弱耦合多芯光纤的设计与优化

詹仪; 王安; 张清龙; 王奕涵

doi:10.37188/CO.EN-2026-0006

弱耦合多芯光纤的设计与优化

曲阜师范大学工学院, 山东日照276800

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中图分类号: TN253
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出版历程
- 收稿日期: 2026-01-12
- 录用日期: 2026-02-12
- 网络出版日期: 2026-03-19

Design and optimization of weakly coupled multi-core fiber

doi: 10.37188/CO.EN-2026-0006

College of Engineering, Qufu Normal University, Ri zhao 276800, Shan dong, China

Funds: Supported by Natural Science Foundation of Shandong Province (No. ZR2020MF107)

More Information

Author Bio:
ZHAN Yi (1969—), female, from Rizhao, Shandong Province. Ph.D., Professor, and Doctoral Supervisor. She received her Ph.D. degree in Materials Science and Engineering from Zhengzhou University in 2007. Her research focuses on optical fiber nonlinearities and ultrafast laser generation mechanisms of nanomaterials. Current interests include the mode-locking mechanism and device design of fiber lasers based on chalcogenide nanocrystals. E-mail: zhanyi@qfnu.edu.cn

Corresponding author: zhanyi@qfnu.edu.cn

摘要

摘要:
为实现光纤结构参数的全面、高效及多目标精确优化，并进一步提升光通信系统的传输容量，本文引入粒子群优化算法（PSO）代替传统经验设计或局部扫描方法，设计一种基于沟槽辅助结构的同质弱耦合七芯光纤。在建立一个包含色散、截止波长、有效模场面积和涂层损耗等约束条件的多目标适应度函数的基础上，利用粒子群优化算法进行全局搜索，在标准尺寸约束下精确确定光纤的最佳结构参数。仿真结果表明：在光纤纤芯间距为45 μm时，优化后的光纤在1550 nm波长处实现了低于−90 dB/km的超低芯间串扰，有效解决了多芯光纤中串扰抑制与空间利用率之间的冲突，证明了粒子群算法在复杂光纤结构设计中的高效性与可靠性，为超大容量光纤通信系统的研发与制造提供了重要的理论依据和技术支持。
- 多芯光纤 /
- 粒子群优化 /
- 沟槽辅助 /
- 芯间串扰 /
- 空分复用
Abstract:
In order to achieve comprehensive, highly efficient, and multi-objective precise optimization of fiber structural parameters and further enhance the transmission capacity of optical communication systems, a homogeneous weakly coupled seven-core fiber based on trench-assisted structures is designed. Particle Swarm Optimization (PSO) is introduced to replace traditional empirical designs or local scanning methods. First, a multi-objective fitness function incorporating constraints such as dispersion, cutoff wavelength, effective mode field area, and coating loss is established. Then, the algorithm performs a global search to precisely determine the optimal structural parameters under standard dimensional constraints. Simulation results demonstrate that with a fiber core pitch of 45 μm, the optimized fiber achieves an ultra-low inter-core crosstalk of below −90 dB/km at a wavelength of 1550 nm. This design scheme not only effectively resolves the conflict between crosstalk suppression and spatial utilization in multi-core fibers but also proves the efficiency and reliability of the PSO algorithm in complex fiber structural design, providing an important theoretical basis and technical support for the research and manufacturing of ultra-large-capacity optical communication systems.
- multi-core fiber /
- particle swarm optimization /
- trench-assisted /
- inter-core crosstalk /
- space division multiplexing

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Figure 1. Schematic of the optimized trench-assisted fiber

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Figure 2. Refractive index distribution

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Figure 3. Algorithm flow chart

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Figure 11. Optimized convergence curve (Each red circle represents an iteration)

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Figure 4. super-modes and refractive index profile

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Figure 5. Crosstalk-induced Loss vs. Power Coupling Coefficient at 100 km

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Figure 6. Dispersion characteristics of minimum parameter combination optical fiber mode

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Figure 7. Dispersion characteristics of maximum parameter combination optical fiber mode

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Figure 8. Minimum parameter combination fiber dispersion value

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Figure 9. Maximum parameter combination fiber dispersion value

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Figure 10. Constraint combination

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Figure 12. TA-MCF Crosstalk vs Core Radius and Pitch

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Figure 13. TA-MCF Crosstalk vs Δ1 and Δ2

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Figure 14. TA-MCF Crosstalk vs Fiber Length

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Figure 15. Variations of crosstalk and dispersion under ±1% deviation of core radius

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Table 1. Parameter combination

Parameters	Range	Step	Choices
$ {a}_{1}[\mu m] $	4~5	0.1	11
$ {w}_{cl}[\mu m] $	2.5~7.5	0.1	51
$ {w}_{tr}[\mu m] $	2.5~7.5	0.1	51
$ {\Delta }_{1} $	0.3%~0.6%	0.01%	31
$ {\Delta }_{2} $	−0.7%~−0.35%	0.01%	36
$ \Lambda [\mu m] $	30~45	0.1	151

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Table 2. Comparison with other 7-core fiber designs

Reference	Structure Type	Core Pitch ($ \mu m $)	Crosstalk (dB/km)	$ {A}_{eff}({\mu m}^{2}) $
Ref. [11]	Trench-assisted	45	~50	80
Ref. [13]	Channel-assisted	35~45	−66(@1310 mm)	-
This work	Optimized Trench	45	<-90	~110

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