Distributed-feedback buried heterostructure (DFB-BH) GaInAsP/InP lasers in the 1.5 μm wavelength region have been operated continuously at heat-sink temperatures as high as 310 K. A threshold current of 55 mA at 300 K and single longitudinal mode operation have been obtained.
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Matsuoka et al. (1982) studied this question.
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