High-Sensitivity Non-Birefringent Mach-Zehnder Interferometer for Sensing UV Induced Refractive Index Change Using an Unique Short Bi-Moded Optical Fibre

1999 ◽  
Author(s):  
Fatima C. Garcia ◽  
Raman Kashyap
Keyword(s):  
Refractive Index ◽  
Optical Fibre ◽  
Refractive Index Change ◽  
High Sensitivity ◽  
Zehnder Interferometer ◽  
Index Change ◽  
Mach Zehnder Interferometer

Measurement of In-Fiber Refractive Index Change Using a Mach–Zehnder Interferometer

2019 ◽  
Vol 31 (1) ◽  
pp. 74-77 ◽  
Author(s):  
Farid Ahmed ◽  
Vahid Ahsani ◽  
Seunghwan Jo ◽  
Colin Bradley ◽  
Ehsan Toyserkani ◽  
...  
Keyword(s):  
Refractive Index ◽  
Refractive Index Change ◽  
Zehnder Interferometer ◽  
Index Change ◽  
Mach Zehnder Interferometer

In-fiber Mach-Zehnder Interferometer Based on Cascading Fiber Air Bubble for High Sensitivity Liquid Refractive Index Measurement

2016 ◽  
Vol 45 (7) ◽  
pp. 70706006
Author(s):  
李辉栋 LI Hui-dong ◽  
傅海威 FU Hai-wei ◽  
邵敏 SHAO Min ◽  
闫旭 YAN Xu ◽  
贾振安 JIA Zhen-an
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Zehnder Interferometer ◽  
Refractive Index Measurement ◽  
Air Bubble ◽  
Index Measurement ◽  
Mach Zehnder Interferometer

scholarly journals Design Rule of Mach-Zehnder Interferometer Sensors for Ultra-High Sensitivity

Sensors ◽  
2020 ◽  
Vol 20 (9) ◽  
pp. 2640 ◽  
Author(s):  
Yiwei Xie ◽  
Ming Zhang ◽  
Daoxin Dai
Keyword(s):  
Refractive Index ◽  
High Sensitivity ◽  
Silicon On Insulator ◽  
Zehnder Interferometer ◽  
Design Rule ◽  
Wavelength Shift ◽  
Shift Measurement ◽  
Refractive Index Unit ◽  
Index Unit ◽  
Mach Zehnder Interferometer

A design rule for a Mach-Zehnder interferometer (MZI) sensor is presented, allowing tunable sensitivity by appropriately choosing the MZI arm lengths according to the formula given in this paper. The present MZI sensor designed by this method can achieve an ultra-high sensitivity, which is much higher than any other traditional MZI sensors. An example is given with silicon-on-insulator (SOI) nanowires and the device sensitivity is as high as 106 nm/refractive-index -unit (or even higher), by choosing the MZI arms appropriately. This makes it possible for one to realize a low-cost optical sensing system with a detection limit as high as 10−6 refractive-index-unit, even when a cheap optical spectrum analyzer with low-resolution (e.g., 1 nm) is used for the wavelength-shift measurement.

High Sensitivity Refractive Index Sensor Based on Long Period Fiber Gratings in Line Mach-Zehnder Interferometer

2013 ◽  
Vol 658 ◽  
pp. 609-613 ◽  
Author(s):  
Jia Rong Zheng ◽  
Yong Qin Yu ◽  
Zhi Long Ou ◽  
Chen Lin Du ◽  
Pei Guang Yan ◽  
...  
Keyword(s):  
Refractive Index ◽  
Temperature Response ◽  
High Sensitivity ◽  
Zehnder Interferometer ◽  
Refractive Index Sensor ◽  
Fiber Gratings ◽  
Refractive Index Measurement ◽  
Long Period ◽  
Long Period Fiber Gratings ◽  
Mach Zehnder Interferometer

Mach-Zehnder interferometer formed by a pair of long period fiber gratings on single mode fiber is investigated as surrounding refractive index sensors. Interference fringes with bandwidth of 1.68 nm are induced by core mode and the excited cladding mode. High SRI sensitivity of 280.74 nm/RIU at 1437.74 nm in the range of 1.333 to 1.360 is achieved. Whilst the strain sensitivity (~0.33 nm/mε) and temperature response (~20.7 pm/°C) at 1428.64 nm are relatively low, which is superior in avoiding cross sensitivity in refractive index measurement.

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