A research on the characteristics of an interlleaver with a symmetrical resonator

• Published in: 光电子快报：英文版 no. 1; pp. 21 - 24
• Main Author: 鲁怀伟 魏赟 邬开俊 王春丽 蒋占军 罗冠炜
• Format: Journal Article
• Language: English
• Published: 2013
• Subjects: Mach-Zehnder干涉仪; 交织器; 传播损耗; 传输性能; 光纤耦合器; 数值模拟; 环形谐振器; 非对称
• ISSN: 1673-1905; 1993-5013

In order to improve the transmission performance of the conventional Mach-Zehnder interferometer （MZI）, a novel interleaver combining an ＂8＂ form ring resonator with a planar 3×3 single fiber coupler is proposed. Based on the phase modulation provided by the ring resonator, a flat filtering response is obtained by optimizing the coupling angle of resonator. The output expression is derived and numerical simulation is performed. The simulation indicates that the 0.5 dB passband and 25 dB stopband of the proposed interleaver are simultaneously improved remarkably, which are much wider than those of the single-stage MZI and the two-stage MZI interleavers, and the filtering performance of the proposed interleaver, which achieves a nearly square spectrum response, is also much better. Compared with the interleaver based on an asymmetrical MZI with a resonator in one arm, there is no difference between the intensities of two coherent beams in the condition of considering the influence of the propagation loss. Theoretical analysis shows that the influence of the propagation loss on extinction ratio can be effectively reduced.