Spatiotemporal analysis of an all-fiber multimode interference-based saturable absorber via a mode-resolved nonlinear Schrodinger equation | Zendy

Guohao Fu | Zendy; Jiading Tian | Zendy; Tiancheng Qi | Zendy; Yulun Wu | Zendy; Ying Zhao | Zendy; Qirong Xiao | Zendy; Dan Li | Zendy; Mali Gong | Zendy; Ping Yan | Zendy

Open Access

Spatiotemporal analysis of an all-fiber multimode interference-based saturable absorber via a mode-resolved nonlinear Schrodinger equation

Author(s) -

Guohao Fu,

Jiading Tian,

Tiancheng Qi,

Yulun Wu,

Ying Zhao,

Qirong Xiao,

Dan Li,

Mali Gong,

Ping Yan

Publication year - 2022

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.471143

Subject(s) - multi mode optical fiber , optics , nonlinear schrödinger equation , ultrashort pulse , fiber laser , saturable absorption , mode volume , single mode optical fiber , interference (communication) , materials science , fiber , optical fiber , nonlinear system , physics , laser , plastic optical fiber , telecommunications , computer science , quantum mechanics , channel (broadcasting) , composite material

This paper presents an approach that combines the generalized multimode nonlinear Schrodinger equation with a transmission model to analyze spatiotemporal characteristics of multimode interference in single mode/large mode area fiber-graded-index multimode fiber-single mode fiber (SMF/LMA-GIMF-SMF) structures for the first time. Approximated self-imaging (ASIM) behavior in GIMF and the study of the latter structure used in spatiotemporal mode-locked fiber lasers are first demonstrated. Simulations show that these structures can work as saturable absorbers enabling high-energy pulse output due to nonlinear intermodal interactions and intensity-dependent multimode interference. Otherwise, underlying ASIM is proven that it can perturb the transmission of SMF/LMA-GIMF-SMF, causing instability of their saturable-absorption characteristics. This paper provides a theoretical guide for many applications, such as beam shaping, mode conversion, and high-energy ultrafast fiber laser.

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