Supercontinuum generation by higher-order mode excitation in a photonic crystal fiber

We describe an experiment in which a train of femtosecond pulses is coupled into a photonic crystal fiber (PCF) by means of an offset pumping technique that can selectively excite either the mode LP(01) or LP(11) or LP(21). The PCF presents a wide range of wavelengths in which the fundamental mode e...

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Bibliographic Details
Published in:Optics express 2008-02, Vol.16 (3), p.2147-2152
Main Authors: Cherif, R, Zghal, M, Tartara, L, Degiorgio, V
Format: Article
Language:English
Subjects:
Computer Simulation
Computer-Aided Design
Crystallization - methods
Energy Transfer
Equipment Design
Equipment Failure Analysis
Fiber Optic Technology - instrumentation
Lighting - methods
Models, Theoretical
Quantum Theory
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Summary:We describe an experiment in which a train of femtosecond pulses is coupled into a photonic crystal fiber (PCF) by means of an offset pumping technique that can selectively excite either the mode LP(01) or LP(11) or LP(21). The PCF presents a wide range of wavelengths in which the fundamental mode experiences normal dispersion, whereas LP(11) and LP(21) propagate in the anomalous dispersion regime, generating a supercontinuum based on the soliton fission mechanism. We find that the existence of a cut-off wavelength for the higher-order modes makes the spectral broadening asymmetrical. This latter effect is particularly dramatic in the case of the LP(21) mode, in which, by using a pump wavelength slightly below cut-off, the spectral broadening occurs only on the blue side of the pump wavelength. Our experimental results are successfully compared to numerical solutions of the nonlinear Schrödinger equation.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.16.002147