High speed evanescently coupled PIN photodiodes for hybridisation on silicon platform optimised with genetic algorithm

Evanescently coupled photodiodes have been designed for hybridisation on an Si platform. Diluted multimode waveguides have been optimised with a genetic algorithm. High efficiency photodiodes at both 1.3 and 1.5 /spl mu/m, with very low polarisation dependence, have been fabricated with low bias, 2.5 Gbit/s capability and high reliability.