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

作　　者：Yannik Horst Bertold Ian Bitachon Laurenz Kulmer Jannik Brun Tobias Blatter Jean-Marc Conan Aurélie Montmerle-Bonnefois Joseph Montri Béatrice Sorrente Caroline B.Lim Nicolas Védrenne Daniel Matter Loann Pommarel Benedikt Baeuerle Juerg Leuthold 

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

出　　处：《Light(Science & Applications)》2023年第9期1727-1738,共12页光（科学与应用)（英文版）

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 

分 类 号：TN9[电子电信—信息与通信工程]