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8 January 2008 Tunable narrow-band spectral peak imposed onto a soliton with an acoustic long-period grating
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Abstract
We demonstrate a method of local spectral enhancement of an ultrafast soliton pulse. We use an in-line acoustic long-period grating (LPG), a periodic structure modifying both the phase and the loss of the propagating light, and which is readily tuned by simple adjustment of an applied electrical signal. The soliton perturbed by this narrow-band filter evolves with nonlinear propagation into an intense localised spectral peak. Our setup consists of creation of a red-shifted optical soliton by propagation of pulses from a fibre laser in standard single-mode optical fibre, followed by imposition of a spectrally narrow LPG near to the soliton peak, and then continuing propagation. The wavelength and the peak value of the resulting local enhancement can be tuned by adjustment of the applied acoustic frequency and amplitude. The physics of the observed local spectral enhancement will be discussed in detail here.
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Jeremy A. Bolger, Feng Luan, Dong-Il Yeom, Eduard Tsoy, C. Martijn de Sterke, and Benjamin J. Eggleton "Tunable narrow-band spectral peak imposed onto a soliton with an acoustic long-period grating", Proc. SPIE 6801, Photonics: Design, Technology, and Packaging III, 68010B (8 January 2008); https://doi.org/10.1117/12.761405
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