InP-based highspeed-VCSELs with novel short-cavity design for application in access networks

We present 1.55 μm BTJ short-cavity VCSELs for application in access networks. A detailed analysis of the modulation performance of these long-wavelength devices is given. Record high modulation bandwidths in excess of 16 GHz for temperatures up to 50°C and high parasitic cut-off frequencies of 23 GHz are extracted from S-parameter measurements. This excellent modulation performance is due to the applied high-speed layout and the novel short-cavity design, improving optical and electrical device properties at the same time. Strongly increased relaxation-resonance frequencies and a reduced photon lifetime as well as an increased intrinsic damping rate are reported for these short-cavity VCSELs.