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. 25, 2002
Filed:
Sep. 17, 1998
Kenneth Y. Maxham, Richardson, TX (US);
Alcatel, Paris, FR;
Abstract
Optical supervisory channels are provided in an optical fiber network by receiving, in a first network element ( ), a first optical supervisory channel signal ( ) at a first wavelength (&lgr; ) from a first direction ( ) on a first optical fiber ( ), and by transmitting, from the first network element ( ), a second optical supervisory channel signal ( ) at a second wavelength (&lgr; ) in a second direction ( ) and also on the first optical fiber ( ). An amplified optical wavelength division multiplexed transmission system utilizing these supervisory signals divides a revenue-traffic amplifying region of an optical amplifier, with a lower portion being used for transmission in the first direction and an upper portion being used for transmission in the second direction. Both the first and second wavelengths are located outside of a flat-gain amplifying region of the optical amplifier.