Investigation of the pulse dynamics in fiber lasers

• Main Author: Xu, Huining
• Other Authors: Wang Wijie
• Format: Final Year Project
• Language: English
• Published: 2015
• Subjects: DRNTU::Engineering
• Online Access: http://hdl.handle.net/10356/62044
• Institution: Nanyang Technological University

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.