A high differential quantum efficiency of about 50% from the front facet and low threshold current operation have been achieved. By modifying the doping profile in 1.55-mum distributed reflector lasers, waveguide loss was reduced from 6-7 to 4 cm-1. Injection currents of 4.2 and 3.6 mA were obtained to achieve a 1-mW output power for lasers with uniform and phase-shifted grating structures, respectively.
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Shindo et al. (2009) studied this question.
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