Open AccessEnhanced Coupling Strength Gratings for Couplers in III–V Compound Dielectric Waveguides
Author(s) -
Gary A. Evans,
Jerome K. Butler,
Ruo-Hua He,
Jay B. Kirk,
Jin Yao,
Xuezhe Zheng,
Ashok V. Krishnamoorthy
Publication year - 2017
Publication title -
journal of lightwave technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.346
H-Index - 200
eISSN - 1558-2213
pISSN - 0733-8724
DOI - 10.1109/jlt.2017.2651680
Subject(s) - communication, networking and broadcast technologies , photonics and electrooptics
The use of a thin, low-index liner layer over a surface grating covered by a high-index cover layer in a III-V alloy waveguide significantly improves the coupling efficiency of grating couplers, and therefore, reduces the length of such couplers by an order of magnitude. The same low-index liner and high-index cover layer can also reduce losses between transition sections of photonic integrated circuits or between a laser region and a distributed Bragg reflector or grating coupler region.