Research of rapid annealing of fiber Bragg gratings based on arc plasma
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摘要: 为了实现光纤布喇格光栅的快速退火，采用高温电弧等离子体热处理光纤光栅的方法，设计了相关实验进行验证。由实验可知，透射谱深度23dB、中心波长1552.09nm、3dB带宽0.2784nm的光纤光栅，经电弧等离子体放电扫描后，光纤光栅的透射谱深度减小，3dB带宽变窄，中心波长蓝移；随着重复扫描次数的增加，各参量变化趋势减缓，最终透射谱深度减小13dB、中心波长蓝移0.84nm、3dB带宽变窄0.1013nm；将电弧等离子体处理后的光纤光栅放入高温炉24h退火后，透射谱深度、中心波长、3dB带宽均不再发生变化。结果表明，将电弧等离子体用于光纤布喇格光栅的退火处理是可行的，并且具有周期短、涂覆层无损伤的优点。Abstract: In order to realize rapid annealing of fiber Bragg gratings, high temperature arc plasma heat treatment method was adopted. The related experiments were designed for verification. A fiber Bragg grating (FBG) with transmission spectrum depth of 23dB, central wavelength of 1552.09nm and 3dB bandwidth of 0.2784nm was scanned by arc plasma discharging. The results show that the transmission spectrum depth is reduced, the 3dB bandwidth is narrowed and the central wavelength shows blue shift. The variation trend of each parameter is slowed down with the increasing of the repetitive scanning times. Finally, the transmission spectrum depth is reduced by 13dB, the central wavelength is shifted blue by 0.84nm and the 3dB bandwidth is narrowed by 0.1013nm. After fiber grating is annealed in a high temperature furnace for 24h, the transmission spectrum depth, central wavelength and 3dB bandwidth remain the same. It is feasible to use arc plasma for the annealing of FBG with the advantages of short cycle and no damage of the coating layer.
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Keywords:
- gratings /
- annealing /
- arc plasma /
- spectral characteristics
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Figure 2. Relationship between transmission and wavelength of 14dB-FBG under different discharging times
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Figure 4. a—transmission of 14dB-FBG before and after annealing b—reflection of 14dB-FBG before and after annealing
Table 1 The grating parameters of Ⅰ-Ⅵ fiber gratings at different stages
label parameter original after discharging after annealing transmission/dB 14 11 Ⅰ wavelength/nm 1552.49 1551.74 3dB bandwidth/nm 0.2054 0.1818 transmission/dB 14 12 11 Ⅱ wavelength/nm 1552.84 1552.8 1552.07 3dB bandwidth/nm 0.2029 0.1895 0.1774 transmission/dB 14 10 10 Ⅲ wavelength/nm 1552.33 1552.22 1551.54 3dB bandwidth/nm 0.2097 0.1758 0.1763 transmission/dB 14 8 8 Ⅳ wavelength/nm 1552.89 1552.75 1552.08 3dB bandwidth/nm 0.205 0.1574 0.159 transmission/dB 14 6 8 Ⅴ wavelength/nm 1552.61 1552.36 1552.2 3dB bandwidth/nm 0.1942 0.1411 0.1405 transmission/dB 14 4 4 Ⅵ wavelength/nm 1552.58 1552.17 1552.14 3dB bandwidth/nm 0.2012 0.1306 0.1301 
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