Optical beam switching device and telephone exchange comprising

Details Optical beam switching device and telephone exchange comprising Optical beam switching device and telephone exchange comprising

1982-09-24

1985-09-24

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

350 362, H04B 900

Patent

active

045436622

ABSTRACT:
The invention relates to switches enabling the connection by an optical method of at least one of the circuits of a set of input circuits to at least one circuit of a set of output circuits. It consists in illuminating a photosensitive medium with parallel input beams coming from a set of input circuits. The input beams are then diffracted on strata inscribed on the medium to reach one of the circuits of a set of photoreceptor circuits. The strata are inscribed by interference of two inscribing beams of which the wavelength differs from that of the input beams; the wavelength of these input beams not lying within the range of spectral sensitivity of the photosensitive medium.

REFERENCES:
patent: 3614192 (1971-10-01), Preston, Jr.
patent: 3831035 (1974-08-01), Hill
patent: 3985975 (1976-10-01), Steensma
patent: 4383734 (1983-05-01), Huignard et al.
patent: 4403352 (1983-09-01), Huignard et al.

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