Patent ID: 6835585
Filing Date: 2004-12-28
Classification: H01S

Abstract:
A method of fabricating an electro-absorption modulator-integrated laser (EML) for optical communication, comprising the steps of:preparing a compound semiconductor structure having a laser diode section and a modulator section growing simultaneously; forming a two step InP layer, a bottom layer consisting of a P-InP layer and a top layer consisting of an undoped InP layer, on the top surface of the compound semiconductor structure; forming an InGaAs layer which selectively covers the top surface of the undoped InP layer, forming a mask layer in strips which selectively covers the top surface of the InGaAs layer, defining a trench region between the laser diode section and the modulator section; depositing Zn or a Zn compound on the top surface of the laser diode section and the modulator section except for the trench region and diffusing the Zn; and, selectively etching the mask layer and the InGaAs layer to a predetermined depth such that a remaining layer of InGaAs electrically isolates the laser diode section from the modulator section.