Title :
Rayleigh scattering limitations in distributed Raman pre-amplifiers
Author :
Hansen, P.B. ; Eskildsen, L. ; Stentz, A.J. ; Strasser, T.A. ; Judkins, J. ; DeMarco, J.J. ; Pedrazzani, R. ; DiGiovanni, D.J.
Author_Institution :
Lucent Technol., AT&T Bell Labs., Holmdel, NJ, USA
Abstract :
The properties and fiber dependence of distributed Raman pre-amplifiers and, in particular, the effects of Rayleigh backscattering, which limits the sensitivity improvements that can be realized, is discussed. Bit-error-rate (BER) measurements show improvements In the effective receiver sensitivity of 6.2 and 7.0 dB for dispersion shifted fiber (DSF) and silica-core fiber (SCF), respectively. Theoretical predictions of the effective noise figure based on measured fiber parameters indicate improvements of 6.6 dB for DSF and 7.4 dB for SCF in good agreement with the measured optical SNR. The optimum receiver sensitivity is obtained in DSF with less than 600 mW of pump power, whereas the 0.8-dB superior performance of the SCF requires approximately 1 W.
Keywords :
Rayleigh scattering; backscatter; fibre lasers; optical fibre dispersion; optical pumping; optical receivers; preamplifiers; sensitivity; 1 W; 600 mW; Raman lasers; Rayleigh backscattering; Rayleigh scattering limitations; bit-error-rate measurements; dispersion shifted fiber; distributed Raman pre-amplifiers; effective noise figure; effective receiver sensitivity; fiber dependence; measured optical SNR; optical fiber amplifiers; optimum receiver sensitivity; pump power; sensitivity improvements; silica-core fiber; Backscatter; Bit error rate; Dispersion; Noise figure; Noise measurement; Optical noise; Optical pumping; Optical receivers; Raman scattering; Rayleigh scattering;
Journal_Title :
Photonics Technology Letters, IEEE
