Abstract

We report novel design considerations for graded separate confinement heterostructure (SCH) cavities of oxide-confined vertical-cavity surface-emitting lasers (VCSELs). Using a self-consistent effective-index method, we have analyzed ungraded, linearly and exponentially graded SCH cavities of an 850-nm VCSEL. An ungraded SCH gives the best optical-confinement factor, while linear and exponential gradings reduce the factor by 18% and 9%, respectively. Grading the SCH cavities of oxide-confined VCSELs leads to both a shift in the resonant wavelength as well as a decrease in the optical-confinement factor. The resonant-wavelength shifts in graded SCH cavities are attributed to two competing effects: the formation of an effective-index step that redefines the λ cavity, and larger optical-field leakage, which relaxes the confinement. We have also demonstrated that wavelength shifts can be easily compensated by optimized width extensions of the aperture layers which sandwich the graded SCH cavity, without further reducing the optical-confinement factor. Based on a revised understanding of the resonances for graded SCH cavities,we can therefore control the design of graded SCH VCSELs to obtain a desired resonant wavelength with great precision.

[IEEE ]

PDF Article

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription