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:
Jun. 10, 1997
Filed:
Nov. 16, 1995
Applicant:
Inventor:
Kevin C Byron, Bishop's Stortford, GB;
Assignee:
Northern Telecom Limited, Montreal, CA;
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385 37 ;
Abstract
The isolation between stop and pass bands afforded by an optical fibre normally reflective Bragg grating reflective over a waveband .lambda..sub.3 is enhanced by preceding it with two blazed Bragg gratings that are spectrally selectively mode coupling respectively over wavebands .lambda..sub.1 and .lambda..sub.2, where the .lambda..sub.3 waveband compasses the spectral waveband separating waveband .lambda..sub.1 from waveband .lambda..sub.2. The fibre is connected to an optical circulator or one port of an optical 4-port 3 dB coupler.