Second-order optical differentiator using mechanically-induced LPFG with a single π-shift

doi:10.1007/s12200-012-0272-z

Front Optoelec

2012, Vol. 5

Issue (3) : 261-265 https://doi.org/10.1007/s12200-012-0272-z

RESEARCH ARTICLE

Second-order optical differentiator using mechanically-induced LPFG with a single π-shift

Cong YIN, Xiaojun ZHOU(

), Zhiyao ZHANG, Shenghui SHI, Sixian JIANG, Liu LIU, Tingpeng LUO, Yong LIU

State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Opto-electronic Information, University of Electronic Science and Technology of China, Chengdu 610054, China

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Abstract

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 (κ) can be adjusted by changing the pressure applied on the fiber. The experimental results show that the transfer function of the proposed MI-LPFG can be adjusted to have a transfer function as an ideal second-order differentiator. The differential performance of the designed differentiator to a Gaussian pulse is also analyzed.

Keywords optical differentiator long-period fiber-grating (LPFG) optical signal processing

Corresponding Author(s): ZHOU Xiaojun,Email:xjzhou@uestc.edu.cn

Issue Date: 05 September 2012

Cite this article:

Shenghui SHI,Sixian JIANG,Cong YIN, et al. Second-order optical differentiator using mechanically-induced LPFG with a single π-shift[J]. Front Optoelec, 2012, 5(3): 261-265.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-012-0272-z
https://academic.hep.com.cn/foe/EN/Y2012/V5/I3/261

Fig.1 Experimental system (P: polarizer; PC: polarization controller; OSA: optical spectrum analyzer)

Fig.2 (a) Transfer functions of a second-order differentiator. Blue-solid line is experimental result. Black-dotted line is a fitting curve of experimental data. Red-dashed line is the transfer function of an ideal second-order differentiator; (b) spectrum of input Gaussian pulse; (c) output pulse spectra; (d) output pulses in time domain

Fig.3 (a) Simulated transfer functions which can be expressed as = 0.2397( -( -Δ)), is the central frequency of input pulse, three curves are corresponding with Δ ( = 1,2,3), which is frequency differences between central frequency of input pulse and resonant frequency of the LPFG; (b) output pulse spectra; (c) output pulses in the time domain.

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