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Optica Publishing Group
  • CLEO/Europe and EQEC 2009 Conference Digest
  • (Optica Publishing Group, 2009),
  • paper CB13_5

High-Speed Tuning in Vertical-Cavity Surface-Emitting Lasers

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Abstract

Compared to edge-emitting lasers VCSELs have a higher FM modulation cut-off frequency in the range of several 10 kHz [1, 4] as well as a higher current tuning coefficient. Furthermore, a slope of approximately −1/2 in doubly logarithmic scale of the FM amplitude response was observed up to 1 MHz [1]. To explain the unique frequency response of the laser FM tuning, physically motivated models exist for DFB lasers as well as VCSELs [2, 3]. The VCSEL model yields an asymptotic slope of −1/2 for high frequencies as a result of the model assumption of an infinitely thin active region which is in agreement with the aforementioned measurement data. Although VCSELs have rather thin structures, a deviation from this “square root” behaviour is expected at high modulation frequencies, which is investigated in this paper.

© 2009 IEEE

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