Research on a New Type of Ring-core Fiber and Mode Selective Coupler

XU Qingxiang; YAN Miao; LI Maochun; ZHANG Junhao; MA Xiaoyu; CHEN Wei

doi:10.13756/j.gtxyj.2025.240015

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Research on a New Type of Ring-core Fiber and Mode Selective Coupler

更新时间：2025-05-08

- Research on a New Type of Ring-core Fiber and Mode Selective Coupler
- Study on Optical Communications Issue 2, (2025)
- 作者机构：
  
  1.a. 上海市特种光纤与光接入网重点实验室；b. 光纤研究所；c. 特种光纤与先进通信国际合作联合实验室　上海大学，上海　 200444
  2.中国船舶航海保障技术实验室，天津　 300130
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2025.240015
  CLC： TN253
- Received：22 January 2024，
  
  Revised：2024-03-11，
  
  Published：10 April 2025
- 稿件说明：
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许青向，颜苗，李茂春，等. 新型环芯光纤及其模式选择耦合器的研究[J].光通信研究，2025(2)：240015.

Xu Q X, Yan M, Li M C, et al. Research on a New Type of Ring-core Fiber and Mode Selective Coupler[J]. Study on Optical Communications, 2025(2): 240015.
许青向，颜苗，李茂春，等. 新型环芯光纤及其模式选择耦合器的研究[J].光通信研究，2025(2)：240015. DOI： 10.13756/j.gtxyj.2025.240015.

Xu Q X, Yan M, Li M C, et al. Research on a New Type of Ring-core Fiber and Mode Selective Coupler[J]. Study on Optical Communications, 2025(2): 240015. DOI： 10.13756/j.gtxyj.2025.240015.

摘要

【目的】

模式选择耦合器（MSC）是模分复用（MDM）光纤通信系统的关键器件。在MDM系统中，MSC可以实现不同信号在不同的模式中传输，从而增大传输容量。但在制备低插入损耗MSC时，由于模式之间的传播常数非常接近，MSC的制备难度较大，因此急需一种模式易分离的少模光纤（FMF）作为MSC制备的关键材料，以降低MSC的制备难度。

【方法】

文章提出并制备了一种新型环芯FMF，该FMF在C波段通信支持3个线性偏振模LP

、LP

以及LP

。基于模耦合理论，文章分析了MSC各参数对模式耦合的影响，并研究了纤芯间距与耦合距离在模式间的耦合规律。

【结果】

文章采用熔融拉锥方法制备出了LP

、LP

以及LP

的MSC，实验结果表明，LP

、LP

以及LP

的MSC在1 540、1 530和1 550 nm的插入损耗分别为0.10、0.17和0.30 dB，模式转换效率分别为97.72%、96.16%和93.32%，LP

、LP

和LP

的模式转换带宽分别为125、120和35 nm。

【结论】

文章为MSC的制备提供了一种新型环芯FMF，可降低MSC的制备难度，该低损耗MSC在MDM光纤通信系统具有良好的应用前景。

Abstract

【Objective】

Mode-Selected Coupler (MSC) is a key component of Mode Division Multiplexing (MDM) for optical fiber communication system. In a MDM system

MSC can realize the transmission of different signals in different modes

thus increasing the transmission capacity. However

when fabricating a MSC with low insertion loss

the fabrication difficulty of the MSC is heightened due to the very close propagation constants between the modes. Therefore

there is an urgent need for a Few-Mode Fiber (FMF) with easily separable modes to serve as a key material for the fabrication of MSCs

thereby reducing the fabrication difficulty.

【Methods】

In this letter

a new type of ring-core FMF is proposed and fabricated. The FMF supports three linearly polarized modes LP

and LP

in the C-band for fiber communication. Based on the theory of mode coupling

the article analyzes the impact of various parameters of the MSC on mode coupling and studies the coupling patterns between modes as influenced by fiber core spacing and coupling distance.

【Results】

The fused biconical tapering method is used to fabricate the MSCs of LP

and LP

. The experimental results show that the insertion losses of the MSCs of LP

and LP

at 1 540

1 530 and 1 550 nm are 0.10

0.17 and 0.30 dB

respectively. The mode conversion efficiencies are 97.72%

96.16% and 93.32%

respectively. The mode conversio

n bandwidths of LP

and LP

are 125

120 and 35 nm

respectively.

【Conclusion】

This research provides a new type of ring-core FMF

which can reduce the fabrication difficulty of MSCs. The low-loss MSCs have great potential application for MDM optical fiber communication system.

关键词

Keywords

references

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