The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 04, 2000
Filed:
Dec. 16, 1997
Jonathan Heffernan, Oxford, GB;
Geoffrey Duggan, Deddington, GB;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A separate confinement heterostructure (SCH) laser device (LD) has: a quantum well active region within an optical guiding region; and, n-type and p-type cladding regions provided on opposite sides of the optical guiding region. An electron-capture layer is provided in the n-side portion of the optical guiding region. The composition of the electron-capture layer is set in such a manner that the minimum energy for X-electrons in the conduction band is lower than that in the surrounding parts of the active region and/or the n-side portion of the optical guiding region. The electron-capture layer is thick enough to bind X-electrons so that, in use, the electron-capture layer promotes the capture of the X-electrons. The electron-capture layer is disposed sufficiently close to the active region to permit transfer ot the captured X-electrons to at least one .GAMMA.-confined level in the active region.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile