Novel integrated optical waveguide device for fiber-optic gyroscope

Abstract

The invention provides a novel integrated optical waveguide device for a fiber-optic gyroscope. The integrated optical waveguide device comprises a Y waveguide, a first integrated optical switch and a second integrated optical switch, wherein first ports of the first and second optical switches are connected with a first branch and a second branch of the Y waveguide respectively; fourth ports of the first and second optical switches are connected with two ports of a fiber-optic ring respectively; the Y waveguide is used for polarizing and dividing wide-spectrum light emitted from a light source in the fiber-optic gyroscope into two beams of polarized light in uniform amplitude so as to realize phase modulation, beam splitting and beam combination of light beams; and the first and second optical witches are used for selecting transmission ports of the light beams and controlling transmission paths of the light beams. With the adoption of the scheme, the novel integrated optical waveguide device for the fiber-optic gyroscope is designed on a same base material by adopting an integrated structure, the Y waveguide and the optical switches are symmetric and compact in design, and the optical waveguide device is very high in temperature consistence.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing and measurement, and in particular relates to a novel integrated optical waveguide device for an optical fiber gyroscope. Background technique [0002] As the key sensor of the new generation of high-precision inertial navigation system, fiber optic gyroscope has attracted much attention because of its high anti-interference and anti-shock capabilities. It has been used in military fields such as aerospace, ships, and missiles. The current way to increase the accuracy of fiber optic gyroscopes is to increase the length of the fiber optic ring, but the dynamic range of the gyroscope is greatly limited, and the bandwidth is also reduced. And with the increase of the length of the fiber ring, the winding process of the fiber ring becomes more complicated and more sensitive to the environment such as temperature and vibration, but the accuracy does not increase significantly with the in...

AI Technical Summary

Problems solved by technology

[0004] (1) The coupling ratio of the two couplers needs to be reasonably designed according to the number of times the light propagates in the fiber ring, and this process is difficult to realize;

[0005] (2) The transmission characteristics of the two couplers are poorly consistent in the full temperature environment (-40°C ~ 60°C), and the non-reciprocity introduced by this is very large and difficult to eliminate;

[0006] (3) In the process of optical transmission, due to the existence of the coupler, the energy loss is relatively large, which increases the difficulty of processing the subsequent optical signal;

[0008] (1) The transmission characteristics of the two acousto-optic switches are very poorly consistent in a full-temperature environment (-40°C to 60°C), and the non-reciprocity introduced by this is very large and difficult to eliminate;

[0009] (2) The response speed cannot reach the μs level, and it can only be assembled in separate parts, and the size is large, which is not suitable for the use of the overall fiber optic gyroscope

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