Patent ID: 7030415

Claim:
A semiconductor quantum dot optical amplifier for amplifying an optical signal, comprising: a semiconductor substrate made of GaAs; a first conductive type clad layer formed on the semiconductor substrate and allowing conductive particles required to amplify the optical signal to pass; a quantum dot active layer formed close to an upper surface of the first conductive type clad layer and including layers of quantum dots amplifying the optical signal; and a second conductive type clad layer formed close to an upper surface of the quantum dot active layer and operating to correspond to the first conductive type clad layer to allow the conductive particles required for an amplification to pass; wherein the active layer is formed by repeatedly performing an In(x)Ga(1-x)As epitaxial process using InGaAs, an In(y)Ga(1-y)As quantum dot using InGaAs, and an In(z)Ga(1-z)As epitaxial process using InGaAs, where x and z values range from 0 to 0.5, and a y value ranges from about 0.4 to 1.