title: Ultra-high-extinction-ratio 2 × 2 silicon optical switch with variable splitter.
abstract: We demonstrate a record-high extinction-ratio of 50.4 dB in a 2 × 2 silicon Mach-Zehnder switch equipped with a variable splitter as the front 3-dB splitter. The variable splitter is adjusted to compensate for the splitting-ratio mismatch between the front and rear 3-dB splitters. The high extinction ratio does not rely on waveguide crossings and meets a strong demand in applications to multiport circuit switches. Large fabrication tolerance will make the high extinction ratio compatible with a volume production with standard complementary metal-oxide semiconductor fabrication facilities.
authors.forename: Keijiro
authors.initials: K
authors.lastname: Suzuki
authors.forename: Guangwei
authors.initials: G
authors.lastname: Cong
authors.forename: Ken
authors.initials: K
authors.lastname: Tanizawa
authors.forename: Sang-Hun
authors.initials: SH
authors.lastname: Kim
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Ikeda
authors.forename: Shu
authors.initials: S
authors.lastname: Namiki
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Kawashima