[6p-PA4-1~9] 3.14 Optical control devices and optical fibers

[6p-PA4-4] Optical fiber length change measurement using Pound-Drever-Hall technique

〇Tomoyuki Uehara¹, Kenichiro Tsuji¹ (1.Nat. Def. Aca.)

Keywords:optical cavity, optical fiber, Pound-Drever-Hall technique

We have measured the change in optical path length of optical fiber by optical beat method for the purpose of active control of optical fiber length for microwave photonics. However, in this measurement, cycle slips of the phase occur in the measurement of the optical beat signal, so accurate change of the optical path length could not be measured. In this study, we stabilize the laser frequency to the resonance frequency of the fiber ring cavity using the Pound-Drever-Hall method and estimate the length change of the optical fiber inserted between the laser and the resonator.