Research on FBG-based longitudinal-acousto-optic modulator with Fourier mode coupling method

被引：12

作者：

Li, Zhuoxuan ^{[1
]}

Pei, Li ^{[1
]}

Liu, Chao ^{[1
]}

Ning, Tigang ^{[1
]}

Yu, Shaowei ^{[1
]}

机构：

[1] Beijing Jiaotong Univ, Key Lab All Opt Network & Adv Telecommun Network, Minist Educ China, Inst Lightwave Technol, Beijing 100044, Peoples R China

来源：

APPLIED OPTICS | 2012年 / 51卷 / 30期

基金：

中国国家自然科学基金;

关键词：

BRAGG; WAVELENGTH;

D O I：

10.1364/AO.51.007314

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Fourier mode coupling model was first applied to achieve the spectra property of a fiber Bragg grating (FBG)-based longitudinal-acousto-optic modulator. Compared with traditional analysis algorithms, such as the transfer matrix method, the Fourier mode coupling model could improve the computing efficiency up to 100 times with a guarantee of accuracy. In this paper, based on the theoretical analysis of this model, the spectra characteristics of the modulator in different frequencies and acoustically induced strains were numerically simulated. In the experiment, a uniform FBG was modulated by acoustic wave (AW) at 12 different frequencies. In particular, the modulator responses at 563 and 885.5 KHz with three different lead zirconate titanate (PZT) loads applied were plotted for illustration, and the linear fitting of experimental data demonstrated a good match with the simulation result. The acoustic excitation of the longitudinal wave is obtained using a conic silica horn attached to the surface of a shear-mode PZT plate paralleled to the fiber axis. This way of generating longitudinal AW with a transversal PZT may shed light on the optimal structural design for the FBG-based longitudinal-acousto-optic modulator. (C) 2012 Optical Society of America

引用

页码：7314 / 7318

页数：5