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Research of antenna layouts in multiple-input multiple-output visible light communication

Guangdianzi Jiguang/Journal of Optoelectronics Laser 2015年第10期26卷 1908-1915页

作者： Hu, Shu-Tong Zhang, Jian-Yong Institute of Lightwave Technology Beijing Jiaotong University Beijing China Key Lab of All Optical Network & Advanced Telecommunication Network of Ministry of Education of the People's Republic of China Beijing Jiaotong University Beijing China

This paper analyzes the performance of various indoor visible light communication (VLC) systems with different channel matrix H of various parameters, such as the distance between light emitting diodes (LEDs) dTX, the height between the transmitters plane and receivers plane h, and different antenna layouts by changing the spatial distribution of LEDs and photo-detectors (PDs). Based on the simulation results, the key factors, which are critical to the performance of VLC systems, consist of the minimum Euclidean distance dminand the determinant Det(H). According to these key factors, the antenna layouts are divided into two categories, namely the circular layout and lattice layout. As shown in the simulation results, if dTXis variable and h is fixed, Det(H) is critical to the bit error rate (BER) of the system with a circular layout, while dminand Det(H) are critical to the BER of a system with a lattice layout. Moreover, dminis the critical factor if dTXis within a certain range. If h is variable and dTXis fixed, Det(H) is the critical factor for the system performance. ©, 2015, Board of Optronics Lasers. All right reserved.

关键词： Visible light communication

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Evolution of two-dimensional electric field in poled twin-hole optical fiber

Evolution of two-dimensional electric field in poled twin-ho...

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Fiber-Based Technologies and Applications, FBTA 2014

作者： Huang, Lin Ren, Guobin Sun, Xiaomeng Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing100044 China Institute of Lightwave Technology Beijing Jiaotong University Beijing100044 China

A two-dimensional multi-charge dynamics model is proposed in this paper to investigate the time evolution of electric field distribution during thermal poling in twin-hole optical fiber. The model is validated by comp... 详细信息

ISBN: (纸本)1557522774

关键词： Electric fields

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Universal dispersion relation for plasmon modes in graphene-coated nanowire

Universal dispersion relation for plasmon modes in graphene-...

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Asia Communications and Photonics Conference, ACPC 2014

作者： Gao, Yixiao Ren, Guobin Zhu, Bofeng Lin, Huang Jian, Shuisheng Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing100044 China Institute of Lightwave Technology Beijing Jiaotong University Beijing100044 China

A universal scaling law to describe dispersion relation of plasmon modes in graphenecoated nanowire (GNW) is presented, which could be applied to obtain the dispersion relation of GNW with any radius without further e... 详细信息

ISBN: (纸本)9781557528520

关键词： Nanowires

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Optimization of thermal poling in double-anode optical fiber

Optimization of thermal poling in double-anode optical fiber

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Asia Communications and Photonics Conference, ACPC 2014

作者： Huang, Lin Ren, Guobin Zhang, Yan Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing100044 China Institute of Lightwave Technology Beijing Jiaotong University Beijing100044 China

We present a theoretical investigation on thermal poling of double-anode optical fiber. It is found that an optimized asymmetrical double-anode provides larger χ(2), while the symmetrical configuration lead to zero ... 详细信息

ISBN: (纸本)9781557528520

关键词： Anodes

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Refractive index sensing characterization of a singlemode-claddingless- singlemode fiber structure based fiber ring cavity laser

Refractive index sensing characterization of a singlemode-cl...

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作者： Liu, Zhi-Bo Tan, Zhongwei Yin, Bin Bai, Yunlong Jian, Shuisheng Key Lab. of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

This paper firstly demonstrated the refractive index (RI) characteristics of a singlemode-claddingless-singlemode fiber structure filter based fiber ring cavity laser sensing system. The experiment shows that the lasing wavelength shifts to red side with the ambient RI increase. Linear and parabolic fitting are both done to the measurements. The linear fitting result shows a good linearity for applications in some areas with the determination coefficient of 0.993. And a sensitivity of ∼131.64nm/RIU is experimentally achieved with the aqueous solution RI ranging from 1.333 to 1.3707, which is competitively compared to other existing fiber-optic sensors. While the 2 order polynomial fitting function, which determination relationship is higher than 0.999, can be used to some more rigorous monitoring. The proposed fiber laser has a SNR of ∼50dB, and 3dB bandwidth ∼0.03nm. © 2014 Optical Society of America.

关键词： Refractive index

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Mapping Design of a Four-Dimensional 32-ary Signal Constellation over an AWGN Channel

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China Communications 2014年第7期11卷 64-73页

作者： ZHANG Jianyong Ivan B. Djordjevic Key Lab of Alloptical Network & Advanced Telecommunication Network ofEMC Beijing Jiaotong University Beijing 100044 P.R. China University of Arizona Tucson AZ 85721 USA Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 P.R. China

In the bit-interleaved coded modulation with iterative decoding,it is desired that any two Hamming neighbors,i.e..signal constellation points whose binary labels are at unit Hamming distance,be separated by a large Euclidean *** paper determines the mappings for the 32-ary fourdimensional generalized cross constellation（32-4D-GCC） so that the minimum squared Euclidean distance d_（min）~2 between Hamming neighbors is *** such mappings,those with minimum multiplicity N（d_（min）~2） are *** reduce the large search space,a set of ＂mapping templates,＂ each producing a collection of mappings with the same set partitions of binary labels,is *** enumeration of mapping templates,it is shown that the optimum d_（min）~2=16and the optimum N（d_（min）~2）=*** thousands optimum mappings found by computer search,two of the best performance are presented.

关键词： AWGN BICM-ID signalmapping hamming cube mapping template

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Erratum to: “A full-duplex WDM-RoF system based on tunable optical frequency comb generator” [Opt. Commun. 344C (2015) 65–70]

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Optics Communications 2015年 355卷 613-613页

作者： Chan Zhang TiGang Ning Jing Li Li Pei Chao Li Shaoshuo Ma Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

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Optical devices based on multilayer optical waveguide

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Frontiers of Optoelectronics 2013年第2期6卷 146-152页

作者： Sijun WENG, Li PEI Li PEI Ruifeng ZHAO Junjie YANG Yiqun WANG Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China

Optical waveguide is used to guide the transmission of light. This paper reviews multilayer optical waveguide and some devices based on it. The optical waveguide can be divided into single-layer and multilayer optical waveguides in general. Here, multilayer cylindrical waveguide and multilayer planar waveguides were mainly focused. The analyzing method and the structures of waveguides were also demonstrated in briefly. Both these multilayer optical waveguide used in different kinds of optical devices including optical modulator, laser, optical amplifier, optical switch and special fiber were further presented. At last, the principle and structure of these multilayer optical devices were compared.

关键词： multilayer waveguide optical devices multi- layer structure

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A refractive index sensor based on single-mode no-core single-mode fiber structure

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Guangdianzi Jiguang/Journal of Optoelectronics Laser 2013年第7期24卷 1279-1285页

作者： Li, Yang Liu, Yan Liu, Zhi-Bo Jian, Shui-Sheng Key Lab. of All Optical Network and Advanced Telecommunication Network of EMC Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

A refractive index sensor based on single-mode no-core single-mode fiber structure is proposed and experimentally demonstrated. When the difference between surrounding refractive index (SRI) and the refractive index of no-core fiber (NCF) is relatively small, the NCF can be treated as a weakly guiding multimode fiber with step-index profile, consttructing the traditional single-mode multimode single-mode (SMS) fiber structure. Under the weakly guiding condition, the mode excitation and the output characteristics of this sensor are analyzed by using linear polarization mode approximation method. And numerical calculations are carried out based on the theoretical analysis. Numerical simulations show that the characteristic wavelength in the output spectrum will shift as the SRI changes, which reflects the refractive index sensing capability of this fiber structure. For verifying testify the conclusion of the numerical simulation, several experiments have been carried out. As the SRI increases, the characteristic wavelength shows blue shift correspondingly, which agrees well with the numerical simulation and the theoretical anticipation. The sensitivity of this sensor obtained from experiments reaches 205.42 nm/RIU for a refractive index range from 1.3 to *** a further confirmatory experiment for testing the absolute ethylalcohol in room temperature indicates that such a refractive index sensor's relative error is 0.1%.

关键词： Refractive index

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Modified jammed-array wideband sawtooth filter

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Guangdianzi Jiguang/Journal of Optoelectronics Laser 2013年第10期24卷 1855-1861页

作者： Tan, Zhong-Wei Zhao, Feng Li, Rui He, Fei Key Lab. of All Optical Network and Advanced Telecommunication Network of EMC Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

Jammed-array wideband sawtooth (JAWS) filter has periodic multi-channel sawtooth spectrum. Due to the complex spectral components, it's difficult to make a passive multi-channel sawtooth filter. In this article, we present a modified JAWS filter with low loss. It only consists of four elements, including a fiber collimator, two lenses and a virtually-imaged phased array (VIPA). The beam transmitted through the VIPA is collected by a lens and a large area photodetector rather than a mirror is used to reflect the beam back into the fiber. The extra insertion loss is lower than 6 dB and the performance of the filter is much better than that of the JAWS filter with beam reflected by a mirror. The main characteristics of the jammed-array wideband sawtooth filter based on a virtually-imaged phased array are studied systematically. The main parameters, such as linearity, duty cycle and signal-to-noise ratio, are optimized by numerical simulation and tested by the experiment. Since the free spectrum range of the filter is decided by the thickness of VIPA, the optimization of VIPA with different thicknesses is also discussed. The filter might be used in fast sensitive interrogation of concatenated multi-channel fiber Bragg grating sensors and ultra-high-frequency electrical sawtooth waveform generation.

关键词： Fiber Bragg gratings

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