Open AccessWide bandwidth and high coupling efficiency Si_3N_4-on-SOI dual-level grating coupler
Author(s) -
Wesley D. Sacher,
Ying Huang,
Ding Liang,
B. J. Taylor,
Hasitha Jayatilleka,
GuoQiang Lo,
Joyce K. S. Poon
Publication year - 2014
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.22.010938
Subject(s) - silicon on insulator , grating , optics , materials science , silicon nitride , resonator , optoelectronics , bandwidth (computing) , multiplexer , silicon photonics , silicon , demultiplexer , diffraction grating , multiplexing , physics , telecommunications , computer science
We propose and experimentally demonstrate fiber-to-chip grating couplers with aligned silicon nitride (Si(3)N(4)) and silicon (Si) grating teeth for wide bandwidths and high coupling efficiencies without the use of bottom reflectors. The measured 1-dB bandwidth is a record 80 nm, and the measured peak coupling efficiency is -1.3 dB, which is competitive with the best Si-only grating couplers. The grating couplers are integrated in a Si(3)N(4) on silicon-on-insulator (SOI) integrated optics platform with aligned waveguides in both the Si(3)N(4) and Si, and we demonstrate a 1 × 4 tunable multiplexer/demultiplexer using the Si(3)N(4)-on-SOI dual-level grating couplers and thermally-tuned Si microring resonators.