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Optical Fiber Communication Conference and Exhibit

作者： Zhang, Jianyong Djordjevic, Ivan B. Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China University of Arizona Department of Electrical and Computer Engineering United States Key Lab of Alloptical Network and Advanced Telecommunication Network EMC Beijing Jiaotong University Beijing China

We present an optimum signal-constellation design (OSCD) method to obtain the optimum probabilities and mass points by split-step method. The OSCD increases channel capacity by 1.02bits/channel use after 2000 km of SM... 详细信息

ISBN: (纸本)9781457702136

关键词： Optical fibers

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Study on a Novel Linear-cavity Erbium-doped Fiber Laser Using a 3 dB Coupler as the Reflecting Mirror

Study on a Novel Linear-cavity Erbium-doped Fiber Laser Usin...

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2011 International Conference on Electronics and Optoelectronics(2011电子学与光电子学国际会议 ICEOE 2011)

作者： Jian Li Tining Ning Zhiming Liu Department of Communication and Signalling Beijing Railway Bureau Beijing China Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong Universi

ISBN: (纸本)9781612842752

A novel linear-cavity erbium-doped fiber laser is proposed and demonstrated. By using a 3 dB coupler as the reflecting mirror and an uniform fiber Bragg grating as the partial reflecting mirror and the wavelength selector, a stable laser output is obtained at room temperature. The full-width at half maximum, the side mode suppression ratio and the output power fluctuation are measured to be small than 0.014 nm, better than 40 dB and less than 0.43 dB, respectively. Furthermore, the lasing wavelength doses not drift in four hours.

关键词： erbium-doped fiber laser linear-cavity 3 dB coupler fiber Bragg grating

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Design and optimization of an ultra-broadband single-polarization single-mode photonic crystal fiber with large mode area

Design and optimization of an ultra-broadband single-polariz...

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中国光学学会纤维光学与集成光学专业委员会全国第15次光纤通信暨第16届集成光学学术会议

作者： Shuqin Lou Liwen Wang Weiguo Chen Honglei Li 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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A novel method of rapidly modeling optical properties of actual photonic crystal fibres

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Chinese Physics B 2010年第8期19卷 1-7页

作者：王立文娄淑琴陈卫国李宏雷 Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Institute of Lightwave Technology Beijing Jiaotong University

The flexible structure of photonic crystal fibre not only offers novel optical properties but also brings some difficulties in keeping the fibre structure in the fabrication process which inevitably cause the optical properties of the resulting fibre to deviate from the designed properties. Therefore, a method of evaluating the optical properties of the actual fibre is necessary for the purpose of application. Up to now, the methods employed to measure the properties of the actual photonic crystal fibre often require long fibre samples or complex expensive equipments. To our knowledge, there are few studies of modeling an actual photonic crystal fibre and evaluating its properties rapidly. In this paper, a novel method, based on the combination model of digital image processing and the finite element method, is proposed to rapidly model the optical properties of the actual photonic crystal fibre. Two kinds of photonic crystal fibres made by Crystal Fiber A/S are modeled. It is confirmed from numerical results that the proposed method is simple, rapid and accurate for evaluating the optical properties of the actual photonic crystal fibre without requiring complex equipment.

关键词： photonic crystal fibre digital image processing finite element method modeling optical properties

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Low-Profile Penta-Band Monopole Antenna for Mobile Communication Applications

Low-Profile Penta-Band Monopole Antenna for Mobile Communica...

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IEEE International Symposium on Microwave, Antenna, Propagation and emc Technologies for Wireless Communications

作者： Yu Han Junhong Wang Meie Chen Zhan Zhang Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781424482658

An internal monopole antenna with compact size is proposed in this paper, which can be applied to mobile communications, and its frequency band covers GSM850, GSM900, DCS, PCS, UMTS bands simultaneously. It is comprised of a driven monopole and a coupled loop strip. By inserting a folded slit in the driven rectangular patch, two wide bands are achieved. The antenna has a small area of 48 X 12 mm~(2), and is easy to be integrated into the mobile device. Details of the antenna design and experimental results are presented.

关键词： monopole antenna multi-band antenna mobile communication

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Radiation and Scattering Properties of the Dual-Port Fed Differential Microstrip Antennas

Radiation and Scattering Properties of the Dual-Port Fed Dif...

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IEEE International Symposium on Microwave, Antenna, Propagation and emc Technologies for Wireless Communications

作者： Weiwei Xu Junhong Wang Zhan Zhang Meie Chen Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781424482658

For traditional differential fed microstrip patch antenna, the phase difference between the two excitation ports is set to 180 deg. In this paper, the radiation and scattering characteristics of differential microstrip antenna fed by phase difference out of 180 deg are studied. The variations of the co-polarization and cross-polarization radiations of the antenna are analyzed, and the bi-static and mono-static scattering properties of the antenna are also studied. The radiation and scattering characteristics of the two port fed differential antenna are compared with those of the single port fed antennas. Research results show that it is possible to find a phase difference of excitation of dual-port fed antenna that gives low cross-polarization radiation and low scattering.

关键词： differential fed antenna radiation characteristics scattering properties microstrip patch antennas

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Optical ultra-wideband pulse generation and distribution using a dual-electrode Mach-Zehnder modulator

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Chinese Optics Letters 2010年第2期8卷 138-141页

作者：李晶宁提纲裴丽祁春慧 Institute of Lightwave Technology Beijing Jiaotong University Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University

A novel approach to generate and distribute ultra-wideband （UWB） pulses in optical domain is investigated. In this proposed scheme, a dual-electrode Mach-Zehnder modulator （DE-MZM） is biased at its quadrature point so as to realize the linear response. Then the intensity of output optical field can be assumed to the subtraction of two input Gaussian pulses. If the input Gaussian pulses are with the same sharp parameters but different time delays, a quasi-monocycle-waveform UWB signal can be generated. If the input Gaussian pulses are with different amplitudes and full-width at half-maximum （FWHM）, a quasi-doublet-waveform UWB signal can be generated. A transmission of the UWB signals through a 25-km single mode fiber is carried out successfully. The results in both temporal and frequency domains are also presented.

关键词： Light modulators Modulation Pulse generators Single mode fibers

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Fabrication of Optical Fiber Bragg Grating Assisted Mismatched Coupler

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Chinese Physics Letters 2010年第1期27卷 155-158页

作者：刘志明李坚郑晶晶范林勇江微微简水生 Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 Signal and Communicaiton Research Institute China Academy of Railway Sciences Beijing 100081

We report the fabrication of an optical fiber Bragg grating assisted mismatched coupler based on the fused biconical tapered technology. The investigation of the spectrum properties shows that the coupler has a good filtering property. The drop filtering efficiency as much as 94.2% at 1553.5nm is achieved. Furthermore, using the fabricated coupler, a wavelength de-multiplexing transmission experiment is carried out in a 10Gbps system with NRZ optical signals. Experimental results show that the coupler basically realizes the function of wavelength de-multiplexing.

关键词： Chinese climate network complex systems small world community

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Capacity achieving signal constellation diagram of fiber-optic channel

Capacity achieving signal constellation diagram of fiber-opt...

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Laser Science, LS 2010

作者： Zhang, Jianyong Djordjevic, Ivan B. Batshon, Hussam G. Jian, ShuiSheng Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China University of Arizona Department of Electrical and Computer Engineering Beijing Jiaotong University Beijing China Key Lab of Alloptical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing China

We describe a method to determine the optimum signal constellation diagram of arbitrary fiber-optic channel. The numerical results indicate that the optimized signal constellation has discrete amplitude and non-circul... 详细信息

关键词： Coherent receivers Coherent systems Erbium fibers Fiber optic amplifiers Optical fibers Single mode fibers Fiber optics and optical communications (060.0060) Fiber optics communications (060.2330) Optical communications (060.4510)

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P-06 experiment research of the temperature sensor based on twin-core fiber

P-06 experiment research of the temperature sensor based on ...

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IMEKO TC2 Symposium on Photonics in Measurements 2010

作者： Zhao, Ruifeng Pei, Li Li, Zhuoxuan Ning, Tigang Fan, Linyong Jiang, Weiwei Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781617823510

A low cost, compact and lossless temperature sensor based on twin-core fiber(TCF) is demonstrated and manufactured by splicing two single mode fibers(SMF) to the ends of a piece of TCF. The extinction ratio of the comb transmission spectrum is bigger than 15dB. The operating temperature range from-30°C to175°C is tested and the temperature sensitivity of 0.02 rad / C /m below 90 and 0.032 rad / C /m above 90 is obtained. Finite element method (FEM) is used to calculate the propagation constant of the two supermodes, which is consistent with the comb transmission spectrum of the experiment.

关键词： Temperature sensors

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