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DFB laser with nonuniform coupling coefficient realized by double-layer buried grating

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6 Author(s)
Nilsson, S. ; Swedish Inst. of Microelectron., Kista, Sweden ; Kjellberg, T. ; Klinga, T. ; Wallin, J.
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A technique for the realization of a nonuniform grating coupling coefficient kappa , and its implementation in distributed-feedback (DFB) lasers is presented. This technique, which is an extension of the buried-grating concept, offers precise control of the coupling coefficient and enables a kappa -ratio greater than 10. DFB lasers with an asymmetric kappa -variation have been fabricated using this method. A front-to-rear facet output power ratio close to five was obtained, qualitatively in agreement with simulations.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:5 ,  Issue: 10 )

Date of Publication:

Oct. 1993

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