Self-similar pulsed erbium doped fiber laser in femtosecond

Abstract

The laser is composed of following parts connected through general optical fiber: laser pump source, wavelength division multiplexing coupler, ytterbium doped optical fiber, dispersion decrescent optical fiber with positive GVD, output coupler, mode-locking device of polarization rotation, compensating device for chatter pulse. The mode-locking device of polarization rotation includes polarization controller, isolator and polarization adjuster. The compensating device for chatter pulse consists of Bragg grating of optical fiber, and Faraday mirror. The invention can generate high energy, high power light pulse in femtosecond level, low cost, near to transform limit, with no base seat, and without chatter. The invention is applicable to optical fiber communication, nonlinear optics, super quick optics, and transient state optics widely.

Description

(1) Technical field [0001] The invention relates to a self-similar femtosecond pulsed erbium-doped fiber laser, which belongs to the cross technical field of nonlinear fiber optics and fiber communication. (2) Background technology [0002] In recent years, the generation and transmission of high-power optical pulse lasers with strict linear chirp characteristics has become one of the hotspots in the field of fiber optics research in the world. In the positive dispersion region of the fiber, the optical pulse with gain will evolve into a parabolic pulse, which is called a self-similar optical pulse in the field of nonlinear optics research. Mathematically, the parabolic self-similar optical pulse is the self-similar solution of the nonlinear Schrödinger equation (NLSE) with gain in the positive dispersion region of the fiber. Ordinary optical solitons (produced in the negative dispersion region of the fiber) will produce light wave splitting when the power is increased, so ...

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Problems solved by technology

Subsequently, F. .Ilday, F.W.Wise and F.X.Kaertner (F. .Ilday, F.W.Wise, and F.X.Kaertner, Possibility of Self-similar pulse Evolution in a Ti: sapphirelaser, Opt.Express, 2004, 12(12): 2731-2738.) Possibility of Self-similar pulse Evolution in a Ti:sapphire laser Theoretical analysis has been carried out, but there is no relevant experimental report, and the titanium sapphire laser is expensive

C.Finot et al. (C.Finot, S.Pitois, and G.Millot, Regenerative40Gbit / s Wavelength Converter Based on Similarariton Generation, Opt.Lett, 2005, 30(14): 1776-1778.) designed with all-optical devices The experimental setup of the self-similar pulsed laser is too complex

Therefore, in experiments, there is no ordinary optical device that can be really applied so far, and the self-similar pulse can be obtained through a stable feedback cavity and a relatively mature pulse mode-locking technology.

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