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Summary form only given. We are reaching one of the most important aspects of the tera era is the need for high-speed interconnections between computers and peripherals. The use of optical interconnects using low-cost optoelectronic components will be key to the development of computer networks of the future. A very important technology which will enable high-speed optical interconnects is the vertical cavity surface emitting laser (VCSEL) technology. These lasers can be made and tested in a fashion similar to light emitting diodes, allowing low-cost manufacturing, and can be made into two-dimensional arrays, allowing unique signal processing capabilities. Many R&D groups are busy developing VCSEL technology. The state-of-the-art of VCSEL technology has reached a very impressive level with threshold currents of the order of 100 μA and internal efficiencies greater than 50%. VCSELs have been developed over a wide wavelength range from 650nm to 1550 nm using conventional epitaxial growth techniques or more sophisticated techniques such as wafer fusing and bonding.