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| 1 | Single-End Adaptive Optics Compensation for Emulated Turbulence in a Bi-Directional 10-Mbit/s per Channel Free-Space Quantum Communication Link Using Orbital-Angular-Momentum Encoding显示文摘A single-end adaptive-optics(AO)module is experimentally demonstrated to mitigate the emulated atmospheric turbulence efects in a bi-directional quantum communication link,which employs orbital angular momentum(OAM)for data encoding.A classical Gaussian beam is used as a probe to detect the turbulence-induced wavefront distortion in the forward direction of the link.Based on the detected wavefront distortion,an AO system located on one end of the link is used to simultaneously compensate for the forward and backward channels.Specifcally,with emulated turbulence and when the probe is turned on,the mode purity of photons carrying OAMℓ=1 is improved by∼21%with AO mitigation.We also measured the performance when encoding data using OAM{ℓ=−1,+2}and{ℓ=−2,+1}in the forward and backward channels,respectively,at 10 Mbit/s per channel with one photon per pulse on average.For this case,we found that the AO system could reduce the turbulence efects increased quantum-symbolerror-rate(QSER)by∼76%and∼74%,for both channels in the uni-directional and bi-directional cases,respectively.Similar QSER improvement is observed for the opposite direction channels in the bi-directional case. | Cong Liu Kai Pang Zhe Zhao Peicheng Liao Runzhou Zhang Haoqian Song Yinwen Cao Jing Du Long Li Hao Song Yongxiong Ren Guodong Xie Yifan Zhao Jiapeng Zhao Seyed M.H.Rafsanjani Ari N.Willner Jeffrey H.Shapiro Robert W.Boyd Moshe Tur Alan E.Willner | 2019 | Research2019，，1： | 3 |
| 2 | Orbital-angular-momentum-based reconfigurable optical switching and routing显示文摘Orbital angular momentum(OAM) has gained interest due to its potential to increase capacity in optical communication systems as well as an additional domain for reconfigurable networks. This is due to the following:(i) coaxially propagated OAM beams with different charges are mutually orthogonal,(ii) OAM beams can be efficiently multiplexed and demultiplexed, and(iii) OAM charges can be efficiently manipulated. Therefore, multiple data-carrying OAM beams could have the potential capability for reconfigurable optical switching and routing. In this paper, we discuss work involving reconfigurable OAM-based optical add/drop multiplexing, space switching,polarization switching, channel hopping, and multicasting. | Alan E.Willner Long Li Guodong Xie Yongxiong Ren Hao Huang Yang Yue Nisar Ahmed Moshe J.Willner Asher J.Willner Yan Yan Zhe Zhao Zhe Wang Cong Liu Moshe Tur Solyman Ashrafi | 2016 | Photonics Research2016，4，5： | 2 |
| 3 | Tunable sharp and highly selective microwave-photonic band-pass filters based on stimulated Brillouin scattering显示文摘Stimulated Brillouin scattering(SBS)in optical fibers has long been used in frequency-selective optical signal processing,including in the realization of microwave-photonic(MWP)filters.In this work,we report a significant enhancement in the selectivity of SBS-based MWP filters.Filters having a single passband of 250 MHz–1 GHz bandwidth are demonstrated,with selectivity of up to 44 dB.The selectivity of the filters is better than that of the corresponding previous arrangements by about 15 dB.The shape factor of the filters,defined as the ratio between their−20 dB bandwidth and their−3 dB bandwidth,is between 1.35 and 1.5.The central transmission frequency,bandwidth,and spectral shape of the passband are all independently adjusted.Performance enhancement is based on two advances,compared with previous demonstrations of tunable SBS-basedMWPfilters:(a)the polarization attributes of SBS in standard,weakly birefringent fibers are used to discriminate between in-band and out-of-band components and(b)a sharp and uniform power spectral density of the SBS pump waves is synthesized through external modulation of an optical carrier by broadband,frequency-swept waveforms.The signal-to-noise ratio of filtered radio-frequency waveforms and the linear dynamic range of the filters are estimated analytically and quantified experimentally.Lastly,a figure of merit for the performance of the filters is proposed and discussed.The filters are applicable to radio-over-fiber transmission systems. | Yonatan Stern Kun Zhong Thomas Schneider Ru Zhang Yossef Ben-Ezra Moshe Tur Avi Zadok | 2014 | Photonics Research2014，2，4： | 2 |
| 4 | Digital signal processing for an open-loop fiber-optic gyroscope 显示文摘 | GRONAU Yuval TUR Moshe | 1995 | Applied Optics1995，34，25： | 1 |
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