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Generation of Bright–Dark Pulse Pairs in the Er-Doped Mode-Locked Fiber Laser Based on Doped Fiber Saturable Absorber

Authors :
Yaoyao Qi
Qixing Yu
Wei Sun
Yaqing Gao
Yu Zhang
Zhenxu Bai
Jie Ding
Bingzheng Yan
Yulei Wang
Zhiwei Lu
Dapeng Yan
Source :
Photonics, Vol 11, Iss 6, p 534 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

Abstract

This study reports new types of passive mode-locked Er-doped fiber laser (EDFL) based on a segment of doped fiber saturable absorber (DFSA) with Tm/Ho-doped fiber (THDF), Yb-doped fiber (YDF), and Er-doped fiber (EDF). By employing THDF-SA, a bright pulse sequence with a fundamental repetition rate of 17.86 MHz was obtained. In addition, various mode-locked output states, including dark pulses, dark–bright pulse pairs, bright–dark pulse pairs, and second-harmonic pulses, were obtained through polarization modulation and gain modulation, and the orthogonality of dark–bright pulses in both polarization directions was verified. Furthermore, using EDF-SA and YDF-SA, dark pulses and dark–bright pulses were obtained. A comparison of the three experiments revealed that THDF-SA effectively reduces the mode-locked threshold and improves the average output power. Compared with bright pulses, dark pulses offer several advantages such as resisting noise, increasing propagation speed, and suppressing nonlinear scattering (such as pulse-intrinsic Raman scattering); thus, the EDFL can find broad application in long-distance transmission, precision measurement, and other fields.

Details

Language :
English
ISSN :
23046732
Volume :
11
Issue :
6
Database :
Directory of Open Access Journals
Journal :
Photonics
Publication Type :
Academic Journal
Accession number :
edsdoj.9a2cd50c2314b819b38be2d3e8e11f4
Document Type :
article
Full Text :
https://doi.org/10.3390/photonics11060534