%A Cong YIN, Xiaojun ZHOU, Zhiyao ZHANG, Shenghui SHI, Sixian JIANG, Liu LIU, Tingpeng LUO, Yong LIU %T Second-order optical differentiator using mechanically-induced LPFG with a single π-shift %0 Journal Article %D 2012 %J Front. Optoelectron. %J Frontiers of Optoelectronics %@ 2095-2759 %R 10.1007/s12200-012-0272-z %P 261-265 %V 5 %N 3 %U {https://journal.hep.com.cn/foe/EN/10.1007/s12200-012-0272-z %8 2012-09-05 %X
An all-optical second-order temporal differentiator using a mechanically-induced long-period fiber grating (MI-LPFG) with a single π-shift was demonstrated. The MI-LPFG was created by pressing a fiber between two periodically grooved plates with a π-shift located at the 3/4 length from the input end of LPFG. The coupling coefficient (