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. 14, 1998
Filed:
Feb. 13, 1997
Applicant:
Inventor:
Kevin Christopher Byron, Bishop's Stortford, GB;
Assignee:
Northern Telecom Limited, Montreal, CA;
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
385 27 ; 385 37 ;
Abstract
An optical wave, guide transmission filter has a 3 dB single mode waveguide coupler that is provided on one side of its coupling region with a spectrally matched pair of retro-reflecting optical waveguide Bragg grating reflectors. The optical path distance of one of the Bragg reflectors from the coupling region is greater than the equivalent distance of the other Bragg reflector by an amount greater than half the coherence length of a signal having a spectral width matched with that of the Bragg reflectors.