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Modulation Instability in Decreasing Dispersion Fibers

Xu Wencheng Luo Aiping Guo Qi Liu Songhao ( Institute of Quantum Electronics,South China Normal University,Guangzhou 5 1 0 6 31 )  
Modulation instability in decreasing dispersion fibers (DDF) is investigated by meansof theoretical analysis and numerical simulation.The gain spectrum of modulation instability is obtained as a function of axially- varying dispersion parameter.The results show thatthe gain spectrum of DDF is much broader than that of ordinary optical fibers.The broad gain bandwidth can be obtained by selecting the dispersion parameter of DDF. The numerical simulation also shows that fundamental soliton pulses with high repetition rate can be generated in this kind of fiber by modulation instability.
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