Refractive index sensing based on the modal interference of U-shape bending fiber

被引：0

作者：

Tang, Jie-Yuan ^{[1
]}

Zhang, Quan-Quan ^{[1
]}

Zeng, Yang-Fu ^{[2
]}

Luo, Yun-Han ^{[1
]}

Chen, Zhe ^{[1
]}

Yu, Jian-Hui ^{[1
]}

Lu, Hui-Hui ^{[1
]}

Zhang, Jun ^{[1
]}

机构：

[1] Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, Department of Optoelectronic Engineering, Jinan University, Guangzhou

[2] Department of Information Engineering, College of Optoelectronic Engineering, Chongqing University, Chongqing

来源：

Guangzi Xuebao/Acta Photonica Sinica | 2015年 / 44卷 / 05期

关键词：

Interference; Optical fiber; Refractive index; Sensor; Spectrum; U-bend fiber;

D O I：

10.3788/gzxb20154405.0506003

中图分类号：

学科分类号：

摘要：

To develop a kind of easy-fabrication and stable optical fiber sensor, a new method for fabricating the fiber sensors was proposed, and the sensing performance of a U-shape bending single mode fiber was investigated. A section of SM-28 single mode fiber was bent into U-shaped structure with variety of radii of curvature, and then the U-shaped structure is fixed. After that, the U-shaped portion of the fiber was immersed in liquid with different refractive indices respectively. Meanwhile, the transmission spectrum of the U-shaped optical fiber was recorded. The modal interference theoretical analysis shows that the core guiding mode and the cladding mode, which propagate independently in the bending section, interferes each other in the straight region, and that the interference wavelengths depend on the bending radius and surrounding refractive index. Obvious interference spectra can be clearly observed on the U-shape bending fiber with radius ranging from 2.5 mm to 5.0 mm. The interference wavelengths red-shift as the surrounding refractive index increases from 1.30 to 1.43 RIU. Higher sensitivity could be achieved when the bending fiber has a lager bending radius. In the case of the bending radius being 5.0 mm, the sensitivity reaches to 207 nm/RIU and 1220 nm/RIU in the SRI region of 1.30~1.40 RIU and 1.40~1.42 RIU. The characteristics of the interference dip, such as full width at half maximum, contrast are determined by the ratio of core guiding mode and cladding mode. The narrowest full width at half maximum was achieved when the bending radius was 4.5 mm of U-bend single mode fiber were discussed. A low cost and easy making sensor was proposed. The figure of merit, which integrates the sensitivity and the full width at half maximum, reach the maximal value of 43.1 RIU-1 and 191.2 RIU-1 in the surrounding refractive index region of 1.30~1.40 RIU and 1.40~1.42 RIU, when the bending radius is 4.5 mm. This sensor is fabricated with a common single mode fiber with simply bending process, and shows potential in the fiber sensing application with the features of low cost and high mechanical strength. ©, 2015, Chinese Optical Society. All right reserved.

引用

页数：6

共 19 条

[1]

Liang W., Huang Y.-Y., Xu Y., Et al., Highly sensitive fiber Bragg grating refractive index sensors, Applied Physics Letters, 86, 4, (2005)

[2]

Biazoli C.R., Silva S., Franco M.A.R., Et al., Multimode interference tapered fiber refractive index sensors, Applied Optics, 51, 24, pp. 5941-5945, (2012)

[3]

Zhou Y.-W., Experimentally study on high-sensitivity fiber-optic refractometers based on mach-zehnder interference, Acta Photonica Sinica, 41, 7, pp. 841-844, (2012)

[4]

Bai C.-H., Luo Y.-H., Chen Z., Characteristics of side-polished fiber in refractive index sensing, Acta Photonica Sinica, 42, 10, pp. 1182-1186, (2013)

[5]

Lin Y.-C., Characteristics of optical fiber refractive index sensor based on surface plasmon resonance, Microwave and Optical Technology Letters, 55, 3, pp. 574-576, (2013)

[6]

Chen X.-L., Luo Y.-H., Xu M.-Y., Et al., Refractive index and temperature sensing based on surface plasmon resonance fabricated on a side-polished fiber, Acta Optica Sinica, 34, 2, (2014)

[7]

Sun D., Ran Z.-L., Rao Y.-J., Laser-machined miniature fiber-optic refractive-index sensor tip, Acta Photonica Sinica, 39, 7, pp. 1239-1242, (2010)

[8]

Zhao Y., Jin Y.-X., Dong X.-Y., Et al., Experimental studies of multimode interference based fiber optic refractive index sensors, Chinese Journal of Lasers, 37, 6, pp. 1516-1519, (2010)

[9]

Li E.-B., Zheng D.-Y., Zhang C.-L., Et al., A refractive index sensor based on the multimode interference in a hollow fiber, Journal of optoelectronics & Laser, 21, 10, pp. 1439-1444, (2010)

[10]

Fukano H., Hashiomto T., Taue S., Reffection-type optical fiber refractive-index sensorusing a multimode interference structure with high sensitivity, Japanese Journal of Applied Physics, 53, 2, (2014)

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