在渐变折射率环形芯光纤中产生具有扩展带宽和更高纯度的超连续谱。

Supercontinuum generation with extended bandwidth and improved purity in graded-index ring-core fiber.

作者信息

Peng Qinru, Yang Jian, Zhang Yiwen, Liu Yuanpeng, Fang Yuxi, Geng Wenpu, Pan Zhongqi, Yang Fei, Yue Yang

机构信息

School of Information and Communications Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.

Institute of Modern Optics, Nankai University, Tianjin, 300350, China.

出版信息

Sci Rep. 2024 Dec 4;14(1):30249. doi: 10.1038/s41598-024-80241-4.

DOI:10.1038/s41598-024-80241-4

PMID:39632861

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11618691/

Abstract

In this paper, we numerically investigate the impact of shape factor (k) on the mode properties of graded-index ring-core fiber (GIRCF). A 50 mol% Ge-doped GIRCF with shape factor of 2 is devised to generate supercontinuum (SC) carrying orbital angular momentum (OAM) modes, which possesses flat dispersion with a minor variation of < ± 30 ps/nm/km from 1090 to 2590 nm. The generated supercontinuum (SC) in the designed GIRCF carrying OAM mode covers 2305-nm wavelength range from 750 to 3055 nm at - 40 dB level. The graded refractive index profile (RIP), introduced as a new parameter, offers an additional dimension for the design of ring-core fiber (RCF) supporting OAM modes. The graded RIP contributes to the creation of flat and near-zero dispersion in the RCF structures and reduces the spin-orbit coupling (SOC) effect at the material boundary, leading to broader spectral coverage and higher mode purity in the output spectra.

摘要

在本文中，我们通过数值方法研究了形状因子（k）对渐变折射率环形芯光纤（GIRCF）模式特性的影响。设计了一种形状因子为2的50 mol%掺锗GIRCF，以产生携带轨道角动量（OAM）模式的超连续谱（SC），该光纤在1090至2590 nm范围内具有平坦色散，变化小于±30 ps/nm/km。在设计的携带OAM模式的GIRCF中产生的超连续谱（SC）在-40 dB水平下覆盖了从750至3055 nm的2305 nm波长范围。引入的渐变折射率分布（RIP）作为一个新参数，为支持OAM模式的环形芯光纤（RCF）设计提供了一个额外的维度。渐变RIP有助于在RCF结构中创建平坦且接近零的色散，并减少材料边界处的自旋 - 轨道耦合（SOC）效应，从而在输出光谱中实现更宽的光谱覆盖范围和更高的模式纯度。