2019/08/21 by Nabil Md Rakinul Hoque, Hoque, Nabil Md Rakinul, Lingze Duan +1
Engineering · Physics and Astronomy · #Advanced Fiber Laser Technologies #Advanced Fiber Optic Sensors #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Photonic and Optical Devices
paper · pdf · doi:10.48550/arxiv.1908.08595
openalex publication_date 2019/08/21 · openalex created_date 2019/08/29 · openalex updated_date 2026/07/28
Ultrahigh-resolution fiber-optic sensing has been demonstrated with a meter-long, high-finesse fiber Fabry-Perot interferometer (FFPI). The main technical challenge of large, environment-induced resonance frequency drift is addressed by locking the interrogation laser to a similar meter-long FFPI, which, along with the FFPI sensor, is thermally and mechanically isolated from the ambient. A nominal, noise-limited strain resolution of 800 fε /sqrt(Hz) has been achieved within 1 to 100 Hz. Strain resolution further improves to 75 fε /sqrt(Hz) at 1 kHz, 60 fε /sqrt(Hz) at 2 kHz and 40 fε /sqrt(Hz) at 23 kHz, demonstrating comparable or even better resolutions than proven techniques such as π-phase-shifted and slow-light fiber Bragg gratings. Limitations of the current system are analyzed and improvement strategies are presented. The work lays out a feasible path toward ultrahigh-resolution fiber-optic sensing based on long FFPIs.