Investigation of the pulse dynamics in fiber lasers

Abstract

Nowadays fiber laser has been used in many fields including material processing,

telecommunications, spectroscopy, medicine and directed energy weapons [1].

One of the most common used designs for fiber laser is mode-locked fiber laser. It is

able to generate ultra-short pulse via active or passive mode locking. In this paper we

will make use of this mode-locked fiber laser with nonlinear polarization rotation

technique to do some numeric simulation and experiment measurements.

Ultra-short pulse is the pulse generated by the optical fiber and it has attracted many

attentions in recent years. Self-similar pulse is a kind of ultra-short pulse. It is a live

solution for the Nonlinear Schrodinger Equation. In our numerical simulation we will

use split step method to solve the nonlinear Schrodinger equation and generate a

pulse with self-similarity property.

For the theory part we will introduce some concepts of nonlinear fiber optics basic

parameters. For simulation part we use Matlab to simulate pulse transmission inside

the mode lock fiber laser. Through this numeric result we can found out some

specific characteristics of the self-similar pulse. Lastly we will use experiment to

verify and measure the spectrum and waveform of a mode lock fiber laser.