Open AccessIntegration of GaN/AlN all-optical switch with SiN/AlN waveguide utilizing spot-size conversion
Author(s) -
Norio Iizuka,
Haruhiko Yoshida,
Nobuto Managaki,
Toshimasa Shimizu,
Hassanet Sodabanlu,
Chiyasit Cumtornkittikul,
Masakazu Sugiyama,
Yoshiaki Nakano
Publication year - 2009
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.17.023247
Subject(s) - materials science , converters , optoelectronics , coupling loss , waveguide , insertion loss , optics , optical switch , optical fiber , coupling (piping) , power (physics) , physics , quantum mechanics , metallurgy
Spot-size converters for an all-optical switch utilizing the intersubband transition in GaN/AlN multiple quantum wells are studied with the purpose of reducing operation power by improving the coupling efficiency between the input fiber and the switch. With a stair-like spot-size converter, the absorption saturation of 5 dB is achieved with a pulse energy of 25 pJ. The switch is integrated with a SiN/AlN waveguide and spot-size converters, and the structure provides the possibility of an integration of the switch with other functional devices. To further improve the coupling loss between the waveguide and the switch, triangular-shaped converters are investigated, demonstrating losses as low as 2 dB/facet.