Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 64: Focus Session: Optical interconnects - Materials, devices, and integration
HL 64.6: Vortrag
Donnerstag, 19. März 2015, 12:15–12:30, EW 202
Temperature-dependent modulation and impedance characteristics of 980 nm VCSELs — •Hui Li1, Philip Wolf1, Philip Moser1, Gunter Larisch1, James A. Lott1, and Dieter Bimberg1,2 — 1Institut für Festkörperphysik und Zentrum für Nanophotonik, Technische Universität Berlin, Hardenbergstraße 36, D-10623, Berlin, Federal Republic of Germany — 2King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia
Multimode optical fibre interconnects based on vertical-cavity surface-emitting lasers (VCSELs) are a key enabling technology for short-reach data communication. Considering cost, long-term system sustainability, and reliability, optical interconnects must operate without extra cooling, implying the VCSELs must operate at much elevated temperatures. By introducing a -15 nm QW gain-to-cavity etalon wavelength offset, the temperature-stability, the maximum bit rate at high temperature, and the energy efficiency of our VCSELs are simultaneously improved. We present temperature stable 980 nm VCSELs capable of operating error-free at 38 Gb/s at 25 up to 85 °C without any change of working point and modulation conditions. A small-signal equivalent circuit model is fitted to measured scattering parameters to extract the circuit elements, -3 dB modulation bandwidth, D-factor, and parasitic cutoff frequency. Showing large values of -3 dB modulation bandwidth and D-factor both at room temperature and elevated temperatures, our VCSELs achieve high-speed, temperature-stable and energy-efficiency operation simultaneously, which makes these VCSELs well suited for very-short-reach and ultra-short-reach optical interconnects.