  Laser inter-satellite links (LISLs) are envisioned between satellites in
upcoming satellite constellations, such as Phase I of SpaceX's Starlink. Within
a constellation, satellites can establish LISLs with other satellites in the
same orbital plane or in different orbital planes. We present a classification
of LISLs based on the location of satellites within a constellation and the
duration of LISLs. Then, using satellite constellation for Phase I of Starlink,
we study the effect of varying a satellite's LISL range 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 orbital planes. Such LISLs can play a vital role in
achieving low-latency paths within next-generation optical wireless satellite
networks.
