We propose and numerically demonstrate a novel simple method to produce optical Nyquist pulses based on pulse shaping in a passively mode-locked fiber laser with an in-cavity flat-top spectral filter. The proposed scheme takes advantage of the nonlinear in-cavity dynamics of the laser and offers the possibility to generate high-quality sinc-shaped pulses with widely tunable bandwidth directly from the laser oscillator. We also show that the use of a filter with a corrective convex profile relaxes the need for large nonlinear phase accumulation in the cavity by offsetting the concavity of the nonlinearly broadened pulse spectrum.
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Funding: Leverhulme Trust (Grant RPG-278); and EPSRC Program Grant UNLOC under Grant EP/J017582/1.
- mode-locked fiber lasers
- nonlinear fiber optics
- frequency filtering
- pulse shaping