Abstract
The fission of N-solitons is a key mechanism leading to the supercontinuum generation and creation of hyper-compressed pulses and solitons featuring strong wavelength tuning [1, 2]. Recent advances in manufacturing PCFs filled with Raman-inactive gases [3] provide a strong motivation to focus the studies on the fission driven by the third-order dispersion (TOD) [4], and potential applications of this setting to photonics. In the absence of the Raman-induced self-frequency shift and the Raman-associated noise, fission-produced strongly compressed solitons, once generated, may propagate keeping constant internal frequencies. A higher-order N-soliton, u =NP0sech(T/T0) is launched into the fiber, where T0 and P0 are width and peak power of the corresponding fundamental soliton. If the TOD dispersion β3 is very small, it can be considered as a perturbation added to the second-order dispersion, β2. In this case, the peak power of each fundamental soliton emerging after the splitting of the N-soliton is given by the classical result, Pj = P0(2N − 2j + 1)2 [5]. If β3 is larger, it leads to a significant increase in the largest fundamental-soliton's peak power and compression degree, along with the increase of the wavelength shift. However, further increase of β3 leads to a loss of the peak-power enhancement. For optimal pulse compression and wavelength conversion, universal optimal value of TOD strength parameter δ3 ≡ β3/(6β2T0) was found. This optimal value is valid for any pulse duration, second- and third-order dispersion coefficients, depending solely on order N of the injectedsoliton (Fig. 1(a)). The optimal pulse-compression degree significantly exceeds the well-known analytical prediction [5], as shown in Figs. 1(b, d).
© 2013 IEEE
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