Patent ID: 6396861
Filing Date: 2002-05-28
Classification: B82Y,H01S

Abstract:
An n-type modulation-doped multi quantum well semiconductor laser device comprising a multi quantum well structure comprising a hetero-junction structure including well layers and barrier layers, whereineach said well layer is formed of an undoped semiconductor material and each said barrier layer is formed of a semiconductor material modulation-doped with an n-type dopant, and an anti-reflection film formed on a front facet and a high-reflection film formed on a rear facet, the device having a cavity length which is not shorter than 800 &mgr;m; the device having a mirror loss (&agr;m) which is not higher than 15 cmâˆ’1 and which is given by the following formula: &agr;m=(1/2L)ln{1/(RfÃ—Rr)}, where L is the cavity length in cm, Rf is the reflectance of the front facet, and Rr is the reflectance of the rear facet.