title: [Study on the axial strain sensor of birefringence photonic crystal fiber loop mirror based on the absolute integral of the monitoring peak].
abstract: In the present paper, the theoretical expression of the wavelength change and the axial strain of birefringence fiber loop mirror is developed. The theoretical result shows that the axial strain sensitivity of birefringence photonic crystal fiber loop mirror is much lower than conventional birefringence fiber loop mirror. It is difficult to measure the axial strain by monitoring the wavelength change of birefringence photonic crystal fiber loop mirror, and it is easy to cause the measurement error because the output spectrum is not perfectly smooth. The different strain spectrum of birefringence photonic crystal fiber loop mirror was measured experimentally by an optical spectrum analyzer. The measured spectrum was analysed. The results show that the absolute integral of the monitoring peak decreases with increasing strain and the absolute integral is linear versus strain. Based on the above results, it is proposed that the axial strain can be measured by monitoring the absolute integral of the monitoring peak in this paper. The absolute integral of the monitoring peak is a comprehensive index which can indicate the light intensity of different wavelength. This method of monitoring the absolute integral of the monitoring peak to measure the axial strain can not only overcome the difficulty of monitoring the wavelength change of birefringence photonic crystal fiber loop mirror, but also reduce the measurement error caused by the unsmooth output spectrum.
authors.affiliation: State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronau-tic, Nanjing 210016, China. jiangying0510@sina.com
authors.forename: Ying
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronau-tic, Nanjing 210016, China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zeng
authors.affiliation: State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronau-tic, Nanjing 210016, China.
authors.forename: Da-Kai
authors.initials: DK
authors.lastname: Liang
authors.affiliation: School of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Xue-Liang
authors.initials: XL
authors.lastname: Wang
authors.affiliation: School of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing 210037, China.
authors.forename: Xiao-Yu
authors.initials: XY
authors.lastname: Ni
authors.affiliation: State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronau-tic, Nanjing 210016, China.
authors.forename: Xiao-Yan
authors.initials: XY
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronau-tic, Nanjing 210016, China.
authors.forename: Ji-Feng
authors.initials: JF
authors.lastname: Li
authors.affiliation: Fiberhome Telecommunication Technologies Co. Ltd, Wuhan 430074, China.
authors.forename: Wen-Yong
authors.initials: WY
authors.lastname: Luo