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多光谱可见光通信信道串扰分析

崔璐 唐义 朱庆炜 骆加彬 胡珊珊

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多光谱可见光通信信道串扰分析

崔璐, 唐义, 朱庆炜, 骆加彬, 胡珊珊

Analysis of channel crosstalk in muliti-spectrum visible light communication system

Cui Lu, Tang Yi, Zhu Qing-Wei, Luo Jia-Bin, Hu Shan-Shan
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  • 在可见光通信领域, 通过波分复用技术可以增加信道个数, 从而提高系统通信容量. 然而发光二极管(LED)的辐射光谱具有一定线宽, 当信道个数增加, 信道间隔将变小, 尽管有滤光片的通道选择, 但LED的辐射光谱会出现重叠从而产生信道串扰. 本文基于LED光谱重叠现象分析了多光谱波分复用可见光通信系统的信道串扰问题. 首先结合LED的物理机制和实际LED的光谱形状对其光谱进行建模; 然后根据光谱重叠现象和可见光通信信道推导出信道串扰公式; 最后利用不同中心波长的LED在两通道可见光通信系统中验证了信道串扰公式的正确性. 仿真和实验结果表明, 当两信道的信道间隔大于28 nm时, 两信道之间的信道串扰不超过-13.6 dB. 对多光谱波分复用可见光通信系统的信道串扰分析对未来可见光通信增加信道数量有一定指导作用.
    In visible light communication, the wavelength division mutiplexing (WDM) technology can improve system data rate by increasing the number of channels. However, because the emission spectrum of the light emitting diode (LED) has a certain width, a phenomenon of spectral overlapping will occur when the number of channels increases and channel-spacing decreases, which results in channel crosstalk although optical filters are adopted. The channel crosstalk will restrict the capacity of WDM-VLC (visible light communication) system, which has great research significance. In this paper, the channel crosstalk based on LED spectra overapping is disscussed. The LED emission spectrum is modeled by combining the physical mechanism of LED emission with real shape of LED spectrum. According to the literature, the LED shape can be fitted greatly by Gauss function, and the full-width at half-maximum E is in a range from about 4.3kBTj to 6.8kBTj when the peak wavelengths of InGaN and AlInGaN LEDs are both less than 560 nm, E values range from 2.1kBTj to 3.3kBTj when the peak wavelength of InAlGaP LED is larger than 560 nm. In order to reduce the overall system complexity we use the following values: when the peak wavelength is less than 560 nm, E = 5.5kBTj; when the peak wavelength is larger than 560 nm, E = 3.0kBTj. Then, according to the overlapping spectra and VLC channel with considering optical filter transmittance and detector spectral response, the channel crosstalk formula is derived. Some quantities are given before simulation such as the semi-angle at half illuminance of an LED is 60; all LEDs are so closely arranged together to mix light in free space that spacing between LEDs can be ignored with respect to the propagating distance; the strongest signal situation is considered. The simulation result shows that although at the same channel spacing, different channels have different crosstalks because spectra are different. And the crosstalk from one adjacent channel will not exceed -13.6 dB when channel-spacing is larger than and equal to 28 nm, which means that when OOK modulation is used and the BER achieve 10-6, the channel-spacing should not be less than 28 nm. Finally, an experiment of channel crosstalk with using two-channel WDM VLC system and LEDs with different wavelengths is conducted and the correctness of the crosstalk analysis is verified. The colors of red (635 nm), red-orange (620 nm) and amber (596 nm) LEDs are used and two of them are used each time. Two sine signals with different frequencies are launched by AWGs (Agilent 33250A) and through amplifiers and Bias-Tees, drive two LEDs. The signal analyzer (Agilent N9020A) is used to observe the signal power. The experimental results of channle crosstalk are close to theoretical results. The analysis of channel crosstalk in muliti-channel WDM-VLC system will give some guidance in increasing the number of channels for optical communication in the future.
      通信作者: 唐义, tangyi4510@bit.edu.cn
    • 基金项目: 国家重点基础研究发展计划(批准号: 2013CB329202)和国家自然科学基金项目(批准号: 61571067)资助的课题.
      Corresponding author: Tang Yi, tangyi4510@bit.edu.cn
    • Funds: Project supported by the National Basic Research Program of China (Grant No. 2013CB329202), and the National Natural Science Foundation of China (Grant No. 61571067).
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    Langer K D, Grubor J 2007 Proceedings of IEEE 9th International Conference on Transparent Optical Networks Rome, Italy, July 1-5, 2007 p146

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    Wu Y S, Yang A Y, Feng L H, Sun Y 2013 Chin. Opt. Lett. 11 030601

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    Sewaiwar A, Tiwar S V, Chung Y H 2015 Opt. Exp. 23 13015

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    Zhang Y L, Lan T, Gao M G, Zhao T, Shen Z M 2015 Acta Phys. Sin. 64 164201 (in Chinese) [张逸伦, 蓝天, 高明光, 赵涛, 沈振民 2015 物理学报 64 164201]

    [7]

    Cossu G, Khalid A M, Choudhury P, Corsini R, Ciaramella E 2012 Opt. Exp. 20 B501

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    Wang Y Q, Wang Y G, Chi N, Yu J J, Shang H L 2013 Opt. Exp. 21 1203

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    Wang Y G, Huang X X, Tao L, Shi J Y, Chi N 2015 Opt. Exp. 23 13626

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    Chang C C, Wu C T, Lee K, Woo S, Choi H G 2014 Proceedings of the 9th IEEE Conference on Industrial Electronics and Applications Hangzhou, China, June 9-11, 2014 p2195

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    Schubert E F 2003 Light-Emitting Diodes (Cambridge: Cambridge University Press) p89

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    Wen Y M, Zhao X M, Li P, Wen J, Zhang M 2012 Acta Opt. Sin. 32 0130001 (in Chinese) [文玉梅, 赵学梅, 李平, 文静, 张敏 2012 光学学报 32 0130001]

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    Chhajed S, Xi Y, Gessmann T, Xi J Q, Shah J M, Kim J K, Schubert E F 2005 Proc. SPIE 5739 16

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    Shen H P, Feng H J, Pan J G, Hu H Y 2005 Proceedings of About CIE26th-China Illuminating Engineering Society Annual Meeting Shanghai, China, November 26-27, 2005 p83

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    Keppens A, Ryckaert W R, Deconinck G, Hanselaer P 2010 J. Appl. Phys. 108 043104

    [16]

    Komine T, Nakagawa M 2004 IEEE Trans. Consum. Electr. 50 102

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出版历程
  • 收稿日期:  2015-12-03
  • 修回日期:  2015-12-31
  • 刊出日期:  2016-05-05

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