Title :
Gain optimization of germanosilicate fiber Raman amplifier and its applications in the compensation of Raman-induced crosstalk among wavelength division multiplexing channels
Author :
Seo, H.S. ; Oh, K. ; Paek, U.C.
Author_Institution :
Telecommun. Basic Res. Lab., Electron. & Telecommun. Res. Inst., Taejeon, South Korea
fDate :
9/1/2001 12:00:00 AM
Abstract :
Spectral characteristics of the stimulated Raman scattering (SRS) process were theoretically investigated for step-index silica optical fibers with various GeO2 concentrations. Optimal-fiber lengths and germanium concentration, where the first Stokes power reaches maximum, were calculated at various pump power levels for application in Raman amplifiers. Based on this analysis, we proposed and experimentally demonstrated a new channel-equalizing technique to simultaneously compensate Raman-induced crosstalk and amplify wavelength-division-multiplexing (WDM) signals using a discrete Raman amplifier in the 1.5-μm range. As a further application of SRS in germanosilicate glass fibers, we introduce an all-optical variable attenuator for channel equalization that could be used in dynamic optical power tilt control in WDM systems
Keywords :
Raman lasers; compensation; equalisers; germanium compounds; laser beams; optical crosstalk; optical fibre amplifiers; optical fibre communication; optical transmitters; optimisation; silicon compounds; stimulated Raman scattering; waveguide attenuators; wavelength division multiplexing; 1.5 mum; GeO2 concentrations; Raman amplifiers; Raman-induced crosstalk; SRS; SiO2-GeO2; WDM systems; all-optical variable attenuator; channel equalization; channel-equalizing technique; compensation; discrete Raman amplifier; dynamic optical power tilt control; first Stokes power; gain optimization; germanium concentration; germanosilicate fiber Raman amplifier; germanosilicate glass fibers; optimal-fiber lengths; pump power levels; spectral characteristics; step-index silica optical fibers; stimulated Raman scattering process; wavelength division multiplexing channels; wavelength-division-multiplexing signals; Germanium; Optical amplifiers; Optical attenuators; Optical control; Optical fiber amplifiers; Optical fibers; Raman scattering; Silicon compounds; Stimulated emission; Wavelength division multiplexing;
Journal_Title :
Quantum Electronics, IEEE Journal of
