Tapered Waveguide InGaAs/InGaAsP Multiple-Quantum-Well Lasers

T. L. Koch, U. Koren, G. Eisenstein, M. G. Young, M. Oron, C. R. Giles, B. I. Miller

Research output: Contribution to journalArticlepeer-review

153 Scopus citations


We propose and demonstrate the application of ultra-thin etch-stop fabrication techniques to adiabatically expand the vertical optical mode size in 1.5 µm InGaAs/InGaAsP MQW lasers using a tapered-core passive intracavity waveguide structure. We achieve 30% differential quantum efficiency out the tapered facet, far-field FWHM of ~ 12°, and a butt-coupling efficiency into a cleaved fiber of -4.2 dB, with -1 dB alignment tolerances of ~ ± 3 ¼m.

Original languageEnglish (US)
Pages (from-to)88-90
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number2
StatePublished - Feb 1990

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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