Abstract
We investigated the waveguide loss of lateral-current-injection (LCI) type GaInAsP/InP membrane Fabry–Pérot lasers by adopting low-doped p-InP cap and side cladding layers. An internal quantum efficiency of 75% was obtained, and waveguide loss was reduced to 22 cm−1, which was approximately half of that in our previous report. Further, a differential quantum efficiency higher than 50% was obtained for devices with cavity length less than 400 µm. These results indicate the possibility of sub-mA threshold current and high-efficiency operation of LCI type membrane distributed feedback and distributed-reflector lasers with active region length less than 100 µm.
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