An apparatus comprising a cage for pluggable optical modules including a bay having a first port stacked with a second port, the bay having an opening between the first and second port; a heat collector module in the opening comprising a first contact plate adjacent to the first port bottom and provided in the first port and configured to contact a first optical module in the first port, a second contact plate adjacent to the second port top and provided in the second port and configured to contact a second optical module insertable in the second port, a cold plate between the first and second contact plates, compressible thermal material layers between the contact plates and the cold plate; and a heat pipe having a first portion in thermal contact with the cold plate and a second portion extending beyond the stacked cage and in thermal contact with a radiator.