Array-based architectures for deep-space photon counting lasercom links offer a powerful mechanism to
lower the cost and improve the scalability of Earth- or space-based optical receivers. In this architecture, a
large area receive telescope is constructed by using an array of small, inexpensive telescopes that are
networked together. However, a limitation on how many small telescopes can be used comes from the
minimum SNR requirement for synchronization. In general, the synchronization requirements are not difficult
to meet for systems with enough SNR to achieve >Mbps performance. However, deep-space links often have
large variations in their operational parameters due to varying link distances from orbital considerations as
well as atmospherics. If the system is required to operate under such stressing conditions, albeit with a low
(100's of Kbps) data rate, it is important to consider required SNR for synchronization as a design parameter.
Furthermore, for very remote systems (e.g. beyond Mars), expected data rates may only be 100's of Kbps, in
which case synchronization will be a critical design parameter. In this paper, we will examine the design trade
space between number of arrayed telescopes and synchronization parameters. We will focus on the low SNR/
low data rate case as it is the most stressing.