In a polarization-multiplexing optical communications system, a method and system for coherent reception of polarization-multiplexed optical communications. The device includes internal channels that collect bubbles from fluid entering the filtration device and more efficiently direct fluid to sweep bubbles from the device during operation. Based on the first distance, a second distance from either the first terminating location or the second terminating location is determined as the wire-pull test location for testing a strength of a connection of the wire to at least one of the first terminating location or the second terminating location.