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Secret key exchange in ultralong lasers by radiofrequency spectrum coding

Light(Science & Applications) 2015年第1期4卷 400-404页

作者： Alessandro Tonello Alain Barthelemy Katarzyna Krupa Vincent Kermene Agnes Desfarges-Berthelemot Badr Mohamed Shalaby Sonia Boscolo Sergei K Turitsyn Juan Diego Ania-Castanon Universite de Limoges XLIMUMR CNRS 7252123 Avenue A.Thomas87060 LimogesFrance Physics Department Faculty of ScienceTanta UniversityTantaEgypt Aston Institute of Photonic Technologies Aston UniversityBirmingham B47ETUK Instituto de Optica CSICC/Serrano 121Madrid 28006Spain

We propose a new approach to the generation of an alphabet for secret key exchange relying on small variations in the cavity length of an ultralong fiber *** new concept is supported by experimental results showing how the radiofrequency spectrum of the laser can be exploited as a carrier to exchange *** test bench for our proof of principle is a 50-km-long fiber laser linking two users,Alice and Bob,where each user can randomly add an extra 1-km-long segment of *** choice of laser length is driven by two independent random binary values,which makes such length become itself a random *** security of key exchange is ensured whenever the two independent random choices lead to the same laser length and,hence,to the same free spectral range.

关键词： fiber lasers fiber optics communications optical security and encryption

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Experimental observation of topologically protected defect states in silicon waveguide arrays

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Chinese optics Letters 2020年第5期18卷 16-20页

作者： Tianying Lin Ze Chen Xiaopei Zhang He Li Xiaoping Liu Haibin Lu National Laboratory of Solid State Microstructures and College of Engineering and Applied Sciences Nanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Photonic waveguide arrays provide a simple and versatile platform for simulating conventional topological ***,we investigate a novel one-dimensional(1D)topological band structure,a dimer chain,consisting of silicon waveguides with alternating self-coupling and *** mode theory is used to study topological features of such a *** is found that topological invariants of our proposed model are described by the global Berry phase instead of the Berry phase of the upper or lower energy band,which is commonly used in the1 D topological models such as the Su–Schrieffer–Heeger ***,we design an array configuration composed of two dimer patterns with different global Berry phases to realize the topologically protected *** topologically protected propagation feature is simulated based on the finite-difference time-domain method and then observed in the *** results provide an in-depth understanding of the dynamics of the topological defect state in a 1D silicon waveguide array,and may provide different routes for on-chip lightwave shaping and routing.

关键词： fiber optics fiber optics communications fiber optics imaging

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System performance influenced by channel plan for coherent PDM-QPSK/OOK hybrid transmission systems

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Chinese optics Letters 2012年第B06期10卷 26-28页

作者：易小刚李岩伍剑徐坤洪小斌郭鸿翔林金桐 State Key Laboratory of Information Photonics and Optical Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China

The impact of channel occupancies on polarization division multiplexed quadrature phase-shift keying （PDM-QPSK）/on-off keying （OOK） hybrid systems is investigated numerically over a dispersion-managed transmission link. In addition to keep large residual dispersion per span, we find that suitable channel occupancy also help to improve the nonlinear tolerance of such hybrid systems significantly. About 2.4- dBm more nonlinear threshold （NLT） and 75% increase of transmission reach can be obtained under suitable channel plan for 112-Gb/s PDM-QPSK/OOK hybrid systems.

关键词： 060.1660 Coherent communications 060.2330 fiber optics communications 060.4510 Optical communications

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Research on characterization of frequency chirp in RSOA

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Chinese optics Letters 2013年第14期11卷 40-43页

作者：尚军芳陈健林如俭宋英雄李迎春 Key Laboratory of Specialty fiber optics and Optical Access Networks Shanghai University Shanghai 200072 China

Light chirp is a major issue in optical fiber links. This letter deals with precise characterizations of the frequency chirp parameters of reflective semiconductor optical amplifiers （RSOAs）. The RSOA chirp properties are represented by transient and adiabatic chirps, whose parameters are characterized utilizing a ratio between the phase and the amplitude modulation depths of the RSOA when modulated with sine waves. Utilizing a high-resolution optical spectrum analyzer, a RSOA linewidth enhancement factor a and an adiabatic factork are obtained experimentally, based on which the influence of chirp parameters on the transmission performance of non-return-to-zero （NRZ） signals can be analyzed.

关键词： 060.4510 Optical communications 060.2330 fiber optics communications

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