Aschieri Pierre, de Micheli Marc P
University of Nice Sophia-Antipolis, LPMC UMR 6622, Parc Valorse, Nice Cedex 2, France.
Appl Opt. 2011 Jul 20;50(21):3885-8. doi: 10.1364/AO.50.003885.
The purpose of this article is to show that efficient light coupling in lithium niobate waveguides presenting a strongly confined mode, such as photonic wires, is possible with the use of a periodically segmented waveguide coupler. The coupler consists in an input periodically segmented waveguide whose mode size is adapted to the mode of a standard single-mode fiber coupled to a photonic wire whose mode size is of the same order of the wavelength. The periodic segmentation of the input waveguide allows fulfilling the phase matching condition necessary to achieve an efficient light transfer between these waveguides. The coupling efficiency is typically 5 times higher than the butt-coupled configuration.
本文的目的是表明，对于诸如光子线之类呈现强限制模式的铌酸锂波导，使用周期性分段波导耦合器可以实现高效的光耦合。该耦合器由一个输入周期性分段波导组成，其模式尺寸与耦合到光子线的标准单模光纤的模式相匹配，该光子线的模式尺寸与波长处于同一量级。输入波导的周期性分段使得能够满足在这些波导之间实现高效光传输所需的相位匹配条件。耦合效率通常比对接耦合配置高5倍。
