Optical beam switching device and telephone exchange...

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

H - Electricity

04

Q

344/54

H04Q 3/52 (2006.01)

Patent

CA 1205892

- 1 - ABSTRACT OF THE DISCLOSURE The invention relates to switches enabling -the con- nection by an optical method of at least one of the cir- cuits 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.

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