Resonator optical gyroscope based on resonant intracavity modulation

Abstract

The invention discloses a resonator optical gyroscope based on resonant intracavity modulation. The resonator optical gyroscope comprises a light source, an isolator, a coupler C0, a coupler C1, a coupler C2, an inactive Y-branch coupler, a resonant cavity, a modulator, a first prober, a second prober, a first signal processing circuit, a second signal processing circuit and a modulation signal output circuit. The gyroscope provided by the invention uses the resonant intracavity modulation to replace an external two-circuit modulator structure, so that a gyroscope model is simplified and the integration degree of the gyroscope is greatly improved. The resonance characteristic of the resonant cavity provided by the invention enhances the modulation characteristic, so that a modulation voltage is reduced. Furthermore, the gyroscope provided by the invention is only provided with a modulation arm, however, a double modulation effect is achieved and the power consumption of the system is reduced. The modulation manner corresponding to the intracavity modulation provided by the invention uses a simple periodic square wave modulation curve, so that the non-linear error of the triangular wave is removed when being compared with the triangular wave modulation curve which is commonly used in external modulation; the asymmetry of a waveform is avoided; the gyroscope is beneficial to improvement on the entire precision of the gyroscope.

Description

technical field [0001] The invention relates to a resonant optical gyroscope based on modulation in a resonant cavity, and belongs to the technical field of photoelectric sensing such as optical gyroscopes. Background technique [0002] At present, for optical sensors, how to reduce the structural size of devices, reduce device manufacturing costs, and improve the integration of optical sensors are high-tech pursuits in the world, especially in developed countries, governments, scientific and technological circles, and industries. [0003] At present, resonant optical gyroscopes mostly use figure 1 As shown in the system structure diagram, the light emitted by the light source is divided into two identical beams through the Y branch. The modulation signal output circuit outputs the modulation signal to the modulator PM1 and the modulator PM2, wherein the light in the clockwise direction (CW) passes through the modulator PM1 to adjust the transmission light frequency offset ...

Images