Patent ID: 6084898
Filing Date: 2000-07-04
Classification: B82Y,H01S

Abstract:
A separate confinement heterostructure (SCH) laser device (LD), comprising a heterostructure which includes:an optical guiding region;an active region having at least one energy well, the active region being provided in the optical guiding region; andn-type and p-type cladding regions provided on opposite sides of the optical guiding region,wherein a first electron-capture layer is provided in the active region or in a predetermined portion of the optical guiding region which is disposed between the active region and the n-type cladding region,a composition of the first electron-capture layer is set in such a manner that the electron-capture layer has an X-minimum which is lower than that in adjacent parts of the heterostructure,the first electron-capture layer is thick enough to bind X-electrons so that, in use, the first electron-capture layer promotes capture of the X-electrons, andthe first electron-capture layer is disposed sufficiently close to the active region to permit transfer of the captured X-electrons to at least one .GAMMA.-confined level in the active region.