Abstract
An approach for single mode operation of 1.3 /spl mu/m distributed feedback (DFB) lasers with a large side mode suppression ratio over a wide temperature range of -40/spl deg/C to 100/spl deg/C, is reported. The lasers utilize an optimized strained-layer multiquantum well (MQW) active region in combination with index/gain-coupling and detuning effect. A high characteristic temperature T/sub 0/ (90-100 K) was obtained in 1.3 /spl mu/m InGaAsP/InP strained-layer MQW Fabry-Perot lasers when the number of QWs exceeded 10. In gain-coupled DFB lasers, a very low temperature dependence of the threshold current has been obtained when there is no detuning or positive detuning of the lasing wavelength at room temperature with respect to the material gain peak. An infinite T/sub 0/ can be realized over certain temperature ranges, in which the threshold current exhibits a minimum, depending on the amount of detuning. The physical mechanism responsible for the appearance of this minimum, as well as the high side mode suppression ratio, are explained theoretically.
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