Transverse mode dynamics of VCSELs undergoing current modulation

Peter M. Goorjian, Cun-Zheng Ning, Govind P. Agrawal

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


Transverse mode dynamics of a 20-μm-diameter vertical-cavity surface-emitting laser (VCSEL) undergoing gain switching by deep current modulation is studied numerically. The direct current (dc) level is set slightly below threshold and is modulated by a large alternating current (ac). The resulting optical pulse train and transverse-mode patterns are obtained numerically. The ac frequency is varied from 2.5 GHz to 10 GHz, and the ac amplitude is varied from one-half to four times that of the dc level. At high modulation frequencies, a regular pulse train is not generated unless the ac amplitude is large enough. At all modulation frequencies, the transverse spatial profile switches from single-mode to multiple-mode pattern as the ac pumping level is increased. Optical pulse widths vary in the range 5-30 ps, with the pulse width decreasing when either the frequency is increased or the ac amplitude is decreased. The numerical modeling uses an approximation form of the semiconductor Maxwell-Bloch equations. Temporal evolution of the spatial profiles of the laser (and of carrier density) is determined without any assumptions about the type or number of modes.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSociety of Photo-Optical Instrumentation Engineers
StatePublished - 2000
Externally publishedYes
EventPhysics and Simulation of Optoelectronic Devices VIII - San Jose, CA, USA
Duration: Jan 24 2000Jan 28 2000


OtherPhysics and Simulation of Optoelectronic Devices VIII
CitySan Jose, CA, USA

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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