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Numerical simulations and coherence properties of supercontinuum generation in photonic crystal and tapered optical fibers

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2 Author(s)
Dudley, J.M. ; Lab. d''Opt. P.M. Duffieux, Univ. de Franche-Comte, Besancon, France ; Coen, S.

Numerical simulations have been used to study broad-band supercontinuum generation in optical fibers with dispersion and nonlinearity characteristics typical of photonic crystal or tapered fiber structures. The simulations include optical shock and Raman nonlinearity terms, with quantum noise taken into account phenomenologically by including in the input field a noise seed of one photon per mode with random phase. For input pulses of 150-fs duration injected in the anomalous dispersion regime, the effect of modulational instability is shown to lead to severe temporal jitter in the output, and associated fluctuations in the spectral amplitude and phase across the generated supercontinuum. The spectral phase fluctuations are quantified by performing multiple simulations and calculating both the standard deviation of the phase and, more rigorously, the degree of first-order coherence as a function of wavelength across the spectrum. By performing simulations over a range of input pulse durations and wavelengths, we can identify the conditions under which coherent supercontinua with a well-defined spectral phase are generated

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:8 ,  Issue: 3 )