H - Electricity – 01 – S
Patent
H - Electricity
01
S
345/12
H01S 3/091 (2006.01) H01S 3/02 (2006.01) H01S 3/06 (2006.01) H04B 10/17 (2006.01) H01S 3/067 (2006.01) H01S 3/30 (2006.01)
Patent
CA 2024352
DISTRIBUTED AMPLIFICATION FOR LIGHTWAVE TRANSMISSION SYSTEM Abstract Bidirectional lightwave transmission is restored uniform amplification of lightwave signals over long spans of optical fiber is achieved by employing distributed amplification over spans. Distributed amplification is achieved with an amplifying optical fiber which includes a long length of optical fiber having a dilute rare-earth dopant concentration substantially in the fiber core region, and a corresponding pump signal generator at at least one end of the doped fiber having the appropriate wavelength and power to cause amplification of optical signals by both Raman effects and stimulated emission from the rare-earth dopants. Dilute concentrations are understood as the range of concentrations substantially satisfying the condition that the gain from the rare-earth dopant, when near saturation, is substantially equal to the fiber loss.
Kirby Eades Gale Baker
Tyco Submarine Systems Ltd.
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