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Bipolar cascade laser sources for directly modulated links

Abstract : We report on the improvement of the opto-RF link characteristics by the use of directly-modulated bipolar cascade laser sources. A theoretical as well as experimental study enables to improve by a factor n2 the RF link gain with the use of n discrete lasers. In addition, we improve by 3 dB the relative intensity noise of a laser source composed of two discrete lasers. To circumvent bandwidth limitations, we study, through the development of a rate equation model, and through the improvement of a self-consistent transport model, the influence of monolithically cascading several active junctions into a single-transverse-mode bipolar cascade structure. Eventually, the developed models are used to design the component and we present some characterizations. Due to the low tunnel junction conductivity, the device exhibits an important current spreading. In addition, the carrier distribution in the biased cavity increases the optical internal loss. Despite these limitations, we obtain a quantum internal differential efficiency greater than 100% and a single-transverse-mode bipolar cascade laser with enhanced external differential efficiency.
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Contributor : Ecole Télécom ParisTech Connect in order to contact the contributor
Submitted on : Friday, February 18, 2005 - 8:00:00 AM
Last modification on : Friday, July 31, 2020 - 10:44:07 AM
Long-term archiving on: : Thursday, September 30, 2010 - 6:21:43 PM


  • HAL Id : pastel-00001046, version 1



Frédéric Dross. Bipolar cascade laser sources for directly modulated links. domain_other. Télécom ParisTech, 2004. English. ⟨NNT : 2004 E 017⟩. ⟨pastel-00001046⟩



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