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

Volume

37

Issue

9

fYear

2001

fDate

9/1/2001 12:00:00 AM

Firstpage

1110

Lastpage

1116

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;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.945315

Filename

945315