A real boost of the throughput can be
achieved with RGB-LEDs using WDM. The
principle is shown in Fig. 3. DMT via WDM
channels and VLC was studied in detail in [3]
using a commercially available high-power whitelight
RGB-LED as the optical source and WDM
pass-band filters combined with an APD as the
receiver element. Compared to single-color
transmission, the aggregate data rate was extended
to 1.25 Gb/s at an illuminance level of 1000 lx
at the receiver, a value within the range recommended
by the European lighting standard (EN
12464-1 from 2003) for working environments.
Based on a similar offline-processed WDM-VLC
setup and a low-power RGB-LED, the authors in
[10] reported an aggregate data rate of 3.4 Gb/s.
Of course, WDM is also applicable for setting
up bidirectional VLC links operating in a full
duplex mode. Corresponding experiments for
proof of principle by means of offline processing
are described, for example, in [12]. There it was
shown recently that bidirectional VLC links can
provide capacities of more than just a few hundred
megabits per second.
REAL-TIME 500 MB/S
A real boost of the throughput can be
achieved with RGB-LEDs using WDM. The
principle is shown in Fig. 3. DMT via WDM
channels and VLC was studied in detail in [3]
using a commercially available high-power whitelight
RGB-LED as the optical source and WDM
pass-band filters combined with an APD as the
receiver element. Compared to single-color
transmission, the aggregate data rate was extended
to 1.25 Gb/s at an illuminance level of 1000 lx
at the receiver, a value within the range recommended
by the European lighting standard (EN
12464-1 from 2003) for working environments.
Based on a similar offline-processed WDM-VLC
setup and a low-power RGB-LED, the authors in
[10] reported an aggregate data rate of 3.4 Gb/s.
Of course, WDM is also applicable for setting
up bidirectional VLC links operating in a full
duplex mode. Corresponding experiments for
proof of principle by means of offline processing
are described, for example, in [12]. There it was
shown recently that bidirectional VLC links can
provide capacities of more than just a few hundred
megabits per second.
REAL-TIME 500 MB/S
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