Real-time monitoring device for online writing weak optical fiber Bragg grating and application method thereof

Abstract

The invention provides a real-time monitoring device for online writing weak optical fiber Bragg grating and an application method thereof. The real-time monitoring device comprises an input optical fiber, a stator, a rotor, shift levers, a shift cylinder, an output optical fiber, a V-shaped slot quick connector, a motor, a take-up reel, a slideway, a light source, a spectrometer and a Y-shaped splitter, wherein the stator is supported on the slideway; one end of the stator is connected with the input optical fiber; the rotor is connected with the output optical fiber; the stator and the rotor can transmit light by a noncontact coupling way; the two shift levers are symmetrically arranged on the rotor up and down; two strip-shaped slots are symmetrically arranged on the shift cylinder up and down; the shift levers can pass in and out of the strip-shaped slots of the shift cylinder; the shift cylinder is fixed on the take-up reel that is fixed on a motor shaft; the V-shaped slot quick connector is fixed at the edge of the take-up reel; the output optical fiber passes through the strip-shaped slots of the shift cylinder, is butt-jointed and positioned with an optical fiber, on the take-up reel, in the V-shaped slot quick connector and then is clamped; one end of the Y-shaped splitter is connected with the light source and the spectrometer respectively; and the other end of the Y-shaped splitter is connected with the input optical fiber 1. The device is used for online monitoring of a write-in state of the weak optical fiber Bragg grating.

Description

technical field [0001] The invention relates to a real-time monitoring device for writing weak optical fiber gratings online and an application method thereof. The invention is mainly used for real-time on-line monitoring of the writing condition of weak gratings during the drawing process of optical fibers, and belongs to the technical field of optical fiber connections and sensors. technical background [0002] The weak fiber grating can be used as a filter to filter the noise of the amplified self-emitting optical amplifier before the signal is processed, and it is better than the F-P filter in improving the signal-to-noise ratio of the output signal. This filter has almost no intersymbol interference, and does not have a long fading tail like the pulse from the F-P transmissive filter, which avoids the occurrence of false detection. [0003] Another important application of weak fiber gratings is in the health monitoring of composite materials. Modern design is moving ...

AI Technical Summary

Problems solved by technology

One is that the UV-absorbing optical fiber polymer coating must be stripped during the conventional fiber grating manufacturing process, which will cause additional damage to the optical fiber and make it difficult to ensure the strength and integrity of the optical fiber grating

The second is that the above three methods are difficult to produce a large number of fiber gratings on the same optical fiber in a short period of time.

Therefore, how to export the signal and online monitor the writing status of the weak fiber grating has become a technical bottleneck

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