A DFB laser with a modulation bandwidth of 22 GHz together with a sidemode suppression in excess of 50 dB is reported. The wide bandwidth is achieved by using a doped SCH region which is sufficiently thick to accommodate a DFB grating, and a ridge-waveguide structure with patterned p-side metallisation to give very low parasitic capacitance. A differential gain of 25×10−16cm2 is reported for the doped strained MQW structure used.
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Wright et al. (1993) studied this question.
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