Laser Intersatellite Links in a Starlink Constellation: A Classification and Analysis

TLDR

LISLs are envisioned between satellites in upcoming constellations such as SpaceX’s Starlink phase I, where satellites can establish links with others in the same or different orbital planes. The study aims to classify LISLs by satellite location within a constellation and link duration. Using the Starlink phase I constellation, the authors analyze how varying a satellite’s LISL range affects the number of different LISL types it can establish. They find that, besides permanent links, a substantial number of temporary LISLs occur between satellites in crossing orbital planes, enabling low‑latency paths in future optical wireless satellite networks.

Abstract

Laser intersatellite links (LISLs) are envisioned between satellites in upcoming satellite constellations, such as the one in phase I of SpaceX's Starlink. Within a constellation, satellites can establish LISLs with other satellites in the same orbital plane (OP) or in different OPs. We present a classification of LISLs based on the location of satellites within a constellation and of LISLs' duration. Then, using the satellite constellation for phase I of Starlink, we study the effect that varying a satellite's LISL range has on the number of different types of LISLs it can establish with other satellites. In addition to permanent LISLs, we observe a significant number of temporary LISLs between satellites in crossing OPs. Such LISLs can play a vital role in achieving low-latency paths within next-generation optical wireless satellite networks.