ANALYSIS OF LARGE GROUP VELOCITY DISPERSION BY MODAL INTERACTION IN PHOTONIC CRYSTAL WAVEGUIDES
There are two kinds of modes(gap guided-mode and index guided-mode) with respective light-guiding principle in photonic crysatl waveguides. The two modes differ greatly in group velocities. Based on this property, the two modes may interact with each other under mode anti-crossing phenomena, then the sharp dispersion of supermodes is investigated. The dispersion is controlled entirely by geometric parameters and not by material dispersion, it is tunable by structural choices. According to this theory, the waveguide supermodes and dispersion coefficients of a photonic crystal waveguide are calculated in this paper. Positive and negative dispersion of approximately dozens of ps/nm on centimeter scale over the bandwidth of a single WDM channel (0.8nm). We draw the plots of dispersion curves in certain frequency domain. It shows that through designing the structure parameters as air hole diameter d , unit cell size a and relative hole size f ,we can engineer the chromatic dispersion of waveguide.
photonic crystal gap guided-mode,index guided-mode anti-crossing
Hao Zhang Xiaoxia Zhang Yuxi Liu Ying Li Qingli Yang Xiaofeng Zhao
School of Opto-Electronic Information, University of Electronic Science and Technology of China , Chengdu 610054 ,China, P. R.
国际会议
成都
英文
176-179
2006-09-18（万方平台首次上网日期，不代表论文的发表时间）