Journal of Jianghan University (Natural Science Edition) ›› 2020, Vol. 48 ›› Issue (2): 21-27.doi: 10.16389/j.cnki.cn42-1737/n.2020.02.004

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An Improved Optical Filter Based on Micro-Ring Resonator Coupling with Mach-Zehnder Interferometer

GONG Yuanye1，DONG Shanshan2，NIU Changliu*3，DING Zhi1，SHEN Zhixing1   

  1. 1. School of Computer Engineering，Bengbu University，Bengbu 233000，Anhui，China；2. College of Information and Network Engineering，Anhui Science and Technology University，Fengyang 233100，Anhui，China；3. College of Electronic and Information Engineering，North China University of Technology，Beijing 100144，China
  • Published:2020-04-22
  • Contact: NIU Changliu

Abstract: To optimize and improve the transmission performance of conventional Mach-Zehnder interferometer（MZI）filter，a novel filter structure was proposed and discussed in this work based on micro-ring coupling with through-arm of conventional Mach-Zehnder interferometer. Using the theory of micro-ring resonance and signal flow chart，the transfer function of the filter was derived and the output spectrum expression was described as well. The results of numerical simulation indicated that through the phase modification provided by ring resonator and optimization of the coupling coefficient，it obtained a uniform flat-top and similar-to-square output spectrum. Compared with the conventional filter of MZI， the filtering performance of the novel filter is improved significantly.

Key words: integrated optics, micro-ring resonator, Mach-Zehnder interferometer, theory of signal flow graph

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