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International Conference on Microwave Technology & Computational Electromagnetics

作者： Yujia Ruan Zhan Zhang Lei Tang Shouliang Li Junhong Wang Key Lab of All Optical Network & Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781467363266

Although the analysis of electromagnetic sources transformation under the theory of transformation optics has been widely discussed in many literatures, there are few discussions about actual antennas in the context of coordinate transformation. In this paper, we deduce the proper feeding formulation which is excited upon antennas according to the transformation method of ideal electromagnetic sources, and validate the analysis through numerical simulation of a specific example. This analysis shows that we can design a conformal antenna which has the same field distribution with the antenna having the desired performance by covering the antenna with transformed media. This method provides a new way in designing conformal antennas.

关键词： Conformal antenna feeding gap surface current transformation optics

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Fabrication of twin-core fiber and its application in all-fiber comb filter

Fabrication of twin-core fiber and its application in all-fi...

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Information Optoelectronics, Nanofabrication and Testing, IONT 2012

作者： Pei, Li Li, Zhuoxuan Liu, Chao Ning, Tigang Li, Chao Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781557529602

Twin core fibers(TCFs) with different cross section and core center-to-center distance were fabricated by our innovative method. The fiber comb filters based on a TCF coupler with an uniform free spectral range and based on a TCF Mach-Zehnder interferometer with flat passband have been discussed. The splicing techniques of the TCF have been studied,and a novel all-fiber connector is proposed for connecting each core of a TCF to a single-core fiber (SCF) core simultaneously. © 2012 OSA.

关键词： Optical fiber communication

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A simple mechanism to suppress the mode competition for stable and tunable dual-wavelength erbium-doped fiber lasers

A simple mechanism to suppress the mode competition for stab...

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2012 International Meeting on Opto-Electronics Engineering and Materials Research, OEMR 2012

作者： Zhang, Chenfang Sun, Jiang Zheng, Siwen Jian, Shuisheng 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

ISBN: (纸本)9783037854884

A suppressant effect for mode competition of dual-wavelength lasing oscillations induced by polarization hole burning effect in an ordinary erbium-doped fiber is proposed and experimentally demonstrated. The polarization hole burning effect is introduced by an all fiber polarization controller directly fused with a segment of erbium-doped fiber. The mechanism of the all fiber polarization controller to suppress the wavelength competition is described in detail. Results show that the mechanism is helpful to obtain stable dual-wavelength lasing oscillations at room temperature in the erbium-doped fiber laser. By adjusting the comb filter, the wavelength tuning between different dual-wavelength oscillations is realized. The side mode suppression ratio of each lasing wavelength is measured to be more than 55dB. The 3dB bandwidth of each lasing oscillation is 0. 01nm and the 30dB bandwidth is 0. 10nm. The power fluctuation and wavelength shift are measured to be less than 0. 8dB and 0. 05nm over 32 minutes for all the dual-wavelength lasing oscillations obtained in the experiment. © (2012) Trans Tech Publications, Switzerland.

关键词： Bandwidth

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Study on sensor for solution concentration and temperature based on fused tapering optical fiber coupler

Study on sensor for solution concentration and temperature b...

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2012 International Symposium on Photonics and Optoelectronics, SOPO 2012

作者： Lv, Min Ren, Guobin Yang, Xiaoyu Ding, Jianbo Wang, Wenzhong College of Science Minzu University of China Beijing 100081 China 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

ISBN: (纸本)9781457709111

A simple and high-degree accuracy sensor for solution concentration and temperature based on fused tapering optical fiber coupler is fabricated. The change of refractive index in the evanescent field on the fused region of an optical fiber coupler shifts the output coupling visibility. Therefore the coupling visibility is changed with variation of solution concentration (refractive index) and temperature surrounding the fused tapering zone of the coupler. The sodium chloride solution is studied experimentally. Based on the experiment data and the least square method, the concentration accuracy of the coupler sensor is evaluated to be 10e-3 and the temperature accuracy is about 0.823°C. The stability of the sensor system with the optical coupler can reach the order of 10e-4. This simple, low-cost, good-stability and high-degree accuracy coupler sensor is suitable to be used in the environmental monitoring, analytical chemistry, and food safety testing. © 2012 IEEE.

关键词： Refractive index

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Switchable dual-wavelength erbium-doped fiber laser based on polarization-maintaining fiber Sagnac loop mirror and fiber Bragg gratings

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Chinese Optics Letters 2012年第B06期10卷 43-45页

作者：许鸥冯素春 Faculty of information engineering Guangdong University of Technology Guangzhou 510006 China Institute of Lightwave Technology Key Lab of All Optical Network ~ Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China

A switchable dual-wavelength erbium-doped fiber laser is proposed and experimentMly demonstrated, which is constructed by a polarization-maintaining fiber Sagnac loop mirror （PMF-SLM） and two FBGs with different wavelengths. Wavelength switching operation is achieved by properly adjusting the polariza~ tion controller （PC） in the PMF-SLM. Stable single- or dual-wavelength lasing output can be realized. The maximum amplitude variation for every lasing wavelength is less than 1 dB, and the signal-to-amplified spontaneous emission （ASE） ratio is about 35 dB.

关键词： 060.0060 Fiber optics and optical communications 140.0140 Lasers and laser optics 230.0230 Optical devices

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Optimized four-dimensional mapping for high-speed optical communication systems

Optimized four-dimensional mapping for high-speed optical co...

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Optical Fiber Communication Conference, OFC 2012

作者： Zhang, Jianyong Djordjevic, Ivan B. Key Lab of Alloptical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China University of Arizona Department of Electrical and Computer Engineering United States Institute of Lightwave Technology Beijing Jiaotong University Beijing100044 China

We propose an optimized mapping rule for the 32-point four-dimensional crossconstellation for high-speed optical communications based on bit-interleaved coded-modulation with iterative decoding. The optimized mapping ... 详细信息

ISBN: (纸本)9781557529381

关键词： Mapping

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All f iber 1.55- \mu m SLM DBR f iber laser with 10-Gb/s NRZ-OOK transmission over 100-km f iber link

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中国光学快报（英文版） 2012年第S2期10卷 S20602页

作者： Suchun Feng Kangping Zhong Nan Jia Qi Li Wanjing Peng Key Lab. of All Optical Network and Advanced Telecommunication Network of EMC Institute of Lightwave Technology Beijing Jiaotong University Beijing 100044 China

The 10-Gb/s non-return-to-zero (NRZ) on-off-keying (OOK) data transmission over a 100-km transmission fiber link employing an all fiber 1.55-\mu m single longitudinal mode (SLM) distributed Bragg reflector (DBR) fiber laser as the signal source is demonstrated. The experimental result is comparable with that of the transmission system by using a commercially semiconductor distributed feedback (DFB) laser.

关键词： 060.3510 060.2330 060.2360 060.2380

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All-optical passive periodic sawtooth filter and its application to fast interrogation of fiber Bragg grating sensor array

All-optical passive periodic sawtooth filter and its applica...

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2012 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference, OFC/NFOEC 2012

作者： Tan, Zhongwei Wang, Chao Goda, Keisuke Malik, Omer Jalali, Bahram Institute of Lightwave Technology Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China Electrical Engineering Department University of California Los Angeles CA 90095 United States California NanoSystems Institute Los Angeles CA 90095 United States Department of Bioengineering University of California Los Angeles CA 90095 United States Department of Surgery David Geffen School of Medicine University of California Los Angeles CA 90095 United States

We propose and demonstrate a low-cost all-optical passive spectral filter that exhibits a high-resolution periodic sawtooth spectral pattern and its application to fast sensitive interrogation of a fiber Bragg grating... 详细信息

ISBN: (纸本)9781467302623

关键词： Fiber Bragg gratings

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Multi-Beam Interference Transmission Spectrum Observed from an Eccentric Core Single-Mode Fiber

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Chinese Physics Letters 2011年第2期28卷 122-125页

作者： FAN Lin-Yong JIANG Wei-Wei ZHAO Rui-Feng PEI Li JIAN Shui-Sheng Institute of Lightwave Technology Beijing Jiaotong UniversityBeijing 100044 Key Lab of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong UniversityBeijing 100044

An eccentric core single-mode fiber,whose core is away from the axis of the fiber,is fabricated by using the fiber preform goniometric-groove method and the stack-and-draw *** eccentric core single-mode fiber without coating is spliced between two single-mode *** mode and cladding modes are excited at one splicing point between the eccentric core single-mode fiber and the single-mode fiber,and propagate in the eccentric core single-mode fiber,then interfere with each other at the other splicing ***-beam interference transmission spectrum is *** in-line fiber interferometric strain sensor based on the eccentric core single-mode fiber is realized.

关键词： fiber mode cladding

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Frequency-octupling millimeter-wave generation based on optical two-step self-heterodyne technique

Frequency-octupling millimeter-wave generation based on opti...

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International Conference on advanced Infocomm Technology 2011, ICAIT 2011

作者： Gao, Song Pei, Li Ning, Tigang Li, Jing Qi, Chunhui Liu, Chao Yan, Junfang Institute of Lightwave Technology Key Lab. of All Optical Network and Advanced Telecommunication Network of EMC Beijing Jiaotong University Beijing 100044 China

ISBN: (纸本)9781849194730

A cost-effective frequency-quadrupling scheme which is capable of generating high frequency millimeter-wave (mm-wave) signal is theoretically proposed. By employing optical two-step self-heterodyne technique, this scheme is easy to realize and have a high efficiency. Base on this scheme, a frequency-octupling frequency component is generated. This proposed scheme is a viable solution for the future ultra-high frequency mm-wave applications.

关键词： Millimeter waves

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