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Science China(Information Sciences) 2013年第10期56卷 134-143页

作者： SHEN Xi XU Kun SUN XiaoQiang WU Jian lin jintong State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications

An innovative dynamically reconfgurable radio-over-fber(RoF)network equipped with an intelligent medium access control(MAC)protocol is proposed to provide broadband access to train passengers in railway high-speed mobile *** proposed RoF network architecture is based on a reconfgurable control station and remote access unit(RAU)that is equipped with a fxed flter and tunable *** proposed hybrid frequency-division multiplexing/time division multiple access(FDM/TDMA)based MAC protocol realizes failure detection/recovery and dynamic wavelength allocation to remote access *** result shows that with the proposed MAC protocol,the control station can detect failures and recover and dynamic wavelength allocation can increase the wavelength resource utilization to maintain network performance.

关键词： radio over fber medium access control protocol wavelength allocation failure detection failure recovery

Broadband photonic radio frequency(RF) channelization based on coherent optical frequency combs and polarization I/Q demodulation

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Science China Technological Sciences 2013年第3期56卷 621-628页

作者： DAI YiTang XU Kun XIE XiaoJun YAN Li WANG RuiXin lin jintong Beijing University of Posts and Telecommunications State Key Laboratory of Information Photonics and Optical CommunicationsP.O.Box 55(BUPT)

In this work,we analyze and demonstrate a novel photonic-assisted broadband and high-resolution radio frequency(RF) channelization scheme based on dual coherent optical frequency combs(OFCs),regular optical de-muxes,and polarization I/Q demodulators in theory and *** use of two coherent combs avoids precise optical alignment,and a numerical filter in digital signal processor(DSP) enables an ideal rectangular frequency response in each channel without any ultra-narrow optical ***,due to the use of polarization I/Q demodulation,ambiguous frequency estimate in direct detection can be avoided and the amplitude,phase mismatch in traditional I/Q demodulation can be *** experiment,we use two coherent OFCs with the free spectrum range(FSR) of about 40 GHz to demonstrate the channelization scheme with seven channels,500 MHz channel spacing and frequency coverage from 3.75 GHz to 7.25 *** input RF tones are accurately down-converted to an intermediate frequency(IF) with a maximum frequency error of 110 ***,crosstalk and spurious free dynamic range(SFDR) of the scheme are also discussed.

关键词： optical frequency comb polarization I/Q demodulation microwave photonic radio frequency(RF) signal processing

Microwave photonics: radio-over-fiber links, systems, and applications [Invited]

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Photonics Research 2014年第4期2卷 54-63页

作者： Kun Xu Ruixin Wang Yitang Dai Feifei Yin Jianqiang Li Yuefeng Ji jintong lin State Key Laboratory of Information Photonics&Optical Communications(Beijing University of Posts and Telecommunications) P.O.Box 55(BUPT)Beijing 100876China

Microwave photonics(MWPs)uses the strength of photonic techniques to generate,process,control,and distribute microwave signals,combining the advantages of microwaves and *** one of the main topics of MWP,radio-over-fiber(RoF)links can provide features that are very difficult or even impossible to achieve with traditional ***,a considerable number of signal-processing subsystems have been carried out in the field of MWP as they are instrumental for the implementation of many ***,there are still several challenges in strengthening the performance of the technology to support systems and applications with more complex structures,multiple functionality,larger bandwidth,and larger processing *** this paper,we identify some of the notable challenges in MWP and review our recent *** and future direction of research are also discussed.

关键词： fiber Microwave microwave

A Review on Fiber Lasers

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China Communications 2012年第8期9卷 1-15页

作者： lin jintong Lu Dan Dai Yitang Beijing University of Posts and Telecommunications Beijing 100876 P. R. China Institute of Semiconductors Chinese Academy of Science Beijing 100083 P. R. China

After a half century of development, fiber laser has evolved from a concept to a great family penetrating into various fields of applications. This paper reviews the history and current development of fiber lasers, with topics covering both continuous wave and short pulse fiber lasers. Important issues such as the major rare earth dopants, fiber laser brightness, polarization effects, clad pumping technology, beam combination, mode locking and pulse shaping are discussed in this paper.

关键词： fiber laser rare earth doped fiber continuous wave fiber laser ultra-short pulse fiber laser

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Integrated LOBS/GMPLS Network Testbed

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China Communications 2010年第3期7卷 11-23页

作者： Wu Jian Hong Xiaobin Guo Hongxiang Zhang Wenjia Liu Lei Takehiro Tsuritani Tomohiro Otani Masatoshi Suzuki lin jintong Key Laboratory of Information Photonics and Optical Communications （Ministry of Education） Beijing University of Posts and Telecommunications Beijing 100876 P. R. China KDDI R＆D Laboratories Inc. 2-1-15 Ohara Fujimino-shi Saitama 356-8502 Japan

In the context of dynamic telecommunication traffic requirement, experimental prototypes and testbeds have been vital and challenging steps towards achieving practical OBS networks. This paper presents the novel integrated LOBS/GMPLS network testbed. Dynamic interworking technologies between GMPLS network and LOBS network and potential survivability schemes in this multilayer network are investigated by experimentally evaluating the TCP and popular streaming media service performance over an integrated LOBS/ GMPLS testbed.

关键词： LOBS GMPLS testbed

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High Speed Demultiplexer Based on a Three-Wavelength SLA

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Chinese Journal of Lasers 1999年第2期8卷 2-7页

作者： HONG Xiaobin lin jintong (Beijing University of Posts and Telecommunications, Beijing 100876, China) 北京邮电大学北京 100876 北京邮电大学北京

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｏｒｄｅｒｔｏｍｅｔｔｈｅｈｉｇｈｂａｎｄｗｉｄｔｈｒｅｑｕｉｒｅｍｅｎｔｉｎｏｐｔｉｃａｌｔｉｍｅｄｉｖｉｓｉｏｎｍｕｌｔｉｐｌｅｘ（ＯＴＤＭ）ｔｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓｙ... 详细信息

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｏｒｄｅｒｔｏｍｅｔｔｈｅｈｉｇｈｂａｎｄｗｉｄｔｈｒｅｑｕｉｒｅｍｅｎｔｉｎｏｐｔｉｃａｌｔｉｍｅｄｉｖｉｓｉｏｎｍｕｌｔｉｐｌｅｘ（ＯＴＤＭ）ｔｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓｙｓｔｅｍｓ，ｔｈｅｓｉｇｎａｌｍｕ...

关键词： semiconductor laser amplifier optical time division multiplexing demultiplexer

Dual-Wavelength linearization of Radio-over-Fiber link for Broadband Access and Ubiquitous Sensing

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China Communications 2012年第1期9卷 20-24页

作者： Wu Zhongle Lv Qiang Dai Yitang lin jintong State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876P.R China

Radio-over-Fiber （RoF） technologies have been considered to be a promising solution to broadband access and ubiquitous sensing. We present a novel approach using dual-wavelength lights to suppress the nonlinear intermodulation distortion in intensity-modulated RoF link both theoretically and experimentally. The system we proposed rminly consists of two Laser Diodes （LDs） at different wavelengths, a commercial available Mach-Zehnder Modulator （MZM） and a Photo Detector （PD）. More than 25 dB suppression of the Third-order Interrnodulation Distortion （IMD3） is achieved by adjusting the wavelength and opti- cal power of the laser. Besides, the output of the MZM is then sent to the photodetector via a single fiber, which simplifies the system complexity for distrbution of RF signals over long distances.

关键词： RoF optical linearization IMD3 intensity modulator

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Generation of 40 GHz phase stable optical short pulses using intensity modulator and two cascaded phase modulators

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Frontiers of Optoelectronics 2011年第3期4卷 292-297页

作者： Yu JI Yan LI Wei LI Xiaobing HONG Hongxiang GUO Yong ZUO Kun XU Jian WU jintong lin State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications

Pulse sources based on lithium niobate modulators are very attractive for optical time division multiplexing(OTDM) transmission systems because the modulators are now commercially available, qualified for system use, and can operate up to very high speeds and over a wide wavelength range. In this paper, we describe the principles of operation and performance of the pulse source based on lithium niobate modulators. The pulse source is based on a Mach-Zehnder intensity modulator(IM) and two phase modulators(PMs). The continuouswave(CW) light is modulated in an IM and then strongly phase modulated in two cascaded PMs. The chirped pulses are subsequently compressed to desired width using dispersion compensation technology. This method has the advantage of acquiring larger chirp using normal PM rather than that special designed PM of very low Vπ. It can also generate shorter pulses than conventional methods incorporating only one PM driving by a radio frequency(RF) signal with the power larger than 1 W which may damage the device. Generation of 40 GHz optical pulses shorter than 2 ps is theoretically illustrated, simulated and experimentally verified. Experimental results show that 40 GHz phase stable optical pulses with pulse-width of 1.88 ps, extinction ratio(ER) larger than 20 dB, the timing jitter of 57 fs and signal-to-noise ratio(SNR) of 32.8 d B can be achieved. This is also a cavity-less pulse source whose timing jitter is determined only by the RF source rather than by the actively controlled cavity. In the experiment, the phase noise of the RF source we used is as low as – 98.13 dBc/Hz at a 10 kHz offset frequency which resulting very low timing jitter of generated *** pulses are then modulated at 40 Gbaud/s with an inphase/quadrature(I/Q) modulator and multiplexed to 160 Gbaud/s with less interference between each *** back-to-back demultiplexing by an electro-absorption modulator(EAM) to 40 Gbaud/s and demodulation by a delay interferometer(DI),

关键词： short pulse intensity modulator phase modulator pulse compression phase stable differential quadrature phase shift keying (DQPSK)

Heterodyne mixing and polarization diversity techniques in radio over fiber system with high sensitivity and dispersion tolerance

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Science China(Information Sciences) 2011年第2期54卷 236-243页

作者： XU Kun, YIN Jie, NIU Jian, SUN XiaoQiang, WU Jian & lin jintong Key Laboratory of Information Photonics and Optical Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China Key Laboratory of Information Photonics and Optical Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing China

We propose and experimentally demonstrate the heterodyne mixing and polarization diversity tech- niques in radio over fiber (ROF) systems with the advantages of high sensitivity and dispersion endurance. The generation of 2.5 Gb/s optical DPSK and PSK signals, fiber propagation and wireless transmission over 15 GHz subcarrier are illustrated with very low sensitivity of -26 and -32 dBm, respectively. Moreover, based on the wireless polarization diversity techniques, we successfully performed the transmission of 1.3 Gb/s uncompressed high definition television (HDTV) signals with high quality.

关键词： radio over fiber heterodyne mixing polarization diversity

Multi-function Device Based on Two Terahertz Optical Asymmetric Demutiplexers

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Chinese Journal of Lasers 1999年第5期8卷 3-5页

作者： HONG Xiaobin lin jintong(Optical Communication R & D Center, Beijing University of Posts and Telecommunications, Beijing 100876, China) 北京邮电大学光通信R&D中心北京 100876 北京邮电大学光通信R&D中心北京

A multi-function device based on two terahertz optical asymmeric demultiplexers (TOAD) is proposed, which can be used simultancously as demultiplexing, data regeneration,clock recovery and wavelength conversion unit. The device can work at an ultra-high speed optical time-division multiplexing (OTDM) system with relativey low speed components.

关键词： OTDM clock recovery phase-lock loop (PLL) terahertz optical asymmetric demultiplexer (TOAD) data regeneration wavelength conversion