Patent ID: 6856631
Filing Date: 2005-02-15
Classification: B82Y,H01S

Abstract:
1. A semiconductor device comprising: a semiconductor substrate of a first conductivity type; a first cladding layer of said first conductivity type formed on said semiconductor substrate; an active layer formed on said first cladding layer; a second cladding layer of a second conductivity type formed on said active layer; and a saturable absorbing layer formed on at least portions of at least one of said first cladding layer and said second cladding layer; wherein said saturable absorbing layer is formed to have a band gap energy either approximately the same as, or slightly smaller than, said active layer, and also to be doped with nitrogen (N) in an amount sufficient to form a localized level; wherein said saturable absorbing layer includes a III-V alloy material; and wherein said saturable absorbing layer comprises at least one of As and P.