A Brillouin ring laser comprises a fiber optic resonator formed from a loop (14) of fiber optic material (10) and a fiber optic directional coupler (20) for optically closing the loop (14).

Brillouin ring laser

A fiber optic sensor comprises a length of optical fiber, forming a loop, and a fiber optic directional coupler for optically closing the loop. The loop and coupler form a resonant cavity for light circulating therethrough. A PZT cylinder, about which the fiber loop is wrapped, is utilized to control the total round trip phase delay of the circulating light, and thus, control the intensity of the optical output signal. The phase delay is adjusted to a point where the optical output signal is at maximum sensitivity to changes in phase. When the fiber loop is exposed to, e.g., acoustic waves, the loop length changes correspondingly, thereby causing the phase delay, and thus, the optical output signal to vary. By detecting variations in output signal intensity, the frequency and intensity of the acoustic waves may be determined. The sensor also includes a feedback system for stabilizing the fiber loop against low frequency thermal drift.

Stabilized fiber optic sensor

Revue comprenant quinze articles d'auteurs differents portant sur la technologie des gyroscopes

Inertial technology for the future

A fiber optic resonator comprises a single strand of optical fiber forming a loop and a fiber optic directional coupler for optically closing the loop. The length of the loop is selected to cooperate with the phase shift of the coupler to provide a resonant cavity, and the coupling constant is selected to provide full or maximum resonance with zero output power.

Fiber optic resonator

We build a resonant fiber optic gyro based on Kagome hollow-core fiber. A semi-bulk cavity architecture based on an 18-m-long Kagome fiber permits achieving a cavity finesse of 23 with a resonance linewidth of 700 kHz. An optimized Pound–Drever–Hall servo-locking scheme is used to probe the cavity in reflection. Closed-loop operation of the gyroscope permits reaching an angular random walk as small as 0.004°/h and a bias stability of 0.45°/h over 0.5 s of integration time.

https://hal.archives-ouvertes.fr/hal-02107650/document

Rotation measurements using a resonant fiber optic gyroscope based on Kagome fiber.

The drift performance of an optical rotation sensor employing a passive ring cavity is presented. With a square cavity of about 17 cm on a side, and a 1 mW external laser, the rms fluctuation in the measurement of rotation was 0.45°/hour for an integration time of 1 second. This is consistent with the shot-noise-limited performance expected for the present setup.

Passive Cavity Optical Rotation Sensor

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Passive Cavity Optical Rotation Sensor