Open AccessHighly efficient and perfectly vertical chip-to-fiber dual-layer grating coupler
Author(s) -
Ming Dai,
Leilei Ma,
Yiwei Xu,
Minghui Lu,
Xiaoping Li,
Yanfeng Chen
Publication year - 2015
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.23.001691
Subject(s) - optics , materials science , grating , coupling (piping) , optoelectronics , chip , fiber , photonic crystal fiber , wavelength , telecommunications , physics , computer science , metallurgy , composite material
A novel high-efficiency silicon-chip-to-fiber grating coupler is investigated here. By introducing a dual layer grating structure with an inter-layer lateral shift to mimic 45° tilted mirror behavior, perfectly vertical coupling is successfully demonstrated. Our numerical results show that a peak silicon-chip-to-fiber coupling efficiency about 70% is possible near 1550 nm. Meanwhile, for the entire telecom C-band, i.e. wavelengths from 1530 nm to 1565 nm, the coupling efficiency is > 50% and the back reflection is less than < 1%. Our proposed high-performance silicon perfectly vertical coupling structure is suitable for interfacing with multi-core fiber platform, which may play an important role in the future CMOS photonic integration technology.