Effect of initial frequency chirp on the supercontinuum generation in all-normal dispersion photonic crystal fibers

Chunfu Cheng; Youqing Wang; Qinghua Lv

doi:10.1117/12.916956

25 January 2012 Effect of initial frequency chirp on the supercontinuum generation in all-normal dispersion photonic crystal fibers

Chunfu Cheng, Youqing Wang, Qinghua Lv

Author Affiliations +

Proceedings Volume 8331, Photonics and Optoelectronics Meetings (POEM) 2011: Optical Communication Systems and Networking; 83310O (2012) https://doi.org/10.1117/12.916956
Event: Photonics and Optoelectronics Meetings 2011, 2011, Wuhan, China

Abstract

The effect of initial frequency chirp of input pulses on pulse dynamics and spectral broadening in all-normal dispersion photonic crystal fibers are investigated numerically. When the input peak power is low, for small initial frequency chirp the positive chirps can enhance the bandwidth of supercontinuum while the negative chirps can compress the spectrum. When the initial frequency chirp increases the bandwidth of supercontinuum can be further increased and the spectral broadening is similar for both signs of the initial frequency chirp. Especially, the simulations show that there exists an optimal chirp value that makes the supercontinuum flattest almost without the fine spectral structures. For high input peak power the initial frequency chirps have a little effect on the supercontinuum generation and the significant fine spectral structures appear which makes the coherence of supercontinuum become worse. In addition, the effects of input pulse parameters such as peak power, pulse duration and central wavelength on the supercontinuum generation have also been investigated. It is found that the broadest spectra can be obtained when central wavelength of pump pulse located near the maximum of the fiber dispersion curve.

Citation Download Citation

Chunfu Cheng, Youqing Wang, and Qinghua Lv "Effect of initial frequency chirp on the supercontinuum generation in all-normal dispersion photonic crystal fibers", Proc. SPIE 8331, Photonics and Optoelectronics Meetings (POEM) 2011: Optical Communication Systems and Networking, 83310O (25 January 2012); https://doi.org/10.1117/12.916956

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