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Tbit/s line-rate satellite feeder links enabled by coherent modulation and full-adaptive optics

查看全文 作　　者：Yannik [1]Horst;Bertold Ian [1]Bitachon;Laurenz [1]Kulmer;Jannik [1]Brun;Tobias [1]Blatter;Jean-Marc [2]Conan;Aurélie Montmerle-[2]Bonnefois;Joseph [2]Montri;Béatrice [2]Sorrente;Caroline [2,5]B.Lim;Nicolas [2]Védrenne;Daniel [3]Matter;Loann [3]Pommarel;Benedikt [1,4]Baeuerle;Juerg [1,4]Leuthold 高影响力作者 机构地区：[1]ETH Zurich,Institute of Electromagnetic Fields(IEF),Gloriastrasse 35,8092 Zürich,Switzerland;[2]ONERA,DOTA,Paris Saclay University,F-92322 Châtillon,France;[3]Thales Alenia Space in Switzerland,Schaffhauserstrasse 580,8052 Zürich,Switzerland;[4]Polariton Technologies AG,8803 Rüschlikon,Switzerland;[5]Present address:Currently with LNE-SYRTE,Observatoire de Paris,Paris,France高影响力机构 出　　处：《Light(Science & Applications)》索引2023年第12卷第9期,共12页高影响力期刊 基　　金：The project is financed by the H2020 EU Project VERTIGO(Grant Nr.822030)。 摘　　要：Free-space optical(FSO)communication technologies constitute a solution to cope with the bandwidth demand of future satellite-ground networks.They may overcome the RF bottleneck and attain data rates in the order of Tbit/s with only a handful of ground stations.Here,we demonstrate single-carrier Tbit/s line-rate transmission over a free-space channel of 53.42 km between the Jungfraujoch mountain top(3700 m)in the Swiss Alps and the Zimmerwald Observatory(895 m)near the city of Bern,achieving net-rates of up to 0.94 Tbit/s.With this scenario a satellite-ground feeder link is mimicked under turbulent conditions.Despite adverse conditions high throughput was achieved by employing a full adaptive optics system to correct the distorted wavefront of the channel and by using polarization-multiplexed high-order complex modulation formats.It was found that adaptive optics does not distort the reception of coherent modulation formats.Also,we introduce constellation modulation–a new four-dimensional BPSK(4D-BPSK)modulation format as a technique to transmit high data rates under lowest SNR.This way we show 53 km FSO transmission of 13.3 Gbit/s and 210 Gbit/s with as little as 4.3 and 7.8 photons per bit,respectively,at a bit-error ratio of 1∙10−3.The experiments show that advanced coherent modulation coding in combination with full adaptive optical filtering are proper means to make next-generation Tbit/s satellite communications practical. 关 键 词：Tbit/s Gbit/s POLARIZATION
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