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研究并分析了一种采用三层芯结构的单模大模场面积低弯曲损耗光纤. 纤芯由纤芯高折射率层、包层低折射率层和下陷低折射率层三层结构构成. 系统地分析了三层芯光纤(three-layer-core fiber, TLF)中不同结构参数对基模模场面积及弯曲损耗的影响. 研究表明, 通过调整三层芯的结构参数, 在不牺牲截止波长的前提下, 这种TLF可以实现在增大基模有效面积(Aeff)的同时, 将弯曲损耗降到更低. 通过调整纤芯中三层芯的结构参量, Aeff可以达到100—330 μm2甚至更高. 此外, 在相同模场面积Aeff下, 三层芯光纤的弯曲损耗可以比普通阶跃型光纤(SIF)要低2—4个数量级. 分析表明这种大有效面积、低弯曲损耗三层芯单模光纤在宽带大容量传输、及大功率光纤激光器和放大器中具有重要的潜在应用价值.A three-layer-core single-mode large-mode-area fiber with low bending loss is investigated in this paper. The three-layer structure in the core which is comprised of core-index layer, cladding-index layer and depression-index layer, can achieve large-effective-area Aeff while maintaining low-bending-loss without deteriorating cutoff behaviors. The large-mode-area of 100–330 μm2 can be achieved in the fiber. The effective area Aeff can be further enlarged by adjusting the layer parameters. Furthermore, the bending property can be improved in this three-layer-core structure. The bending loss can decrease by 2–4 orders of magnitude compared with the bending loss of the conventional step-index fiber with the same Aeff. These characteristics of three-layer-core fiber suggest that it can be used in large-mode-area wide-bandwidth high-capacity transmission, or high-power optical fiber laser and amplifier in the optical communications, which can be conducive to studying the basic physical layer structure of big data storage, reading, calculation and transmission applications and so on.
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Keywords:
- three-layer-core /
- single mode operation /
- large mode area /
- bending loss
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图 1 TLF的横截面结构及折射率分布图
Fig. 1. Cross section schematic and refractive index profile of TLF structure.
图 2 截止波长λC随不同层结构参数 (a)c、(b) b和 (c) Δ2的变化关系
Fig. 2. Cutoff wavelength λC as a function of the layer parameters: (a) c; (b) b; (c) Δ2.
图 3 截止波长λC随不同层结构参数 (a)b和c、(b) b和Δ2、(c) Δ2和c的变化关系
Fig. 3. Cutoff wavelength λC as a function of the layer parameters: (a) b and c, (b) b and Δ2, (c) Δ2 and c.
图 4 纤芯高折层半径a随不同层结构参数 (a)c、(b) b和(c) Δ2的变化曲线
Fig. 4. Relationship between core radius a and (a) c, (b) b, and (c) Δ2.
图 5 Aeff随不同层结构参数 (a) c、(b) b和 (c) Δ2的变化曲线
Fig. 5. Relationship between Aeff and (a) c, (b) b, and (c) Δ2
图 6 Aeff随不同层结构参数 (a) b和c、(b) b和Δ2和 (c) Δ2和c的变化关系
Fig. 6. Relationship between Aeff and (a) b and c, (b)b and Δ2, and (c) Δ2 and c.
图 7 不同层结构参数 (a) c、(b) b和 (d) Δ2下弯曲损耗随弯曲半径R的变化曲线; (c)弯曲半径R = 0.01 m时弯曲损耗随b的变化曲线
Fig. 7. Relationship between the bending lossand (a) c, (b) b, and (d) Δ2 at various R; (c) relationship between the bending lossand b at R = 0.01 m.
图 8 TLF和SIF光纤结构的基模弯曲损耗随Aeff的变化曲线
Fig. 8. Bending loss as a function of Aeff for TLFs comparedto step-index fiber.
图 9 不同弯曲半径R下 (a)弯曲损耗、(b) Aeff的变化曲线
Fig. 9. Relationship between (a) bending loss, (b) effective area Aeff and bending radius. R.
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[1] Cai J, Cai Y, Davidson C, Lucero A, Zhang H, Foursa D, Sinkin O, Patterson W, Pilipetskii A, Mohs G, Bergano N 2011 National Fiber Optic Engineers Conference (NFOEC) Los Angeles, California, March 6, 2011 pPDPB4
[2] Sano A, Masuda H, Kobayashi T, Fujiwara M, Horikoshi K, Yoshida E, Miyamoto Y, Matsui M, Mizoguchi M, Yamazaki H, Sakamaki Y, Ishii H 2010 Optical Fiber Communication Conference (OFC) San Diego, California, March 21, 2010 pPDPB7
[3] Qian D, Huang M, Ip E, Huang Y, Shao Y, Hu J, Wang T 2011 Optical Fiber Communication Conference (OFC) Los Angeles, California, March 6, 2011 pPDPB5
[4] Dong L, Wu T W, Mckay H A, Fu L, Li J, Winful H G 2009 IEEE J. Sel. Top. Quantum Electron. 15 1
Google Scholar
[5] Dussardier B, Rastogi V, Kumar A, Monnom G 2011 Appl. Opt. 50 19
Google Scholar
[6] Jain D, Baskiotis C, Sahu J K 2013 Opt. Express 21 2
[7] Fini J M 2006 Opt. Express 14 1
Google Scholar
[8] Lees G P, Taverner D, Richardson D J, Dong L, Newson T P 1997 Electron. Lett. 33 5
Google Scholar
[9] Li M J, Tandon P, Bickham S R, McDermott M A, Desorcie R B, Nolan D A, Johnson J J, Lewis K A, Englebert J J 2009 J. Lightwave Technol. 27 3
Google Scholar
[10] Watekar P R, Ju S, Han W T 2009 Opt. Express 17 12
[11] Watekar P R, Ju S, Han W T 2011 Appl. Opt. 50 25
Google Scholar
[12] Takenaga K, Arakawa Y, Sasaki Y, Tanigawa S, Matsuo S, Saitoh K, Koshiba M 2011 Opt. Express 19 26
Google Scholar
[13] Saitoh K, Koshiba M, Takenaga K, Matsuo S 2012 IEEE Photon. Technol. Lett. 24 21
[14] Simovic A, Savovic S, Drljaca B, Djordjevich A 2014 Opt. Laser Technol. 57
[15] Kumar A, Rastogi V 2011 Applied Optics 50 25
[16] 吴重庆 2005 光波导理论第二版(北京: 清华大学出版社)
Wu C Q 2015 Theoretical Basis of Optical Waveguide (2nd Ed.) (Beijing: Tsinghua University Press) (in Chinese)
[17] 林桢 2014博士学位论文 (北京: 北京交通大学)
Lin Z 2014 P. h. D. Dissertation (Beijing: Beijing Jiaotong University) (in Chinese)
[18] 方宏, 娄淑琴, 任国斌, 郭铁英, 简水生 2006 中国激光 33 493
Google Scholar
Fang H, Lou S Q, Ren G B, Guo T Y, Jian S S 2006 Chin. J. Lasers 33 493
Google Scholar
[19] Birks T A, Knight J C, St P, Russell J 1997 Opt. Lett. 22 13
Google Scholar
[20] Petermann K 1977 Opt. and Quant Electron. 9 2
[21] Petermann K 1983 Electron. Lett. 19 18
Google Scholar
[22] 李春生, 李琳莹, 杨世信, 甘露, 宋志佗, 李雪松 2013 现代传输 2 72
Google Scholar
Li C S, Li L Y, Yang S X, Gan L, Song Z T, Li X S 2013 Mearments Standard 2 72
Google Scholar
[23] Baggett J C, Monro T M, Furusawa K, Finazzi V, Richardson D J 2003 Optics Commun. 227 4
[24] Dutt A, Mahapatra S, Varshney S K 2011 J. Opt. Soc. Am. B 28 6
[25] Ulrich R, Rashleigh S C, Eickhoff W 1980 Opt. Lett. 5 6
[26] Jeunhomme L B 1989 Single-Mode Fiber Optics 2 nd ed. (New York: Marcel Dekker)
[27] Matsuo S, Ikeda M, Kutami H, Himeno K 2005 IEICE Trans. Electron. E88-C5
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