FEASIBILITY OF 1.55 MU-M INTERSUBBAND PHOTONIC DEVICES USING INGAAS ALAS PSEUDOMORPHIC QUANTUM-WELL STRUCTURES/

We propose to use 1.55 mu m intersubband transitions as a key mechanis m for novel photonic devices such as fast photonic switches which are applicable to current optical communication systems. The calculation o f carrier relaxation times shows a few picosecond switching time for 1 .55 mu m intersubband transitions. The well-width dependence of inters ubband transition energies in InGaAs/AlAs pseudomorphic quantum well s tructures has been studied to realize 1.55 mu m intersubband transitio ns.