On-line monitoring system and method for ultra-long fiber grating writing

Abstract

The invention relates to an on-line monitoring system and method for ultra-long fiber grating inscribing. A first microscope and a second microscope are used for observing whether an inscribed grating exposure region in a fiber grating inscribing device is parallel to a mask layer; a tension meter is used for providing preset tensile forces for two ends of the inscribed grating exposure region; and a first gradienter and a second gradienter are used for monitoring whether the two ends of the inscribed grating exposure region are located on a same horizontal plane. An optical signal output terminal of a tuning source is connected with a first coupler; a first signal output terminal of the first coupler is connected with a circulator; the circulator is connected to an end portion of an inscribed fiber in the fiber grating inscribing device; the circulator is connected with a first input terminal of a second coupler; a second output terminal of the first coupler is connected with a second input terminal of the second coupler; and the output terminal of the second coupler is connected with an optical signal input terminal of a photoelectric detector. The manufactured grating has high precision and good spectral shape; and the consistency is high.

Description

technical field [0001] The invention relates to the technical field of fiber grating writing, in particular to an on-line monitoring system and method for ultra-long fiber grating writing. Background technique [0002] Fiber Bragg grating uses the photosensitivity of fiber material, that is, the interaction between incident photons and germanium ions in the fiber core causes a permanent change in the refractive index. This characteristic forms a spatial phase grating in the fiber core. Among them, the ultra-long fiber grating is It refers to the fiber grating with grating length ≥ 10cm. It is precisely because it has many unique advantages that it has broad application prospects in the fields of optical fiber communication and optical fiber sensing. Mask writing method. [0003] With the development of the technology for detecting the quality of fiber Bragg gratings, in recent years, many new methods have been proposed to detect the quality of ultra-long fiber Bragg gratin...

AI Technical Summary

Problems solved by technology

In this method, there is a loss in the process of converting the tension applied by the grating into the tension accepted by the tension sensor, so that the accuracy is not high, and the error needs to be reduced.

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