Extraction of Coupling Coefficients of Directional Couplers Using Resonance Splitting
Extraction of Coupling Coefficients of Directional Couplers Using Resonance Splitting
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DOI：
10.1109/jphot.2022.3221487
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发表时间：
2022-12
影响因子：
2.4
通讯作者：
Ang Li;Y. Fainman
中科院分区：
文献类型：
--
作者：
Ang Li;Y. Fainman
本文从理论和实验上提出了一种利用单路电路精确提取定向耦合器耦合系数的新方法。它利用了由环形谐振器中的模式耦合引起的谐振分裂现象，其中分裂距离与耦合两个模式的耦合器的耦合系数成正比。与以往的方法相比，它不依赖于测量的振幅参数提取，因此，该方法是不敏感的其他组件的电路中的光纤/芯片耦合器，波导和谐振器的损失，以及计量误差的不确定性。更重要的是，它可以在非常弱的耦合系数下工作，低至10−4。
We theoretically and experimentally present a novel method to accurately extract coupling coefficients of directional couplers using a single circuit. It utilizes the phenomenon of resonance splitting induced by mode coupling in a ring resonator, where the splitting distance is directly proportional to the coupling coefficient of the coupler that couples two modes. Compared with previous approaches, it doesn't rely upon measured amplitudes for parameter extraction, therefore, this method is insensitive to the uncertainties in the losses of other components in the circuit such as fiber/chip couplers, waveguides and resonators, as well as gage errors. More importantly, it can work with very weak coupling coefficients, down to 10−4.