Fm mode-locking fiber laser

الملخص EN

In this paper the study of Frequency Modulation Harmonic Mode-locking for Ytterbium Doped Fiber Laser is presented.

The model studied, uses ytterbium-doped, single mode fiber pumped by 976 nm laser source is used with 150 mW pumping power to produce 1055 nm output laser and Frequency Modulation Harmonically Mode-Locked by MZI optical modulator.

The effect of both normal and anomalous dispersion regimes on output pulses is investigated.

Also, modulation frequency effect on pulse parameters is investigated by driving the modulator into different frequencies values.

This study shows the stability of working in anomalous dispersion regime and the pulse compression effect is better than counterpart normal regime, due to the combination effect of both negative (Group velocity dispersion), GVD and nonlinearity.

Also it shows the great effect of modulation frequency on pulse parameters and stability of the system.

Model-locking fiber laser master equation is introduced, and using the assumed pulse shapes for both dispersion regimes after modifying (Ginzburg-Landau equation), GLE and by applying the moment method, a set of five ordinary differential equations are introduced describing pulse parameters evolution during each roundtrip.To solve these equations numerically using fourth- fifth order, Runge-Kutta method is performed through MatLab 7.0 program.