Influence of Polarization and Pulse Shape of Femtosecond Initial Laser Pulses on Spectral Broadening in Microstructure Fibers

Tianprateep, Montian; Tada, Junji; Kannari, Fumihiko

doi:10.1007/s10043-005-0179-7

Cited by 21 publications

(9 citation statements)

References 23 publications

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“…Therefore, a complete understanding of the corresponding SC generation must rely on the C-GNLSE that takes account of this birefringence, rather than the S-GNLSE that ignores this effect. Ironically, the simulation of the SC generation in nonlinear PCFs has been largely restricted to the S-GNLSE [ 12 ], possibly because the physical insights gained from the C-GNLSE [ 50 , 55 , 56 ] are complicated by a wide selection of fibers and pump lasers [ 50 – 53 ], by the presence of noise [ 55 ], and by the random nature of the birefringence or uncontrolled fiber bending in long fibers [ 57 ].…”

Section: Simulation By Coupled Generalized Nonlinear Schrödinger Ementioning

confidence: 99%

Nonlinear polarization dynamics in a weakly birefringent all-normal dispersion photonic crystal fiber: toward a practical coherent fiber supercontinuum laser

Liu

Liu³

et al. 2012

Opt. Express

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Dispersion-flattened dispersion-decreased all-normal dispersion (DFDD-ANDi) photonic crystal fibers have been identified as promising candidates for high-spectral-power coherent supercontinuum (SC) generation. However, the effects of the unintentional birefringence of the fibers on the SC generation have been ignored. This birefringence is widely present in nonlinear non-polarization maintaining fibers with a typical core size of 2 µm, presumably due to the structural symmetry breaks introduced in the fiber drawing process. We find that an intrinsic form-birefringence on the order of 10−5 profoundly affects the SC generation in a DFDD-ANDi photonic crystal fiber. Conventional simulations based on the scalar generalized nonlinear Schrödinger equation (GNLSE) fail to reproduce the prominent observed features of the SC generation in a short piece (9-cm) of this fiber. However, these features can be qualitatively or semi-quantitatively understood by the coupled GNLSE that takes into account the form-birefringence. The nonlinear polarization effects induced by the birefringence significantly distort the otherwise simple spectrotemporal field of the SC pulses. We therefore propose the fabrication of polarization-maintaining DFDD-ANDi fibers to avoid these adverse effects in pursuing a practical coherent fiber SC laser.

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Section: Simulation By Coupled Generalized Nonlinear Schrödinger Ementioning

confidence: 99%

Nonlinear polarization dynamics in a weakly birefringent all-normal dispersion photonic crystal fiber: toward a practical coherent fiber supercontinuum laser

Liu

Liu³

et al. 2012

Opt. Express

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“…Having said that, the frequency chirp of the input pulse can lead to a delay of nonlinear pulse evolution. The dependence on chirp of various aspects of pulse evolution have been considered previously including the effect on supercontinuum generation [26][27][28][29] and spectral broadening [30,31]. In the latter two papers the influence of chirp on spectral broadening was investigated numerically and experimentally for (50 fs) pulses.…”

Section: Introductionmentioning

confidence: 99%

Few-cycle fiber pulse compression and evolution of negative resonant radiation

McLenaghan

König

2014

New J. Phys.

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We present experimental observations of the spectral expansion of fs-pulses compressing in optical fibers. Using the input pulse frequency chirp we are able to scan through the pulse compression spectra and observe in detail the emergence of negative-frequency resonant radiation (NRR), a recently discovered pulse instability coupling to negative frequencies. We observe how the compressing pulse is exciting NRR as long as it overlaps spectrally with the resonant frequency. Furthermore, we observe that optimal pulse compression can be achieved at an optimal input chirp and for an optimal fiber length. Our measurements are supported by simulations of the compressing pulse propagation. The results are important for Kerr-effect pulse compressors, to generate novel light sources, as well as for the observation of quantum vacuum radiation.

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“…Although in the example presented here SCG is initiated from a fully linearly polarized pulse launched into mode M1, coupling to the orthogonally polarized mode M2 determines the overall polarization properties of the supercontinuum at the fiber output. In the past, the polarization properties of supercontinua generated in weakly and highly birefringent MOFs have been studied both experimentally and numerically [14][15][16][30][31][32]. Thereby, the numerical models were exclusively based on solving the coupled GNLSE with two circularly polarized eigenmodes [14,16,32].…”

Section: Simulation Resultsmentioning

confidence: 99%

“…In the past, the polarization properties of supercontinua generated in weakly and highly birefringent MOFs have been studied both experimentally and numerically [14][15][16][30][31][32]. Thereby, the numerical models were exclusively based on solving the coupled GNLSE with two circularly polarized eigenmodes [14,16,32]. Using the MM-GNLSE allows us to study the nonlinear polarization dynamics in SCG independent of the eigenmode basis.…”

Section: Simulation Resultsmentioning

confidence: 99%

Numerical solver for supercontinuum generation in multimode optical fibers

Khakimov¹,

Shavrin²,

Novotny³

et al. 2013

Opt. Express

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We present an approach for numerically solving the multimode generalized nonlinear Schrödinger equation (MM-GNLSE). We propose to transform the MM-GNLSE to a system of first-order ordinary differential equations (ODEs) that can then be solved using readily available ODE solvers, thus making modeling of pulse propagation in multimode fibers easier. The solver is verified for the simplest multimode case in which only the two orthogonal polarization states in a non-birefringent microstructured optical fiber are involved. Also, the nonlinear dynamics of the degree and state of spectral polarization are presented for this case.

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Influence of Polarization and Pulse Shape of Femtosecond Initial Laser Pulses on Spectral Broadening in Microstructure Fibers

Cited by 21 publications

References 23 publications

Nonlinear polarization dynamics in a weakly birefringent all-normal dispersion photonic crystal fiber: toward a practical coherent fiber supercontinuum laser

Nonlinear polarization dynamics in a weakly birefringent all-normal dispersion photonic crystal fiber: toward a practical coherent fiber supercontinuum laser

Few-cycle fiber pulse compression and evolution of negative resonant radiation

Numerical solver for supercontinuum generation in multimode optical fibers

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