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Frontiers of Optoelectronics

Front. Optoelectron.    2015, Vol. 8 Issue (4) : 431-438     DOI: 10.1007/s12200-014-0455-x
RESEARCH ARTICLE |
Fiber up-taper assisted Mach-Zehnder interferometer for high sensitive temperature sensing
Lili MAO1,2,Qizhen SUN1,2,Ping LU1,2,*(),Zefeng LAO3,Deming LIU1,2
1. National Engineering Laboratory for Next Generation Internet Access System, Huazhong University of Science and Technology, Wuhan 430074, China
2. College of Optical and electronic information, Huazhong University of Science and Technology, Wuhan 430074, China
3. College of Electrical and electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Abstract

A new in-line Mach-Zehnder interferometer (MZI) sensor consisting of a stub of multi-mode fiber and an up-taper was proposed and demonstrated. Temperature measurement can be carried out by detecting wavelength shift. Dependency of sensitivity on interferometer length and dip wavelength was discussed. Experimental results showed a maximum temperature sensitivity of 113.6 pm/°C can be achieved, which is superior to most fiber temperature sensors based on in-line MZIs within the range from 20°C to 80°C, also a good mechanical strength can be obtained. The proposed sensor is a good candidate for temperature measurement, due to the advantages of simple structure, easy fabrication, cost-effective and high sensitivity.

Keywords Mach-Zehnder interferometer (MZI)      multimode fiber (MMF)      up-taper      fiber sensor     
Corresponding Authors: Ping LU   
Just Accepted Date: 09 October 2014   Online First Date: 02 November 2014    Issue Date: 24 November 2015
 Cite this article:   
Lili MAO,Qizhen SUN,Ping LU, et al. Fiber up-taper assisted Mach-Zehnder interferometer for high sensitive temperature sensing[J]. Front. Optoelectron., 2015, 8(4): 431-438.
 URL:  
http://journal.hep.com.cn/foe/EN/10.1007/s12200-014-0455-x
http://journal.hep.com.cn/foe/EN/Y2015/V8/I4/431
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Lili MAO
Qizhen SUN
Ping LU
Zefeng LAO
Deming LIU
Fig.1  

(a) Structure of a temperature sensor exploiting a section of multimode fiber (MMF) and an up-taper; (b) microscopic image of an up-taper. SMF: single mode fiber

Fig.2  

Normalized transmission spectra for proposed temperature sensor with different interference lengths of (a) 30 mm, (b) 40 mm and (c) 50 mm

Fig.3  

Spatial frequency spectra of proposed temperature sensor with different interference lengths of 30, 40 and 50 mm

Fig.4  

Experimental setup of a temperature sensor. BBS: broadband light source; TEC: thermoelectric cooler; OSA: optical spectrum analyzer

Fig.5  

(a) Transmission spectra of the proposed sensor with a length of 30 mm; (b) relationship between temperature and wavelength shift of resonant dips

Fig.6  

(a) Transmission spectra of the proposed sensor with a length of 40 mm; (b) relationship between temperature and wavelength shift of resonant dips

Fig.7  

(a) Transmission spectra of the proposed sensor with a length of 50 mm; (b) relationship between temperature and wavelength shift of resonant dips

Fig.8  

Relationship between dip wavelength shift and temperature for investigating the repeatability of the experiment

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Note: TF: thinned fiber

Tab.1  

Comparison of performance of the reported in-line fiber Mach-Zehnder interferometers for temperature sensing

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