Title :
Second-Order Optical Differentiator Based on a Mechanically-Induced LPFG with a Single pi-Shift
Author :
Yin, Cong ; Zhou, Xiaojun ; Zhang, Zhiyao ; Shi, Shenghui ; Liu, Yong
Author_Institution :
Sch. of Opto-Electron. Inf., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
An all-optical second-order temporal differentiator based on a mechanically-induced long-period fiber grating (MI-LPFG) with a single π-shift is demonstrated. The MI-LPFG is 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 (κ) can be adjusted through changing the pressure applied on the fiber. The experimental results show that the transfer function of the proposed MI-LPFG can be adjusted to be close to the ideal transfer function of a second-order differentiator. The differential performance of the designed differentiator to a Gaussian pulse is also analyzed.
Keywords :
Bragg gratings; optical design techniques; optical fibres; optical transfer function; Gaussian pulse; MI-LPFG; all-optical second-order temporal differentiator; coupling coefficient; differential performance; mechanically-induced LPFG; mechanically-induced long-period fiber grating; periodically grooved plates; single π-shift; transfer function; Fiber nonlinear optics; Optical fibers; Optical filters; Optical pulses; Optical resonators;
Conference_Titel :
Photonics and Optoelectronics (SOPO), 2012 Symposium on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4577-0909-8
DOI :
10.1109/SOPO.2012.6270512
