Open AccessLong-wave infrared 1 × 2 MMI based on air-gap beneath silicon rib waveguides
Author(s) -
Yuxin Wei,
Guoyi Li,
Yue Hao,
Yubo Li,
Jianyi Yang,
Minghua Wang,
Xiaoqing Jiang
Publication year - 2011
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.19.015803
Subject(s) - undercut , materials science , optics , silicon on insulator , air gap (plumbing) , wafer , splitter , infrared , waveguide , wavelength , optoelectronics , interference (communication) , silicon , telecommunications , physics , channel (broadcasting) , computer science , composite material
The undercut long-wave infrared (LWIR) waveguide components with air-gap beneath are analyzed and fabricated on the Si-wafer with simple manufacturing process. A 1 × 2 multimode interference (MMI) splitter based on this structure is presented and measured under the 10.6 μm wavelength experimental setup. The uniformity of the MMI fabricated is 0.76 dB. The relationship among the output power, slab thickness and air-gap width is also fully discussed. Furthermore, undercut straight waveguides based on SOI platform are fabricated for propagation loss evaluation. Ways to reduce the loss are discussed either.