Modulation instability analysis in a birefringence FBG structure driven by compete nonlinearities and trapping potential

IF 3.1 3区物理与天体物理 Q2 Engineering

Optik Pub Date : 2025-10-11 DOI:10.1016/j.ijleo.2025.172553

Ilanchezhiyan Inbavalli , Murugan Senthil Mani Rajan , Thangavel Alagesan , Kumarappa Subramanian

{"title":"Modulation instability analysis in a birefringence FBG structure driven by compete nonlinearities and trapping potential","authors":"Ilanchezhiyan Inbavalli , Murugan Senthil Mani Rajan , Thangavel Alagesan , Kumarappa Subramanian","doi":"10.1016/j.ijleo.2025.172553","DOIUrl":null,"url":null,"abstract":"<div><div>In this paper, we investigate modulation instability (MI) in a coupled nonlinear Schrödinger (NLS) system incorporating quintic nonlinearity and gain/loss parameters, using linear stability analysis (LSA). The model is designed to describe the dynamics of nonlinear wave propagation in non-Kerr birefringent media and fiber Bragg grating (FBG) structures. By employing two-dimensional and three-dimensional representations, we analyze the influence of various system parameters – including nonlinear coupling terms and amplification coefficients – on the shape, bandwidth, and location of the MI gain spectra. The results provide insights into how these parameters control the onset and evolution of instability in periodic nonlinear media. This theoretical prediction offers valuable guidance for the experimental realization of MI in nonlinear periodic structures, such as fiber Bragg gratings and photonic crystal fibers, and contributes to the advancement of instability-based applications in nonlinear photonics.</div></div>","PeriodicalId":19513,"journal":{"name":"Optik","volume":"340 ","pages":"Article 172553"},"PeriodicalIF":3.1000,"publicationDate":"2025-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optik","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0030402625003419","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"Engineering","Score":null,"Total":0}

引用次数: 0

Abstract

In this paper, we investigate modulation instability (MI) in a coupled nonlinear Schrödinger (NLS) system incorporating quintic nonlinearity and gain/loss parameters, using linear stability analysis (LSA). The model is designed to describe the dynamics of nonlinear wave propagation in non-Kerr birefringent media and fiber Bragg grating (FBG) structures. By employing two-dimensional and three-dimensional representations, we analyze the influence of various system parameters – including nonlinear coupling terms and amplification coefficients – on the shape, bandwidth, and location of the MI gain spectra. The results provide insights into how these parameters control the onset and evolution of instability in periodic nonlinear media. This theoretical prediction offers valuable guidance for the experimental realization of MI in nonlinear periodic structures, such as fiber Bragg gratings and photonic crystal fibers, and contributes to the advancement of instability-based applications in nonlinear photonics.

查看原文本刊更多论文

竞争非线性和俘获势驱动下双折射光纤光栅结构的调制不稳定性分析

本文利用线性稳定性分析（LSA）研究了一个包含五次非线性和增益/损失参数的耦合非线性Schrödinger （NLS）系统的调制不稳定性（MI）。该模型旨在描述非线性波在非克尔双折射介质和光纤布拉格光栅（FBG）结构中的传播动力学。通过二维和三维表示，我们分析了各种系统参数（包括非线性耦合项和放大系数）对MI增益谱的形状、带宽和位置的影响。研究结果揭示了这些参数如何控制周期性非线性介质中不稳定性的发生和演化。这一理论预测为非线性周期结构（如光纤Bragg光栅和光子晶体光纤）中MI的实验实现提供了有价值的指导，并有助于推进非线性光子学中基于不稳定性的应用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Optik 物理-光学

CiteScore

6.90

自引率

12.90%

发文量

1471

审稿时长

46 days

期刊介绍： Optik publishes articles on all subjects related to light and electron optics and offers a survey on the state of research and technical development within the following fields: Optics: -Optics design, geometrical and beam optics, wave optics- Optical and micro-optical components, diffractive optics, devices and systems- Photoelectric and optoelectronic devices- Optical properties of materials, nonlinear optics, wave propagation and transmission in homogeneous and inhomogeneous materials- Information optics, image formation and processing, holographic techniques, microscopes and spectrometer techniques, and image analysis- Optical testing and measuring techniques- Optical communication and computing- Physiological optics- As well as other related topics.