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:
Mar. 04, 2008
Filed:
Jun. 28, 2006
Gabriel Charlet, Villiers le Bacle, FR;
Loïc Becouarn, Paris, FR;
Gabriel Charlet, Villiers le Bacle, FR;
Loïc Becouarn, Paris, FR;
Alcatel, Paris, FR;
Abstract
An optical wavelength division multiplex transmission system () for transmitting optical signals (S) on a plurality of wavelength channels has a transmitting terminal () and a receiving terminal () interconnected by a transmission line () with at least one, preferably a plurality of optical amplifiers (). Each of the optical amplifiers () comprises a Raman amplifier () with at least one pump light source (-) for pumping the transmission line () upstream the optical amplifier (). It is proposed that each optical amplifier () comprises a single tap coupler () arranged downstream of the Raman amplifier (). Optical receiving and transmitting means () may be connected to the transmission line () via the tap coupler () for communication of data (TX, Di) between at least the transmitting terminal () and the optical amplifiers () on an optical supervisory channel (OSC) with a given wavelength. Alternatively or in addition, monitoring means () for monitoring at least one optical transmission parameter may be connected to the transmission line via the tap coupler (). It is also possible to couple each optical amplifier () by means of its tap coupler () to a corresponding optical amplifier (') of a second substantially identical transmission system (′) for transmitting optical signals (S′) in an opposite direction via a transmission line (′) of the second system (′). The all-Raman optical transmission system thus obtained shows improved performance, in particular with respect to loss, noise, PMD, and PDL, while distinguishing itself from prior art systems by its simplicity and corresponding cost-effectiveness.