Fabrication of wavelength-tunable and small-signal modulated VCSEL emitting at the 850 nm regime
We report on the fabrication of an oxide-confined 850 nm VCSEL capable of wavelength tuning and small-signal modulation. The wavelength tuning is enabled by actuating a suspended high-contrast grating (HCG) with micro-electro-mechanical structures (MEMS). A resonant frequency up to 6.3 GHz was obtained by small-signal modulation on the fabricated VCSEL with all-top metal contact. The integration of wavelength tuning and high direct-modulation speed in a single VCSEL is deemed promising for high speed data communication applications.