Light pulse amplification in long optical fibers

H - Electricity – 01 – S

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Details

H01S 3/30 (2006.01) G01M 11/00 (2006.01) H04B 10/17 (2006.01)

Patent

CA 2571453

A method is disclosed for amplifying a light pulse (S) in an optical fiber (1), wherein a Raman pump signal (RPS) having a lower wavelength than the light pulse (S) is transmitted at a selected interval of time after the light pulse (S) into an end (IA) of an optical fiber(l), with dispersion such that the Raman pump signal (RPS) travels faster through the fiber(1) than the light pulse(S) and reaches and enhances the light pulse (S) after the light pulse has travelled along a selected distance (dl) through the fiber, wherein the Raman pump signal (RPS) is ramped in a substantially linear manner such that the amplification increases with the distance along which the light pulse has travelled along the length of the fiber from Al= S1+RPSmin at a distance dl to A2=S+RPSmax at a distance d2 >dl from said end (lA) of the fiber 1 and such that the Raman gain increase is substantially similar to the fiber losses of the amplified signal. The use of a ramped Raman pump signal (RSP) mitigates Stimulated Brillouin Scattering (SBS) in the fiber (1) and extends the operational range of a fiber optical sensing system.

La présente invention concerne un procédé pour amplifier une impulsion lumineuse (S) dans une fibre optique (1). En l'occurrence, un signal de pompe de Raman (RPS) dont la longueur d'ondes est inférieure à celle de l'impulsion lumineuse (S) est transmis avec une périodicité définie après l'impulsion lumineuse (S) dans une extrémité (1A) d'une fibre optique (1). La dispersion admise fait que le RPS parcourt la fibre (1) plus rapidement que l'impulsion lumineuse (S), atteignant et renforçant l'impulsion lumineuse (S) après que l'impulsion lumineuse ait parcouru une distance choisie (d1) dans la fibre. En outre, le RPS est mis en rampe de façon sensiblement linéaire de façon que l'amplification augmente avec la distance parcourue par l'impulsion le long du segment de fibre partant de A1 = S1+RPSmin à une distance d1 et aboutissant à A2 = S+RPSmax à une distance d2 >d1 à partir de ladite extrémité (1A) de la fibre (1), et de façon que l'augmentation de gain de Raman soit sensiblement semblable aux pertes en fibre du signal amplifié. L'utilisation du RPS en rampe permet d'atténuer la diffusion de Brillouin stimulée ou "SBS" (Stimulated Brillouin Scattering) dans la fibre (1) et prolonge la portée opérationnelle du système de détection à fibre optique.

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