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Chinese Physics B 2011年第5期20卷 73-79页

作者：钟平平张华妮王金东秦晓娟魏正军陈帅刘颂豪 Key Laboratory of Photonic Information Technology of Guangdong Higher Education Institutes SIPSE & LQIT South China Normal University Guangdong Radio & TV University

Three clock synchronization schemes for a quantum key distribution system are compared experimentally through the outdoor fibre and the interaction physical model of the the clock signal and the the quantum signal in the quantum key distribution system is analysed to propose a new synchronization scheme based on time division multiplexing and wavelength division multiplexing technology to reduce quantum bits error rates under some transmission rate conditions, The proposed synchronization scheme can not only completely eliminate noise photons from the bright background light of the the clock signal, but also suppress the fibre nonlinear crosstalk.

关键词： quantum key distribution clock synchronization wavelength division multiplexing timedivision multiplexing

Reference-frame-independent quantum key distribution of wavelength division multiplexing with multiple quantum channels

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Chinese Physics B 2021年第11期30卷 202-206页

作者： Zhongqi Sun Yanxin Han Tianqi Dou Jipeng Wang Zhenhua Li Fen Zhou Yuqing Huang Haiqiang Ma School of Science and State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China

Reference-frame-independent quantum key distribution(RFI-QKD)can allow a quantum key distribution system to obtain the ideal key rate and transmission distance without reference system calibration,which has attracted much ***,we propose an RFI-QKD protocol based on wavelength division multiplexing(WDM)considering finite-key analysis and *** finite-key bound for RFI-QKD with decoy states is derived under the crosstalk of *** resulting secret key rate of RFI-QKD,which is more rigorous,is *** results reveal that the secret key rate of RFI-QKD based on WDM is affected by the multiplexing channel number,as well as crosstalk between adjacent channels.

关键词： quantum key distribution wavelength division multiplexing secret key rate

Phase modulation polarization encoding module applied to one-to-many QKD network based on wavelength division multiplexing

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Chinese Optics Letters 2022年第12期20卷 56-61页

作者： Yi Zhang Xiaojuan Qin Jindong Wang Yafei Yu Zhengjun Wei Zhiming Zhang Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou 510006China Guangdong Polytechnic Institute Guangzhou 510091China

The quantum key distribution(QKD)network is a promising solution for secure *** this paper,we proposed a polarization-independent phase-modulated polarization encoding module,and it can be combined with a dense wavelength division multiplexer(DWDM)to achieve multi-user *** experimentally test the encoding module with a repetition rate of 62.5 MHz,and its average quantum bit error rate(QBER)is as low as 0.4%.Finally,we implement a principle verification test for simultaneous QKD for 1 to 2 users in 100 min,and the average QBER of two users under the transmission distance of 1 km and 5 km is kept below 0.8%.Due to the use of polarization encoding,the module can also realize scalable network architecture in free-space QKD systems in the future.

关键词： quantum key distribution polarization encoding wavelength division multiplexing quantum networks

A Novel Bi-wavelength Method for Accurately Measuring Gain and Noise Characteristics of an Erbium-Doped Fibre Amplifier for Multi-Channel wavelength division multiplexing Transmission

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Chinese Physics Letters 2003年第10期20卷 1777-1780页

作者：刘艳格蒙红云袁树忠田建国开桂云董孝义 InstituteofPhysics NankaiUniversityTianjin300071 InstituteofModernOptics NankaiUniversityTianjin300071

Gain and noise figure (NF) are the most important two parameters of an erbium-doped fibre amplifier (EDFA) for a multi-channel wavelength division multiplexing (WDM) transmission system. A simple bi-wavelength method for accurate gain and NF spectrum measurement of EDFA for WDM applications is proposed. A saturating input signal, whose power equals to the sum of all the WDM signal power and whose wavelength is determined by the channel numbers and the wavelength of the WDM input signals, saturates the EDFA in a degree as the same as the WDM signals input. Meanwhile, a small power probe signal scans and measures the gain and the NF value at every wavelength of the WDM input signals. Investigative results by numerical simulation show that the gain and the NF spectra measured by this method have good agreement with the real spectra of the WDM signal input in a large total input power range. The maximum errors of the gain and the NF are less than 0.2 dB and 0.16 dB, respectively, for a 50-channel input case. The method is competent for the accurate gain and the NF spectrum measurement of the fibre preamplifier and the line-amplifier for WDM applications and has the advantages of simplicity, convenience and easy implement.

关键词： Channel numbers noise characteristics Transmission systems maximum error ENTERING Gain wavelength division multiplexing wavelengths

Analysis of Doppler-effect on satellite constellations with wavelength division multiplexing architectures

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Chinese Optics Letters 2009年第1期7卷 19-22页

作者：杨清龙谭立英马晶 Laboratory of Tunable Laser Technology Harbin Institute of Technology

With the development of optical space communications, a global space-based optical backbone network is currently proposed by using broadband laser inter-satellite links （ISLs） which enable routing traffic through the space. Satellite optical networking techniques based on wavelength division multiplexing （WDM） ISLs can transit significantly high data rates signals. In this letter, a new function of wavelength excursion due to Doppler-effect is developed for the ISLs, considering the conception of pointing ahead mechanism. The characteristic of wavelength excursion induced by Doppler-effect is examined in one of low earth orbit （LEO） satellite constellation networks named the next-generation LEO system （NeLS） with WDM ISLs assumed, and the influence on its communications caused by wavelength excursion is analyzed.

关键词： Fiber optic networks multiplexing multiplexing equipment Orbits Satellites wavelength division multiplexing

Technical study of visible light wavelength division multiplexing using polymer optical fiber

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Chinese Optics Letters 2005年第10期3卷 577-578页

作者：张永生马辉张涛王茁王东郑荣升杨海鹏明海 Department of Physics University of Science and Technology of China Hefei 230026

Visible light wavelength division multiplexing （VWDM） experiment was performed using polymer optical fiber （POF）. Lights of two different wavelengths （650 and 530 nm） were sent to a single POF. Red light （650 nm） was used for 100-Mb/s full duplex IP data transmission and green light （530 nm） was used for voice signal transmission. Light sources are light-emitting diodes （LEDs）. A POF coupler （splitter） and the prisms were employed as multiplexer and demultiplexer, respectively. The channel isolation and insert loss were measured, which are 20.5 and 17.65 dB for 650-nm channel respectively, and 19.16 and 20.55 dB for 530 nm one respectively.

关键词： Communication channels (information theory) Data transfer Light Light emitting diodes Light sources Polymers Signal processing wavelength division multiplexing

Performance of phase-matching quantum key distribution based on wavelength division multiplexing technology

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Chinese Physics B 2023年第2期32卷 103-107页

作者：马海强韩雁鑫窦天琦李鹏云 School of Science and State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China China Telecom Research Institute Beijing 102209China China Academy of Electronics and Information Technology China Electronic Technology Group CorporationBeijing 100041China

Quantum key distribution(QKD) generates information-theoretical secure keys between two parties based on the physical laws of quantum mechanics. The phase-matching(PM) QKD protocol allows the key rate to break the quantum channel secret key capacity limit without quantum repeaters, and the security of the protocol is demonstrated by using equivalent entanglement. In this paper, the wavelength division multiplexing(WDM) technique is applied to the PM-QKD protocol considering the effect of crosstalk noise on the secret key rate. The performance of PM-QKD protocol based on WDM with the influence of adjacent classical channels and Raman scattering is analyzed by numerical simulations to maximize the total secret key rate of the QKD, providing a reference for future implementations of QKD based on WDM techniques.

关键词： quantum key distribution wavelength division multiplexing secret key rate

Silicon-Based Mode Converter and Demultiplexer for wavelength division multiplexing Transmission by Using Multimode Interference Couplers

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Optics and Photonics Journal 2020年第6期10卷 117-124页

作者： Yong Zhou Junqiang Sun National Laboratory for Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan China

We present a mode converter and demultiplexer structure for wavelength division multiplexing (WDM) transmission by employing multimode interference (MMI) on Silicon-on-Insulator (SOI) platform. The mode converter and demultiplexer have a compact size of less than 2.7 μm × 43.7 μm. Moreover, the crosstalk between neighboring wavelength channel within C band (1530 nm to 1570 nm) can be reduced by utilizing the tapered phase shifter cascaded with MMI. The simulated results indicate that this structure has a low insertion loss of less than 1 dB, a low crosstalk of better than ?15 dB and a relatively high fabrication tolerance of ~10 nm. Such structure may find many potential applications in silicon photonic integrated devices.

关键词： Multimode Interference wavelength division multiplexing Mode Converter Silicon-on-Insulator

Exploiting the Faster-Than-Nyquist Concept in wavelength-division multiplexing Systems Using Duobinary Shaping

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ZTE Communications 2012年第1期10卷 23-29页

作者： Ekawit Tipsuwannakul Magnus Karlsson Peter A. Andrekson Photonics Laboratory Dept. of Microtechnology and Nanoscience Chalmers University of Technology

This paper begins with Nyquist wavelengthdivision multiplexing （WDM） and then introduces fasterthanNyquist. In fasterthanNyquist a certain amount of intersymbol interference （ISI） is accepted, which violates the fundamental principle of Nyquist WDM. This results in muchrelaxed transceiver bandwidth and simpler spectral design. However, in fasterthanNyquist, implementation complexity is shifted from the transmitter side to the receiver side. Therefore, successful application of fasterthanNyquist depends on innovation in the receiver structure. In this paper, we discuss the guidelines for implementing suboptimum, lowcomplexity receivers based on fasterthanNyquist. We suggest that duobinary shaping is a good technique for trading off achievable spectral efficiency, detection performance, and implementation complexity and might be preferable to Nyquist WDM. Experiments are conducted to verify robustness of the proposed technique.

关键词： coherent detection digital signal processing optical fiber communications spectralefficiency wavelength division multiplexing

Photonic crystal-connected bidirectional micro-ring resonator array for duplex mode and wavelength channel(de) multiplexing

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Photonics Research 2024年第8期12卷 1802-1812页

作者： ZHIWEI GUAN CHAOFENG WANG CHUANGXIN XIE HAISHENG WU JUNMIN LIU HUAPENG YE DIANYUAN FAN JIANGNAN XIAO SHUQING CHEN International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology Institute of Microscale OptoelectronicsShenzhen University College of Physics and Engineering Technology Minzu Normal University of Xingyi College of New Materials and New Energies Shenzhen Technology University Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal University Terahertz Technology Innovation Research Institute Shanghai Key Laboratory of Modern Optical SystemTerahertz Science Cooperative Innovation CenterSchool of Optical-Electrical Computer EngineeringUniversity of Shanghai for Science and Technology

The progress of on-chip optical communication relies on integrated multi-dimensional mode（de）multiplexers to enhance communication capacity and establish comprehensive networks. However, existing multi-dimensional（de）multiplexers, involving modes and wavelengths, face limitations due to their reliance on single-directional total internal reflection and multi-level mode conversion based on directional coupling principles. These constraints restrict their potential for full-duplex functionality and highly integrated communication. We solve these problems by introducing a photonic-like crystal-connected bidirectional micro-ring resonator array（PBMRA）and apply it to duplex mode-wavelength multiplexing communication. The directional independence of total internal reflection and the cumulative effect of the subwavelength-scale pillar within the single-level photonic crystal enable bidirectional mode and wavelength multiplexed signals to transmit among multi-pair nodes without interference, improving on-chip integration in single-level mode conversion. As a proof of concept, we fabricated a nine-channel bidirectional multi-dimensional（de）multiplexer, featuring three wavelengths and three TE modes, compactly housed within a footprint of 80 μm × 80 μm, which efficiently transmits QPSK-OFDM signals at a rate of 216 Gbit/s, achieving a bit error rate lower than 10-4. Leveraging the co-ring transmission characteristic and the orthogonality of the mode-wavelength channel, this（de）multiplexer also enables a doubling of communication capacity using two physical transmission channels.

关键词： Mode conversion Mode division multiplexing Optical networks Phase modulation Total internal reflection wavelength division multiplexing