A coupler includes a coupler body having a first mating end defining a first mating interface configured for mating with a first mating connector and a second mating end defining a second mating interface configured for mating with a second mating connector. A contact sub-assembly is received within the coupler body, wherein the contact sub-assembly has first contacts grouped in differential pairs and presented at the first mating end and second contacts grouped in differential pairs and presented at the second mating end. At least one shielding member is located within the coupler body, wherein the at least one shielding member isolates each differential pair of first contacts from an adjacent differential pair of the first contacts.