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Resonator Fiber-Optic Gyroscope (RFOG) performance has hitherto been limited by non-linearity, modal impurity, and backscattering in the sensing fibers. The use of hollow-core fiber (HCF) effectively reduces non-linearity, but the complex interplay among glass and air-guided modes in conventional HCF technologies can severely exacerbate RFOG instability. By employing high-performance nested anti-resonant nodeless fiber, we demonstrate long-term stability in a hollow-fiber RFOG of 0.05 deg/hr, nearing the levels required for civil aircraft navigation. This represents a 3X improvement over any prior hollow-core RFOG and a factor of 500X over any prior result at integration times longer than 1 hour.

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Fiber-optic gyroscopes (FOGs) are under development at Honeywell as the primary next generation inertial sensor. The open-loop FOG technology has been successfully transitioned to production for attitude heading reference systems (AHRS) and the results ofthis effort are reported. New developments in closedloop FOG technology aimed at high performance space applications and at navigation grade aviation applications, are underway. In the former case, results on a high precision FOG are reported. In the latter case, special emphasis is placed on improvements of depolarized FOG technology, which promises to produce a low cost navigation grade sensor.