Free-space optical communication(FSOC)enables high-speed,secure,and scalable data transmission,with great potential for space–ground networks.However,existing FSOC systems predominantly employ point-to-point transmit...Free-space optical communication(FSOC)enables high-speed,secure,and scalable data transmission,with great potential for space–ground networks.However,existing FSOC systems predominantly employ point-to-point transmitters,each requiring bulky beam steering devices with complex control mechanisms,which severely limits their feasibility for multi-node micro-platform applications.Here,to address such a challenge,we propose a novel point-to-multipoint FSOC scheme based on reconfigurable SiC gratings,which are directly fabricated in stretchable PDMS films via femtosecond laser-induced carbide precipitation.The reconfigurable SiC transmission gratings are with good transparency(~91.9%at 1550 nm),dynamic beam steering capability(hundred-milliradian level),and an ultralightweight design(single grating:0.4 g).The SiC fringes are specially fabricated within the internally symmetric region of the PDMS film to mitigate the structure distortion during stress regulation,significantly enhancing the long-range transmission capability in degraded atmospheric channels.The system supports 1-to-7 and 1-to-9 dynamic optical communication for 1D and 2D configurations,respectively.In a state-of-the-art 225-meter outdoor experiment,the system achieves reliable 10 Gbps transmission for each node.This portable FSOC system overcomes the limitations of conventional systems,enabling scalable and flexible multibeam steering.This approach establishes a robust foundation for long-range,multinode,and high-capacity FSOC networks among spatial micro-platforms such as unmanned aerial vehicles and micro-satellites.展开更多
基金supported by the National Natural Science Foundation of China(U2141231,62275100,T2325014)Natural Science Foundation of Jilin Province(20240101020JJ)+1 种基金Natural Science Foundation of Chongqing Municipality(CSTB2023NSCQ-MSX0030)National Ten Thousand Talent Program for Young Top-notch Talents.
文摘Free-space optical communication(FSOC)enables high-speed,secure,and scalable data transmission,with great potential for space–ground networks.However,existing FSOC systems predominantly employ point-to-point transmitters,each requiring bulky beam steering devices with complex control mechanisms,which severely limits their feasibility for multi-node micro-platform applications.Here,to address such a challenge,we propose a novel point-to-multipoint FSOC scheme based on reconfigurable SiC gratings,which are directly fabricated in stretchable PDMS films via femtosecond laser-induced carbide precipitation.The reconfigurable SiC transmission gratings are with good transparency(~91.9%at 1550 nm),dynamic beam steering capability(hundred-milliradian level),and an ultralightweight design(single grating:0.4 g).The SiC fringes are specially fabricated within the internally symmetric region of the PDMS film to mitigate the structure distortion during stress regulation,significantly enhancing the long-range transmission capability in degraded atmospheric channels.The system supports 1-to-7 and 1-to-9 dynamic optical communication for 1D and 2D configurations,respectively.In a state-of-the-art 225-meter outdoor experiment,the system achieves reliable 10 Gbps transmission for each node.This portable FSOC system overcomes the limitations of conventional systems,enabling scalable and flexible multibeam steering.This approach establishes a robust foundation for long-range,multinode,and high-capacity FSOC networks among spatial micro-platforms such as unmanned aerial vehicles and micro-satellites.
