马赫曾德环腔相位调制器的研究

为提高相位调制器的调制效率,结合单直波导光学环腔与带反馈的马赫曾德,提出用环形谐振腔等效为马赫曾德的上、下臂的新结构.采用耦合模理论推导了该模型的输出相位及归一化光强输出公式,数值分析了传输损耗因子、耦合角度对归一化输出光强及输出相位的影响.分析表明,输出光相位谱线随敏感环相位改变呈周期性变化,当耦合角度逐渐增大时,输出光相位谱线变尖锐,此时若要使输出相位产生π的相位差,敏感环的相位调制角度需较大.当传输因子较小时,相位谱线变化比较平缓,其最大值与最小值之间的差值不满足π的相位差.根据分析结果对结构参量进行优化,发现通过调节敏感环结构的耦合系数可以提高调制效率,仿真结果表明,当敏感环相位变化0.1π时,可以输出π的相位变化,同时归一化光强保持在0.9,满足了差分相移键控所需要的相位变化和信号幅度一致的要求,为进一步研究相位调制器提供理论依据.

Abstract

To improve the efficiency of phase modulator,the ring resonator which is equivalent to Maher-Zehnd′s upper and lower arm was proposed by combining the advantages of the optical microring and Mach-Zehnder.The normalized output intensity and output phase were derived by coupled-mode theory.The effects of the transmission loss factor and the coupling angle on the normalized optical intensity and phase were numerically analyzed.The analysis results show that the output light spectrum cyclical changes as phase-sensitive ring phase changes.When the coupling angle increases,the output light spectrum becomes more acute,the output of π need the greater phase modulation.When the transmission factor is small,the phase change is relatively flat spectrum,the difference between maximum and minimum values is not met π.By optimizing structure parameters of Mach-Zehnder microring resonator,sensitive ring structure can improve the modulation efficiency.Simulation results show that when the phase shift of the sensitive ring is 0.1π,the output phase shift can be achieved π,and the normalized intensity can be kept 0.9 at the same time.The consistent requirements of phase shift and signal amplitude in differential phase shift keying is implemented,which providing a theoretical basis for further study of phase modulator.

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陈曜, 何鹏程, 卜天容, 丁玉丽. 马赫曾德环腔相位调制器的研究[J]. 光子学报, 2015, 44(8): 0823003. CHEN Yao, HE Peng-cheng, BU Tian-rong, DING Yu-li. Study on Mach-Zehnder Microring Resonator Phase Modulator[J]. ACTA PHOTONICA SINICA, 2015, 44(8): 0823003.

马赫曾德环腔相位调制器的研究

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