Fabrication of long-period fiber gratings using low-pressure mercury lamp: Shortening of exposure time
Fabrication of long-period fiber gratings using low-pressure mercury lamp: Shortening of exposure time
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DOI：
10.7567/jjap.53.08me02
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发表时间：
2014-07
影响因子：
1.5
通讯作者：
T. Mizunami;T. Fujiyoshi
中科院分区：
文献类型：
--
作者：
T. Mizunami;T. Fujiyoshi
长周期光纤光栅是用低压汞灯代替激光或精细定位系统制成的。采用载氢ge - b共掺光纤。通过增加光栅长度来缩短曝光时间。当光栅周期为212µm时，当光栅长度为30 mm时，曝光时间为12 h，最大损耗为20 dB，是光栅长度为20 mm时的2/3。曝光时间缩短至2/3，光栅周期为460µm，曝光时间为4.5 h，损耗为10 dB。当氢浓度为上述实验的2/3时，曝光时间增加1.5倍，共振波长短于氢浓度较高的实验。在212µm的光栅周期内，折射率调制速率为4.3 × 10−5/h。还测量了温度和应变敏感性。212µm光栅周期的温度灵敏度和应变灵敏度均高于460µm光栅周期的温度灵敏度和应变灵敏度。
Long-period fiber gratings were fabricated by exposure to a low-pressure mercury lamp instead of using a laser or a fine positioning system. A hydrogen-loaded Ge–B-codoped fiber was used. Shortening of the exposure time was studied by increasing the grating length. For a grating period of 212 µm, a maximum loss of 20 dB was obtained with a grating length of 30 mm for an exposure time of 12 h. This time was 2/3 that in the case of a grating length of 20 mm. Shortening of the exposure time to 2/3 was also achieved with the grating period of 460 µm, and a 10 dB loss was obtained by exposure for 4.5 h. Fabrication after the outdiffusion of hydrogen was also studied. With a hydrogen concentration of 2/3 of the above experiments, the exposure time increased 1.5 times, and the resonance wavelengths were shorter than those with higher hydrogen concentrations. The growth rate of the refractive index modulation was 4.3 × 10−5/h peak to peak for a grating period of 212 µm. Temperature and strain sensitivities were also measured. Both the temperature and strain sensitivities of a grating period of 212 µm were higher than those of a grating period of 460 µm.