Delayed self-heterodyne linewidth measurement of VCSELs

@article{Schmid1996DelayedSL,
  title={Delayed self-heterodyne linewidth measurement of VCSELs},
  author={Willy A. Schmid and Choong Hwan Jung and B. Weigi and Gerald Reiner and Rainer Michalzik and Karl Joachim Ebeling},
  journal={IEEE Photonics Technology Letters},
  year={1996},
  volume={8},
  pages={1288-1290}
}
We report on high-resolution linewidth measurements of proton-implanted InGaAs-GaAs VCSELs employing the delayed self-heterodyne method. Devices with 16-/spl mu/m active diameter exhibit record low linewidths of 20 MHz and 4-MHz residual linewidth. The linewidth enhancement factor is accurately determined from the ratio of induced phase to amplitude modulation indexes. 

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