Abstract
By adopting a relatively large amount (54 nm) of Bragg wavelength detuning from the gain peak wavelength of active regions, temperature dependences of threshold current density and differential quantum efficiency were markedly improved in a GaInAsP/InP distributed feedback laser with wirelike active regions emitting at 1600 nm. A stable single-longitudinal-mode operation with a sub-mode suppression ratio of 51 dB (at a bias current of 2 times the threshold) was obtained at room temperature. Variations of threshold current density and differential quantum efficiency between 10 and 85 °C were reduced to as low as ±19 and ±24%, respectively; hence, the variation of the operating current required for a certain output power in this temperature range was reduced to 1/2 to 1/3 of that without Bragg wavelength detuning.
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