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:
Oct. 26, 1999
Filed:
Mar. 25, 1998
Paul J Cannard, Woodbridge, GB;
Anthony J Dann, Ipswich, GB;
British Telecommunications public limited company, London, GB;
Abstract
A vertical cavity surface emitting laser includes a mirror having first and second layers with first layers containing the elements aluminum, arsenic and antimony and second layers comprising the elements gallium, phosphorus and antimony. Both of these layers are lattice matched to the semiconductor material of the active zone. A VCSEL usually contains two mirrors and, preferably, both mirrors are formed of the elements as specified above. Beryllium can be used to confer p-type conductivity on one mirror and silicon to confer n-type conductivity on the other mirror. Preferably the active zone is formed of semiconductors containing at least one of indium and gallium and at least of phosphorus and arsenic. Conveniently the active zone has a lattice constant substantially equal to that of the indium phosphide and both mirrors are lattice matched to this constant.