Measurement device and method for fiber loop fusion point reflection in photonic bandgap fiber gyroscope

Abstract

The invention discloses a measurement device and method for fiber loop fusion point reflection in a photonic bandgap fiber gyroscope. The measurement device comprises a laser source, a coupler, a Y-waveguide, a photonic bandgap fiber loop, a detector, a signal generator and an oscilloscope. An output tail fiber of the laser source is in butt joint with a tail fiber O1 of the coupler through a flange, an end O2 of the coupler is welded with a tail fiber of the detector in a fusion manner, an end O3 of the coupler is welded with an input tail fiber of the Y-waveguide in a fusion manner, and an output tail fiber of the Y-waveguide is provided with an end face A and an end face B. According to measurement requirements, the end face A or end face B is selected to be welded with a tail fiber of the photonic bandgap fiber loop in a fusion manner, and a fusion point is A or B. The signal generator provides a modulating signal to the Y-waveguide, and the oscilloscope is used for detecting signals of the detector. The measurement method for fusion point reflection of the photonic bandgap fiber gyroscope adopts sawtooth wave modulation. Reflection of the fiber fusion point can be measured in real time during fusion welding, and online quality inspection of the fusion point is realized.

Description

technical field [0001] The invention relates to a measurement device and method for reflection of an optical fiber ring welding point in a photonic bandgap optical fiber gyroscope, and belongs to the technical field of optical fiber gyroscopes. Background technique [0002] As a new type of inertial angular velocity sensor that is developing extremely rapidly, fiber optic gyroscope has its unique technical and performance advantages, such as all-solid-state structure, high reliability, long life; fast start-up speed, short response time; large measurement range and wide dynamic range ; Anti-shock, vibration, chemical corrosion resistance; small size, light weight, low cost; suitable for mass production, etc., have been widely used in various fields. [0003] Photonic bandgap fiber is a new type of optical fiber based on the photonic bandgap effect. A two-dimensional photonic crystal material that confines light waves is formed by periodically arranging silica and air holes, ...

AI Technical Summary

Problems solved by technology

Due to the limited spatial resolution of OTDR, this test method is not accurate enough. At the same time, when both ends of the fiber ring are fused with the Y waveguide pigtail, the optical path is closed, and the melting point reflection cannot be tested by OTDR.

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