Silicon optical coupling assembly, silicon optical integrated module and integrated resonant fiber-optic gyroscope

Abstract

The invention relates to a silicon optical coupling assembly, a silicon optical integrated module and an integrated resonant fiber-optic gyroscope. The integrated resonant fiber-optic gyroscope comprises a silicon light integration module and a photonic crystal fiber. An integrated light source in the silicon optical integration module emits light, the light is divided into two paths from the waveguide to the integrated Y waveguide, and then the light reaches the silicon optical coupling assembly after passing through the integrated optical modulator; a part of light enters the detector through the silicon optical coupling assembly, and the other light is coupled into the photonic crystal fiber and then enters the fiber from the other end through the silicon optical coupling assembly to form circulating light, and part of the circulating light is reflected into the detector. After the integrated optical modulator receives feedback of the detector, optical frequency shift is locked on aforward and reverse resonance peak, a frequency shift difference value is a gyro output signal, and a position error is compensated through the lens and the optical fiber control assembly so as to reduce cavity loss. The silicon optical coupling assembly has the characteristics of no melting point and integration, miniaturization of the gyroscope is facilitated, the signal-to-noise ratio of the gyroscope is high, and the gyroscope has high practical application value.

Description

Technical field [0001] The present invention pertains to a silicon photonics technique, to a silicon optical coupling assembly, integrated silicon optical modules and integrated resonator fiber optic gyro. Background technique [0002] Vibration resonator fiber optic gyro (Resonator Fiber Optic Gyro, RFOG) is an angular velocity sensor using the Sagnac effect optical resonant cavity frequency difference measured clockwise and counterclockwise light beams to obtain angular velocity information. The gyro operating principle of combining high sensitivity resonator laser gyroscope on the interferometric fiber optic gyro and a multi-turn optical paths of these two advantages, high-precision measurement can be realized in a small volume, small size has the potential next-level navigation gyro. [0003] Resonator fiber optic gyro main device has a light source, a coupler, optical modulators, optical detectors, optical fibers, now commonly used way of connecting each welded fiber devices...

AI Technical Summary

Problems solved by technology

[0004]In order to improve the integration of gyroscopes, researchers usually choose smaller fiber optic devices, but affected by the manufacturing process and fusion points of fiber optic devices, resonant fiber optic gyroscopes Cannot be further miniaturized

In terms of new optical fiber applications, researchers have fused the photonic crystal fiber and the existing coupler tail fiber to obtain a fiber resonator that not only has a large loss, but also cannot avoid the noise error introduced by the fusion point.

In addition, due to the fragility of the fiber at the fusion point, its large minimum bending radius also limits the miniaturization of the fiber resonator

Therefore, the current gyro solution based on fiber optic device fusion cannot better meet the requirements of gyro miniaturization, integration, and future large-scale and low-cost production, and is not suitable for photonic crystal fibers.

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