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Partly gain-coupled 1.55 μm strained-layer multiquantum-well DFB lasers

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6 Author(s)
Li, G.P. ; Bell-Northern Res., Ottawa, Ont., Canada ; Makino, T. ; Moore, R. ; Puetz, N.
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1.55-μm gain-coupled InGaAsP-InP distributed feedback (DFB) lasers which use a strained-layer multi-quantum-well (MQW) active grating for a mixed index and gain coupling have been fabricated and studied. The lasers exhibit distinct longitudinal-mode behaviour due to gain-coupling effects, including a high single-mode yield. Cavity length dependence of the mode behavior has been experimentally studied and simulated using a transfer-matrix method. Both experimental and theoretical results indicate that the shorter cavity lasers with the present structure have higher κgainLinde ratios and wider Fabry-Perot mode spacing than the longer cavity ones; these features enable the shorter cavity lasers to have a high single-mode yield (90%) and a high side-mode-suppression ratio (55 dB)

Published in:

Quantum Electronics, IEEE Journal of  (Volume:29 ,  Issue: 6 )

Date of Publication:

Jun 1993

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