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Above-threshold analysis of loss-coupled DFB lasers: threshold current and power efficiency

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1 Author(s)
S. K. C. Liew ; Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Shatin, Hong Kong

The threshold current and power efficiency of loss-coupled DFB lasers have been calculated numerically using an above-threshold model. Compared with perfectly AR-coated devices, lasers with asymmetric facet coatings have substantially lower threshold current. However, significantly higher front-facet power efficiency is only possible at small grating-coupling coefficients. In particular, the range of loss-coupling coefficients for higher efficiency becomes narrower with larger grating duty cycle and larger index-coupling coefficient. These results can be explained by the interdependence of the reflectivity and extra loss associated with loss-coupled gratings.

Published in:

IEEE Photonics Technology Letters  (Volume:7 ,  Issue: 12 )