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Numerical investigation of self-heating effects of oxide-confined vertical-cavity surface-emitting lasers

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4 Author(s)
Yang Liu ; Dept. of Electr. & Comput. Eng., Univ. of Illinois, Urbana, IL, USA ; Wei-Choon Ng ; Choquette, K.D. ; Hess, K.

We present a comprehensive numerical model to simulate self-heating effects of oxide-confined vertical-cavity surface-emitting lasers (VCSELs) under continuous-wave operation. The model self-consistently accounts for the close interaction between optical, electrical, and thermal processes in VCSELs. In particular, hot carriers and nonequilibrium optical phonons in the quantum wells are modeled by solving a carrier energy balance equation and an optical phonon rate equation. Our numerical simulations reveal that they are responsible for aggravated thermal rollovers in VCSELs' L-I characteristics. Detailed comparisons are made and good agreement is obtained between simulations and experiments for the L-I-V and lasing wavelength characteristics of VCSELs with varying oxide aperture size. Various mechanisms that result in the L-I thermal rollover behavior are also investigated with the aid of simulations.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:41 ,  Issue: 1 )