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:
Feb. 01, 2005
Filed:
Apr. 04, 2003
Arnaud Bisson, Orsay, FR;
Alice Michaud, Paris, FR;
Emmanuel Rossi, Paris, FR;
Guy Balland, Ste Genevieve des Bois, FR;
Arnaud Bisson, Orsay, FR;
Alice Michaud, Paris, FR;
Emmanuel Rossi, Paris, FR;
Guy Balland, Ste Genevieve des Bois, FR;
Alcatel, Paris, FR;
Abstract
An optical system dynamically measures power loss in an optical fiber () having an entry end (E) adapted to receive optical signals and an exit end (S) adapted to deliver the signals. The system comprises modulation means () upstream from the entry end (E) and adapted to modulate the amplitude of the optical signals with a low-frequency modulation signal having a modulation index inversely proportional to the input power (Pe) of the optical signals, and detection means () downstream from the exit end (S) and adapted to extract from the modulated optical signals primary information representative of the output amplitude of the modulation signal and to deduce from the primary information secondary information representative of a variation in the power loss in the fiber.