Research on the Linear Demodulation Range and Background Noise of Fiber-Optic Interferometer System

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Abstract
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.
Funding Information
  • Key R&D Program of Shandong Province (Major Technological Innovation Project) (2021CXGC010704, 2021JC02006, 2022TSGC2049, 2022PX002, 2022PY008, 2021KJ049, ZR2021LLZ014, 2019KJJ004, ZR2020LLZ010, ZR2020QF092, 62005137)
  • Innovation project of Computer Science and Technology of Qilu university of technology (2021CXGC010704, 2021JC02006, 2022TSGC2049, 2022PX002, 2022PY008, 2021KJ049, ZR2021LLZ014, 2019KJJ004, ZR2020LLZ010, ZR2020QF092, 62005137)
  • Innovation Project of Science and Technology SMES in Shandong Province (2021CXGC010704, 2021JC02006, 2022TSGC2049, 2022PX002, 2022PY008, 2021KJ049, ZR2021LLZ014, 2019KJJ004, ZR2020LLZ010, ZR2020QF092, 62005137)
  • Colleges and Universities Youth Talent Promotion Program of Shandong Province (Precision Instrument Science and Technology Innovation Team) (2021CXGC010704, 2021JC02006, 2022TSGC2049, 2022PX002, 2022PY008, 2021KJ049, ZR2021LLZ014, 2019KJJ004, ZR2020LLZ010, ZR2020QF092, 62005137)
  • Taishan Scholars Program (2021CXGC010704, 2021JC02006, 2022TSGC2049, 2022PX002, 2022PY008, 2021KJ049, ZR2021LLZ014, 2019KJJ004, ZR2020LLZ010, ZR2020QF092, 62005137)
  • Science, Education and Industry Integration Innovation Pilot Project of Qilu University of Technology (2021CXGC010704, 2021JC02006, 2022TSGC2049, 2022PX002, 2022PY008, 2021KJ049, ZR2021LLZ014, 2019KJJ004, ZR2020LLZ010, ZR2020QF092, 62005137)
  • Joint Natural Science Foundation of Shandong Province (2021CXGC010704, 2021JC02006, 2022TSGC2049, 2022PX002, 2022PY008, 2021KJ049, ZR2021LLZ014, 2019KJJ004, ZR2020LLZ010, ZR2020QF092, 62005137)
  • Colleges and Universities Youth Innovation and Technology Support Program of Shandong Province (2021CXGC010704, 2021JC02006, 2022TSGC2049, 2022PX002, 2022PY008, 2021KJ049, ZR2021LLZ014, 2019KJJ004, ZR2020LLZ010, ZR2020QF092, 62005137)
  • Natural Science Foundation of Shandong Province (2021CXGC010704, 2021JC02006, 2022TSGC2049, 2022PX002, 2022PY008, 2021KJ049, ZR2021LLZ014, 2019KJJ004, ZR2020LLZ010, ZR2020QF092, 62005137)
  • National Natural Science Foundation of China (2021CXGC010704, 2021JC02006, 2022TSGC2049, 2022PX002, 2022PY008, 2021KJ049, ZR2021LLZ014, 2019KJJ004, ZR2020LLZ010, ZR2020QF092, 62005137)

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