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22 GHz-bandwidth 1.5 mu m compressively strained InGaAsP MQW ridge-waveguide DFB lasers

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3 Author(s)

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*10-16 cm2 is reported for the doped strained MQW structure used.

Published in:

Electronics Letters  (Volume:29 ,  Issue: 21 )