Khilo Anatol, Popović Milos A, Araghchini Mohammad, Kärtner Franz X
Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
Opt Express. 2010 Jul 19;18(15):15790-806. doi: 10.1364/OE.18.015790.
A new, efficient adiabatic in-plane fiber-to-chip coupler design is proposed. In this design, the light from the fiber is coupled into a low-index waveguide with matching mode size. The mode is first adiabatically reduced in size with a rib taper, and then transferred into a high-index (e.g. silicon) waveguide with an inverse taper. The two-stage design allows to reduce the coupler length multiple times in comparison with pure inverse taper-based couplers of similar efficiency. The magnitude of length reduction increases with the refractive index of the low-index waveguide and the fiber mode size.
提出了一种新型高效的绝热平面光纤到芯片耦合器设计。在这种设计中，来自光纤的光被耦合到具有匹配模式尺寸的低折射率波导中。该模式首先通过肋形渐变绝热地减小尺寸，然后通过反向渐变转移到高折射率（如硅）波导中。与具有相似效率的纯反向渐变型耦合器相比，这种两级设计允许多次减小耦合器长度。长度减小的幅度随着低折射率波导的折射率和光纤模式尺寸的增加而增加。
