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1. (WO2001005070) USE OF ISOLATORS TO OVERCOME LIMITATIONS TO RAMAN AMPLIFICATION RESULTING FROM RAYLEIGH SCATTERING

Pub. No.:    WO/2001/005070    International Application No.:    PCT/FR2000/001923
Publication Date: Fri Jan 19 00:59:59 CET 2001 International Filing Date: Thu Jul 06 01:59:59 CEST 2000
IPC: G02F 1/35
H01S 3/10
H01S 3/30
H04B 10/2537
H04B 10/291
Applicants: ALCATEL
BRANDON, Eric
BLONDEL, Jean-Pierre
LE ROUX, Patrice
TOULLIER, Denis
Inventors: BRANDON, Eric
BLONDEL, Jean-Pierre
LE ROUX, Patrice
TOULLIER, Denis
Title: USE OF ISOLATORS TO OVERCOME LIMITATIONS TO RAMAN AMPLIFICATION RESULTING FROM RAYLEIGH SCATTERING
Abstract:
The invention concerns an optical fibre transmission system comprising the fibre line and co-propagating pumping means (5) for an amplification distributed by stimulated Raman scattering in the fibre line, wherein the fibre line has several sections (7, 8) separated by isolators (11). The length of each of the sections, the power of the pump and the type of fibre are selected so as to avoid oscillations caused by Raman gain and Rayleigh scattering. The isolators enable to inject a more powerful pump, while preventing the Raman gain in the fibre from causing oscillations resulting from Rayleigh scattering.