Femtosecond inscription and thermal testing of Bragg gratings in high concentration (40 mol%) germania-doped optical fibre
Femtosecond inscription and thermal testing of Bragg gratings in high concentration (40 mol%) germania-doped optical fibre
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DOI：
10.1364/oe.25.032879
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发表时间：
2017-12-25
期刊：
影响因子：
3.8
通讯作者：
Brambilla, G.
中科院分区：
文献类型：
--
作者：
Donko, A.;Nunez-Velazquez, M.;Brambilla, G.
利用逐点红外飞秒激光刻写技术，在高浓度(40mol%)掺锗石英光纤上刻写了共振波长为1550.28+/-0.02 nm、消光比为25d B、带宽为1.10+/-0.02 nm的光纤布拉格光栅。在该波长下，高浓度锗掺杂石英光纤的归一化频率V接近或等于3.06，允许高阶模传输。随后，在1534.40+/-0.02和1535.78+/-0.02 nm处记录了两个额外的布拉格共振，分别对应于正向传播基模和反向传播基模的耦合。热测试显示，该格栅在800摄氏度的温度下稳定了30分钟。分析表明，该光栅的一阶和二阶系数分别为dlambda(B)/dt=11.1 pm/℃和d(2)lambda(B)/dt(2)=8.37×10(-3)pm(2)/℃-2。由光学学会根据知识共享署名4.0许可证的条款出版。
Using point-by-point infrared femtosecond laser inscription, a fibre Bragg grating with a resonance wavelength of 1550.28 +/- 0.02 nm, 25 dB extinction ratio, and 1.10 +/- 0.02 nm bandwidth (measured at first minima) was inscribed in a high concentration (40 mol%) germania-doped silica fibre. At this wavelength, the high concentration germania doped silica fibre had a normalized frequency of V similar or equal to 3.06 permitting higher order mode propagation. Subsequently, two additional Bragg resonances were recorded at 1534.40 +/- 0.02 and 1535.78 +/- 0.02 nm, corresponding to the coupling of the forward propagating fundamental mode and counter propagating HE21 and TM01/TE01, respectively. Thermal tests revealed the grating was stable up to 800 degrees C for 30 minutes. Analysis determined the grating had first and second order coefficients d lambda(B)/dT = 11.1 pm/degrees C and d(2)lambda(B)/dT(2) = 8.37 x 10(-3) pm(2)/degrees C-2 respectively. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License.