We have demonstrated the inscription of Bragg gratings into five individual cores of a seven core fiber using small spot direct UV writing. With this technique, we defined spectrally multiplexed Bragg gratings consecutively in separate cores as well as spectrally multiplexed gratings at the same longitudinal location in different cores. The effect of bending on the optical spectrum was evaluated to allow the differentiation between cross-exposure and cross-talk, and an alignment process to reduce cross-exposure by 13 dB was found.

中文翻译：

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使用小光斑直接UV写入，在光学多芯光纤中对光谱多路复用的布拉格光栅进行个别刻写。

我们已经证明了使用小光斑直接UV写入将布拉格光栅刻印到7芯光纤的5个独立芯中。通过这种技术，我们在单独的磁芯中连续定义了光谱复用的布拉格光栅，以及在不同磁芯中相同纵向位置处的光谱复用的光栅。评估弯曲对光谱的影响，以便区分交叉曝光和串扰，并发现了将交叉曝光减少13 dB的对准工艺。