Numerical modeling and simulations on splitting of chirped optical pulses in heavily doped thulium fiber amplifiers through modal instability analysis

Mohd Mansoor Khan; Ramesh Kumar Sonkar

doi:10.1117/12.2538902

19 November 2019 Numerical modeling and simulations on splitting of chirped optical pulses in heavily doped thulium fiber amplifiers through modal instability analysis

Mohd Mansoor Khan, Ramesh Kumar Sonkar

Author Affiliations +

Proceedings Volume 11195, Quantum and Nonlinear Optics VI; 1119510 (2019) https://doi.org/10.1117/12.2538902
Event: SPIE/COS Photonics Asia, 2019, Hangzhou, China

Abstract

In this paper, mathematical model and simulations displaying the phenomenon of modal instability (MI) in 1050 nm pumped heavily doped Thulium (Tm³⁺) fiber amplifier is presented. Pulse splitting effect through MI with variation in chirp parameter and non-linear fiber length was modeled and simulated. The pulses considered were sech, Gaussian, and super-Gaussian type. Model was computationally solved on MatLab and the results were verified by incorporating similar conditions and parameters on OptiSystem 16 simulation platform. Results concludes the optimum non linear length (L_NL) and the chirp parameter (C = 12) which has to be taken so as to obtain continues time domain pulse train as well as linearly spaced frequency combs. The repetition rate of 500 MHz for 4 ps pulse at 1460 nm with peak sub-pulse energy of 8 nJ was obtained and has been reported to the first time (under MI mechanism) to the authors' knowledge. Optimum TDFA length was concluded as 375 m at which MI phenomenon was triggered.

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Mohd Mansoor Khan and Ramesh Kumar Sonkar "Numerical modeling and simulations on splitting of chirped optical pulses in heavily doped thulium fiber amplifiers through modal instability analysis", Proc. SPIE 11195, Quantum and Nonlinear Optics VI, 1119510 (19 November 2019); https://doi.org/10.1117/12.2538902

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KEYWORDS

Fiber amplifiers

Thulium

Computer simulations

Numerical modeling

Optical amplifiers

Frequency combs

Mathematical modeling

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