Long-Wavelength VCSEL Using High-Contrast Grating

摘要

Recent advances in high-contrast grating (HCG) vertical-cavity surface-emitting lasers (VCSEL) emitting at 1550?nm is reported in this paper. The novel near-wavelength HCG has an ultrathin structure and broadband reflectivity. It enables a monolithic, simple fabrication process for realizing InP-based VCSELs emitting at ～1550?nm. We report 2.4-mW single-mode output under continuous-wave operation at 15?°C. We show that, despite broadened by the Brownian motion, the HCG-VCSEL has a total linewidth of 60?MHz or a coherent length of 5?m in air, and an intrinsic linewidth <20?MHz. Transmission of directly modulated 10 Gbps over 100-km dispersion-compensated single-mode fiber is demonstrated. Tunable HCG-VCSEL is demonstrated with the HCG integrated with a micro-electro-mechanical structure. Continuous wavelength tuning as wide as 26.3?nm is achieved. The tunable VCSEL was used as a source for external modulation for 40-Gbps differential-phase-shift-keyed signal and transmitted over 100-km dispersion-compensated link with negligible power penalty.