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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 16,
  • Issue 6,
  • pp. 1088-
  • (1998)

The Symmetry of the Amplified Spontaneous Emission Spectrum in Complex-Coupled DFB Lasers

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Abstract

We present relations between facet reflections and coupling coefficient for the amplified spontaneous emission (ASE) spectrum of a complex-coupled, an index-coupled, and a gain-coupled distributed feedback (DFB) laser to have a mirror image with respect to the Bragg wavelength. We show that the ASE spectrum of a complex-coupled DFB laser cannot be symmetric in general with respect to the Bragg wavelength. The index-coupled and gain-coupled DFB lasers can have symmetric ASE spectrum for some values of the phase of the facet reflection coefficient that are determined.

[IEEE ]

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