The European Data Relay System, high speed laser based data links

Investigation of coherent receiver designs in high-speed optical inter-satellite links using digital signal processing

“…DAC/ADC bandwidth, and since space-qualified DSP for OISL is much slower, we set the symbol rate to 1 GS/s in order to get a more realistic scenario. Current OISL systems achieve data rates between 1 to 6 Gbps [1,2]. Our simulation setup is similar to the experimental setup.…”

“…However, the very high transmission distances necessitate an optical receiver design enabling high receiver sensitivity which requires careful carrier synchronization and a quasi-coherent detection scheme. In state of the art systems a homodyne detection scheme uses an optical phase-locked loop (OPLL), to adjust the frequency and phase of the local laser to the incoming signal [1,2]. However, the OPLL hardware complexity increases with the modulation order.…”

Sensitivity modeling of binary optical receivers

“…Timely examples of such links can be found in the domain of optical space relays and space-to-ground links. For this scenario, NASA is currently developing technology based on preamplified differential phase-shift keying (DPSK) at a wavelength of 1550 nm [6], whereas ESA is implementing the European Data Relay System (EDRS) based on homodyne binary phase-shift keying (BPSK) at 1064 nm [7,8].…”

A novel routing design in the IP-based GEO/LEO hybrid satellite networks

“…The GEO satellite network, which employs fewer satellites and simple geometry compared with that of the MEO satellite network, could act the critical relay layer, which bridges the LEO satellite network and the ground control center. It should be noted that the European Data Relay System [13][14][15][16] employs the GEO satellites for the real-time relay of the huge data from the LEO satellites. This paper thus focuses on the GEO/LEO hybrid satellite network.With the ongoing advancements of the key technologies required for the support of the future broadband satellite communication, for example, the optical satellite communications, on-board processing and on-board switching, it is now technologically viable to design and implement the satellite communication system to provide the multimedia services.…”

“…The GEO satellite network, which employs fewer satellites and simple geometry compared with that of the MEO satellite network, could act the critical relay layer, which bridges the LEO satellite network and the ground control center. It should be noted that the European Data Relay System [13][14][15][16] employs the GEO satellites for the real-time relay of the huge data from the LEO satellites. This paper thus focuses on the GEO/LEO hybrid satellite network.…”