Thermal Sensitivity of the Birefringence of Air-Core Fibers and Implications for the RFOG

摘要: We present an analytical model of the drift in resonant fiber optic gyroscope (RFOG) caused by thermally induced changes beat length ${\rm L_{B}(T)}$ and find that relevant metric for thermal-drift performance is not dL_{B}/dT}$ but rather ${\rm(1/L_{B}^{2})dL_{B}/dT}$ . This disfavors conventional solid-core PM fibers which L_{B}}$ very short large. Because air core hollow-core does support strains associated with differential thermal expansion fibers, birefringence should be more stable than a correspondingly smaller (1/L_{B}^{2})dL_{B}/dT}$ To identify relative merits different types RFOG, we measure variety air-core recording shift resonance frequencies all-fiber ring resonator when its temperature changed. offers 270-fold improvement coefficient compared to Panda fiber.