中文

Journal of Applied Sciences >

2025 , Vol. 43 >Issue 6: 893 - 908

DOI: https://doi.org/10.3969/j.issn.0255-8297.2025.06.001

Communication Engineering

Mode Regulation Characteristics and Control Rules of Center-Assisted Ring-Core Fiber

  • ZHENG Jingjing ,
  • YE Xiao ,
  • SONG Yujing ,
  • PEI Li ,
  • NING Tigang
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  • 1. Key Laboratory of All Optical Network & Advanced Telecommunication Network of EMC, Institute of Lightwave Technology, Beijing Jiaotong University, Beijing 100044, China;
    2. Institute of Jinan Software, China United Network Communication Group Co., Ltd. Jinan 250100, Shandong, China

Received date: 2025-02-28

  Online published: 2025-12-19

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Abstract

In recent years, space division multiplexing (SDM) technology has been extensively utilized to enhance the capacity of optical fiber communications, with SDM fibers serving as the key enabling foundation. Among them, weakly coupled few-mode optical fibers reduce inter-mode coupling, effectively suppress mode crosstalk, and significantly lower the complexity and cost of the transmission system. In this paper, different structural types of weakly coupled few-mode fibers, and the work undertaken by our research team on center-assisted ring-core fibers are presented. Center-assisted ring-core fibers achieve the design objective of significantly separating spatial mode degeneracy while keeping polarization degeneracy unseparated under the conventional core-cladding refractive index difference level of communication fibers, and exhibit good tolerance to fabrication errors. Furthermore, design rules for controlling the separation of spatial mode degeneracy in center-assisted ring-core fibers are identified, unveiling the principle of regulating specific spatial mode separations by altering the symmetry of the fiber’s refractive index profile. The results provide valuable guidance for the design of similar fiber structures.

Key words： space division multiplexing (SDM); weakly coupled few-mode fiber; center-assisted ring-core fiber; degenerate mode

Cite this article

ZHENG Jingjing , YE Xiao , SONG Yujing , PEI Li , NING Tigang . Mode Regulation Characteristics and Control Rules of Center-Assisted Ring-Core Fiber[J]. Journal of Applied Sciences, 2025 , 43(6) : 893 -908 . DOI: 10.3969/j.issn.0255-8297.2025.06.001

References

[1] Richardson D J, Fini J M, Nelson L E. Space-division multiplexing in optical fibres[J]. Nature Photonics, 2013, 7(5): 354-362.
[2] Van Uden R G H, Correa R A, Lopez E A, et al. Ultra-high-density spatial division multiplexing with a few-mode multicore fibre[J]. Nature Photonics, 2014, 8(11): 865-870.
[3] 迟荣华, 周燕萍, 李立亚. 多芯光纤放大器研究现状及发展分析[J]. 激光与光电子学进展, 2019, 56(19): 190005. Chi R H, Zhou Y P, Li L Y. Research status and development analysis of multicore fiber amplifier[J]. Laser & Optoelectronics Progress, 2019, 56(19): 190005. (in Chinese)
[4] 涂佳静, 李朝晖. 空分复用光纤研究综述[J]. 光学学报, 2021, 41(1): 0106003. Tu J J, Li Z H. Review of space division multiplexing fibers[J]. Acta Optica Sinica, 2021, 41(1): 0106003. (in Chinese)
[5] 裴丽, 李祉祺, 王建帅, 等. 空分复用光纤放大器增益均衡技术研究进展[J]. 光学学报, 2021, 41(1): 0106001. Pei L, Li Z Q, Wang J S, et al. Review on gain equalization technology of fiber amplifier using space division multiplexing[J]. Acta Optica Sinica, 2021, 41(1): 0106001. (in Chinese)
[6] Li G F, Bai N, Zhao N B, et al. Space-division multiplexing: the next frontier in optical communication[J]. Advances in Optics and Photonics, 2014, 6(4): 413-487.
[7] Kasahara M, Saitoh K, Sakamoto T, et al. Design of few-mode fibers for mode-division multiplexing transmission[J]. IEEE Photonics Journal, 2013, 5(6): 7201207.
[8] Wang L X, Nejad R M, Corsi A, et al. Linearly polarized vector modes: enabling MIMO-free mode-division multiplexing[J]. Optics Express, 2017, 25(10): 11736-11748.
[9] Shen L, Chen S, Sun X T, et al. Design, fabrication, measurement and MDM transmission of a novel weakly-coupled ultra low loss FMF[C]//Optical Fiber Communications Conference and Exposition (OFC), 2018: Th2A.24.
[10] Ge D W, Li J H, Zhu J L, et al. Design of a weakly-coupled ring-core FMF and demonstration of 6-mode 10-km IM/DD transmission[C]//Optical Fiber Communications Conference and Exposition (OFC), 2018: W4K.3.
[11] Xiao H, Li H S, Jian S S. Hole-assisted polarization-maintaining few-mode fiber[J]. Optics and Laser Technology, 2018, 107: 162-168.
[12] Yaman F, Bai N, Zhu B Y, et al. Long distance transmission in few-mode fibers[J]. Optics Express, 2010, 18(12): 13250-13257.
[13] Fontaine N K, Ryf R, Hirano M, et al. Experimental investigation of crosstalk accumulation in a ring-core fiber[C]//IEEE Photonics Society Summer Topical Meeting, 2013: 111-112.
[14] Kasahara M, Saitoh K, Sakamoto T, et al. Design of three-spatial-mode ring-core fiber[J]. Journal of Lightwave Technology, 2014, 32(7): 1337-1343.
[15] Jiang S L, Ma L, Zhang Z P, et al. Design and characterization of ring-assisted few-mode fibers for weakly coupled mode-division multiplexing transmission[J]. Journal of Lightwave Technology, 2018, 36(23): 5547-5555.
[16] Wang Z, Ju J, Jin W. Properties of elliptical-core two-mode fiber[J]. Optics Express, 2005, 13(11): 4350-4357.
[17] Liang J P, Mo Q, Fu S N, et al. Design and fabrication of elliptical-core few-mode fiber for MIMO-less data transmission[J]. Optics Letters, 2016, 41(13): 3058-3061.
[18] Wang L X, Larochelle S. Design of eight-mode polarization-maintaining few-mode fiber for multiple-input multiple-output-free spatial division multiplexing[J]. Optics Letters, 2015, 40(24): 5846-5849.
[19] Zhao J J, Tang M, Oh K, et al. Polarization-maintaining few mode fiber composed of a central circular-hole and an elliptical-ring core[J]. Photonics Research, 2017, 5(3): 261-266.
[20] Corsi A, Ho Chang J H, Wang R H, et al. Highly elliptical core fiber with stress-induced birefringence for mode multiplexing[J]. Optics Letters, 2020, 45(10): 2822-2825.
[21] 薛宇勃, 李海粟, 刘亚静, 等. 支持10个模式的空气孔辅助型偏振保持少模光纤[J]. 中国激光, 2022, 49(17): 1706001. Xue Y B, Li H S, Liu Y J, et al. Air hole-assisted polarization-maintaining few-mode fiber supporting 10 modes[J]. Chinese Journal of Lasers, 2022, 49(17): 1706001. (in Chinese)
[22] Yang T X, Zhang H, Xi L X, et al. Design of 18-mode hole-assisted elliptical-core polarizationmaintaining few-mode fiber[J]. Optics Communications, 2022, 507: 127647.
[23] Gao Y, Li Y L, Li X, et al. An elliptical-core few-mode fiber with low loss and low crosstalk for the MIMO-FREE applications[J]. Frontiers in Physics, 2022, 9: 796549.
[24] Yan H Z, Li S Y, Xie Z Y, et al. Design of PANDA ring-core fiber with 10 polarizationmaintaining modes[J]. Photonics Research, 2017, 5(1): 1-5.
[25] Yang Y, Mo Q, Fu S N, et al. Panda type elliptical core few-mode fiber[J]. APL Photonics, 2019, 4(2): 022901.
[26] Song W J, Chen H Y, Wang J P, et al. Panda type elliptical ring core few-mode fiber[J]. Optical Fiber Technology, 2020, 60: 102361.
[27] 刘亚男, 颜鑫, 袁学光, 等. 同心圆形应力区辅助的熊猫型保偏少模光纤[J]. 光学学报, 2023, 43(20): 2006001. Liu Y N, Yan X, Yuan X G, et al. Concentric-circular stress-applying region-assisted panda polarization-maintaining few-mode fiber[J]. Acta Optica Sinica, 2023, 43(20): 2006001. (in Chinese)
[28] Chen S, Wang J. Fully degeneracy-lifted bow-tie elliptical ring-core multi-mode fiber[J]. Optics Express, 2018, 26(14): 18773-18782.
[29] Yang T, Zhang H, Xi L, et al. Design of a novel bow-tie polarization ring-core few-mode fiber for MIMO-free MDM system[C]//26th Opto-Electronics and Communications Conference (OECC), 2021: JS3C.3.
[30] 慈英娟, 任芳, 张金玉, 等. 面向模分复用的偏振保持领结型椭圆芯少模光纤的设计[J]. 强激光与粒子束, 2022, 34(11): 111006. Ci Y J, Ren F, Zhang J Y, et al. Design of polarization-maintaining bow-tie elliptical-core few-mode fiber for mode-division-multiplexing[J]. High Power Laser and Particle Beams, 2022, 34(11): 111006. (in Chinese)
[31] Ci Y J, Ren F, Lei X, et al. A weakly-coupled double bow-tie multi-ring elliptical core multimode fiber for mode division multiplexing across C+L+U band[J]. Applied Sciences, 2023, 13(10): 5855.
[32] Rashleigh S C, Marrone M J. Polarization holding in elliptical-core birefringent fibers[J]. IEEE Journal of Quantum Electronics, 1982, 18(10): 1515-1523.
[33] 延凤平, 卫延, 傅永军, 等. 熊猫型保偏光纤中应力区失配对光纤性能影响的研究[J]. 物理学报, 2009, 58(1): 321-327. Yan F P, Wei Y, Fu Y J, et al. Study on the performance of stress area mismatched panda polarization-maintaining fiber[J]. Acta Physica Sinica, 2009, 58(1): 321-327. (in Chinese)
[34] Sasaki Y, Tajima K, Seikai S. 26 km-long polarisation-maintaining optical fibre[J]. Electronics Letters, 1987, 23(3): 127-128.
[35] 郑晶晶, 宋豫婧, 裴丽, 等. 面向空分复用的矩形辅助环芯光纤设计及特性[J]. 光学学报, 2022, 42(16): 1606006. Zheng J J, Song Y J, Pei L, et al. Design and characteristics of rectangular-assistant ring-core fiber for space division multiplexing[J]. Acta Optica Sinica, 2022, 42(16): 1606006. (in Chinese)
[36] Rechtman L, Marom D M. Rectangular versus circular fiber core designs: new opportunities for mode division multiplexing?[C]//Optical Fiber Communications Conference and Exhibition (OFC), 2017: Th2A.10.
[37] Song Y J, Zheng J J, Pei L, et al. Design and characteristics of ellipse-assisted ring-core fiber for space division multiplexing[J]. Optical Fiber Technology, 2022, 72: 102984.
[38] Song Y J, Zheng J J, Pei L, et al. Design and characteristics of diamond-assisted ring-core fiber for space division multiplexing[J]. Photonics, 2022, 9(10): 766.
[39] Ye X, Ning T G, Pei L, et al. Research on center-assisted ring-core few-mode fiber with an eccentric circle for mode degeneracy separation in space division multiplexing[J]. Journal of the Optical Society of America B, 2025, 42(1): 60-68.
[40] Song Y J, Zheng J J, Pei L, et al. Design and characteristics of square-assisted ring-core fiber for mode space degenerate modulating[C]//Thirteenth International Conference on Information Optics and Photonics (CIOP 2022), 2022: 124783R.
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