Reflectivity-tunable Bragg grating reflectors based on polarization-maintaining few-mode fibers

2020 ◽  
Author(s):  
Chongxi Wang ◽  
Zhanhua Huang ◽  
Guifang Li ◽  
Shan Zhang ◽  
Jian Zhao ◽  
...  
Keyword(s):  
Bragg Grating ◽  
Polarization Maintaining

Controllable Birefringent Polarization-Maintaining Fiber Bragg Grating with High Precision

2010 ◽  
Vol 37 (4) ◽  
pp. 1028-1032
Author(s):  
裴丽 Pei Li ◽  
赵瑞峰 Zhao Ruifeng ◽  
宁提纲 Ning Tigang ◽  
祁春慧 Qi Chunhui ◽  
李卓轩 Li Zhuoxuan ◽  
...  
Keyword(s):  
Fiber Bragg Grating ◽  
High Precision ◽  
Bragg Grating ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining

scholarly journals Bragg Grating Assisted Sagnac Interferometer in SiO2-Al2O3-La2O3 Polarization-Maintaining Fiber for Strain–Temperature Discrimination

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4772
Author(s):  
Zhifang Wu ◽  
Peili Wu ◽  
Maryna Kudinova ◽  
Hailiang Zhang ◽  
Perry Ping Shum ◽  
...  
Keyword(s):  
Communication Systems ◽  
Axial Strain ◽  
Underlying Mechanism ◽  
Magnetic Sensors ◽  
Bragg Grating ◽  
Fiber Optic Communication ◽  
New Type ◽  
Polarization Maintaining Fiber ◽  
Polarization Maintaining ◽  
Optic Communication

Polarization-maintaining fibers (PMFs) have always received great attention in fiber optic communication systems and components which are sensitive to polarization. Moreover, they are widely applied for high-accuracy detection and sensing devices, such as fiber gyroscope, electric/magnetic sensors, multi-parameter sensors, and so on. Here, we demonstrated the combination of a fiber Bragg grating (FBG) and Sagnac interference in the same section of a new type of PANDA-structure PMF for the simultaneous measurement of axial strain and temperature. This specialty PMF features two stress-applied parts made of lanthanum-aluminum co-doped silicate (SiO2-Al2O3-La2O3, SAL) glass, which has a higher thermal expansion coefficient than borosilicate glass used commonly in commercial PMFs. Furthermore, the FBG inscribed in this SAL PMF not only aids the device in discriminating strain and temperature, but also calibrates the phase birefringence of the SAL PMF more precisely thanks to the much narrower bandwidth of grating peaks. By analyzing the variation of wavelength interval between two FBG peaks, the underlying mechanism of the phase birefringence responding to temperature and strain is revealed. It explains exactly the sensing behavior of the SAL PMF based Sagnac interference dip. A numerical simulation on the SAL PMF’s internal stress and consequent modal effective refractive indices was performed to double confirm the calibration of fiber’s phase birefringence.

scholarly journals Simultaneous Temperature and Strain Measurements Using Polarization-Maintaining Few-Mode Bragg Gratings

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5221 ◽  
Author(s):  
Chongxi Wang ◽  
Zhanhua Huang ◽  
Guifang Li ◽  
Shan Zhang ◽  
Jian Zhao ◽  
...  
Keyword(s):  
Simultaneous Measurement ◽  
Phase Modulation ◽  
Experimental Results ◽  
Bragg Grating ◽  
Wavelength Shift ◽  
Reflection Spectra ◽  
Phase Sensitivity ◽  
Strain Measurements ◽  
Calculated Phase ◽  
Polarization Maintaining

Simultaneous measurement of temperature and strain was demonstrated using a polarization-maintaining few-mode Bragg grating (PM-FMF-FBG) based on the wavelength and phase modulation of the even L P 11 mode. The wavelength shift sensitivity and the interrogated phase sensitivity of the temperature and strain were measured to be 10 pm·°C−1 and 0.73 pm·με−1 and −3.2 × 10−2 rad·°C−1 and 4 × 10−4 rad·με−1, respectively, with a discrimination efficiency of 98%. The polarization interference led to selective polarization excitation of the reflection spectra, and the calculated phase sensitivity agreed with the experimental results.

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