Propagation losses in micro-ring resonator waveguides can be determined from the shape of individual resonances in their transmission spectrum. The losses are typically extracted by fitting these resonances to an idealized model that is derived using scattering theory. Reflections caused by waveguide boundaries or stitching errors, however, cause the resonances to become asymmetric, resulting in poor fits and unreliable propagation loss coefficients. We derive a model that takes reflections into account and, by performing full-wave simulations, we show that this model accurately describes the asymmetric resonances that result from purely linear effects, yielding accurate propagation loss coefficients.
翻译:微环共振波导的促动损失可以从其传输频谱中的单个共振形状中确定。这些损失通常通过将这些共振与利用散射理论得出的理想化模型相匹配而得出。但是,波导边界或缝合错误引起的反射使共振变得不对称,导致传播损失系数差和不可靠。我们得出一个模型,将反射考虑在内,并通过进行全波模拟,我们表明,这一模型准确地描述了纯粹线性效应产生的不对称共振,产生了准确的传播损失系数。