title: 1.3-μm dual-wavelength DFB laser chip with modulation bandwidth enhancement by integrated passive optical feedback.
abstract: We report a 1.3-μm dual-wavelength distributed feedback (DFB) photonic integrated chip with modulation bandwidth enhancement using integrated optical feedback section. The dual-wavelength DFB lasers were realized using the upper separate confinement heterostructure (SCH) selective area growth (SAG) approach. A modified butt-joint technique was also adopted to achieve high-quality active-passive interface and minimize unintentional intra-cavity optical feedbacks. The fabricated photonic chip exhibited stable single mode operations with a wavelength separation of 2.06 nm. The 3-dB modulation bandwidth was enhanced through the photon-photon resonance effect with f3dB> 17 GHz and open eyes up to 25 Gbit/s for both channels were also obtained. The design can also be scaled up to higher channel counts and higher data rate.
authors.forename: Fei
authors.initials: F
authors.lastname: Guo
authors.forename: Dan
authors.initials: D
authors.lastname: Lu
authors.forename: Lu
authors.initials: L
authors.lastname: Guo
authors.forename: Songtao
authors.initials: S
authors.lastname: Liu
authors.forename: Wu
authors.initials: W
authors.lastname: Zhao
authors.forename: Hao
authors.initials: H
authors.lastname: Wang
authors.forename: Ruikang
authors.initials: R
authors.lastname: Zhang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Kan
authors.forename: Chen
authors.initials: C
authors.lastname: Ji