Abstract
Broadband supercontinuum spectra are generated in a microstructured fiber using femtosecond laser pulses. Noise properties of these spectra are studied through experiments and numerical simulations based on a generalized stochastic nonlinear Schrödinger equation. In particular, the relative intensity noise as a function of wavelength across the supercontinuum is measured over a wide range of input pulse parameters, and experimental results and simulations are shown to be in good quantitative agreement. For certain input pulse parameters, amplitude fluctuations as large as 50% are observed. The simulations clarify that the intensity noise on the supercontinuum arises from the amplification of two noise inputs during propagation – quantum-limited shot noise on the input pulse, and spontaneous Raman scattering in the fiber. The amplification factor is a sensitive function of the input pulse parameters. Short input pulses are critical for the generation of very broad supercontinua with low noise.
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42.50.Lc; 42.65.Re; 42.81.Dp; 02.60.Cb
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Corwin, K., Newbury, N., Dudley, J. et al. Fundamental amplitude noise limitations to supercontinuum spectra generated in a microstructured fiber. Appl Phys B 77, 269–277 (2003). https://doi.org/10.1007/s00340-003-1175-x
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DOI: https://doi.org/10.1007/s00340-003-1175-x