Algorithm of the Cavity Length Demodulation for Optical Fiber F-P Sensors Based on Nuttall Window Four-spectrum-line Interpolation FFT

2021 ◽  
Author(s):  
Wei Liu ◽  
Tianyu Yang ◽  
Jianwei Wu ◽  
Liang Zhang ◽  
Yuming Dong
Keyword(s):  
Optical Fiber ◽  
Cavity Length ◽  
Spectrum Line

scholarly journals Optical Fiber Interferometers Based on Arc-Induced Long Period Gratings at INESC TEC

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 7400
Author(s):  
Paulo Caldas ◽  
Gaspar Rego
Keyword(s):  
Refractive Index ◽  
Optical Fiber ◽  
Cavity Length ◽  
Fiber Optic ◽  
Fiber Diameter ◽  
Long Period Grating ◽  
Long Period ◽  
Long Period Gratings ◽  
Cladding Mode ◽  
Mode A

In this work, we review the most important achievements of an INESC TEC long-period-grating-based fiber optic Michelson and Mach–Zehnder configuration modal interferometer with coherence addressing and heterodyne interrogation as a sensing structure for measuring environmental refractive index and temperature. The theory for Long Period Grating (LPG) interferometers and coherence addressing and heterodyne interrogation is presented. To increase the sensitivity to external refractive index and temperature, several LPG interferometers parameters are studied, including order of cladding mode, a reduction of the fiber diameter, different type of fiber, cavity length and the antisymmetric nature of cladding modes.

Control of the Cavity Length Consistency of Miniaturization Optical Fiber F-P Sensor

2012 ◽  
Vol 41 (1) ◽  
pp. 1-5
Author(s):  
童杏林 TONG Xing-lin ◽  
文昌山 WEN Chang-shan ◽  
朱小龙 ZHU Xiao-long ◽  
王夏 WANG Xia ◽  
纪涛 JI Tao ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Cavity Length

scholarly journals High-Resolution Displacement Sensor Based on a Chirped Fabry–Pérot Interferometer Inscribed on a Tapered Microfiber

2019 ◽  
Vol 9 (3) ◽  
pp. 403 ◽  
Author(s):  
Zhong Lu ◽  
Yuan Cao ◽  
Guangying Wang ◽  
Yang Ran ◽  
Xinhuan Feng ◽  
...  
Keyword(s):  
High Resolution ◽  
Optical Fiber ◽  
Cavity Length ◽  
Spectral Characteristics ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Displacement Sensor ◽  
Fabry Perot ◽  
Displacement Sensitivity ◽  
Tension State

In this study, a high-resolution optical fiber Fabry–Pérot (FP) interferometer displacement sensor with chirped spectral characteristics based on a tapered microfiber is theoretically discussed and experimentally implemented. Instead of inscribing two fiber Bragg gratings (FBGs) on the symmetric position of the microfiber, we continuously inscribed one long FBG along the microfiber region to reduce the cavity length. The bandwidth of the interferometer is over 35 nm, and its displacement sensitivity is as high as 36.5 nm/mm at the tension state.

Bending loss formulas for step-index optical fiber and their applicable regions

1981 ◽  
Vol 64 (10) ◽  
pp. 95-103
Author(s):  
Kiyonobu Kusano ◽  
Shigeo Nishida
Keyword(s):  
Optical Fiber ◽  
Step Index ◽  
Bending Loss
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