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Optica Publishing Group
  • Conference on Optical Fiber Communication/International Conference on Integrated Optics and Optical Fiber Communication
  • 1993 OSA Technical Digest Series (Optica Publishing Group, 1993),
  • paper ThB1
  • https://doi.org/10.1364/OFC.1993.ThB1

Gain-coupled DFB lasers

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Abstract

In conventional DFB semiconductor lasers the distributed feedback of optical waves is provided by the periodic perturbation of the waveguide index along the laser axis. This index-coupled DFB laser has a troublesome problem of producing a pair of longitudinal modes having equal threshold gains. Kogelnik and Shank predicted that this threshold degeneracy could be removed if the optical feedback was provided by the periodic perturbation of the waveguide gain coefficient [J. Appl. Phys. 43, 2327 (1972)].

© 1993 Optical Society of America

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