Liu Yan, Yan Jing, Han Genquan
Appl Opt. 2014 Sep 20;53(27):6302-6. doi: 10.1364/AO.53.006302.
In this paper, we propose a new dual slot based on rib-like structure, which exhibits a flat and near-zero dispersion over a 198 nm wide wavelength range. Chromatic dispersion of dual-slot silicon (Si) waveguide is mainly determined by waveguide dispersion due to the manipulating mode effective area rather than by the material dispersion. Moreover, the nonlinear coefficient and effective mode area of the waveguide are also explored in detail. A nonlinear coefficient of 1460/m/W at 1550 nm is achieved, which is 10 times larger than that of the Si rib waveguide. By changing different waveguide variables, both the dispersion and nonlinear coefficient can be tailored, thus enabling the potential for a highly nonlinear waveguide with uniform dispersion over a wide wavelength range, which could benefit the performance of broadband optical signal systems.
在本文中，我们提出了一种基于肋状结构的新型双槽结构，其在198纳米宽的波长范围内呈现出平坦且接近零的色散。双槽硅（Si）波导的色散主要由由于操纵模式有效面积引起的波导色散决定，而非材料色散。此外，还详细研究了该波导的非线性系数和有效模式面积。在1550纳米处实现了1460/米/瓦的非线性系数，这比硅肋波导的非线性系数大10倍。通过改变不同的波导变量，可以调整色散和非线性系数，从而实现具有宽波长范围内均匀色散的高非线性波导的潜力，这将有利于宽带光信号系统的性能。
