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:
Dec. 12, 2000
Filed:
Jan. 25, 1999
Jeffrey W Scott, Boulder, CO (US);
Cielo Communications, Inc., Broomfield, CO (US);
Abstract
A vertical cavity surface emitting laser (VCSEL) with variable tuning layer for adjusting the slope of the laser and method for manufacturing the same are disclosed. In practice, a VCSEL wafer is grown by any conventional technique, and fabricated into discrete lasers while maintained in wafer form. The initial lasers are then tested to determine characteristics, such as the slope efficiency distribution. A variable thickness dielectric layer is then deposited which is calculated to tune the slope efficiency distribution to within a target specification by altering the phase of the top facet reflectivity of the initial lasers. The resulting change in transmission directly changes the laser slope in a predictable fashion. The tuning step may be repeated, if necessary, to further refine the slope to the desired value. The method produces VCSELs with similar or consistent slopes from a plurality of wafers. Also disclosed are an optical subassembly and optical transceiver incorporating the improved VCSELs.