Abstract

In this paper, an optimal design of a small polymeric ridge waveguide with a high index contrast is presented. In order to reduce the leakage to the substrate and pure bending losses, the buffer layer of the present waveguide is etched partially. The single-mode condition, the bending characteristics, and the birefringence of the present small polymeric ridge waveguide are also studied. By adjusting the core width and the core height, it is possible to obtain a polarization-insensitive small polymer ridge waveguide. For the bending loss, the numerical results show that the dominant part is the transition loss between the straight and bending sections (other than the pure bending loss) and the transition loss could be reduced greatly by introducing a lateral offset. However, the transition loss is still too large to obtain a very small bending radius (e.g., 10 <i>µ</i>m). When only the pure bending loss is necessary to consider in some special case (e.g., microrings without any transitions), one can have a bending radius less than 10 <i>µ</i>m due to the possibility of low pure bending loss.

© 2008 IEEE

High-index-contrast waveguides and devices

Mee-Koy Chin, Chee-Wei Lee, Shuh-Ying Lee, and Stevanus Darmawan
Appl. Opt. 44(15) 3077-3086 (2005)

Numerical analysis of silicon-on-insulator ridge nanowires by using a full-vectorial finite-difference method mode solver

Daoxin Dai and Zhen Sheng
J. Opt. Soc. Am. B 24(11) 2853-2859 (2007)

Characteristic analysis of nanosilicon rectangular waveguides for planar light-wave circuits of high integration

Daoxin Dai, Yaocheng Shi, and Sailing He
Appl. Opt. 45(20) 4941-4946 (2006)

Fabrication and characterization of suspended SiO₂ ridge optical waveguides and the devices

Pengxin Chen, Yunpeng Zhu, Yaocheng Shi, Daoxin Dai, and Sailing He
Opt. Express 20(20) 22531-22536 (2012)

High performance on-chip polarization beam splitter at visible wavelengths based on a silicon nitride small-sized ridge waveguide

Xinzhi Zheng, Chenxi Zhao, Yujie Ma, Shijun Qiao, Shuai Chen, Zhaojie Zhang, Mingyang Yu, Bingxi Xiang, Jinman Lv, Fei Lu, Cangtao Zhou, and Shuangchen Ruan
Opt. Express 31(23) 38419-38429 (2023)