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. 29, 1995
Filed:
Nov. 12, 1993
Applicant:
Inventor:
Ian J Hirst, Kent, GB;
Assignee:
Northern Telecom Limited, Montreal, CA;
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385 24 ;
Abstract
An optical transmission system comprises a concatenated chain of amplifiers disposed along a fiber transmission path. The signal to noise ratio is measured at each amplifier by selectively notch filtering a transmitted signal and measuring the power of the filtered and unfiltered signal within the notch bandwidth. A supervisory system controls the gain of each system amplifier whereby to maximize the aggregate signal to noise ratio of the system.