title: Design and simulation of two-section DFB lasers with short active-section lengths.
abstract: Distributed feedback lasers comprised of a reflection section and an active section have been proposed for high direct-modulation bandwidth. The reflection section has the same core layer as the active section so butt-joint re-growth is avoided. Without current injection the reflection section will be pumped to near transparency by the emission from the laser itself so high reflection (> 0.75) can still be achieved as confirmed by the simulation. Therefore a short (150 µm) active section can be used, which enables a low threshold current (~5 mA) and a high direct modulation bandwidth (>30 GHz) as demonstrated by the simulation.
authors.forename: Gongyuan
authors.initials: G
authors.lastname: Zhao
authors.forename: Junqiang
authors.initials: J
authors.lastname: Sun
authors.forename: Yanping
authors.initials: Y
authors.lastname: Xi
authors.forename: Dingshan
authors.initials: D
authors.lastname: Gao
authors.forename: Qiaoyin
authors.initials: Q
authors.lastname: Lu
authors.forename: Weihua
authors.initials: W
authors.lastname: Guo