Title :
Simultaneous amplification and channel equalization using Raman amplifier for 30 channels in 1.3-μm band
Author :
Seo, H.S. ; Oh, K. ; Paek, U.C.
Author_Institution :
Dept. of Inf. & Commun., Kwangju Inst. of Sci. & Technol., South Korea
fDate :
3/1/2001 12:00:00 AM
Abstract :
A new technique is proposed to simultaneously amplify signals and equalize power unbalance caused by Raman-induced crosstalk among optical channels in the 1.3-μm band. The crosstalk is induced in GeO2 -doped silica fibers due to the Raman-gain coefficient with a positive slope below the peak-frequency shift of 440 cm-1. Highly doped GeO2 silica fiber, however, shows a negative slope across the band between 440 cm-1 and 490 cm-1. We propose expansion of the Raman-gain band with a negative slope over the bandwidth of 150 cm-1 using multiple pumps. Utilizing the negative gain slope of the proposed band, simultaneous amplification and power equalization was theoretically demonstrated for 30 channels in the 1.310-1.345 μm region without external filters
Keywords :
Raman lasers; equalisers; germanate glasses; optical communication equipment; optical crosstalk; optical fibre amplifiers; optical pumping; telecommunication channels; wavelength division multiplexing; 1.3 mum; 1.31 to 1.345 mum; GeO2-doped silica fibers; Raman amplifier; Raman-gain band; Raman-gain coefficient; Raman-induced crosstalk; channel equalization; highly doped GeO2 silica fiber; multiple pumps; negative gain slope; negative slope; optical channels; peak-frequency shift; positive slope; power equalization; power unbalance; simultaneous amplification; Broadband amplifiers; Crosstalk; Optical amplifiers; Optical fiber amplifiers; Optical fibers; Optical filters; Semiconductor optical amplifiers; Silicon compounds; Stimulated emission; Wavelength division multiplexing;
Journal_Title :
Lightwave Technology, Journal of
