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Free space laser communication becomes one of the most attractive research pot of next generation optical communication technologies due to its advantages of large data transmission amount, high directionality of transmission and high transmission security. The tapered semiconductor lasers are one of the most important optical sources in such systems. In this paper, we introduce the structure design,...
A new device structure is reported to improve performance of vertical cavity surface-emitting lasers (VCSELs). Namely many cylindrical holes (CH) or noncontiguous ring trench (NRT) are etched instead of the conventional ring trench (RT). The mesa with such new structure offers radial bridges for current injection, the connecting Ti-Au metal between ohmic contact and bonding pad does not have to cross...
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