Authors
Abstract
In this work, Aِmplitude modulation mode-locked fiber laser is
studied,by using Ytterbium Doped Fiber Laser, single mode fiber,
operating with 1055 nm wavelength with 976 nm optical pump and AM
Mode-Locked by optical modulators. A grating pair is used to compensate
the normal dispersion. The effect of both normal and anomalous dispersion
regimes on output pulses are investigated. Master equation of the Modelocking
fiber laser is introduced .Pulse shapes for both dispersion regimes
are assumed after modifying (Ginzburg-Landu equation) GLE which is
essentially Generalized Nonlinear Schrödinger equation GNLSE and by
applying the moment method ,a set of five rate equations for pulse energy
,pulse width ,frequency shift ,temporally shift and chirp ,which solutions
described the pulse from round trip to the next and how they approach to
steady state values. To solve these equations numerically fourth order,
Runge-Kutta method is performed through Mat-Lab 7.0 computer program.
Result shows that, the output pulse width from the AM mode-Locked
equals to τ=0.8ps in anomalous and τ=1ps in normal regimes. The study
shows the stability of working in anomalous dispersion regime is better
than normal regime.
Keywords
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