Qi-liang Li,Zi-yang Wang,Yong Zhang,Tian-shu Wang,Ran Zeng,Miao Hu.Tunable time delay in active fiber Bragg grating coupler[J].Optoelectronics Letters,2012,8(6):433-436 Tunable time delay in active fiber Bragg grating coupler Author Name Affiliation E-mail Qi-liang Li  Institute of Communication and Information, College of Communication Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China  liqiliang2@yahoo.com.cn  Zi-yang Wang  Institute of Communication and Information, College of Communication Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China    Yong Zhang  Institute of Communication and Information, College of Communication Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China    Tian-shu Wang  Institute of Communication and Information, College of Communication Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China    Ran Zeng  Institute of Communication and Information, College of Communication Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China    Miao Hu  Institute of Communication and Information, College of Communication Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China    Abstract:       Slowing down velocity and controlling time delay of optical pulses in fiber have many potential applications in optical communication systems, and a number of theoretical and experimental studies have been done. In this paper, the transmission spectrum and reflective spectrum of active fiber Bragg grating (FBG) couplers are studied, and the analytic expressions of dispersion and time delay are obtained. By changing the detuning and gain coefficient, different dispersions and time delays in active fiber Bragg grating coupler are obtained. The results show that different detunings and gain coefficients can result in various time delays, and thus tunable time delay could be achieved by changing signal frequency or gain coefficient. Hits: 4077 Download times: 605 View Full Text    Download reader