Donko A, Beresna M, Jung Y, Hayes J, Richardson D J, Brambilla G
Opt Express. 2018 Jan 22;26(2):2039-2044. doi: 10.1364/OE.26.002039.
Four 3rd order fiber Bragg gratings were inscribed into separate cores of a 7 core multi-core fiber using the point-by-point inscription technique. A 1030 nm, 206 ± 5 fs laser was used, operating at a frequency of 1 kHz and pulse energy of 2.1 ± 0.2 µJ. Independent Bragg resonances at λ = 1541.01 ± 0.02, 1547.82 ± 0.02, 1532.66 ± 0.02, and 1537.42 ± 0.02 nm and extinction ratios of 13.97 ± 0.4, 16.02 ± 0.4, 10.08 ± 0.4 and 13.40 ± 0.4 dB were recorded. Our data analysis shows that refractive index changes, Δn, of the order 10 were induced. Core-specific inscription of fiber Bragg gratings in a multi-core fiber can provide a flexible and versatile platform to address the needs of recent space division multiplexed transmission and optical sensor networks.
使用逐点写入技术，在一根7芯多芯光纤的不同纤芯中写入了4个三阶光纤布拉格光栅。使用了一台1030 nm、206±5 fs的激光器，其工作频率为1 kHz，脉冲能量为2.1±0.2 μJ。记录到在λ = 1541.01±0.02、1547.82±0.02、1532.66±0.02和1537.42±0.02 nm处的独立布拉格共振，消光比分别为13.97±0.4、16.02±0.4、10.08±0.4和13.40±0.4 dB。我们的数据分析表明，诱导产生了10量级的折射率变化Δn。在多芯光纤中进行纤芯特定的光纤布拉格光栅写入，可以提供一个灵活且通用的平台，以满足近期空分复用传输和光学传感器网络的需求。
