Low-loss high-index-contrast planar waveguides with graded-index cladding layers

被引：28
|
作者：
Hu, Juejun
Feng, Ning-Ning [1 ]
Carlie, Nathan
Petit, Laeticia
Wang, Jianfei
Agarwal, Anu
Richardson, Kathleen
Kimerling, Lionel
机构：
[1] MIT, Microphoton Ctr, Cambridge, MA 02139 USA
[2] Clemson Univ, Adv Mat Res Lab, Anderson, SC 29625 USA
来源：
OPTICS EXPRESS | 2007年 / 15卷 / 22期
关键词：
D O I：
10.1364/OE.15.014566
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We experimentally demonstrate, for the first time, propagation loss reduction via graded-index (GRIN) cladding layers in high-index-contrast (HIC) glass waveguides. We show that scattering loss arising from sidewall roughness can be significantly reduced without compromising the high-index-contrast condition, by inserting thin GRIN cladding layers with refractive indices intermediate between the core and topmost cover of a strip waveguide. Loss as low as 1.5 dB/cm is achieved in small core (1.6 mu m x 0.35 mu m), high-index-contrast (Delta n = 1.37) arsenic-based sulfide strip waveguides. This GRIN cladding design is generally applicable to HIC waveguide systems such as Si/SiO(2). (C) 2007 Optical Society of America.
引用
收藏
页码：14566 / 14572
页数：7
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