Research on the Linear Demodulation Range and Background Noise of Fiber-Optic Interferometer System
Weitao Wang,
Chen Wang,
Shuai Qu,
Haifeng Qi,
Zhiqiang Song,
Pengbo Jiang,
Jian Guo,
Ying Shang,
Jiasheng Ni,
Gangding Peng
Affiliations
Weitao Wang
Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Chen Wang
Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Shuai Qu
Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Haifeng Qi
Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Zhiqiang Song
Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Pengbo Jiang
Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Jian Guo
Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Ying Shang
Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Jiasheng Ni
Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
Gangding Peng
Shandong Key Laboratory of Optical Fiber Sensing Technologies, Laser Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
The linear demodulation range and background noise of the Michelson interferometer system are investigated with a laser phase noise measurement system. We have theoretically and experimentally analyzed the performance of the interferometer system by changing the frequency modulation amplitude of the laser and the optical path difference (OPD) of the interferometer, respectively. It is shown that the linear demodulation range of the Michelson interferometer system is finite, which depends on the parameters of the system, such as the sample frequency, the delay time between two interferometer arms, and the system bandwidth. Furthermore, the experimental results indicate that the background noise of the interferometer system can be reduced by using a sufficiently long OPD so that the smaller true phase information can be detected with the demodulation system. The parameters of the measurement system could be optimized to satisfy the demand of the phase demodulation with different levels, which is of great significance for the phase monitoring interrogator, such as fiber-optical interferometer sensors and distributed acoustic sensors.
