Spectral characteristics of 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.
Bibliographical noteFunding Information:
Manuscript received October 25, 2000; revised May 1, 2001. This work was supported in part by the ERC program UFON sponsored by KOSEF, the BK21 program sponsored by MOE, and the ITRC-CHOAN program of Korea.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics
- Electrical and Electronic Engineering