Increased amplifier spacing in a soliton system with quantum-well saturable absorbers and spectral filtering

Four-wave mixing between a soliton and noise in a system with large amplifier spacing.

Depletion of soliton energy by four-wave mixing between a soliton and amplifier noise in a system with 100-km amplifier spacing is studied. Dispersion exponentially decreasing fiber is used as transmission fiber. Improvement of the system by the use of a sliding-frequency filter to reduce noise power and the depletion of soliton energy is shown. The system can be further improved by compensatio...

Passive mode-locking in semiconductor lasers with saturable absorbers bandgap shifted through quantum well intermixing

Phosphorene quantum dot saturable absorbers for ultrafast fiber lasers

We fabricate ultrasmall phosphorene quantum dots (PQDs) with an average size of 2.6 ± 0.9 nm using a liquid exfoliation method involving ultrasound probe sonication followed by bath sonication. By coupling the as-prepared PQDs with microfiber evanescent light field, the PQD-based saturable absorber (SA) device exhibits ultrafast nonlinear saturable absorption property, with an optical modulatio...

Ultrafast dynamics in field-enhanced saturable absorbers

Absorption recovery dynamics of GaAs/AlGaAs field-enhanced waveguide saturable absorbers-are studied by pump-probe differential transmission measurements. We c;ompare the response of-bulk and single quantum well absorbers at different reverse bias levels and pump powers, and find an ultrafast transient in the response, followed by a slower rise before the final recovery. The absorption fully re...

Stability analysis of a laser with two modulated saturable absorbers

The stability analysis of a model for a laser system with two modulated saturable absorbers, each one modulated at a different frequency, is performed. The model is based on four equations describing the temporal evolution of the photon flux, the population inversion in the active media, and the saturation coefficients of each saturable absorber. The system dynamics is discussed in order to fin...