14 July 2000 Transverse mode dynamics of VCSELs undergoing current modulation
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Proceedings Volume 3944, Physics and Simulation of Optoelectronic Devices VIII; (2000) https://doi.org/10.1117/12.391431
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States
Transverse mode dynamics of a 20-micrometer-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.
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Peter M. Goorjian, Peter M. Goorjian, Cun-Zheng Ning, Cun-Zheng Ning, Govind P. Agrawal, Govind P. Agrawal, } "Transverse mode dynamics of VCSELs undergoing current modulation", Proc. SPIE 3944, Physics and Simulation of Optoelectronic Devices VIII, (14 July 2000); doi: 10.1117/12.391431; https://doi.org/10.1117/12.391431

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