Pouyan Sohrab Mohammadi, Miri Mehdi, Sheikhi Mohammad Hossein
Appl Opt. 2021 Feb 10;60(5):1083-1091. doi: 10.1364/AO.415019.
Design and numerical characterization of a high-performance -based optical modulator are proposed. The modulation is achieved by the phase transition of in a Bragg grating which can be formed by the selective deposition on a silicon strip waveguide. The interplay of the Bragg reflection and the inherent loss of the metal phase is used to increase the extinction ratio (ER) while the similarity of the refractive indices of the silicon and insulator phase resulted in a low insertion loss (IL). ER and IL of the modulator are 34.5 dB and 3.4 dB, respectively, at the wavelength of 1.55 µm, and they are, respectively, above 33 dB and below 3.5 dB across the entire optical C-band. The ER can be improved to 110 dB at the expense of an increased IL of 7.3 dB. The energy consumption and the modulation speed are estimated by considering different triggering schemes, and it is shown that the energy consumption of 91.7fJ/bit and the speed of 14 THz can be achieved with the proper stimulation. Furthermore, the robustness of the device performance to fabrication errors is studied by simulating the effect of the variation in different geometrical parameters.
提出了一种基于高性能的光调制器的设计及数值表征。调制是通过在布拉格光栅中[物质名称]的相变来实现的，该布拉格光栅可通过在硅条形波导上选择性地[沉积方式]沉积形成。利用布拉格反射与金属相[物质名称]固有损耗之间的相互作用来提高消光比（ER），而硅和绝缘相[物质名称]的折射率相似性导致了低插入损耗（IL）。在1.55 µm波长处，调制器的ER和IL分别为34.5 dB和3.4 dB，并且在整个光C波段内，它们分别高于33 dB和低于3.5 dB。以增加7.3 dB的IL为代价，ER可提高到110 dB。通过考虑不同的[触发物质名称]触发方案来估计能量消耗和调制速度，结果表明，通过适当的[刺激方式]刺激，可以实现91.7 fJ/bit的能量消耗和14 THz的速度。此外，通过模拟不同几何参数变化的影响，研究了器件性能对制造误差的鲁棒性。
