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VCSELs (Vertical-cavity surface-emitting lasers) offer a number of unique advantages: a threshold current that is low and stable with temperature so that electricity is converted to light with a very high efficiency; the ability to be modulated at very high frequencies; a circular output beam with low divergence, simplifying the optical system. Lifetime parameters are not degraded when overdriving...
For interconnections between the stations of mobile networks optical links are frequently used. The mobile networks require new modulation methods to achieve higher transmission capacity. For that purpose the m-QAM modulation method is a proper approach. On the other hand, the signal transmission in the mobile network is strongly affected by multipath wave propagation. The OFDM modulation can counterbalance...
This paper introduces a novel approach for transmitting UWB signals over optical fibre with cost effective Vertical-cavity surface-emitting laser (VCSEL). The transmitted impulse compile with the strict European frequency plan (ECC). A prototype filter is presented with lumped elements which has a −40 dB/500 MHz cut off at the critical 3.1 GHz band. Also a novel impedance matching method is presented...
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