A type of encoded FBG array for use as an optical fiber tag is inscribed using a femtosecond laser line-by-line technique. Each tag included two labels and several codes formed by grating fragments with a predetermined length. Encoded information was characterized by measuring the backscattered optical signal. Local spectra from the internal grating fragments were then used to enlarge the encoding capacity or encrypt the encoded FBG. The insertion loss of the device is as low as <0.1 dB.

中文翻译：

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基于飞秒激光制作的编码光纤布拉格光栅的光纤标签

一种用作光纤标签的编码 FBG 阵列是使用飞秒激光逐行技术刻录的。每个标签包括两个标签和几个由预定长度的光栅片段形成的代码。编码信息的特征在于测量反向散射的光信号。然后使用来自内部光栅片段的局部光谱来扩大编码容量或加密编码的 FBG。该器件的插入损耗低至 <0.1 dB。