Light-emitting diodes (LEDs), which will be increasingly used in lighting technology, will also allow for distribution of broadband optical wireless signals. Visible-light communication (VLC) using white LEDs offers several advantages over the RF-based wireless systems, i.e., license-free spectrum, low power consumption, and higher privacy. Mostly, optical wireless can provide much higher data rates. In this paper, we demonstrate a VLC system based on a white LED for indoor broadband wireless access. After investigating the nonlinear effects of the LED and the power amplifier, a data rate of 1 Gb/s has been achieved at the standard illuminance level, by using an optimized discrete multitone modulation technique and adaptive bit- and power-loading algorithms. The bit-error ratio of the received data was 1.5 10^(-3), which is within the limit of common forward error correction (FEC) coding. These results twice the highest capacity that had been previously obtained
In this paper, we experimentally realized a gigabit-class indoor visible light communication system using commercially available RGB White LED and exploiting an optimized DMT modulation. We achieved data rate of 1.5 Gbit/s with single channel and 3.4 Gbit/s by implementing WDM transmission at standard illumination levels. In both experiments, the resulting bit error ratios were below the FEC limit. To the best of our knowledge, these values are the highest ever achieved in VLC systems.
output pulses of wavelength conversion based on NPR assisted with red-shifted filtering. It is obvious that simulated results in Figure 4 are in well agreement with experimental results in Figure 7, which proves the validity of the model developed by us. The output ERs of the two kinds of wavelength conversion schemes are about 4 dB and 15.6 dB, respectively. The difference of the output ERs between simulated results and experimental results derives from the fact that ASE of SOA is not considered in simulation.
CONCLUSIONSA wavelength conversion scheme based on NPR assisted with red-shifted filtering is presented. To investigate the performance of the wavelength conversion scheme, we develop a model of wavelength conversion based on NPR assisted with red-shifted filtering. Simulated results based on this model agree well with the experimental results. Simulated analyses and experimental results show that high performance wavelength conversion based on NPR is achieved using a red-shifted filtering scheme.
TRANSMISSION CHARACTERISTICS OF MULTIPLE ELLIPTICLE RIDGE WAVEQUIDE
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