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BRIEF RESEARCH REPORT article

Front. Phys.
Sec. Optics and Photonics
Volume 12 - 2024 | doi: 10.3389/fphy.2024.1479206

New method for investigation of mode coupling in graded-index polymer photonic crystal fibers using the Langevin stochastic differential equation

Provisionally accepted
Svetislav Savovic Svetislav Savovic 1*ALEXANDAR DJORDJEVICH ALEXANDAR DJORDJEVICH 2Konstantinos Aidinis Konstantinos Aidinis 3Chen Chen Chen Chen 4Rui Min Rui Min 5
  • 1 University of Kragujevac, Kragujevac, Serbia
  • 2 City University of Hong Kong, Kowloon, Hong Kong, SAR China
  • 3 Ajman University, Ajman, Ajman, United Arab Emirates
  • 4 Chongqing University, Chongqing, China
  • 5 Beijing Normal University, Zhuhai, Zhuhai, Guangdong Province, China

The final, formatted version of the article will be published soon.

    The mode coupling in a graded-index polymer photonic crystal fiber (GI PPCF) with a solid core has been investigated by means of the Langevin equation. Based on the computer-simulated Langevin force, the Langevin equation is numerically integrated. The Langevin equation's numerical solution and the time-independent power flow equation's (TI PFE) numerical solution agree. We have shown that by solving the Langevin equation which is a stochastic differential equation, one can successfully treat a mode coupling in GI PPCFs, which is intrinsically stochastic process. We have demonstrated that, in terms of effectiveness, the Langevin equation is preferable compared to TI PFE. The GI PPCF achieves the equilibrium mode distribution (EMD) at a coupling length that is even shorter than the conventional GI plastic optical fiber (POF). The application of multimode GI PCFs in communications and optical fiber sensor systems will benefit from these findings.

    Keywords: Photonic crystal fiber, Plastic optical fiber, Langevin equation, Optical power flow, Graded index optical fiber

    Received: 11 Aug 2024; Accepted: 26 Aug 2024.

    Copyright: © 2024 Savovic, DJORDJEVICH, Aidinis, Chen and Min. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Svetislav Savovic, University of Kragujevac, Kragujevac, Serbia

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