Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 23, Issue 2, Pages 855-863Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2004.838873
Keywords
femtosecond; finite-difference time domain (FDTD); generalized nonlinear Schrodinger equation (GNLSE); monocycle optical pulse; nonlinear chirp; nonlinear fiber optics; nonlinear propagation; Raman; self-phase modulation; self-steepening; Sellmeier; silica fiber; slowly varying envelope approximation (SVEA); spatial phase modulator (SPM); spatial light modulator (SLM); ultra-broad-band spectrum
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Conventionally, the beam-propagation method for solving the generalized nonlinear Schrodinger equation, including the slowly varying envelope approximation, has been used to describe the ultrashort-laser-pulse propagation in an optical fiber. However, if the pulse duration approaches the optical cycle regime (<10 fs), this approximation becomes invalid. Then, it becomes necessary to use the finite-difference time-domain (FDTD) method for solving the Maxwell equation with the least approximation. In order to both experimentally and numerically investigate nonlinear femtosecond ultra-broad-band-pulse propagation in a silica fiber, the FDTD calculation of Maxwell's equations has been extended with nonlinear terms to that including all exact Sellmeier-fitting values. The results of this extended FDTD method are compared with experimental results for the nonlinear propagation of a very short (12-fs) chirped laser pulse in a silica fiber. The fiber output pulse compressed to 7 fs by the simulation of group-delay compensation was obtained under the assumption of using a spatial light modulator. To the authors' knowledge, this is the first comparison between FDTD calculation and experimental results for nonlinear propagation of a very short (12-fs) chirped pulse in a silica fiber.
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