Open AccessCompact slanted grating couplers
Author(s) -
Bin Wang,
JianHua Jiang,
Gregory P. Nordin
Publication year - 2004
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.12.003313
Subject(s) - optics , grating , coupled mode theory , fiber bragg grating , planar , phase matching , diffraction grating , blazed grating , coupling (piping) , refractive index , physics , phase (matter) , materials science , optical fiber , computer science , laser , computer graphics (images) , quantum mechanics , metallurgy
We present a compact and efficient design for slanted grating couplers (SLGC's) to vertically connect fibers and planar waveguides without intermediate optics. The proposed SLGC employs a strong index modulated slanted grating. With the help of a genetic algorithm-based rigorous design tool, a 20microm-long SLGC with 80.1% input coupling efficiency has been optimized. A rigorous mode analysis reveals that the phase-matching condition and Bragg condition are satisfied simultaneously with respect to the fundamental leaky mode supported by the optimized SLGC.