Zhou Xiaojun, Shi Shenghui, Zhang Zhiyao, Zou Jun, Liu Yong
School of Optoelectronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China.
Opt Express. 2011 Mar 28;19(7):6253-9. doi: 10.1364/OE.19.006253.
A band-pass filter based on mechanically-induced multi-π-shifted long-period fiber gratings is proposed. The pass band width of the filter depends on the number N of the sub-gratings divided by π-shifts in the long-period fiber grating. The depth of the two lateral rejection bands can be changed by the amount of pressure applied to the fiber. This paper demonstrates a multi-π-shifted long-period fiber grating created by pressing a fiber between two periodically grooved plates. For N = 7 and LP12 mode coupling, the extinction ratio is 22.22 dB, and the pass band loss is 0.85 dB. For LP12 mode coupling, the pass band width varies from 14.23 nm to 39.31 nm when N increases from 2 to 10.
提出了一种基于机械诱导多π相移长周期光纤光栅的带通滤波器。该滤波器的通带宽度取决于长周期光纤光栅中被π相移分割的子光栅数量N。两个横向抑制带的深度可以通过施加在光纤上的压力大小来改变。本文展示了一种通过将光纤夹在两个周期性开槽的平板之间而产生的多π相移长周期光纤光栅。对于N = 7和LP12模式耦合，消光比为22.22 dB，通带损耗为0.85 dB。对于LP12模式耦合，当N从2增加到10时，通带宽度从14.23 nm变化到39.31 nm。
