Abstract

A slightly tapered graded index multimode fiber (GIMF) is demonstrated as the saturable absorber (SA) for a conventional soliton and tightly bound soliton generation. The SA device is simply a GIMF spliced with single-mode fiber (SMF) at its two ends. The waist diameter of the slightly tapered fiber is ${\sim}{23.8}\;\unicode{x00B5}{\rm m}$, located at one of the splicing points of SMF and GIMF. The mode-locked output of conventional solitons and tightly bound solitons can be obtained in a ring fiber laser based on such a SA. The central wavelength of the output conventional solitons is 1563.5 nm, and the pulse width is as short as 473 fs at the fundamental frequency of 19.53 MHz. The central wavelength of the tightly bound solitons is 1563.5 nm, with a pulse width of 636 fs and a separation of 1.89 ps. The device is featured with a simple and robust structure and stable operation capability and can effectively overcome the difficulty in requirement of precise control of the GIMF length, which make it attractive in ultrafast lasers and optical fiber communication systems.

© 2023 Optica Publishing Group

All-normal-dispersion dissipative soliton fiber laser using an offset-splicing graded-index-multimode-fiber-based saturable absorber

Wei Pan, Liang Jin, Jiazhu Wang, Renyan Wang, He Zhang, Xu Yingtian, Xin Zhao, Yang Li, and Xiaohui Ma
Appl. Opt. 60(4) 923-928 (2021)

Graded index fiber as an all-fiber saturable absorber for large energy conventional soliton and dissipative soliton generation

Zhaokun Wang, Jikai Chen, Tianyu Zhu, D. N. Wang, and Feng Gao
Photon. Res. 7(11) 1214-1220 (2019)

Observation of controllable tightly and loosely bound solitons with an all-fiber saturable absorber

Tianyu Zhu, Zhaokun Wang, D. N. Wang, Fan Yang, and Liujiang Li
Photon. Res. 7(1) 61-68 (2019)

Multistate transformations of a femtosecond fiber laser based on a pure fiber saturable absorber

Qianchao Wu, Lifang Chen, Zheng Wu, and Yong Yao
Appl. Opt. 60(25) 7821-7827 (2021)

Hybrid structure based on no-core and graded-index multimode fibers as saturable absorber for a self-starting mode-locked Yb-doped fiber laser

S. Thulasi and S. Sivabalan
Appl. Opt. 59(24) 7357-7363 (2020)