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对于集成在光纤中的离散光学系统来说, 各个分立波导的光场会相互耦合和关联. 本文研究了如何通过热扩散对离散波导的折射率进行调控来加强离散波导之间的耦合. 文中构建了离散波导热扩散模型和双芯、三芯光纤的热扩散耦合模型. 使用氢氧焰对多芯光纤进行不同时间的高温加热, 同时监测纤端的出射光场. 通过对热扩散后多芯光纤三维折射率分布的测量结果, 验证了热扩散技术改变离散波导的折射率进行耦合的可行性. 热扩散技术可应用于制备多芯光纤耦合器, 借助于该耦合器, 结合多芯光纤和逐芯刻写光纤布拉格光栅技术, 实现了多光栅的单通道传感测量. 热扩散对离散波导的折射率调控方法具有高集成度、高稳定性和可批量化制造的优点. 对离散波导热扩散的研究有助于促进多芯光纤器件制备能力的发展, 有益于促进离散波导结构光纤在光通信、光感测、生物医学、人工智能等领域的广泛应用.For discrete optical systems integrated into optical fibers, the optical fields of the individual waveguides are coupled and correlated with each other. This paper studies how to adjust the refractive index of discrete waveguides by thermal diffusion, so as to enhance the coupling between discrete waveguides, and also constructs the discrete waveguide thermally diffused model and the thermally diffused coupling model of twin-core and three-core fibers. The multicore fiber is heated different times by a hydrogen-oxygen flame, and the outgoing light field at the end face of the optical fiber is monitored at the same time. Then, the three-dimensional refractive index measurement results of the thermally diffused multicore fiber verify the feasibility of thermal diffusion technology to change the refractive index of discrete waveguides for coupling. Thermal diffusion technology can be used to fabricate multicore fiber couplers. By combining multicore fiber and core-by-core inscribed fiber Bragg grating technology and by using thermal diffusion technology, the single-channel sensing measurement can be realized. The method of changing the refractive index of discrete waveguides through thermal diffusion has the advantages of high integration, high stability, and mass fabrication. The research on the thermal diffusion of discrete waveguides can improve the application potential of multicore fiber sensing systems, and promote the broad application of discrete waveguide structure optical fiber in the fields of optical communication, optical sensing, biomedicine, and artificial intelligence.
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Keywords:
- thermal diffusion /
- discrete waveguide /
- multicore fiber /
- coupler
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Yuan L B, Zhang X P, Yuan T T, Xu F, Liu Y G, Guo Y, Peng W, Guo T, Wang P F, Wang Y P, Wang D N 2023 How to Bulid a-Lab-on/in-Fiber (Beijing: Tsinghua Unisiverty Press) p81
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图 1 典型的线性分布离散波导[10] (a) 多个离散波导按线性分布在一个包层中的光纤; (b) 线性阵列多芯光纤的横截面显微图; (c) 线性阵列多芯光纤的折射率剖面示意图
Fig. 1. A typical linear distributed discrete waveguide[10]: (a) Optical fiber with multiple discrete waveguides linearly distributed in the same cladding; (b) micrograph of the cross-section of the linear array multicore fiber; (c) schematic diagram of the refractive index profile of the linear array multicore fiber.
图 2 (a) 用于热扩散的实验装置示意图; (b) 双芯、(c) 三芯、(d) 四芯和 (e) 七芯光纤加热不同时间后的端面强度分布
Fig. 2. (a) Schematic diagram of the experimental setup for thermal diffusion; (b)–(e) the end face light intensity distribution of the (b) twin-core, (c) three-core, (d) four-core, and (e) seven-core optical fiber after heating at different times.
图 3 折射率分布测量系统的示意图
Fig. 3. Schematic diagram of the refractive index distribution measurement system.
图 4 加热时间分别为 (a) 0, (b) 30, (c) 60, (d) 90 min时, 双芯光纤热扩散区y-z方向的折射率分布; 加热时间分别为 (e) 0, (f) 30, (g) 60 , (h) 90 min时, 双芯光纤热扩散区的三维折射率分布
Fig. 4. Refractive index distribution in the y-z direction of the thermally diffused zone of the twin-core fiber when the heating time is (a) 0, (b) 30, (c) 60 and (d) 90 min, respectively. The three-dimensional refractive index distribution of the thermally diffused zone of the twin-core fiber when the heating time is (e) 0, (f) 30, (g) 60 and (h) 90 min.
图 5 加热时间分别为 (a) 0, (b) 30, (c) 60, (d) 90 min时, 三芯光纤热扩散区y-z方向的折射率分布; 加热时间分别为 (e) 0, (f) 30, (g) 60, (h) 90 min时, 三芯光纤热扩散区的三维折射率分布
Fig. 5. Refractive index distribution in the y-z direction of the thermally diffused zone of the three-core fiber when the heating time is (a) 0, (b) 30, (c) 60 and (d) 90 min, respectively. The three-dimensional refractive index distribution of the thermally diffused zone of the three-core fiber when the heating time is (e) 0, (f) 30, (g) 60 and (h) 90 min.
图 6 加热时间分别为 (a) 0, (b) 30, (c) 60, (d) 90 min时, 四芯光纤热扩散区y-z方向的折射率分布; 加热时间分别为 (e) 0, (f) 30, (g) 60, (h) 90 min时, 四芯光纤热扩散区的三维折射率分布
Fig. 6. Refractive index distribution in the y-z direction of the thermally diffused zone of the four-core fiber when the heating time is (a) 0, (b) 30, (c) 60 and (d) 90 min, respectively. The three-dimensional refractive index distribution of the thermally diffused zone of the four-core fiber when the heating time is (e) 0, (f) 30, (g) 60 and (h) 90 min.
图 7 加热时间分别为 (a) 0, (b) 30, (c) 60, (d) 90 min时, 七芯光纤热扩散区y-z方向的折射率分布; 加热时间分别为 (e) 0, (f) 30, (g) 60, (h) 90 min时, 七芯光纤热扩散区的三维折射率分布
Fig. 7. Rfractive index distribution in the y-z direction of the thermally diffused zone of the seven-core fiber when the heating time is (a) 0, (b) 30, (c) 60 and (d) 90 min, respectively. The three-dimensional refractive index distribution of the thermally diffused zone of the seven-core fiber when the heating time is (e) 0, (f) 30, (g) 60 and (h) 90 min.
图 8 (a) 热扩散制备的三芯光纤耦合器的示意图; 不同加热时间的三芯光纤端面的强度分布, 其中(b) 0 min; (c) 30 min; (d) 60 min; (e) 90 min
Fig. 8. (a) Schematic diagram of a three-core fiber fabricated by thermal diffusion. The intensity distribution at the end face of the three-core fiber coupler with different heating times: (b) 0 min; (c) 30 min; (d) 60 min; (e) 90 min.
图 9 (a) 应用热扩散技术的弯曲传感器的示意图; (b) 不同弯曲方向(从0°到360°)对应的双芯光纤两个纤芯中FBGs的差分的弯曲灵敏度
Fig. 9. (a) Schematic diagram of the bending sensor structure using thermal diffusion technology; (b) differential bending sensitivity of FBGs in the two cores of a twin-core fiber plotted for various bending directions (from 0° to 360°)
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[1] Slussarenko S, Pryde G J 2019 Appl. Phys. Rev. 6 041303
Google Scholar
[2] Xiong Y F, Xu F 2020 Adv. Photonics 2 064001
Google Scholar
[3] Zhang Z W, Guo Y Y, Bescond M, Chen J, Nomura M, Volz S 2022 Phys. Rev. Lett. 128 015901
Google Scholar
[4] Yuan L B, Dai Q, Tian F J, Zhang T, Guan C Y, Zhu X L 2009 Opt. Lett. 34 1531
Google Scholar
[5] Meng L Z, Chen G D, Wang D H, Yuan L B 2021 J. Light. Technol. 39 3638
Google Scholar
[6] Huo Y M, Cheo P K, King G G 2004 Opt. Express 12 6230
Google Scholar
[7] Wrage M, Glas P, Fischer D, Leitner M, Elkin N N, Vysotsky D V, Napartovich A P, Troshchieva V N 2002 Opt. Commun. 205 367
Google Scholar
[8] Hayashi T, Taru T, Shimakawa O, Sasaki T, Sasaoka E 2012 J. Light. Technol. 30 583
Google Scholar
[9] Hayashi T, Taru T, Shimakawa O, Sasaki T, Sasaoka E 2011 Opt. Express 19 16576
Google Scholar
[10] 苑立波, 张新平, 苑婷婷, 徐飞, 刘艳格, 龚元, 彭伟, 郭团, 王鹏飞, 王义平, 王东宁 2023 怎样在光纤上构建实验室 (北京: 清华大学出版社) 第81页
Yuan L B, Zhang X P, Yuan T T, Xu F, Liu Y G, Guo Y, Peng W, Guo T, Wang P F, Wang Y P, Wang D N 2023 How to Bulid a-Lab-on/in-Fiber (Beijing: Tsinghua Unisiverty Press) p81
[11] Mills A F 1995 Heat and Mass Transfer (Boca Raton: CRC Press) p811
[12] Shiraishi K, Aizawa Y, Kawakami S 1990 J. Light. Technol. 8 1151
Google Scholar
[13] Crank J 1979 The Mathematics of Diffusion (Oxford: Clarendon Press) p69
[14] Barenblatt G I 1996 Scaling, self-similarity, and intermediate asymptotics (Cambridge: Cambridge University Press) p64
[15] Kliros G S, Tsironikos N 2005 Optik 116 365
Google Scholar
[16] Zhu X L, Yuan L B, Liu Z H, Yang J, Guan C Y 2009 J. Light. Technol. 27 5235
Google Scholar
[17] Kliros G 2011 Optoelectron. Adv. Mater.-Rapid Commun. 5 193
[18] Snyder A W, Love J D 1984 Optical Waveguide Theory (New York: Springer) p568
[19] Yablon A D 2013 Opt. Lett. 38 4393
Google Scholar
[20] Yablon A D 2005 Optical Fiber Fusion Splicing (Berlin: Springer-Verlag) p74
[21] Yuan L B, Liu Z H, Yang J 2006 Opt. Lett. 31 3237
Google Scholar
[22] Zhang H J, Healy N, Dasgupta S, Hayes J R, Petrovich M N, Richardson D J, Peacock A C 2017 IEEE Photonics Technol. Lett. 29 591
Google Scholar
[23] Zhang F M, Liu Z Y X, Du H Z, Shao Y H, Shen L, Yang L B, Yan C K, Zhao Z Y, Tang M 2022 Opt. Express 30 19042
Google Scholar
[24] Zhao Y J, Zhou A, Ouyang X W, Ouyang Y, Zhou C M, Yuan L B 2017 J. Light. Technol. 35 5473
Google Scholar
[25] Bao W J, Sahoo N, Sun Z Y, Wang C L, Liu S, Wang Y P, Zhang L 2020 Opt. Express 28 26461
Google Scholar
[26] Zhao Z Y, Dang Y L, Tang M 2022 Photonics 9 381
Google Scholar
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