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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 16 — Aug. 1, 2011
  • pp: 15490–15505

Assessment of VCSEL thermal rollover mechanisms from measurements and empirical modeling

Prashant P. Baveja, Benjamin Kögel, Petter Westbergh, Johan S. Gustavsson, Åsa Haglund, Drew N. Maywar, Govind P. Agrawal, and Anders Larsson  »View Author Affiliations


Optics Express, Vol. 19, Issue 16, pp. 15490-15505 (2011)
http://dx.doi.org/10.1364/OE.19.015490


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Abstract

We use an empirical model together with experimental measurements for studying mechanisms contributing to thermal rollover in vertical-cavity surface-emitting lasers (VCSELs). The model is based on extraction of the temperature dependence of threshold current, internal quantum efficiency, internal optical loss, series resistance and thermal impedance from measurements of output power, voltage and lasing wavelength as a function of bias current over an ambient temperature range of 15–100°C. We apply the model to an oxide-confined, 850-nm VCSEL, fabricated with a 9-μm inner-aperture diameter and optimized for high-speed operation, and show for this specific device that power dissipation due to linear power dissipation (sum total of optical absorption, carrier thermalization, carrier leakage and spontaneous carrier recombination) exceeds power dissipation across the series resistance (quadratic power dissipation) at any ambient temperature and bias current. We further show that the dominant contributors to self-heating for this particular VCSEL are quadratic power dissipation, internal optical loss, and carrier leakage. A rapid reduction of the internal quantum efficiency at high bias currents (resulting in high temperatures) is identified as being the major cause of thermal rollover. Our method is applicable to any VCSEL and is useful for identifying the mechanisms limiting the thermal performance of the device and to formulate design strategies to ameliorate them.

© 2011 OSA

OCIS Codes
(060.4510) Fiber optics and optical communications : Optical communications
(140.6810) Lasers and laser optics : Thermal effects
(200.4650) Optics in computing : Optical interconnects
(230.1150) Optical devices : All-optical devices
(250.7260) Optoelectronics : Vertical cavity surface emitting lasers

ToC Category:
Optoelectronics

History
Original Manuscript: May 23, 2011
Revised Manuscript: July 4, 2011
Manuscript Accepted: July 11, 2011
Published: July 28, 2011

Citation
Prashant P. Baveja, Benjamin Kögel, Petter Westbergh, Johan S. Gustavsson, Åsa Haglund, Drew N. Maywar, Govind P. Agrawal, and Anders Larsson, "Assessment of VCSEL thermal rollover mechanisms from measurements and empirical modeling," Opt. Express 19, 15490-15505 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-16-15490


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