Issue 76

Chinese Satellite Achieves High-Speed Space-to-Ground Laser Comms

3 Jul 2023: Chang Guang (CGST), a Chinese satellite operator of the Jilin Earth Observation constellation, successfully achieved 10 Gbps satellite-to-ground laser communication via a Jilin-1 satellite. The downlink speed surpassed a previous record of 1 Gbps via radio frequency connectivity. The first laser…

3 Jul 2023: Chang Guang (CGST), a Chinese satellite operator of the Jilin Earth Observation constellation, successfully achieved 10 Gbps satellite-to-ground laser communication via a Jilin-1 satellite. The downlink speed surpassed a previous record of 1 Gbps via radio frequency connectivity. The first laser demonstration downlink included a satellite picture of Doha, Qatar.

CGST carried out the test with its Jilin-1 MF02A04 remote sensing satellite. The test was conducted in cooperation with the Aerospace Information Research Institute (AIR) of the Chinese Academy of Sciences (CAS).

-Chen Shanbo, chief designer of Jilin-1 MF02A04, said in a statement that the test was the first ultra-high-speed (10Gbps) for commercial applications in China, and signals numerous breakthroughs in key technologies.

-Jilin-1 MF02A04 was launched on 15 January 2023 with 13 other satellites including MF02A03 and MF02A07.

-The breakthrough could enable China to increase its transmission rates as the number of planned low Earth orbit constellations grows. With the additional use of inter-satellite laser links, this could help China overcome some of the challenges of a relatively lower level of global ground station infrastructure.

-The success of China’s recent space-to-ground laser communication experiment has set the stage for the subsequent large-scale application of 40 Gbps satellite-to-ground laser communication payloads.

-In addition to faster data transmission rates, lasers provide additional security, owing to their strong anti-electromagnetic interference capabilities.

Jilin-1 MF02A04 laser-communication demonstration image of Doha, Qatar.

Optical and radio-frequency beam waveforms comparing data volume per link.

Benefits of laser communications: higher efficiency, lighter systems, increased security, and flexible ground systems.