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Impact of device parameters on thermal performance of high speed oxide confined 850 nm VCSELs

Prashant Baveja ; Benjamin Kögel (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Petter Westbergh (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Johan S. Gustavsson (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Åsa Haglund (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Drew Maywar ; Govind Agrawal ; Anders Larsson (Institutionen för mikroteknologi och nanovetenskap, Fotonik)
IEEE Journal of Quantum Electronics (0018-9197). Vol. 48 (2012), 1, p. 17-26.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Carrier leakage; photon lifetime; thermal effects; vertical cavity surface emitting lasers



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Denna post skapades 2012-01-02. Senast ändrad 2016-04-11.
CPL Pubid: 151466

 

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