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1.55-mum vertical-cavity surface-emitting lasers with superior modulation bandwidth in excess of 10-GHz up to 85degC and reduced parasitics are demonstrated. Output power and threshold are invariant with temperature. Bit-rates of 12.5 or 17-Gb/s are expected.
Servo drives comprise a significant potential of energy saving which has not been considered sufficiently up to now. Simple changes in the motion control of energy optimal and jerk limited motions can be implemented which lead to a reduced acceleration rms-value and slightly increased maximal acceleration. The resulting reduction factors for dimensions and moved masses lead even to further savings...
State-of-the-art doubly-fed induction generator drives avoid operation at synchronous speed. Engineers point out stability problems and unequal heating of semiconductors and windings as the main reasons. The latter problem is consequence of unequal losses distribution in the semiconductors and rotor windings. This work investigates the thermal behaviour of the inverter switches at this singular point...
The passive turn-on of IGBTs occurs in Matrix converter applications. This paper analyzes different IGBT-types in terms of passive turn-on. Measurements of passive turn-ons of different IGBT-types are shown and compared with diode turn-ons. The dependency of the turn-on voltage peak on the temperature, the gate resistance and the current is investigated. The results are analyzed by numerical device...
VCSELs at 1.55-mum with reduced parasitics and improved active region provide superior modulation-bandwidths >10 GHz up to 85degC. These bandwidths enable potential bit-rates of 12.5 or even 17 Gb/s for cost-effective 100 G Ethernet solutions.
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