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15 October 2012 Chirped-pulse propagation and spectral compression in all-normal dispersion photonic crystal fibers
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Based on the generalized nonlinear Schrödinger equation, the femtosecond chirped-pulse propagation and supercontinuum (SC) generation in all-normal dispersion photonic crystal fibers (ANDi PCFs) are numerically investigated. The simulation results show that pre-chirp of the input pulse has a significant effect on the pulse evolution in ANDi PCFs. In the initial stage, up-chirped pulse broadens drastically, non-chirped pulse increases normally, and the spectrum of down-chirped pulse narrows rapidly through self-phase modulation (SPM). The ANDi PCF with smaller absolute value of dispersion (|D|) at the maximum dispersion wavelength (MDW) compresses the spectrum more than that with larger |D| but needs longer fiber as SPM dominate over GVD in it. As ANDi PCF is long enough, the bandwidth of the spectrum depends on the pre-chirp parameter at a fixed peak power. Bigger chirp result in broader spectrum for either up-chirped or down-chirped pulse. Increasing peak power can also enhance the bandwidth of the spectrum, but it is not such useful with largely chirped pulse.
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Ying Li, Jing Hou, and Zongfu Jiang "Chirped-pulse propagation and spectral compression in all-normal dispersion photonic crystal fibers", Proc. SPIE 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy, 84190K (15 October 2012);

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