Soliton collision and Raman gain regimes in continuous-wave pumped supercontinuum generation

Abstract

Abstract:We numerically investigate supercontinuum generation using continuous-wave pumping. It is found that energy transfer during collision of solitons plays an important role. The relative influence of Raman gain on spectral broadening is shown to depend on the width of the calculation time window. Our results indicate that increasing the spectral linewidth of the pump can decrease the supercontinuum spectral width. Using a fiber with smaller dispersion at the pump wavelength reduces the required fiber length by decreasing the temporal width of the solitons formed from modulation instability. This also reduces the sensitivity to the pump spectral linewidth. Verlag, New York, 2005). ISBN 0-387-24504-9. 2. J. K. Ranka, R. S. Windeler, and A. J. Stentz, "Visible continuum generation in air-silica microstructure optical fibers with anomalous dispersion at 800 nm," Opt. Lett. 25, 25-27 (2000). 3. K. M. Hilligsøe, T. V. Andersen, H. N. Paulsen, C. K. Nielsen, K. Mølmer, S. Keiding, R. Kristiansen, K. P. Hansen, and J. J. Larsen, "Supercontinuum generation in a photonic crystal fiber with two zero dispersion wavelengths," Opt. Express 12, 1045-1054 (2004). http://www.opticsexpress.org/abstract.cfm?URI=OPEX-12-6-1045. 4. G. Genty, M. Lehtonen, H. Ludvigsen, and M. Kaivola, "Enhanced bandwidth of supercontinuum generated in microstructured fibers," Opt. Express 12, 3471-3480 (2004 25, 2665-2673 (1989 423-444 (1996).http://link.aps.org/abstract/RMP/v68/p423. 35. A. Peleg, M. Chertkov, and I. Gabitov, "Interchannel interaction of optical solitons," Phys. Rev. E 68, 026605 (2003). http://link.aps.org/abstract/PRE/v68/e026605. 36. S. Chi and S. Wen, "Raman cross talk of soliton collision in a lossless fiber," Opt. Lett. 14, 1216-1218 (1989 4143-4152 (1996). http://link.aps.org/abstract/PRE/v53/p4143. 40. J. K. Lucek and K. J. Blow, "Soliton self-frequency shift in telecommunications fiber," Phys. Rev. A 45, 6666-6674 (1992). http://dx

Experimental Study on the Role of Chromatic Dispersion in Continuous-Wave Supercontinuum Generation

“…Besides, when DWs are radiated by fundamental solitons from higher-order soliton fission, a maximum of intensity should appear at the blue edge of the spectrum [30], [32], which is not our case. Instead, our results are consistent with theoretical predictions for which in CW-pumping regimes fundamental solitons of slightly different amplitude and time duration originate from phase noise of the pump due to MI [11], [12], [14]. Immediately after formation they release non-solitonic radiation in the presence of higherorder dispersion and continue to radiate some energy while Raman red-shifting until stability is reached.…”

“…Some new effect other than soliton fission have to be taken into account. For this reason, our results seem to be in very good agreement with the latest theoretical studies that attribute to soliton collisions a significant role in enhancing the spectral width by leading to shorter soliton formation [14]. Moreover, new results have been published that reveal the influence of statistical processes on enhanced spectral broadening because of the generation of rare extremely red-shifted solitons [39], [40].…”

“…The process of converting a CW laser emission into supercontinuum in optical fibers has been studied intensively in the last years, both experimentally [5], [6], [7], [8], [9], [10] and theoretically [11], [12], [13], [14]. These studies have shown that CW SC sources are initiated by modulation instability (MI) of the partially coherent input beam, which can lead to soliton formation and collision processes [15], [14].…”

“…These studies have shown that CW SC sources are initiated by modulation instability (MI) of the partially coherent input beam, which can lead to soliton formation and collision processes [15], [14]. Then, the Raman scattering induces a self-frequency downshift of the generated solitons, so that their final spectral distribution covers a wide wavelength range.…”

Collision of Akhmediev Breathers in Nonlinear Fiber Optics

“…Collision between emerging breather structures from waves undergoing modulation instability also appears to be a precursor to the formation of rogue soliton pulses in the process of supercontinuum generation [22]. More generally, collision processes between solitons are known to play an important role in the generation of a supercontinuum [23,24] and the formation of rogue solitons [25] in quasicontinuous-wave pumped-fiber systems.…”