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Cost-effective tunable fiber laser based on self-seeded Fabry-Perot laser diode using a Sagnac loop reflector

Chinese Optics Letters 2010年第12期8卷 1150-1151页

作者：朱敏肖石林毕美华陈荷胡卫生 State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong University

We propose and demonstrate a simple configuration of wavelength-tunable fiber laser made up of a tunable band-pass filter, a Sagnac loop refiector, and a Fabry-Perot laser diode. Based on the self-seeded operation, the proposed fiber laser can obtain a single-longitudinal-mode output in the wavelength tuning range of 1544.69–1563.39 nm with tuning step of 1.34 nm. The performances of output power （-9 dBm）, optical side-mode suppression ratio （ 65.5 dB）, and power and wavelength stabilities are well exhibited.

关键词： Bandpass filters Fabry Perot interferometers Reflection

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Nonlinear optics in subwavelength plasmonic nanostructures

Nonlinear optics in subwavelength plasmonic nanostructures

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2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011

作者： Panoiu, Nicolae C. Biris, Claudiu C. Ye, Fangwei Cao, Lina Osgood Jr., Richard M. Department of Electronic and Electrical Engineering University College London Torrington Place London WC1E 7JE United Kingdom Department of Physics State Key Lab. on Fiber Optic Loc. Area Commun. Networks and Advanced Optical Communication Systems Shanghai Jiao Tong University Shanghai 200240 China Department of Applied Physics and Applied Mathematics Columbia University New York NY 10027 United States

ISBN: (纸本)9781457705335

In the last decade, the advances in integrated optics and photonic nano-devices have been greatly accelerated by the availability of high performance computing platforms and powerful numerical methods for device simulation and computer-aided design. Thus, high fabrication costs of complex photonic nano-devices make it imperative to have access to high-performance computational tools, which can greatly accelerate the device design process and reduce the design-fabrication-testing cycle. In this connection, in this talk we briefly review and compare several numerical methods that are commonly used to model the nonlinear optical properties of plasmonic nano-structures and, subsequently, by using specific examples, we illustrate how these methods can be employed to design and characterize active plasmonic nano-structures with unique optical properties. Examples of such nonlinear effects in plasmonic nanostructures include nonlinear excitation of plasmon modes in plasmonic cavities [1,2], formation of subwavelength plasmonic solitons [3] and plasmonic vortices [4] in plasmonic arrays, and nonlinear wave scattering by defects of metallic surfaces [5]. © 2011 IEEE.

关键词： Plasmonics

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Incident Light Influence on the Transmission of Coupled Ring Resonators

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Tsinghua Science and Technology 2010年第2期15卷 198-201页

作者：孙月徐连宇彭超李正斌 State Key Laboratory on Advanced Optical Communication Systems & Networks School of Electronic Engineering and Computer Science Peking University

The transmission matrix method is used to analyze the influence of incident light on coupled resonators. Two different types of incident light on the same coupled resonator geometry are shown to lead to different system transmission features. The EIT-like phenomenon occurs in the type I case with the transmission being symmetric around the zero-single-pass-phase-shift frequency. In the type Ⅱcase the resonant frequency has a blue shift corresponding to the increasing coupling strength between the two ring resonators. Also, the critical-coupling-like condition exists in the type Ⅱconfiguration to maintain the zero-single pass-phase-shift frequency. The incident light, as well as the geometry, partially determine the mode interference in the coupled ring resonator system.

关键词： coupled ring resonator mode excitation resonance frequency shift

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Novel WDM-PON architecture for simultaneous transmission of unicast data and multicast services

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Chinese Optics Letters 2010年第10期8卷 972-975页

作者：朱敏肖石林郭薇胡卫生 Benoit Geller State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic Engineering Shanghai Jiao Tong University Lab of Electronics and Computer Engineering ENSTA ParisTech

We propose a novel wavelength-division multiplexed passive optical network （WDM-PON） to simultaneously transmit unicast data and multicast services with upstream data re-modulation in optical network units （ONUs）. For each wavelength channel in the optical line terminal （OLT）, the downstream unicast data are applied to one arm of a dual-parallel Mach-Zehnder modulator （DPMZM） to generate baseband unicast non-return-to-zero （NRZ） signal. A radio frequency （RF） control signal is applied to the other arm to present two un-modulated sidebands for multicast data modulation in a differential phase-shift keying （DPSK） format. The flexible and dynamic multicast services are realized by simply switching the RF control signal on or off. The proposed scheme is experimentally demonstrated with 1.25-Gb/s downstream unicast, multicast, and upstream data.

关键词： Fiber optic networks Light modulators Multicasting Wavelength division multiplexing

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A novel polarization channel drop filter based on two-dimensional photonic crystals

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Chinese Optics Letters 2010年第8期8卷 749-752页

作者：任宏亮覃亚丽刘恺吴哲夫胡卫生姜淳金耀辉 Institute of Fiber Optic Communication and Information Engineering College of Information EngineeringZhejiang University of Technology State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University

A novel polarization channel drop filter （PCDF） based on two-dimensional （2D） photonic crystals （PCs） is presented. It consists of two line defect waveguides and two point defect micro-cavities. In the line-defect waveguides, the transverse-electric （TE） and transverse-magnetic （TM） polarization lights are guided using photonic band-gap and total internal reflection effect, respectively. The light at the resonant frequency for TE polarization can be transferred from one waveguide to the other using the proposed system. Compared with the existing four-port PCDF based on PCs, the three-port structure can realize a multi-channel wavelength system of PCDF more easily and can be an essential device in future polarization wavelength division multiplexing （PWDM） systems.

关键词： Defects Drops Multiplexing Multiplexing equipment Natural frequencies optical waveguides Photonic band gap Point defects Polarization Refractive index Two dimensional Waveguides

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Hybrid WDMA/OCDM system with the capability of encoding multiple wavelength channels by employing one encoder and one corresponding optical code

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Chinese Optics Letters 2010年第8期8卷 745-748页

作者：陈荷肖石林朱敏史杰毕美华 State Key Lab of Advanced Optical Communication Systems and Networks Department of Electronic EngineeringShanghai Jiao Tong University School of Information Science and Engineering Xinjiang University

A hybrid wavelength division multiple access （WDMA）/optical code division multiplexing （OCDM） system is proposed, where the optical code is not the same as the address of every optical network unit （ONU）; rather, the code is a virtual fiber of hybrid passive optical network （PON）. To our knowledge, this is the first report analyzing a single encoder/decoder with a single corresponding optical code being exploited to encode/decode multiple wavelength signals simultaneously. This system enables OCDM to become transparent to ONU so that the existing wavelength division multiplexing （WDM） PON can be upgraded. Thus, redesigning the optical line terminal and ONU can be easily accomplished, and greatly decreasing the number of encoder/decoder becomes possible. In experiment, we only employ two encoder/decoder pairs to combine two WDM-PONs in one fiber. Simulation results confirm the feasibility of the proposed system.

关键词： Code division multiple access Encoding (symbols) Fiber optic networks Multiplexing equipment optical communication Wavelength division multiplexing

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Polarization-based all-optical logic gates employing electro-optic effect in periodically poled LiNbO3

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Zhongguo Jiguang/Chinese Journal of Lasers 2011年第SUPPL. 1期38卷 s117001-1-s117001-4页

作者： Zhang, Yinxing Chen, Yuping Chen, Xianfeng State Key Lab. on Fiber Optic Local Area Commun. Networks and Advanced Optical Communication Syst. Department of Physics Shanghai Jiao Tong University Shanghai 200240 China

A simple approach based on polarization to process binary all-optical logic signal with validation is proposed, by electro-optic Pokels effect. In experiment, we choose optical signal with two orthogonal linear polarization states to present logic 1 and 0. This approach can alter the polarization state of input optical signal about 90° on the polarization plane based on electro-optic modulation of periodically poled lithium niobate (PPLN). optical signal can be switched between the two orthogonal polarization states, and polarization direction will be not changed without external applied electric field. Therefore, it can realize controllable-NOT function. If we choose external applied electric field to present logic 1 and 0, it can realize NOR and XNOR functions. In this approach, digital logic signal is carried on the polarization state of optical signal. The dissipation of intensity of optical signal is very small in this process, so this approach is more advantageous for multiply cascaded systems, comparing with traditional approach, in which digital logic signal is carried on the intensity of optical signal.

关键词： Electric fields

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The breaking point between fast-and slow-light in a degenerate two-level atomic system

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Chinese Physics B 2010年第6期19卷 325-329页

作者：李路明胡振燕罗斌郭弘 Department of Communication Jiangxi Electric Power Information and Communication Company CREAM Group State Key Laboratory of Advanced Optical Communication Systems and Networks (Peking University) and Institute of Quantum ElectronicsSchool of Electronics Engineering and Computer SciencePeking University

This paper investigates the breaking point between fast- and slow-light in a degenerate two-level atomic system, where fast-light can be converted to slow-light arbitrarily on a single transition line by adjusting the strength of the pumping field. An equivalent incoherent pumping rate is introduced in this simplified theoretical model which exploits the dependence of this feature. The experimental observation is presented as evidence of the breaking point where the injected power is about 0.08 mW.

关键词： degenerate two-level atomic system breaking point group velocity

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A novel coherent optical single-carrier Frequency-division-multiplexing (CO-SCFDM) scheme For optical fiber transmission system

A novel coherent optical single-carrier Frequency-division-m...

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Photonics in Switching, PS 2010

作者： Juhao, Li Zhang, Su Zhang, Fan Chen, Zhangyuan State Key Lab. of Advanced Optical Communication Systems and Networks Peking University Beijing 100871 China

We propose a novel coherent optical single-carrier frequency-division-multiplexing (CO-SCFDM) scheme, which has significantly lower PAPR while achieves high commonality in parameter design with CO-OFDM system. Moreove... 详细信息

ISBN: (纸本)9781557528957

关键词： Peak to average power ratio

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An all-fiber resonator composed of single-channel side-coupled microresonator sequence

An all-fiber resonator composed of single-channel side-coupl...

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19th Annual Wireless and optical communications Conference, WOCC2010: Converging communications Around the Pacific

作者： Shen, Xiaowei Li, Xinwan Hong, Zehua Shen, Jianguo Yu, Xiaocao Zhou, Minwen Chen, Jianping State Key Laboratory of Advanced Optical Communication Systems and Networks Shanghai Jiao Tong University Shanghai 200030 China

ISBN: (纸本)9781424475964

An all-fiber resonator composed of single-channel side-coupled microresonator sequence is proposed, in which a sequence of optical fibers, serve as microresonator, and a subwavelength-diameter optical fiber(SDF) with diameter about 1μm is placed along the microresonator perimeter, coupling light into whispering-gallery-modes(WGMs) of the microresonator. The transmission property and dispersion relation are analyzed by transfer matrix method. Infinite sequence structure show band gaps created by Bragg and ring resonances. Finite sequence structure shows a quality factor (Q factor) of 2, 500, a free spectral range (FSR) of 4.7nm and extinction ratio of 5.9dB (one resonator), 6.2dB (two resonator sequence) and 7.8dB (three resonator sequence), respectively. The proposed resonator can be tuned by changing refractive index of microresonator. This device is easy to fabricate and to connect to fiber system. ©2010 IEEE.

关键词： optical fibers

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