to a respective one of the different wavelengths. A single collimating lens (30) serves to apply light, emitted by each of the LEDs in turn in response to respective matrix components, to the modulator (29). The LEDs may be connected by respective optical fibers (24, 25, 26) to a fiber coupler (28) and thence via a common optical fiber (27) to the lens (30), or coupled by a dispersive element (35--FIG. 5) to the lens (30). Use of a single collimating lens facilitates integration of the multiplier elements into an integrated optic device.

REFERENCES:
patent: 4567569 (1986-01-01), Caulfield

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