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The study of power allocation schemes for MIMO visible light communication with lattice layout

The study of power allocation schemes for MIMO visible light...

International Symposium on Optoelectronic Technology and Application 2016(OTA 2016)——Conf.15 Optical Communication and Optical network

作者： Yu Wan-wan Zhang Jian-yong Institute of Light-wave Technology Beijing Jiaotong University Key Lab of All Optical Network & Advanced Telecommunication Network of Ministry of Education of the People’s Republic of China Beijing Jiaotong University

The visible light communication(VLC) use simple intensity modulation and direct detection in general, ignoring the frequency and phase of signal, and lead to the high channel correlation on optical wi

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All-optical correlator based on modal dispersion in multimode fiber

All-optical correlator based on modal dispersion in multimod...

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Asia Communications and Photonics Conference, ACPC 2015

作者： Sun, Jian Tan, Zhongwei Li, Tangjun Wang, Muguang Institute of Lightwave Technology Key Lab of All Optical Network and Advanced Telecommunication Network China

ISBN: (纸本)9781943580064

We propose and demostrate a novel all-optical correlator based on modal dispersion in multimode fiber. The incident optical signal is copied into different modes in a large core high numerical aperture step-index multimode fiber and time delay is introduced by modal dispersion. We use a mask with slits as a space filter to select the modes needed. A correlator of the mask and input signal is achieved at the output end. Thanks to the use of modal dispersion, the correlator is nearly independent of the wavelength and bandwidth of input signal. By adjusting slits on the mask, the target patterns of the correlator can be changed easily. © 2015 OSA.

关键词： Multimode fibers

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Stable single-polarization single-longitudinal-mode linear cavity erbium-doped fiber laser based on structured chirped fiber Bragg grating

Stable single-polarization single-longitudinal-mode linear c...

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作者： Yin, Bin Liu, Zhibo Feng, Suchun Bai, Yunlong Li, Haisu Jian, Shuisheng Institute of Lightwave Technology Key Lab of All Optical Network and Advanced Telecommunication of EMC Beijing Jiaotong University Beijing China

A novel linear cavity erbium-doped fiber (EDF) laser based on a structured chirped fiber Bragg grating (CFBG) filter is proposed for stable single-polarization (SP) single-longitudinal-mode (SLM) operation. For the first time, to the best of our knowledge, a structured CFBG filter with an ultranarrow transmission band which is generated by tapering directly on CFBG is used to select the laser longitudinal mode. The SLM operation is obtained by using the structured CFBG together with an unpumped EDFacting as a saturable absorber. The fluctuations of the laser peak power and center wavelength are less than 0.07 dB and 1 pm in 1 h, respectively. The stable SP operation is achieved by using the inline broadband polarizer. The measured 20 dB laser linewidth is about 27.7 kHz, which indicates the laser linewidth is approximately 1.39 kHz FWHM. © 2014 Optical Society of America.

关键词： Saturable absorbers

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Wideband RCS reduction of slot antenna array by using reflectarrays 6

Wideband RCS reduction of slot antenna array by using reflec...

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6th IEEE International Symposium on Microwave, Antenna, Propagation, and EMC Technologies, MAPE 2015

作者： Han, Yunhao Chen, Meie Wang, Junhong Zhan, Zhang Zheng, Li Key Lab of All Optical Network Advanced Telecommunication Network of MOE Beijing Jiaotong University Beijing China 1nstitute of Lightwave Technology Beijing Jiaotong University Beijing China

ISBN: (纸本)9781467374415

According to the principle of reflectarray, this paper presents a new way which disperses the scattered energy into different directions to reduce the RCS of the slot antenna array, preserving its radiating performance at the same time. Four reflectarrays are designed using double square ring elements of variable size, and they are loaded onto the patch side of the slot antenna array by region. The reflectarrays disperse the scattering field into different directions, which makes a significant reduction of monostatic RCS in a wide frequency band including in-band and out-band. The backward RCS of the slot antenna array with reflectarrays can be reduced as much as 20dBsm compared to that of the conventional antenna array. © 2015 IEEE.

关键词： Antenna arrays

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Single polarization and poling optimized twin-hole optical fiber

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Chinese Optics Letters 2015年第13期13卷 12-14页

作者：黄琳任国斌 Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaoton~ University Beijin~ 100044 China Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

We investigate optimal twin-hole poling optical fiber configurations, including distances between core and each electrode, and poling voltage based on the two-dimensional charge dynamics model. We propose a poled fiber with optimized x^（2） as well as single-polarization property. Small distance between core and anode guarantees the poled fiber with large x^（2） in fiber core and large polarization-dependent loss. A maximum x^（2） in the core region either outside or inside nonlinear layer can be realized by appropriately selecting edge-to-edge distance between core and cathode. The maximum x^（2） in the core region can be even larger by increasing the poling voltage.

关键词： 060.4370 Nonlinear optics, fibers 060.2430 Fibers, single-mode 060.2280 Fiber design and fabrication

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Coherent near-mid-IR supercontinuum generation in highly nonlinear multi-cladding liquid-coe fiber designed for flat normal dispersion

Coherent near-mid-IR supercontinuum generation in highly non...

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European Conference on Lasers and Electro-Optics, CLEO 2015

作者： Wang, C.C. Bache, M. Technical University of Denmark Department of Photonics Engineering Kgs. LyngbyDK-2800 Denmark 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

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Wideband RCS Reduction of Slot Antenna Array by Using Reflectarrays

Wideband RCS Reduction of Slot Antenna Array by Using Reflec...

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The 6th International Symposium on Microwave,Antenna,Propagation,and Electromagnetic Compatibility Technologies(MAPE 2015)

作者： Yunhao Han Meie Chen Junhong Wang Zhan Zhang Zheng Li Key Lab of All Optical Network & Advanced Telecommunication Network of MOE Beijing Jiaotong University Institute of Lightwave Technology Beijing Jiaotong University

According to the principle of reflectarray, this paper presents a new way which disperses the scattered energy into different directions to reduce the RCS of the slot antenna array, preserving its radiating performance at the same time. Four reflectarrays are designed using double square ring elements of variable size, and they are loaded onto the patch side of the slot antenna array by region. The reflectarrays disperse the scattering field into different directions, which makes a significant reduction of monostatic RCS in a wide frequency band including in-band and out-band. The backward RCS of the slot antenna array with reflectarrays can be reduced as much as 20 d Bsm compared to that of the conventional antenna array.

关键词： reflectarray slot antenna array RCS reduction

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Analysis and Measurement of the Displacement Sensor Based on an Up-tapered Mach-Zehnder Interferometer

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Chinese Physics Letters 2014年第3期31卷 65-68页

作者： WEN Xiao-Dong NING Ti-Gang YOU Hai-Dong KANG Ze-Xin LI Jing LI Chao FENG Ting YU Shao-Wei JIAN Wei Key Lab of All Optical Network and Advanced Telecommunication Network of Ministry of Education Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 Science and Information College Qingdao Agricultural University Qingdao 266109

A displacement sensor based on an up-tapered Mach–Zehnder interferometer （MZI） is proposed and demonstrated experimentally. For this purpose, a fiber MZI is fabricated by using a commercial fusion splicer. Then the transmission spectra of the sensors with different middle fiber lengths are measured by bending the MZIs with different movements of the moving stage. The maximum sensitivity of 2.457 nm/mm is achieved while the shifting of the moving stage changes from 3 mm to 3.5 mm. Note that this kind of up-taper configuration is strong in strength, easy to fabricate and low in cost.

关键词： INTERFEROMETERS RESEARCH DETECTORS OPTICAL fibers INTERFEROMETRY PHYSICS research

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Simulation study on an improved frequency-doubled triangular-shaped pulse train generator with reduced harmonic distortion

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Chinese Optics Letters 2014年第12期12卷 13-18页

作者：李晶宁提纲裴丽郑晶晶李月琴袁瑾王一群张婵陈宏尧 Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Institute of Lightwave Technology Beijing Jiaotong University

An approach to reducing the harmonic distortion in frequency-doubled triangular-shaped pulse train generation is proposed. It requires a dual-parallel Mach Zehnder modulator followed by a section of dispersive fiber, as the key component. The basic principle is to make the expression of optical intensity approximately equal to the Fourier expansion of idea triangular-shaped waveform. A detailed expression of the final optical intensity is given by theory and then verified by simulation. It is found that the impact of the undesired harmonic distortion is greatlv reduced.

关键词： Fiber optic sensors Frequency doublers Harmonic analysis Harmonic distortion Light modulators

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Impact of antenna layout on MIMO visible light communication

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Guangdianzi Jiguang/Journal of Optoelectronics Laser 2015年第8期26卷 1492-1497页

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

For multi-input multi-output (MIMO) indoor visible light communication (VLC), this paper analyzes the impact of antenna layout on the system performance by changing the spatial distribution of light-emitting diodes (LEDs) and optical receivers. In this paper, we use a channel model, which is based on Lambertian radiation, to estimate the channel state matrix. The MIMO technique used in the system consists of three well-known aspects, repetition coding (RC), spatial multiplexing (SMP) and spatial modulation (SM). Two types of systems are analyzed in this paper. The first case is a 4×6 system, which uses 4 LEDs at the transmitter side arranged in square layout and 6 detectors at receivers arranged in hexagonal, rectangular and triangular layouts. As shown in the simulation results, the triangular layout gives the best bit error rate (BER) performance for RC at the center of the room. The BER curves of hexagonal and triangular layouts are almost coincident for SMP and SM, which are both better than the BER curve of rectangle layout. If the receiver is not at the center of the room, the hexagonal layout is the best choice. The second case is an 8×8 system with LEDs and photo detectors using octagonal, square layouts respectively. The simulation results show that the system using square layout in the transmitter has better BER performance than that using the octagonal layout. ©, 2015, Board of Optronics Lasers. All right reserved.

关键词： Bit error rate

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