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DTU Fotonik Colloquia
Titel: Nonlinear polarization dynamics in a weakly birefringent all-normal dispersion photonic crystal fiber : toward a practical coherent fiber supercontinuum laser
Type: Journal articleJournal article
Person(er):
Forfatter:  Tu, Haohua
University of Illinois, Beckman Institute for Advanced Science and Technology

Forfatter:  Liu, Yuan
University of Illinois, Beckman Institute for Advanced Science and Technology

Forfatter:  Liu, Xiaomin (Cwisno: 45484)
Technical University of Denmark
Email:

Forfatter:  Turchinovich, Dmitry (Cwisno: 37348)
Technical University of Denmark
Email:

Forfatter:  Lægsgaard, Jesper (Cwisno: 6065)
Technical University of Denmark
Email:

Forfatter:  Boppart, Stephen A.
University of Illinois, Beckman Institute for Advanced Science and Technology
Uddrag: 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.
Publiceret: in journal: Optics Express (ISSN: 1094-4087) (DOI: http://dx.doi.org/10.1364/OE.20.001113), vol: 20, issue: 2, pages: 1113-1128, 2012
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