Roy, Samudra and Bhadra, Shyamal Kumar and Agrawal, Govind P (2011) Dispersive wave generation in supercontinuum process inside nonlinear microstructured fibre. Current Science, 100 (3). pp. 321-342. ISSN 0011-3891

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The presence of higher order dispersion leads to the transfer of energy from soliton to dispersive waves (DWs: also called non-solitonic radiation), which play a significant role in blue-component generation in the supercontinuum (SC) process. The frequency of DWs is controlled by the general phase-matching condition requiring that DWs propagate with the same phase velocity as that of the soliton. In the present study, the generation of DWs in the SC process inside the nonlinear microstructured fibre/photonic crystal fibre is explored under different operational conditions. The role of third, fourth and other higher order dispersions on the generation and control of DWs is described using numerical solution of generalized nonlinear Schrodinger equation. The study reveals several important facts such as all positive, even-order dispersion terms always generate dual radiation and all odd-order dispersion produces single radiation. Even the numeric sign of the dispersion coefficient modulates the non-solitonic radiations dramatically. A more general study unfolds that dispersion profile of a specific fibre can control the generation of DWs; in fact, the zero dispersion points turn out to be excellent predictors of the number of radiation peaks being generated. It is also demonstrated that with proper tailoring of dispersion profile of nonlinear medium, it is possible to generate dual radiation in the same side of the input pulse in frequency domain. Here we have considered the case of a highly nonlinear photonic crystal optical fibre. Further, it is observed that DWs can still be generated when the pump frequency falls on the normal dispersion domain. Finally the validity of the proposed theory is established through experimental verification.

Item Type: Article
Uncontrolled Keywords: Dispersive waves; optical solitons; photonic crystal fibres; supercontinuum generation
Subjects: Microstructure and Characterization
Divisions: Fiber Optics and Photonics
Depositing User: Bidhan Chaudhuri
Date Deposited: 17 Jan 2012 11:17
Last Modified: 21 Nov 2012 06:18

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