Title :
Cross-gain modulation in Raman fiber amplifier: experimentation and modeling
Author :
Menif, Mourad ; Karásek, Miroslav ; Rusch, Leslie Ann
Author_Institution :
Centre for Opt., Photonics & Lasers, Laval Univ., Que., Canada
Abstract :
The effects of channel loss on the performance of Raman fiber amplifiers (RFA) are investigated both experimentally and theoretically. Signals from one distributed-feedback (DFB) laser and an external cavity laser (ECL) were transmitted through counterdirectionally pumped RFAs consisting of 15.6 km of dispersion compensating fiber (DCF). The ECL light was square-wave modulated at 500 Hz. At the output of the RFA, the signal of the modulated channel was eliminated with an optical band pass filter, and power fluctuations of the surviving channel were recorded with a high-speed digital oscilloscope. Power fluctuations as high as 0.45 dB with typical saturated amplifier overshoots were observed. The experimental results were confirmed by a large signal numerical analysis.
Keywords :
Raman lasers; band-pass filters; optical fibre amplifiers; optical fibre dispersion; optical fibre filters; optical modulation; optical pumping; optical saturation; transients; 15.6 km; 500 Hz; Raman fiber amplifiers; channel loss effects; counterdirectionally pumped RFAs; cross-gain modulation; dispersion compensating fiber; distributed-feedback laser; external cavity laser; high-speed digital oscilloscope; large signal numerical analysis; modulated channel signal elimination; multiple-access WDM networks; optical band pass filter; saturated amplifier overshoots; square-wave modulation; surviving channel power fluctuations; wavelength routing; Digital modulation; Fiber lasers; Fluctuations; Laser modes; Laser theory; Optical fiber amplifiers; Optical modulation; Performance loss; Pump lasers; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2002.801065
