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Effect of linear gain saturation on small-signal dynamics of MQW DFB lasers

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3 Author(s)
Hong, J. ; Adv. Technol. Lab., Bell-Northern Res., Ottawa, Ont., Canada ; Huang, W.P. ; Makino, T.

The linear gain saturation effect is shown to be important in determining the dynamics of multiple-quantum-well (MQW) distributed-feedback (DFB) lasers. A more realistic logarithmic dependence of material gain on carrier density is assumed in a comprehensive MQW DFB laser model. It is found through simulation that because of the linear gain saturation, the interplay between modal gain and differential gain leads to an optimal kappa L for maximum small-signal modulation bandwidth in lambda /4-shifted MQW DFB lasers.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:5 ,  Issue: 12 )