On-line optical fiber grating preparing system

Abstract

The invention relates to an on-line optical fiber grating preparing system, which comprises a wire drawing tower and a grating inscribing device, wherein the wire drawing tower comprises a wire drawing furnace and a prefabricated bar clamping feeding device arranged above the wire drawing furnace, a naked optical fiber diameter gauge is arranged under a furnace opening of the wire drawing furnace, the grating inscribing device is arranged under the naked optical fiber diameter gauge, an optical fiber coating curing device is arranged under the grating inscribing device along the vertical downward direction of the naked optical fiber, and a wire drawing take-up mechanism is arranged under the optical fiber coating curing device. The on-line optical fiber grating preparing system is characterized in that the grating inscribing device comprises a phase mask plate and a 193nm excimer laser, wherein the phase mask plate is arranged in a way of being next to the center of the naked optical fiber, the output end of the 193nm excimer laser is alternately provided with a diaphragm and a lens, the 193nm excimer laser outputs single-pulse laser beams, and the single-pulse laser beams are illuminated onto the phase mask plate through diaphragm shaping and lens focusing. The on-line optical fiber grating preparing system has the advantages that the arrangement is reasonable, the performance is stable, the manufacturing efficiency is high, in addition, the precision of the manufactured grating is high, the grating spectral form is good, and the consistency is high.

Description

technical field [0001] The invention relates to an online optical fiber grating preparation system, which belongs to the technical field of optical fiber grating preparation. Background technique [0002] Fiber Bragg grating is currently one of the most representative and promising fiber optic passive devices. It has the advantages of small insertion loss and high extinction ratio. There are a wide range of uses. In the field of fiber optic sensing, the advantages of fiber gratings are particularly prominent, and large-scale multiplexing will be able to form long-distance multi-parameter fiber grating sensing networks. [0003] A large number of fiber gratings are connected in series to form an array, which is the basis of a large-scale fiber grating sensor network. The traditional method of preparing fiber grating arrays is to first cut the finished optical fiber into sections, peel off the organic protective layer on the surface of the optical fiber, prepare the grating ...

AI Technical Summary

Problems solved by technology

[0005] However, there are still some problems in the existing dynamic on-line preparation system of fiber gratings: First, the preparation of gratings by optical splitting light path interference method is to change the Bragg wavelength written into the grating by rotating the angle of two mirrors

Since the Bragg wavelength is very sensitive to the angle of the mirror, controlling the wavelength accuracy within 1nm requires a high-performance control device, so the control is difficult, resulting in poor consistency of the grating; second, the optical path used for writing is long, requiring After multiple reflections and turnings, a good vibration isolation platform and a stable working environment are required, but in the actual operation process, there are many influencing factors, which will also affect the poor consistency of the grating; third, the writing light source is 248nm laser , the uniformity of the laser beam, the stability of the laser pulse, the stability of the laser beam aiming point, and the low coherence make the prepared grating spectral shape poor and poor in consistency, resulting in low quality of the grating array

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