A broadband instantaneous multi-frequency measurement system based on chirped pulse compression,which potentially has a sub-megahertz(MHz)accuracy and a hundred-gigahertz(GHz)measurement range,is demonstrated.A signal...A broadband instantaneous multi-frequency measurement system based on chirped pulse compression,which potentially has a sub-megahertz(MHz)accuracy and a hundred-gigahertz(GHz)measurement range,is demonstrated.A signalunder-test(SUT)is converted into a carrier-suppressed double-sideband(CS-DSB)signal,which is then combined with an optical linearly frequency-modulated signal having the sweeping range covering the+1 st-order sideband of the CSDSB signal.With photodetection,low-pass filtering,and pulse compression,accurate frequencies of the SUT are obtained via locating the correlation peaks.In the experiment,single-and multi-frequency measurements with a measurement range from 3 to 18 GHz and a measurement accuracy of<±100 MHz are achieved.展开更多
Stokes vectors direct detection(SV-DD)is an effective solution for short-reach optical communications.In this Letter,we investigate two-dimensional-modulation direct-detection systems based on three Stokes vector rece...Stokes vectors direct detection(SV-DD)is an effective solution for short-reach optical communications.In this Letter,we investigate two-dimensional-modulation direct-detection systems based on three Stokes vector receivers(SVRs).The influences of three key factors including the states-of-polarization(SOP),the splitting ratio of the coupler,and the excess loss(EL)are studied in detail.It is shown that the splitting ratio for achieving optimum performance will be changed with SOP and EL conditions.Among these SVRs,the3×3 coupler-based receiver with its optimal splitting ratio shows the best bit error rate performance and stability against the change of SOP.展开更多
基金国家自然科学基金(62374092、 62374092、 62004105)the Hong Kong Innovation and TechnologyFund(PRP/006/20FX)+2 种基金江苏省重点研发计划(BE2023083)镇江市社会发展性科技计划项目(FZ2022056)江苏科技大学引进人才科研启动项目(1202932206)。
基金supported in part by the Postgraduate Research and Practice Innovation Program of Jiangsu Province(No.KYLX16_0367)the National Natural Science Foundation of China(Nos.62071226 and 61971372)+1 种基金the Hong Kong Scholar Program(No.G-YZ2S)HK RGC GRF(No.15200718)。
文摘A broadband instantaneous multi-frequency measurement system based on chirped pulse compression,which potentially has a sub-megahertz(MHz)accuracy and a hundred-gigahertz(GHz)measurement range,is demonstrated.A signalunder-test(SUT)is converted into a carrier-suppressed double-sideband(CS-DSB)signal,which is then combined with an optical linearly frequency-modulated signal having the sweeping range covering the+1 st-order sideband of the CSDSB signal.With photodetection,low-pass filtering,and pulse compression,accurate frequencies of the SUT are obtained via locating the correlation peaks.In the experiment,single-and multi-frequency measurements with a measurement range from 3 to 18 GHz and a measurement accuracy of<±100 MHz are achieved.
基金supported by the National Natural Science Foundation of China(Nos.61671053,61871030,and 61435006)the Fundamental Research Funds for the Central Universities(No.FRF-BD-17-015A)+1 种基金the Foundation of Beijing Engineering and Technology Center for Convergence Networks and Ubiquitous Services,the State Key Laboratory of Advanced Optical Communication Systems Networks,China,the Hong Kong Polytechnic University(Nos.1-ZVGB,G-SB65,and 4-BCCK)the RGC of Hong Kong SAR Government(No.152248/15E)
文摘Stokes vectors direct detection(SV-DD)is an effective solution for short-reach optical communications.In this Letter,we investigate two-dimensional-modulation direct-detection systems based on three Stokes vector receivers(SVRs).The influences of three key factors including the states-of-polarization(SOP),the splitting ratio of the coupler,and the excess loss(EL)are studied in detail.It is shown that the splitting ratio for achieving optimum performance will be changed with SOP and EL conditions.Among these SVRs,the3×3 coupler-based receiver with its optimal splitting ratio shows the best bit error rate performance and stability against the change of SOP.
