Investigation of single mode polarization-maintaining fibres for directional transverse force measurement

Stress-induced birefringence in single mode polarization maintaining optical fibers has been investigated using the finite element method. The modal birefringence caused by external forces in the Panda and the Side Tunnel fibers are calculated. It is found that the modal birefringence is directly proportional to the radial distance from the fiber center. As expected, the modal birefringence vanishes with the variation in the magnitude of the applied external loads.Key Words: Birefringence, Polarization, Panda Fiber, Side-Pit Fiber, Finite Element Method.

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

Chinese Optics Letters ◽

10.3788/col201614.050604 ◽

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

Sensors ◽

10.3390/s19245440 ◽

2019 ◽

Vol 19 (24) ◽

pp. 5440 ◽

Cited By ~ 2

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.

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