Highly sensitive refractive index sensor based on two cascaded special long-period fiber gratings with rotary refractive index modulation

2011 ◽  
Vol 50 (23) ◽  
pp. 4604 ◽  
Author(s):  
Yan-en Fan ◽  
Tao Zhu ◽  
Leilei Shi ◽  
Yun-Jiang Rao
Keyword(s):  
Refractive Index ◽  
Refractive Index Sensor ◽  
Refractive Index Modulation ◽  
Fiber Gratings ◽  
Long Period ◽  
Highly Sensitive ◽  
Long Period Fiber Gratings ◽  
Index Modulation

A Humidity Sensor Based on Ultra-Long-Period Fiber Gratings with Asymmetric Refractive Index Modulation

2009 ◽  
Vol 36 (8) ◽  
pp. 2042-2045 ◽  
Author(s):  
宋韵 Song Yun ◽  
朱涛 Zhu Tao ◽  
饶云江 Rao Yunjiang ◽  
赵英伟 Zhao Yingwei
Keyword(s):  
Refractive Index ◽  
Humidity Sensor ◽  
Refractive Index Modulation ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings ◽  
Index Modulation

Optimal design of temperature-insensitive long period fiber gratings for athermal refractive-index sensor

Optik ◽  
2011 ◽  
Vol 122 (23) ◽  
pp. 2147-2150 ◽  
Author(s):  
Qing-Li Jin ◽  
Wen-Jing Gu ◽  
Xiao-Hong Huang ◽  
Li-Fen Yan ◽  
Zhen-Guo Wang
Keyword(s):  
Refractive Index ◽  
Optimal Design ◽  
Refractive Index Sensor ◽  
Fiber Gratings ◽  
Long Period ◽  
Long Period Fiber Gratings

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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