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All-optical Ultra-High-Speed OFDM to Nyquist-WDM Conversion Based on Complete optical Fourier Transformation

JOURNAL OF LIGHTWAVE TECHNOLOGY 2016年第2期34卷 626-632页

作者： Guan, Pengyu Roge, Kasper Meldgaard Mulvad, Hans Christian Hansen Galili, Michael Hu, Hao Lillieholm, Mads Morioka, Toshio Oxenlowe, Leif Katsuo Tech Univ Denmark DTU Foton Dept Photon Engn DK-2800 Lyngby Denmark Univ Southampton Optoelect Res Ctr Southampton SO17 1BJ Hants England

We propose a novel all-optical ultra-high-speed orth ogonal frequency-division multiplexing (OFDM) to Nyquist wavelength-division multiplexing (Nyquist-WDM) conversion scheme, achieved by exchanging the temporal and spectral profiles using a complete optical Fourier transformation (OFT). This scheme enables high-speed OFDM to Nyquist-WDM conversion without complex optical/electrical/optical conversion. The all-optical OFDM transmitter is based on the generation of OFDM symbols with a low duty cycle by rectangular temporal gating, which in combination with optical time-division multiplexing yields a higher symbol-rate OFDM signal. In the receiver, the converted Nyquist-WDM super-channel is WDM demultiplexed into individual Nyquist-WDM channels using a rectangular optical bandpass filter, followed by optical sampling at the intersymbol-interference free point. In the experimental demonstration, a single-polarization 8-subcarrier 640 Gbs differential phase-shift keying OFDM super-channel with a spectral efficiency (SE) of 0.8 symbols Hz is generated. The OFDM super-channel is then converted to eight 80-Gbs Nyquist-WDM channels by complete OFT. The complete OFT is based on two quadratic phase-modulation stages using four-wave mixing, separated by a dispersive medium. In the receiver, a BER < 10(-9) is obtained for all channels. The SE remains unchanged after conversion.

关键词： All-optical OFDM optical Fourier transformation optical time-division multiplexing (OTDM) nonlinear optical signal processing Nyquist WDM

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Bistatic radar scheme based on the digital-analog hybrid chaos system

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OPTICS EXPRESS 2018年第17期26卷 22491-22505页

作者： Cheng, Mengfan Jiang, Xingxing Luo, Chenkun Fu, Yudi Luo, Fengguang Deng, Lei Liu, Deming Huazhong Univ Sci & Technol NGIA NEL Sch Opt & Elect Informat Wuhan 430074 Peoples R China

Bistatic radar with the separate transmitter and receiver has some attractive merits, thus obtaining many attentions. However, in a traditional bistatic radar system, there are still many problems that hinder it from practical applications. Here we introduce a bistatic radar scheme using a well-designed optical chaos system, from which the analog chaos signal could be determined by generated random binary sequence. The broad bandwidth analog signal is used as surveillance signal and the digital signal are transmitted to the receiver by optical fibers. Finally, high spatial and velocity resolutions of radar system could be obtained by using the analog chaos signal. A high-quality regeneration of the reference signal at different locations can be established by transmitting the digital sequence. Moreover, the mutual interferences could be concealed since the analog surveillance signal and the transmitted digital sequence are delivered by different paths. These could be advantageous for radar applications. (C) 2018 optical Society of America under the terms of the OSA Open Access Publishing Agreement

关键词： Diode lasers Fiber optic amplifiers nonlinear optical signal processing optical fibers Phase modulation Tunable lasers

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Compact Brillouin-erbium fiber laser

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OPTICS LETTERS 2009年第1期34卷 46-48页

作者： Harun, S. W. Shahi, S. Ahmad, H. Univ Malaya Dept Elect Engn Kuala Lumpur 50603 Malaysia Univ Malaya Photon Res Ctr Kuala Lumpur 50603 Malaysia

A single-wavelength Brillouin fiber laser (BFL) is demonstrated at the extended L-band region using bismuth-based erbium-doped fiber (Bi-EDF) for the first time to the best of our knowledge. A 2.15-m-long Bi-EDF is used to provide both nonlinear and linear gains to generate a stimulated Brillouin scattering (SBS) and to amplify the generated SBS, respectively. The BFL operates at 1613.93 nm, which is upshifted by 0.09 nm from the Brillouin pump with a peak power of 2 dBm and a side-mode suppression ratio of more than 22 dB. The generated BFL has a narrow linewidth and many potential applications, such as in optical communication and sensors. (C) 2008 optical Society of America

关键词： Erbium fibers Fiber lasers nonlinear optical signal processing optical sensing Stimulated Brillouin scattering Stimulated scattering

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Phase-dependent light switching in triple-Λ system

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JOURNAL OF THE optical SOCIETY OF AMERICA B-optical PHYSICS 2015年第7期32卷 1267-1271页

作者： Sohn, Byoung-Uk Kim, Bongjune Ko, Do-Kyeong Kang, Hoonsoo GIST Dept Phys & Photon Sci Gwangju 500712 South Korea GIST Adv Photon Res Inst Gwangju 500712 South Korea

We theoretically studied a triple-Lambda system comprising three pairs of coupling-probe fields. Three probe fields were phase-dependently switched with a switching depth above 80%, at which the group-velocity matching of all probe pulses was available under slow light-propagation conditions. We considered the probe susceptibility as the superposition of three-photon transitions to systematically understand the multi-photon interference in a triple-Lambda system, which can be applied to systems with N - Lambda (N >= 1). This helped us to tailor the probe susceptibility by adjusting the detuning and phases of the coupling and probe fields. This work can be applied to all-optical switching gates for triple-photons and can enhance the speed of processing optical information. (C) 2015 optical Society of America

关键词： Coherent optical effects nonlinear optical signal processing nonlinear optics parametric processes

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Ultrahigh-bandwidth, on-chip all-optical pulse erasure using the χ⁽³⁾ process in a nonlinear chalcogenide waveguide

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OPTICS LETTERS 2011年第2期36卷 298-300页

作者： Pant, Ravi Vo, Trung D. Xiong, Chunle Pelusi, Mark D. Madden, Steve J. Luther-Davies, Barry Eggleton, Benjamin J. Univ Sydney Sch Phys IPOS Sydney NSW 2006 Australia Australian Natl Univ Laser Phys Ctr Canberra ACT 0200 Australia Ctr Ultrahigh Bandwidth Devices Opt Syst Sydney NSW Australia

We demonstrate on-chip all-optical pulse erasure based on four-wave mixing and cross-phase modulation in a dispersion engineered chalcogenide (As2S3) rib waveguide. We achieve an erasure efficiency of similar to 15 dB for picosecond pulses in good agreement with numerical simulations using the nonlinear Schrodinger equation. The combined effect of the high instantaneous optical nonlinearity (gamma = 9900 (Wkm)(-1)) and small group-velocity dispersion (D = 29 ps/nmkm), which reduces pulse walk-off, will enable all-optical pulse erasure for ultrafast signal processing. (C) 2011 optical Society of America

关键词： Cross phase modulation Erbium doped fiber amplifiers nonlinear optical signal processing Numerical simulation Phase shift Picosecond pulses

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Introduction: nonlinear Optics (NLO) 2017 feature issue

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optical MATERIALS EXPRESS 2018年第2期8卷 491-492页

作者： Hagan, David J. Denz, Cornelia Suchowski, Haim Biaggio, Ivan Sheik-Bahae, Mansoor Univ Cent Florida Coll Opt & Photon CREOL Orlando FL 32816 USA Univ Munster Inst Appl Phys D-48149 Munster Germany Tel Aviv Univ Sch Phys & Astron Dept Condensed Matter Phys IL-69978 Tel Aviv Israel Lehigh Univ Dept Phys Bethlehem PA 18015 USA Lehigh Univ Ctr Photon & Nanotechnol Bethlehem PA 18015 USA Univ New Mexico Dept Phys & Astron Albuquerque NM 87131 USA

The editors introduce the feature issue on "nonlinear Optics 2017," based on the topics presented at the NLO 2017 conference, which was held in Waikoloa, Hawaii, USA from July 17-21, 2017. This feature issue is jointly published by Optics Express and optical Materials Express. (c) 2018 optical Society of America under the terms of the OSA Open Access Publishing Agreement

关键词： nonlinear effects nonlinear optical materials nonlinear optical signal processing nonlinear optics optical materials Surface plasmons

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On-chip high-efficiency wavelength multicasting of PAM3/PAM4 signals using low-loss AlGaAs-on-insulator nanowaveguides

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OPTICS LETTERS 2020年第16期45卷 4539-4542页

作者： Qin, Jun Shu, Haowen Chang, Lin Xie, Weiqiang Tao, Yuansheng Jin, Ming Wang, Xingjun Bowers, John E. Peking Univ Sch Elect Engn & Comp Sci Dept Elect State Key Lab Adv Opt Commun Syst & Networks Beijing 100871 Peoples R China Univ Calif Santa Barbara Dept Elect & Comp Engn Santa Barbara CA 93106 USA Peking Univ Minist Educ Nanooptoelect Frontier Ctr Beijing 100871 Peoples R China

nonlinear optics-based optical signal processing (OSP) could potentially increase network flexibility because of its transparency, tunability, and large bandwidth. A low-loss, high nonlinearity, and compact integrated material platform is always the pursuit of OSP. In this Letter, a high-efficiency, one-to-six wavelength multicasting of 10 Gbaud pulse-amplitude modulation (PAM3/PAM4) signals using a 6 cm long Al0.2Ga0.8As-on-insulator nanowaveguide is experimentally demonstrated for the first time, to the best of our knowledge. The low-loss, combined with the high nonlinear coefficient of the AlGaAsOI platform, enables us to achieve -11.2 dB average conversion efficiency clear eye diagrams and <2.1 dB power penalty at KP4-forward error correction threshold (2.4 x 10(-4)) for all the output PAM3/PAM4 multicasting channels. This result points to a new generation of nonlinear OSP photonic integrated circuits. (C) 2020 optical Society of America

关键词： Amplified spontaneous emission Fiber optic communications nonlinear optical signal processing optical networks Physical vapor deposition Quadrature amplitude modulation

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nonlinear pulse dynamics in multimode silicon core optical fibers

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OPTICS LETTERS 2012年第16期37卷 3351-3353页

作者： Peacock, Anna C. Mehta, Priyanth Horak, Peter Healy, Noel Univ Southampton Optoelect Res Ctr Southampton SO17 1BJ Hants England

Multimode propagation in silicon core optical fibers is investigated via numerical modeling of the coupled mode equations. The simulations consider spectral evolution in two fibers with different micrometer-sized cores that have experimentally been shown to exhibit nonlinear broadening. The results indicate that most of the coupled power is propagated in the fundamental mode of each fiber, with a small contribution from the higher-order modes affecting the spectral shape but not the width of the broadening. (C) 2012 optical Society of America

关键词： Multimode fibers nonlinear optical fibers nonlinear optical signal processing optical fibers Silica fibers Sum frequency generation

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Observation of elliptical polarization rotation in a long twisted fiber

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OPTICS LETTERS 2006年第7期31卷 882-884页

作者： Tanemura, T Kikuchi, K Univ Tokyo Adv Sci & Technol Res Ctr Meguro Ku Tokyo 1538904 Japan

The intensity-dependent polarization rotation caused by the self-induced nonlinear birefringence in a long twisted fiber is studied numerically and experimentally. By using a 1 km length of twisted fiber, we show that the effect of ellipse rotation accumulates monotonically as if the fiber were perfectly isotropic. Such behavior cannot be observed in a typical nontwisted fiber with randomly varying birefringence and is a unique feature of the twisted fiber, in which the large circular birefringence plays an essential role of preserving the handedness of elliptical polarization. We demonstrate a novel Faraday-mirror configuration to ensure automatic polarization alignment, which is directly applicable to achieving a simple and stable intensity discriminator. (c) 2006 optical Society of America.

关键词： Birefringence Mode locking nonlinear optical signal processing Polarization Polarization scattering Variable optical attenuators

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Brillouin gain-coefficient measurement for bismuth-oxide-based photonic crystal fiber under significant beam reflection at splicing points

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OPTICS LETTERS 2009年第17期34卷 2670-2672页

作者： Lee, J. H. Song, K. Y. Yoon, H. J. Kim, J. S. Hasegawa, T. Nagashima, T. Ohara, S. Sugimoto, N. Univ Seoul Sch Elect & Comp Engn Seoul 130743 South Korea Chung Ang Univ Dept Phys Seoul 156756 South Korea Korea Railroad Res Inst Ui Wang 437757 South Korea Asahi Glass Res Ctr Yokohama Kanagawa 2218755 Japan

We investigate a six-air-hole bismuth-oxide-based photonic crystal fiber (Bi-PCF) in terms of Brillouin characteristics. One huge challenge in measuring the Brillouin properties of the Bi-PCF is the nonnegligible beam reflection at the splicing points, which can be attributed to the mirroring effect caused by different refractive indices of silica and bismuth fibers. To solve the problem we propose a method that is based on the combination of a pump-probe beat lock-in scheme and a normalized gain curve-fitting technique. Using this method, successful characterization of Brillouin properties for a 1.16-m-long Bi-PCF is experimentally demonstrated. With the measured Brillouin gain coefficient and the known chi((3)) nonlinearity parameters, the Kerr nonlinearity figure-of-merit (F(nl-SBS)), including the stimulated Brillouin scattering-caused pump-power limit, is also estimated for the Bi-PCF. (C) 2009 optical Society of America

关键词： nonlinear optical signal processing optical fibers Photonic crystal fibers Reflection Refractive index Silica fibers

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