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Amplitude template device and method for rapidly adjusting bandwidth of chirped fiber grating

A chirped fiber grating and amplitude technology, applied in cladding fiber, optical waveguide light guide, optics, etc., can solve problems such as inaccuracy and inconvenient bandwidth adjustment, and achieve broad application prospects, easy implementation, and good performance.

Active Publication Date: 2022-07-22
FUZHOU PHOTOP QPTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the problems in the prior art, the purpose of the present invention is to propose a method that can solve the inconvenient and inaccurate shortcomings of bandwidth adjustment when writing fiber gratings, and also improve the writing efficiency and writing accuracy of fiber gratings, and reduce the Amplitude Template Apparatus and Method for Rapid Adjustment of Chirped Fiber Bragg Grating Bandwidth at Low Manufacturing Cost

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  • Amplitude template device and method for rapidly adjusting bandwidth of chirped fiber grating
  • Amplitude template device and method for rapidly adjusting bandwidth of chirped fiber grating
  • Amplitude template device and method for rapidly adjusting bandwidth of chirped fiber grating

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Experimental program
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Embodiment 1

[0042] by application figure 1 The illustrated amplitude template device of the present invention produces a chirped fiber grating with a bandwidth of 2.5 nm, a reflectivity >99%, a center wavelength of 1065 nm, and a side mode suppression ratio greater than 20 dB.

[0043] combine figure 1 , figure 2 and Figure 4 As shown in the figure, the material of the base 010 of the pair of amplitude templates 060 and 070 is quartz. As one of the preferred methods, both ends of the pair of amplitude templates 060 and 070 are provided with air anti-reflection films 020 that resist laser damage. The reflectance at 244 nm wavelength is less than 0.2%.

[0044] In addition, one end face of the pair of amplitude templates 060 and 070 is provided with a layer of graded transmittance film 030 that resists laser damage. The graded transmittance of the graded transmittance film or the graded reflectance of the graded reflectance film The change trend is linear, that is, its linear change r...

Embodiment 2

[0052] by application figure 1 The illustrated amplitude template device of the present invention produces a chirped fiber grating with a bandwidth of 1.9 nm, a reflectivity of >99%, a center wavelength of 1064.7 nm, and a side mode suppression ratio greater than 20 dB.

[0053] This embodiment is substantially the same as Embodiment 1, and the difference lies in that by adjusting the dislocation of a pair of amplitude templates 060 and 070, the length of the dislocation region 080 of the amplitude templates 060 and 070 is 5 mm.

[0054] combine further Image 6 As shown, the method steps of using the amplitude template device to fabricate the chirped fiber grating are as follows:

[0055] (1) Put a pair of amplitude templates 060 and 070 into the embedding grooves of the fixed template bracket 180 and the movable template bracket 200 respectively, and make the end face of the gradient transmittance film layer 030 face outward;

[0056] (2) The amplitude template device 130 ...

Embodiment 3

[0060] by application figure 1 The illustrated amplitude template device of the present invention produces a chirped fiber grating with a bandwidth of 2.4 nm, a reflectivity >99%, a center wavelength of 1065 nm, and a side mode suppression ratio greater than 20 dB.

[0061] This embodiment is substantially the same as Embodiment 1, the difference lies in that one end face of the pair of amplitude templates 060 and 070 is provided with a layer of graded transmittance film layer 030 that resists laser damage. The change trend of the gradient reflectivity of the transmittance or gradient reflectivity film layer 030 is Gaussian, and the roll-off length is 2mm (coefficient 0.8). The length of the dislocation area 080 of 060 and 070 is 6 mm.

[0062] combine further Image 6 As shown, the method steps of using the amplitude template device to fabricate the chirped fiber grating are as follows:

[0063] (1) Put a pair of amplitude templates 060 and 070 into the embedding grooves o...

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Abstract

The invention discloses an amplitude template device and method for rapidly adjusting the bandwidth of a chirped fiber grating. On one end face, a pair of amplitude templates are oppositely arranged and embedded on the movable template bracket and the fixed template bracket respectively, and the mobile driving mechanism is arranged on the fixed template bracket and connected with the movable template bracket and drives the movable template bracket to slide on the fixed template bracket. , so that the amplitude templates on the fixed template bracket and the movable template bracket are misaligned or aligned. By combining the corresponding methods, the solution of the present invention can solve the inconvenience and inaccuracy of bandwidth adjustment when writing fiber gratings in the prior art. The writing efficiency and writing accuracy of the fiber grating are improved, and the manufacturing cost of the fiber grating is reduced.

Description

technical field [0001] The invention relates to the field of chirped fiber grating devices for fiber lasers, fiber sensors and fiber filters in optical communication, in particular to an amplitude template device and method for rapidly adjusting the bandwidth of chirped fiber gratings. Background technique [0002] Fiber grating is a low-loss device with wavelength selection function, which is formed by using the photosensitivity of optical fiber materials to produce axial periodic changes in the refractive index of the fiber core through ultraviolet light exposure. It also has the advantages of small size, full compatibility with optical fibers, and can be embedded in smart materials. It has been widely studied and applied in the fields of optical communication, fiber lasers, fiber sensors, and fiber filters. [0003] In 1978, Hill et al. of Holdtaihua, Canada first discovered the photosensitivity of optical fibers and successfully applied them to the development of high re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B6/02
CPCG02B6/02142
Inventor 蔡光明林磊郑彬余忠伟
Owner FUZHOU PHOTOP QPTICS CO LTD