Shiran Hatef, Zhang Guowu, Liboiron-Ladouceur Odile
Opt Express. 2021 Jul 19;29(15):23864-23876. doi: 10.1364/OE.423882.
The multimode power splitter is a fundamental component in mode-division multiplexed systems. In this paper, we design and characterize a broadband compact dual-mode multimode interferometer (MMI) optical power splitter based on subwavelength grating (SWG) structures. The optimized dual-mode MMI is three times more compact than its conventional mode insensitive MMIs and shows low loss and low crosstalk flat response over 100 nm bandwidth. Characterizations of the fabricated dual-mode splitter show that the total excess loss in the experiment is less than 0.1 dB and 0.65 dB for TE0 and TE1, respectively, and the modal crosstalk is less than -17 dB for both input modes.
多模功率分配器是模分复用系统中的一个基本组件。在本文中，我们设计并表征了一种基于亚波长光栅（SWG）结构的宽带紧凑型双模多模干涉仪（MMI）光功率分配器。优化后的双模MMI比传统的模式不敏感MMI紧凑三倍，并且在100纳米带宽上呈现出低损耗和低串扰的平坦响应。对制造的双模分配器的表征表明，在实验中，TE0和TE1的总额外损耗分别小于0.1分贝和0.65分贝，并且两种输入模式的模式串扰均小于-17分贝。
