Self-injection locking resonant optical gyroscope and working method thereof

Abstract

The invention discloses a self-injection locking resonant optical gyroscope and a working method thereof and belongs to the technical field of optical gyroscopes. The existing resonant optical gyroscope is complex in structure and work. LD is used as a working light source so that the size of the optical gyroscope is reduced. The two LD working light sources share a passive ring resonator so thatnon-reciprocity noise is avoided. Compared with the existing resonant optical gyroscope, the self-injection locking resonant optical gyroscope mainly comprises conventional circuit elements such as circulators, isolators, couplers and resonators in the field of optical fiber technology and has a symmetrical and simple structure. The self-injection locking frequency stabilization method is free ofa modulated signal generator and power-based frequency stabilization. Lights transmitted by the two working light sources carry out resonance along opposite directions in the same passive ring resonator, and two resonance light beams transmitted along different directions are divided through a splitting coupler and are respectively used for frequency stabilization and gyro signal detection. The optical gyroscope has a simple structure and works in a simple work mode.

Description

technical field [0001] The invention relates to a self-injection locking resonant optical gyroscope and a working method thereof, belonging to the technical field of optical gyroscopes. Background technique [0002] The gyroscope is the angular velocity sensor of the carrier and the core component of the inertial navigation, inertial guidance and inertial measurement system. The outstanding advantage of optical gyroscopes is that they have no moving parts. Among them, the technologies of laser gyroscopes and interferometric fiber optic gyroscopes are relatively mature, and because of their high precision, they have a dominant position in the field of high-end gyroscopes. However, these two optical gyroscopes still have their shortcomings, such as large size and high price, which make them unable to meet the requirements of small size, light weight, and low cost for gyroscopes such as microsatellites, tactical missiles, car navigation, robots, and smart phones. . [0003] R...

AI Technical Summary

Problems solved by technology

However, this solution requires the use of a ring cavity with gain, which belongs to the laser gyro and works in an active manner. It requires two pump lasers and a seed laser, and the structure of the gyro is relatively complicated; in addition, compared to the gyro using a resonant cavity, Using two ring resonators in this scheme will inevitably increase a lot of non-reciprocal noise, such as temperature-induced changes in cavity length and refractive index, etc., thereby reducing the sensing accuracy and working stability of the gyroscope.

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