Melati Daniele, Morichetti Francesco, Gentili Gian Guido, Melloni Andrea
Opt Lett. 2014 Jul 1;39(13):3982-5. doi: 10.1364/OL.39.003982.
We report on the comprehensive experimental characterization of optical crosstalk between waveguides caused by scattering. Our results reveal that a strong power exchange between close-placed waveguides due to sidewall roughness exists also for high-quality, low-loss waveguides. We derive a power-law dependence of the coupling on the distance between the waveguides, confirmed by an ad hoc developed electromagnetic model. Further, we demonstrate higher order mode excitation caused by scattered light and the appearance of decorrelation between the guided modes propagating in waveguides coupled via radiative mechanism, providing a full description of this phenomenon.
我们报告了由散射引起的波导间光学串扰的全面实验表征。我们的结果表明，对于高质量、低损耗的波导，由于侧壁粗糙度，紧密放置的波导之间也存在强烈的功率交换。我们推导了耦合与波导间距离的幂律关系，这一关系由专门开发的电磁模型得到证实。此外，我们证明了散射光会引起高阶模激发，以及在通过辐射机制耦合的波导中传播的导模之间出现去相关现象，从而对这一现象进行了全面描述。
