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The large-signal modulation characteristics of 1.3 μm vertical-cavity surface-emitting lasers (VCSELs) with buried tunnel junction and reduced cavity length are presented. A short overview of the VCSEL design and static device characteristics is given. Employing these devices, the error-free data transmission at 25 Gbit/s over up to 25 km of singlemode fibre is reported for the first time. The impact...
Error free transmission over multimode fibre at data rates up to 3 2 Gbit/s at 25degC and 25 Gbit/s at 85degC using an oxide confined 850 nm VCSEL biased at a current density of 11-14kA/cm2 is demonstrated. The VCSEL is optimised for high-speed by reducing capacitance and self-heating and by using strained InGaAs quantum wells for high differential gain.
Recent results on directly modulated VCSELs, including high efficiency 980 nm devices operating error free at 20 Gbit/s without current adjustment between 25 and 85degC, will be reviewed. In addition, a novel electro-optically modulated (EOM) VCSEL concept employing an EOM Bragg reflector based on the Quantum Confined Stark Effect will be proposed and preliminary data presented.
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