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Electrical characterisation of p-doped distributed Bragg reflectors in electrically pumped GaInNAs VCSOAs for 1.3μm operation

Chaqmaqchee, F A I and Mazzucato, S and Sun, Y and Balkan, Naci and Tiras, E and Hugues, M and Hopkinson, M (2012) 'Electrical characterisation of p-doped distributed Bragg reflectors in electrically pumped GaInNAs VCSOAs for 1.3μm operation.' Materials Science and Engineering: B, 177 (10). pp. 739-743. ISSN 0921-5107

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Abstract

The high resistivity that is encountered in p-type DBRs is an important problem in vertical cavity surface emitting lasers and optical amplifiers (VCSELs and VCSOAs). This is because the formation of potential barriers at the interfaces between layers of high and low refractive index inhibits the carrier flow, thus increasing the DBR series resistance. In this work, the electrical characteristics of two p-type doped DBR structures grown on undoped and p-type doped GaAs substrates have been investigated. The DBRs are designed for VCSOAs operating at 1.3 mu m and consist of 14-periods of alternating GaAs and Al0.9Ga0.1As in the first sample and 14-periods of GaAs and Al0.3Ga0.3As/Al0.9Ga0.1 As in the second one. For the longitudinal transport sample. Hall mobility and sheet carrier density were measured in the temperature range from 77 to 300 K. In the vertical transport sample, current-voltage (l-V) measurements across the DBR layers were carried out at different temperatures in the range between 15 and 300K. We achieved resistivity reduction in our samples by using an interface composition grading technique aimed at improving the VCSOA characteristics.

Item Type: Article
Uncontrolled Keywords: p-Type DBRs;VCSELs;VCSOAs;GaInNAs
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Divisions: Faculty of Science and Health > Computer Science and Electronic Engineering, School of
Depositing User: Clare Chatfield
Date Deposited: 12 Jan 2015 10:28
Last Modified: 12 Jan 2015 10:28
URI: http://repository.essex.ac.uk/id/eprint/9051

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