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Bidirectional radio-over-fiber systems with SSB modulation and wavelength reuse based on injection-locked semiconductor lasers

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Chinese Optics Letters 2010年第11期8卷 1040-1042页

作者：洪成张诚段俊胡薇薇徐安士陈章渊 state key laboratory of advanced optical communication systems and networks Peking University

A 60-GHz bidirectional radio-over-fiber （RoF） system using two-carrier-injected distributed feedback （DFB） laser is proposed and demonstrated to realize optical single sideband （SSB） modulation for *** injection-locked Fabry-P＇erot laser is also carried out to realize wavelength reuse in *** of 2.5 Gb/s on a 60-GHz carrier for downlink and 622-Mb/s baseband signal for uplink are both successfully demonstrated over 50-km single mode fiber without chromatic dispersion compensation.

关键词： Electromagnetic dispersion Feedback Lasers Single mode fibers

Design of Raman-parametric fiber amplifier for wavelength division multiplex transmission system

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Chinese Optics Letters 2008年第5期6卷 327-330页

作者：江晓弘姜淳章晓鸣 state key laboratory of advanced optical communication systems and networks Shanghai Jiao Tong University

We optimize the novel configuration of a hybrid fiber amplifier - Raman assisted-fiber-based optical parametric amplifier （R-FOPA）, in which the parametric gain and Raman gain profiles are combined to achieve a flat composite gain profile. The pump powers and the fiber length in the hybrid amplifier are effectively optimized by genetic algorithm （GA） scheme. The optimization results indicate that the RFOPA can achieve a 200-nm flat bandwidth spectrum with the gain of 20 dB and ripple of less than 4 dB.

关键词： Computer networks Electric power transmission Fiber amplifiers Fiber optics Genetic algorithms Light amplifiers Microwave amplifiers Multiplexing Optimization Parametric amplifiers Parametric devices

Light Localization in Slot Photonic Crystal Waveguide

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Chinese Physics Letters 2009年第1期26卷 126-129页

作者：武隽彭超李艳萍王子宇 state key laboratory on advanced optical communication systems and networks Peking University Beijing 100871

A single-mode photonic crystal waveguide with a linear tapered slot is presented, which can localize light spatially by changing the slot width. Its effective bandwidth is 52nm, from 1500nm to 1552nm. Along the tapered structure, the slot width is reduced, and the corresponding band curve shifts. The group velocity of light becomes zero at the band edge. Therefore, different frequency components of the guided light are slowed down and finally localized at correspondingly different widths inside a tapered slot photonic crystal waveguide. Furthermore, this structure can confine light wave in a narrow slot waveguide, which may effectively enhance the interaction between light and the low-index wave-guiding materials filled in the slot.

关键词： field emission molybdenum dioxide enhancement factor

Improved optical packet switching structure with recirculation buffer and feedback tunable wavelength converter

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Chinese Optics Letters 2009年第5期7卷 384-386页

作者：武程肖石林 state key laboratory of advanced optical communication systems and networks Shanghai Jiao Tong University

The performance of an optical switching network is mainly determined by its core node structure. An improved optical packet switching （OPS） node structure based on recirculation optical fiber delay line （FDL） and feedback tunable wavelength converter （TWC）, and a specific scheduling algorithm for the node structure are presented. This switching structure supports both point-to-point and point-to-multi- points broadcasting transmission with superior capacity expansion performance. Its superiority in packet loss probability is proved by simulation.

关键词： Feedback optical fibers optical switches Packet switching Switching systems

Distribution of millimeter waves over a fiber link with high frequency stability(Invited Paper)

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Chinese Optics Letters 2016年第12期14卷 21-24页

作者：董毅刘张唯一王小成邓楠谢玮霖胡卫生 state key laboratory of advanced optical communication systems and networks Shanghai Jiao Tong University

We present a theoretical analysis, systematic simulation, and experimental measurements for the phase noise,timing jitter, and frequency stability in the frequency distribution of millimeter waves over distant optical fiber links. The conception that the dissemination of a higher frequency reference instead of a lower one can achieve a better frequency stability is discussed and verified. We find that the system＇s noise floor, including thermal noise,shot noise, and any other noise from electronic components, is considered to be a fundamental limitation for a frequency reference transmission system. Benefiting from the high-precision time delay variation discrimination and accurate locking control operation, a highly stabilized reference is distributed to a remote end over a 60 km spooled fiber, achieving a frequency stability of 4 × 10^（-17） at an average time 1000 s, corresponding to 23 fs of RMS timing jitter（0.01 Hz^（–1） MHz）.

关键词： millimeter jitter dissemination discrimination links conception locking distant instead verified

All-optical amplitude-shift keying and differential phase-shift keying to differential phase amplitude-shift keying format combination in highly nonlinear fiber

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Chinese Optics Letters 2009年第7期7卷 564-567页

作者：吴琳张德朝张帆陈章渊徐安士 state key laboratory of advanced optical communication systems and networks Electronics Department Peking University

We propose an all-optical modulation formats combination scheme that merges an amplitude-shift keying （ASK） signal and a differential phase-shift keying （DPSK） signal into a single differential phase amplitude- shift keying （DPASK） signal based on parametric amplification in a highly nonlinear fiber. By optimizing the power of the ASK channel, formats combination of ASK and DPSK to DPASK signal is successfully demonstrated by computational simulation. The demodulation process of the generated DPASK pulses is investigated and the relationship between optical signal-to-noise ratio （OSNR） penalty and the input ASK power is presented. The proposed scheme may be used for increasing spectral efficiency and all-optical logic device.

关键词： Amplification Light modulation Logic devices optical devices Phase shift Phase shift keying Signal to noise ratio Spectrum analyzers

Joint optimizing of interleaving and LDPC decoding for burst errors in PON systems

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Science China(Information Sciences) 2020年第2期63卷 233-235页

作者： Lei ZHANG Chuanchuan YANG Fan ZHANG state key laboratory of advanced optical communication systems and networks Peking University

Dear editor,Driven by the continuously increasing demand for large capacity data services, the upgrade for high speed passive optical network (PON) system is of great importance. To meet the stringent optical power bu... 详细信息

关键词： PON Joint optimizing of interleaving and LDPC decoding for burst errors in PON systems

A 300-MHz Bandwidth Balanced Homodyne Detector for Continuous Variable Quantum key Distribution

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Chinese Physics Letters 2013年第11期30卷 117-119页

作者： HUANG Duan FANG Jian WANG Chao HUANG Peng ZENG Gui-Hua state key laboratory of advanced optical communication systems and networks Shanghai Jiaotong UniversityShanghai 200240

In Gaussian-modulated coherent-state quantum key distribution,the measurement of quadratures of coherent states is performed by using a homodyne ***,conventional detectors usually suffer from narrow *** present a method to design a high-speed shot-noise-limited balanced homodyne detector.A 300-MHz bandwidth detector is experimentally tested and the level of shot noise is 14 dB higher than the electronic *** results show that a detector with this method is potential to design a GHz bandwidth detector for continuous variable quantum key distribution at a low level of ratio of shot noise to electronic noise.

关键词： coherent quantum narrow

Thulium-Doped Fiber Amplifier for Blue Light Signal Amplification

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China communications 2019年第5期16卷 181-188页

作者： Muhammad Hanif Ahmed Khan Khushik Chun Jiang state key laboratory of advanced optical communication systems and networks Shanghai Jiao Tong University

Fluoride-based thulium-doped visible light fiber amplifier(TmVLFA), which can be used to amplify the blue light signal for a visible light communication(VLC) system,is theoretically demonstrated for the first time according to the best of our knowledge. The transition rate equations and power propagation equations are solved to predict the dependence of the gain and noise figure on fiber parameters. The numerical results show that with the pump wavelength 1150 nm and pump power 800 mW, 2.75 m long thulium-doped fiber can amplify blue light(480 nm) signal up to 33.3 dB, and the noise figure is in the range from 3.0 to 3.5 dB. The model and numerical results encourage the use of fiber amplifier in VLC system for blue light amplification to extend the range of VLC.

关键词： Tm-doped visible light fiber amplifier visible light communication fiber amplifier gain noise figure