Fiber-Optic Silicon Fabry-Perot Interferometric Bolometer: The Influence of Mechanical Vibration and Magnetic Field

Qiwen Sheng, Guigen Liu, Nezam Uddin, Matthew L. Reinke, Ming Han

Research output: Contribution to journalArticlepeer-review

Abstract

Plasma radiation plays an important role in the operation and control of magnetic confinement fusion and is typically measured by bolometers. Here, we study the influence of mechanical vibration and magnetic field, which are typically present in magnetic confinement fusion devices, on the performance of a fiber-optic bolometer (FOB) based on silicon Fabry-Perot interferometer (FPI) demodulated by a scanning diode laser. It is found that both the vibration and magnetic field could cause large noise due to the birefringence of the silicon FPI. To mitigate the birefringence effects, we demonstrated two effective methods: polarization maintaining FOB and polarization scrambling. We show that two methods can be effective in mitigating the effect caused by the sensor birefringence: (1) replacing the regular single-mode fiber in the FOB system with polarization-maintaining fiber and (2) using a polarization scrambler after the laser source. For both methods, no significant increase in the noise was observed in the vibration and magnetic field tests. Our research highlights the importance of the polarization management for the FOB systems toward their practical applications in magnetic-confinement fusion systems.

Original languageEnglish (US)
Article number8964373
Pages (from-to)2547-2554
Number of pages8
JournalJournal of Lightwave Technology
Volume38
Issue number8
DOIs
StatePublished - Apr 15 2020

Keywords

  • Birefringence
  • bolometers
  • fabry-perot interfero-meter
  • optical fiber sensors
  • plasma applications
  • temperature measurement

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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