Impact of device parameters on thermal performance of high speed oxide confined 850 nm VCSELs
Artikel i vetenskaplig tidskrift, 2012

We study the impact of device parameters, such as inner-aperture diameter and cavity photon lifetime, on thermal rollover mechanisms in 850-nm, oxide-confined, vertical-cavity surface-emitting lasers (VCSELs) designed for high-speed operation. We perform measurements on four different VCSELs of different designs and use our empirical thermal model for calculating the power dissipated with increasing bias currents through various physical processes such as absorption within the cavity, carrier thermalization, carrier leakage, spontaneous carrier recombination, and Joule heating. When reducing the top mirror reflectivity to reduce internal optical absorption loss we find an increase of power dissipation due to carrier leakage. There is therefore a trade-ff between the powers dissipated owing to optical absorption and carrier leakage in the sense that overcompensating for optical absorption enhances carrier leakage (and vice versa). We further find that carrier leakage places the ultimate limit on the thermal performance for this entire class of devices. Our analysis yields useful design optimization strategies for mitigating the impact of carrier leakage and should thereby prove useful for the performance enhancement of 850-nm, highspeed, oxide-confined VCSELs.

photon lifetime

Carrier leakage

vertical cavity surface emitting lasers

thermal effects


Prashant Baveja

Benjamin Kögel

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Petter Westbergh

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Johan Gustavsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Åsa Haglund

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

Drew Maywar

Govind Agrawal

Anders Larsson

Chalmers, Mikroteknologi och nanovetenskap (MC2), Fotonik

IEEE Journal of Quantum Electronics

0018-9197 (ISSN)

Vol. 48 17-26


Informations- och kommunikationsteknik


Elektroteknik och elektronik