H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 10/17 (2006.01) H01S 3/30 (2006.01)
Patent
CA 2475088
An optical fiber transmission system (10) comprising a transmitter (11) and a receiver (12) at the two ends of an optical fiber (13). The transmitter comprises a signal laser (14) for generation of a transmission signal and the receiver comprises a pump laser (18) for production of a pump signal, which is incorporated in the fiber (13) in a direction opposite to that of the transmission signal to obtain amplification using the Brillouin effect of the transmission signal. The central frequency, Fsign, of the transmission signal of the signal laser (14) and the central frequency, Fpump, of the pump signal of the pump laser (18) are such that (Fpump.plusmn.20MHz)- (Fsign.plusmn.20MHz)=10GHz.plusmnØ1GHz, and the two lasers are controlled locally such that the maximum variation .DELTA.fsign, of the central frequency of the transmission signal, the maximum variation, .DELTA.fpump, of the central frequency of the pump signal, and the bandwidth, Bfsign, of the transmission signal have the following relationship Bfsign + .DELTA.fsign + .DELTA.fpump= 100MHz.
La présente invention concerne un système de transmission à fibres optiques (10) comprenant un émetteur (11) et un récepteur (12) aux deux extrémités d'une fibre optique (13). L'émetteur comprend un laser de signal (14) destiné à produire un signal de transmission et le récepteur comprend un laser pompe (18) destiné à produire un signal de pompe, que l'on incorpore dans la fibre (13) dans une direction opposée à celle du signal de transmission afin d'obtenir une amplification en utilisant l'effet Brillouin du signal de transmission. La fréquence centrale, Fsign, du signal de transmission du laser de signal (14) et la fréquence centrale, Fpump, du signal de pompe du laser pompe (18) sont telles que (Fpump.plusmn.20MHz)-Fsign.plusmn.20MHz)=10GHz.plusmn.0,1GHz, et les deux lasers sont commandés localement de sorte que la variation maximale, ?fsign, de la fréquence centrale du signal de transmission, la variation maximale, ?fpump, de la fréquence centrale du signal de pompe, et la largeur de bande, Bfsign, du signal de transmission possèdent la relation suivante : Bfsign + ?fsign + ?fpump= 100MHz.
Bellosi Antonio
Fella Paolo
Quargnolo Orietta
Ericsson Ab
Kirby Eades Gale Baker
Marconi Communications Spa
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