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Strong polarization mode coupling in microresonators

机译:微谐振器中的强极化模式耦合

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We observe strong modal coupling between the TE_(00) and TM_(00) modes in Si_3N_4 ring resonators revealed by avoided crossings of the corresponding resonances. Such couplings result in significant shifts of the resonance frequencies over a wide range around the crossing points. This leads to an effective dispersion that is one order of magnitude larger than the intrinsic dispersion and creates broad windows of anomalous dispersion. We also observe the changes to frequency comb spectra generated in Si_3N_4 microresonators due to polarization mode and higher-order mode crossings and suggest approaches to avoid these effects. Alternatively, such polarization mode crossings can be used as a tool for dispersion engineering in microresonators.
机译:我们观察到Si_3N_4环形谐振器中TE_(00)和TM_(00)模式之间的强模态耦合通过避免交叉相应的谐振而揭示出来。这种耦合导致谐振频率在交叉点附近的较大范围内发生明显变化。这导致有效色散比固有色散大一个数量级,并产生宽广的异常色散窗口。我们还观察到由于极化模式和高阶模式交叉而在Si_3N_4微谐振器中生成的频率梳频谱的变化,并提出了避免这些影响的方法。可替代地,这种偏振模式交叉可以用作微谐振器中的色散工程的工具。

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