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We propose a configuration of a wavelength division multiplexing (WDM)-visible light communication (VLC) system using orthogonal frequency division multiplexing (OFDM) modulation and an adaptive Nyquist windowing of the OFDM signal in the receiver. Based on this configuration, we demonstrate a 750-Mb/s WDM-VLC transmission based on RGB light-emitting diode (LED) with a distance of 70 cm. The measured bit error rate (BER) for all channels are under the pre-forwaxd error correction limit of 3,8 × 10-3. The BER performances of all the channels of the proposed WDM-VLC system show considerable improvement compared with those of the system without Nvauist windowing. 相似文献
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We propose an integral imaging system that uses three lens arrays, including two convex lens arrays and a concave lens array. Compared with the conventional integral imaging system, the proposed system can remarkably enhance the viewing angle. The maximum viewing angle can be enlarged to 48~, which is 4.8 times wider than that of the conventional system. The principle of the proposed system is elucidated, and the experimental results are presented in this letter. 相似文献
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相干且频率锁定的正交多载波光源产生技术在光通信领域有着诸多应用,能广泛用于微波光子学、全光信号处理以及波分复用(WDM)技术和正交频分复用(OFDM)技术.互联网数据业务的快速增长使得超宽带大容量骨干网传输技术越来越受到世界各国的重视,而要实现Tb/s超大容量传输,目前使用的最主要的方法是光的波分复用(WDM)或正交频分复用(OFDM)技术.作为实现光WDM或OFDM的一项关键技术,相干和频率锁定的正交多波长光源技术引起了国内外各大科研机构的强烈关注.介绍了国内外多载波技术的现状以及多载波产生的多种方案,并对每一个方案进行了对比分析,为未来的研究提供了一些参考. 相似文献
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The generation of coherent optical subcarriers based on a concatenated dual-drive Mach-Zehnder intensity modulator(IM) and two phase modulators(PMs) is proposed and experimentally demonstrated.The modulation index and DC bias of PM+IM modulation are theoretically investigated.Theoretical analysis and numerical study are also carried out to examine the proposed scheme.We use 25-GHz RF synchronous sinusoidal signals to drive cascaded two-stage PMs and IM,through which we generate 28 subcarriers with peak power fluctuations less than 4 dB.The measured tone-to-noise ratio of the subcarrier is higher than 40 dB.The experimental results show that for 100-Gb/s polarization multiplexing QPSK signal,the receiver sensitivity of the back-to-back signal is -28.6 dBm,and the power penalty is lower than 1 dB after 100-km transmission at the BER of 1×10-9. 相似文献
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LED替代白炽灯和日光灯用于照明已经成为明显的趋势。LED可以同时用于照明与通信的特点,使得可见光通信(VLC)成为了近年来国内外研究的热点。由于其具有无辐射、抗电磁干扰、频谱使用无需授权等优势,VLC已成为下一代高速无线接入的新兴技术。目前VLC发展的主要挑战在于LED有限的调制带宽限制了VLC系统的传输速率。针对这一瓶颈,从VLC系统多维复用方式出发,详细介绍了波分复用、频分复用、偏振复用和空分复用四种复用技术,实现多路复用信号并行传输,从而有效提升系统的传输容量。通过对这四种技术原理和性能的分析与讨论,验证了多维复用技术在提升VLC系统传输容量上的可行性,表明了其在VLC系统中广泛的应用前景。 相似文献
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