Abstract
A theoretical model is established to study the self-similar pulses in nonlinear polarization evolution (NPE) mode-locked fiber lasers. The propagation of pulse in single mode fibers and gain fibers are described by coupled Ginzburg- Landau equation (GLE). Two wave plates and a polarizer are considered to realize the NPE mechanism in simulation. This model describes the laser completely and provides some useful pulses' information. In our simulation the laser generates high quality self-similar pulses output. The region of steady self-similar pulses operation is found. The polarization states of different parts across the pulse are simulated along the laser cavity. It is found that polarization states across the pulse are modulated from elliptical to almost circular before the pulse passing through the polarizer.
Highlights
Passive mode-locking fiber lasers have many advantages such as high stability, ultrashort pulse width, simple structure and compact size
A theoretical model is established to study the self-similar pulses in nonlinear polarization evolution (NPE) mode-locked fiber lasers
The propagation of pulse in single mode fibers and gain fibers are described by coupled Ginzburg- Landau equation (GLE)
Summary
Passive mode-locking fiber lasers have many advantages such as high stability, ultrashort pulse width, simple structure and compact size. The NPE mode-locked fiber lasers can work in several regimes: stable soliton, stretched-pulse, all-normal-dispersion pulses and self-similar pulse by adjusting parameters in the cavity. For stable soliton fiber lasers the energy of a single pulse is limited by the nonlinear phase shift induced by the high peak power. A number of theoretical models for simulating the NPE mode-locked fiber lasers have been established. These models are widely used in studying the solitons in fiber lasers. We propose a self similar fiber laser model utilizing NPE mode locking to simulate the pulse evolution and polarization states. These simulation results agree with the former models and provide more pulses’ information such as polarization states
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