Our high-speed 850 nm multimode VCSEL chip is designed to meet stringent specifications for high speed data communications. This high-performance, high-reliability device is engineered with low electrical parasitics for data rates of up to 10 Gbps. The VCSEL operates in multiple transverse and single longitudinal modes, and emits a circular symmetric beam with low divergence that can be efficiently coupled into 50/125 µm and 62.5/125 µm multimode fibers.