Dispersion-imbalanced Nonlinear Optical Loop Research Articles

The role of positive pre-chirping on the nonlinear compression of a dual frequency beat signal with a dispersion imbalanced loop mirror

This work provides a detailed numerical analysis on the optimized compression of a dual frequency beat signal to generate a spectrally-enriched short-duration pulse train at 10 and 40 GHz frequencies. The effect of pre-chirping the beat signal on its compression characteristics using a dispersion imbalanced nonlinear optical loop mirror (DI-NOLM) is studied in detail. The output pulse quality is characterized by the shape of the pulse, peak-to-pedestal ratio, spectral content of the pulse and the energy contained in the pulse. It is found that suitable pre-chirping of the beat signal results in better shaping characteristics with significant pedestal suppression. The suitability of the shaped picosecond pulses for further spectral enrichment and the possibility of multi-wavelength generation are also studied.

Spectral-smoothing and pedestal reduction of wavelength tunable quasi-adiabatically compressed femtosecond solitons using a dispersion-flattened dispersion-imbalanced loop mirror

A dispersion-flattened dispersion imbalanced nonlinear optical loop mirror is used to smooth the spectrum and reduce the pedestal of tunable femtosecond solitons generated via pulse compression in a dispersion-flattened dispersion decreasing fiber. Transform-limited pulses with durations less than 210 fs and peak-to-pedestal ratios greater than 40 dB are obtained over a wavelength range of 32 nm at a repetition rate of 10 GHz.