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:
Oct. 09, 2001
Filed:
Dec. 23, 1999
Applicant:
Inventors:
James E Whiteaway, Sawbridgeworth, GB;
George H Thompson, Sawbridgeworth, GB;
Terry Bricheno, Gt Sampford, GB;
Assignee:
Nortel Networks Limited, St. Laurent, CA;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 6/34 ;
U.S. Cl.
CPC ...
G02B 6/34 ;
Abstract
An optical comb filter is constructed from a monolithic arrangement of two identical integrated optics format arrayed waveguide diffraction gratings connected back-to-back via a star coupler incorporating a field stop (spatial filter,Alternatively, only one of the diffraction gratings is employed in conjunction with a combined field stop and retro-reflector, the other end of the diffraction grating being optically coupled with one port of an optical circulator.