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:
Aug. 12, 1997
Filed:
Sep. 23, 1994
Gary A Ball, Simsbury, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
An efficient wavelength multiplexer/demultiplexer includes a plurality of 2.times.2 optical couplers 122,180,200,220, each having a pair of matched gratings 130,142; 182,184; 202,204; and 222,224, having bandpass wavelengths .lambda..sub.1, .lambda..sub.2, .lambda..sub.3, .lambda..sub.4, respectively, attached to two of the ports. An input signal 116 enters a port 120 and is split and reflected off the gratings 130,142 and then recombined so as to provide all the input signal 116 at an output port 150 and no reflection out of the port 120. Another input signal 154 is incident on the grating 142 which is passed by the grating 142 and is coupled onto the output port 150 with the signal 116 as a signal 160. A similar arrangement exists for the other couplers 180,200,220 connected in series, each of which adds another input wavelength. Alternatively, in a de-multiplexing application the signal 116 may be broadband and the signals 154,190,206,230 would be separate output wavelengths.