Title :
Phase-matched four-wave mixing between pumps and signals in a copumped Raman amplifier
Author :
Wong, William S. ; Chen, Chien-Jen ; Ho, Min-Chen ; Lee, Hak Kyu
Author_Institution :
Onetta Inc., Sunnyvale, CA, USA
Abstract :
We observe four-wave mixing (FWM) between copropagating pumps and signals in a Raman amplifier when the zero-dispersion wavelength of the transmission fiber lies symmetrically between the pump and the signal wavelengths. The resultant FWM products, which grow as they experience Raman gain along the fiber, can degrade the signal´s optical signal-to-noise ratio by as much as 10 dB for a Raman ON-OFF gain of 15 dB.
Keywords :
Raman lasers; laser noise; multiwave mixing; optical fibre amplifiers; optical fibre dispersion; optical phase matching; optical pumping; FWM products; Raman ON-OFF gain; Raman gain; chromatic dispersion; copropagating pumps; copumped Raman amplifier; optical fiber amplifiers; optical fiber dispersion; optical signal-to-noise ratio; phase-matched four-wave mixing; pump wavelength; signal wavelength; split-step Fourier simulations; transmission fiber; zero-dispersion wavelength; Degradation; Fiber nonlinear optics; Four-wave mixing; Frequency conversion; Optical amplifiers; Optical fiber amplifiers; Optical frequency conversion; Optical mixing; Optical pumping; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2002.806074
