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题名: Prediction and suppression of strong dispersive coupling in microracetrack channel drop filters
作者: Chen Q (Chen Qin);  Yang YD (Yang Yue-De);  Huang YZ (Huang Yong-Zhen)
发表日期: 2007
摘要: For a four-port microracetrack channel drop filter, unexpected transmission characteristics due to strong dispersive coupling are demonstrated by the light tunneling between the input-output waveguides and the resonator, where a large dropping transmission at off-resonance wavelengths is observed by finite-difference time-domain simulation. It causes a severe decline of the extinction ratio and finesse. An appropriate decrease of the coupling strength is found to suppress the dispersive coupling and greately increase the extinction ratio and finesse, a decreased coupling strength can be realized by the application of an asymmetrical coupling waveguide structure. In addition, the profile of the coupling dispersion in the transmission spectra can be predicted based on a coupled mode theory analysis of an equivalent system consisting of two coupling straight waveguides. The effects of structure parameters on the transmission spectra obtained by this method agree well with the numerical results. It is useful to avoid the strong dispersive coupling region in the filter design. (c) 2007 Optical Society of America.
刊名: OPTICS LETTERS
专题: 中国科学院半导体研究所(2009年前)_期刊论文

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推荐引用方式:
Chen, Q (Chen, Qin); Yang, YD (Yang, Yue-De); Huang, YZ (Huang, Yong-Zhen) .Prediction and suppression of strong dispersive coupling in microracetrack channel drop filters ,OPTICS LETTERS,JUL 1 2007,32 (13):1851-1853
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