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:
Jul. 28, 1998
Filed:
Oct. 29, 1996
Applicant:
Inventor:
Alan Fielding, Bishops Stortford, GB;
Assignee:
Northern Telecom Limited, Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04J / ;
U.S. Cl.
CPC ...
359124 ; 359130 ; 359187 ; 385 24 ; 385 37 ;
Abstract
A channel insertion filter for a WDM system is provided by an optical waveguide Mach Zehnder comprising a pair of 3dB couplers interconnected by a pair of interference arms in which are created a pair of Bragg reflectors. These reflectors are partially reflecting at the channel insertion wavelength so that some of the light of the associated channel transmitter is transmitted by them to provide a feedback control loop error signal for regulating the emission wavelength of the transmitter.