scholarly journals Up-down Taper Based In-Fiber Mach-Zehnder Interferometer for Liquid Refractive Index Sensing

Sensors ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 5440 ◽  
Author(s):  
Xiaopeng Han ◽  
Chunyu Liu ◽  
Shengxu Jiang ◽  
Shuo Leng ◽  
Jiuru Yang
Keyword(s):  
Refractive Index ◽  
Temperature Fluctuation ◽  
Extinction Ratio ◽  
Single Mode ◽  
Zehnder Interferometer ◽  
Structure Parameters ◽  
Refractive Index Sensing ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Mach Zehnder Interferometer

A novel in-fiber Mach-Zehnder interferometer based on cascaded up-down-taper (UDT) structure is proposed by sandwiching a piece of polarization maintaining fiber between two single-mode fibers (SMF) and by utilizing over-fusion splicing method. The dual up tapers respectively act as fiber splitter/combiner, the down taper acts as an optical attenuator. The structure parameters are analyzed and optimized. A larger interference fringe extinction ratio ~15 dB is obtained to achieve refractive index (RI) sensing based on intensity demodulation. The experimental results show that the RI sensitivity is −310.40 dB/RIU with the linearity is improved to 0.99 in the range of 1.3164–1.3444. The corresponding resolution can reach 3.22 × 10−5 RIU, which is 6.8 times higher than wavelength demodulation. The cross sensitivity which caused by temperature fluctuation is less than 1.4 × 10−4.

scholarly journals Dual Demodulation of Temperature and Refractive Index Using Ring Core Fiber Based Mach-Zehnder Interferometer

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 258
Author(s):  
Weihao Yuan ◽  
Changyuan Yu
Keyword(s):  
Refractive Index ◽  
Extinction Ratio ◽  
Linear Equations ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Zehnder Interferometer ◽  
Wavelength Shift ◽  
Core Fiber ◽  
Ring Core ◽  
Mach Zehnder Interferometer

We report the ring core fiber spliced with single mode fiber and no core fiber which is used for temperature and refractive index (RI) sensing. The Mach-Zehnder interferometer (MZI) is formed with this kind of sandwich fiber structure and the maximum extinction ratio of the interference spectra reaches 27 dB with the free spectra range of 12 nm. The MZI fiber sensor is applied for temperature sensing with the sensitivity of 69 pm/°C and 0.051 dB/°C. The RI sensitivity reaches 182.07 dB/RIU and −31.44 nm/RIU with the RI ranging from 1.33 to 1.38. The RI value can be directly demodulated with the interference dip intensity which shows insensitivity to temperature. The demodulation of temperature can be achieved by using the linear equations between dip wavelength shift with the variation of temperature and RI.

Refractive Index Sensing With Mach–Zehnder Interferometer Based on Concatenating Two Single-Mode Fiber Tapers

2008 ◽  
Vol 20 (8) ◽  
pp. 626-628 ◽  
Author(s):  
Zhaobing Tian ◽  
Scott S.-H. Yam ◽  
Jack Barnes ◽  
Wojtek Bock ◽  
Patricia Greig ◽  
...  
Keyword(s):  
Refractive Index ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Zehnder Interferometer ◽  
Refractive Index Sensing ◽  
Mach Zehnder Interferometer

Refractive index and temperature sensing characteristics of an optical fiber sensor based on a tapered single mode fiber/polarization maintaining fiber

2016 ◽  
Vol 14 (5) ◽  
pp. 050604-50608
Author(s):  
Zaihang Yang Zaihang Yang ◽  
Hao Sun Hao Sun ◽  
Tingting Gang Tingting Gang ◽  
Nan Liu Nan Liu ◽  
Jiacheng Li Jiacheng Li ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Temperature Sensing ◽  
Fiber Sensor ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Sensing Characteristics
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