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2008 International Conference on Microwave and Millimeter Wave Technology(2008国际微波毫米波技术会议)

作者： Zhihui Pan Junhong Wang Key Lab of All Light Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Key Lab of All Light Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University

A novel ultra-wideband (UWB) bandpass filter (BPF)is proposed by using coupled microstrip lines and U-shaped defected ground structure (DGS).The input and output feeding lines are connected to the endsInthe same side of the coupled microstrip lines on one side of a substrate,and the U-shaped DGS is introduced behind the coupled lines on the other side of the substrate. The coupling ofThis kind of structure,if without DGS,is very weak. However,the U-shaped DGS generatesA strong coupling,and improves the passband property of the coupled lines. The filter is simulated by 3D EM commercial software,and the results demonstrate good UWB performances. The passband defined by |S11|<-10 dB is about 3.44-10.6 GHz,and the insertion loss is about 0.11 dB at central frequency of 7 GHz. The group delay variation,which is an important factor to UWB system,isless than 0.5 ns within the operating band.

关键词： Band pass filters Microstrip filters Passband Resonator filters Apertures Optical coupling Frequency FCC Attenuation Coplanar waveguides

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Fabrication and characteristics of Yb3+-doped silica optical fibers

Fabrication and characteristics of Yb3+-doped silica optical...

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Asia Optical Fiber Communication and Optoelectronic Exposition and Conference, AOE 2008

作者： Jing, Wang Jian, Li Peng, Liu XiangQiao, Mao Lin, Wang LiSong, Liu Jian, Peng ChenFang, Zhang Kai, Zheng Huai, Wei YongJun Fu, F. FengPing, Yan TiGang, Ning Wei, Jian 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 Physics department of XingTai college Xingtai 054001 China

ISBN: (纸本)9781557528636

A kind of single cladding highly Yb3+-doped silica optical fiber was fabricated by a new furnace round heating MCVD process. The best temperature of deposition pass and that of sensitive presintering pass were presented;the absorption of it achieved 594dB/m at 976nm and its background loss was only 0.1dB/m. © 2008 Optical Society of America.

关键词： Silica

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Fabrication of photosensitive polarization-maintaining erbium-doped fiber and application for fiber laser

Fabrication of photosensitive polarization-maintaining erbiu...

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Passive Components and Fiber-based Devices V

作者： Peng, Liu Fengping, Yan Lin, Wang Jian, Li Taorong, Gong Peilin, Tao Key Lab. of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China Physics department of Xingtai college Xingtai 054001 China

A new method of fabricating Panda-type photosensitive polarization- maintaining erbium-doped fiber(PM-EDF) is proposed and demonstrated. A sample of PM-EDF is fabricated using this method and an exhaustive analysis is made about the characteristics of PM-EDF, the results shows that this method is practicable. Two fiber Bragg Gratings (FBGs) are written into PM-EDF directly as the laser's reflectors, a three-states-tuned fiber laser is then obtained using a polarization controller (PC). © 2008 SPIE.

关键词： Fiber lasers

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A narrow-line-width multi-wavelength erbium-doped fiber laser using Arrayed-Waveguide Gratings

A narrow-line-width multi-wavelength erbium-doped fiber lase...

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Asia Communications and Photonics Conference and Exhibition (ACP)

作者： Jian Li Jing Wang Peng Liu WeiWei Jiang JingJing Zheng TiGang Ning ShuiSheng Jian Institute of Lightwave Technology Beijing Jiaotong University 100044 China Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing China

A simple multi-wavelength erbium-doped fiber laser with narrow-line-width lasing output was proposed and demonstrated using fiber Bragg gratings and Arrayed-Waveguide Gratings (AWG). Wavelength competition was naturally prevented in this kind of laser by using AWG in the linear-cavity. Experiment results showed that the laser can be operated stably in narrow-line-width with multi-wavelength output at room temperature.

关键词： Erbium-doped fiber lasers Optical arrays Fiber gratings Laser stability Optical fiber couplers Optical fiber sensors Optical fiber testing Optical fiber communication Laser modes Arrayed waveguide gratings

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Zero-Chirp Return-to-Zero Pulses Generation with Two Single-Driver z-Cut Mach-Zehnder Modulators

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Chinese Physics Letters 2007年第12期24卷 3431-3434页

作者：秦曦曹继红张峰王目光张建勇简水生 Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044

A novel method is proposed to suppress the frequency chirp of single-driver z-cut Mach Zehnder modulators. Theoretical analysis shows that by multiplying the output pulses of a half clock frequency driving single-driver z-cut modulator with the one delayed odd multiple bit duration, the frequency chirp can be removed entirely, and return-to-zero （RZ） pulses with duty cycles of about 25% and 56% are obtained. An experimental scheme is proposed to validate the proposed method. The pulses can be obtained by using this scheme. experimental results show that perfect 40 GHz zero-chirp RZ

关键词： TRANSMISSION SYSTEMS LINBO3 NRZ RZ Z-cut RADIATION AREAS Lithium niobate nonreturn to zero frequency chirp return-to-zero Modulators clock frequency

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Broad-band local field enhancement of A 2D nano-cavity

Broad-band local field enhancement of A 2D nano-cavity

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Optoelectronic Materials and Devices II

作者： Su, Xiao-Xing Liu, Feng Liu, Juan Jian, Shui-Sheng Key Lab. of All Optical Network and Advanced Telecommunication Network of EMC Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9780819469458

We investigate the local field enhancement properties of a 2D nano-cavity by using finite-difference time-domain (FDTD) method. The 2D nano-cavity is built by two pieces of silver slabs with periodical subwavelength corrugations on their inner boundaries. Numerical simulation result shows that the 2D nano-cavity can confine and enhance light field within the region smaller than the diffraction limit in a relatively broad range of wavelength. The result is useful for the research and development of new kinds of broadband optical sources used in WDM optical communication networks or micro-optical sensor system.

关键词： Nanostructured materials

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A novel fibre Bragg grating hydrophone system

A novel fibre Bragg grating hydrophone system

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Passive Components and Fiber-based Devices IV

作者： Wang, Yanhua Ren, Wenhua Tan, Zhongwei Liu, Yan Jian, Shuisheng Gong, Taorong Key Lab of All Optical Network and Advanced Telecommunication Network EMC Beijing Jiaotong University Beijing 100044 China Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9780819469441

A novel fibre Bragg grating (FBG) hydrophone system is introduced in the paper. The influence of the sound pressure on the FBG is transformed to light intensity measurement with tuned laser. Elastic material and matched FBGs are employed to enhance the sensitivity of the hydrophone system. The hydrophone system can operate in a wide acoustic frequency range from 100Hz to 3kHz and good linear relationship is observed between the output light intensity and the sound pressure.

关键词： Hydrophones

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Research on Pulse Radiation Characteristics of Leaf-like Ultra Wide Band Antenna

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Defence Technology（防务技术） 2007年第2期3卷 102-105页

作者：张春青王均宏陈美娥 Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University

A new kind of ultra wideband antenna,which consists of a leaf-like dipole and a dielectric block,is proposed and *** dielectric block is attached in parallel with the dipole near its feed ***,the near field is attracted to the side where the dielectric block is *** leads to a focusing effect of the energy in the far *** finite-difference time-domain(FDTD)method combined with the perfectly matched layers(PML)technique is used in the simulation of the antenna radiation *** research shows that,with proper dielectric loading and 50 Ω feeding line,the bandwidth of the antenna can be up to 6.5 GHz,from 3.5 GHz to 10 GHz with VSWR(voltage standing wave ratio)less than 2.5.

关键词：电子工艺超频率偶极子天线电介质

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Novel design of M-profile ytterbium doped fibers for high power fiber lasers

Novel design of M-profile ytterbium doped fibers for high po...

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Passive Components and Fiber-based Devices IV

作者： Jian, Li Mao, Xiang-Qiao Wang, Lin Peng, Jian Liu, Li-Song Wei, Huai Fu, Yong-Jun Ning, Ting-Gang Jian, Shui-Sheng 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

A novel design of M-Profile Ytterbium doped Fibers (YDFs) for high power fiber Lasers was given. The output power was two times higher than that in standard double-cladding fiber under the same threshold of damage.

ISBN: (纸本)9780819469441

关键词： Fiber lasers

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Analysis of Dispersion Properties in Highly Nonlinear Photonic Crystal Fibers

Analysis of Dispersion Properties in Highly Nonlinear Photon...

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2007年亚洲光纤通讯与光电博览会及研讨会(Asla Optical Fiber Communication & Optoelectronic Exposition & Conference)

作者： Honglei Li Shuqin Lou Hong Fang Lei Yao Shuisheng Jian Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China

A fully vectorial effective index method and multiple-cladding method (FVEIM&MCM) is developed for modeling photonic crystal fibers. The large negative dispersion and nearly zero flattened dispersion in highly non... 详细信息

关键词： Photonic crystal fibers Finite difference methods All-optical networks Electromagnetic compatibility Optical control Finite element methods Stimulated emission Pulse amplifiers Supercontinuum generation Pulse compression methods

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