The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 17, 1990
Filed:
Jul. 15, 1988
Jurgen Jahns, Shrewsbury, NJ (US);
Miles J Murdocca, Jackson, NJ (US);
AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
A crossover network is obtained by using a plurality of similar optical crossover stages. Each stage includes two light paths that combine at an output plane. One path provides the direct connection while the other path provides the crossover connection. To realize this crossover capability, each stage comprises a beam splitter element that accepts a beam containing an image array and develops therefrom two beams that are each directed in two different paths. Along one path, means are provided for reversal of selected segments of the image array and for sending of the reversed or crossed-over image through a beam combiner. Along the second path, means are provided for applying the light to a beam combiner without the image reversal. One disclosed means for image reversal is a prismatic mirror. The number of corners in such a mirror differs from stage to stage.