Patent ID: 6256333
Filing Date: 2001-07-03
Classification: B82Y,H01S

Abstract:
A VCSEL structure comprising:first mirror;second mirror;an active gain region situated between said first and second mirrors;first spacer situated between said first mirror and said active gain region; andsecond spacer situated between said second mirror and said active gain region; andwherein a first portion of said first spacer adjacent to said active gain region is substantially undoped, and a first portion of said second spacer adjacent to said active gain region is moderately doped;wherein said second spacer comprises a dopant of a first type;wherein said first mirror comprises a dopant of a second type and said second mirror comprises a dopant of the first type;wherein ""moderately doped"" means a doping level greater than 3e17;wherein said first spacer has a composition of greater than 20 percent aluminum and said second spacer has a composition of greater than 20 percent aluminum;wherein said active gain region has a set of alternating layers wherein every other layer has a composition of at least 15 percent aluminum and a layer between the every other layer has a composition of about zero percent aluminum; andwherein:the dopant level of the first portion of said first spacer, adjacent to said gain region, is less than 3e17; andthe dopant level of the first portion of said second spacer, adjacent to said active gain region, is about 1e18.