High density optical transceiver

The invention relates to a high density small form factor opto-electronic transceiver system in which the module housing and guide rail from a large form factor transceiver system, e.g. an X2 transceiver, are used to house a plurality of small form factor transceivers. Ideally up to four independently functioning pluggable small form factor transceivers are plugged into the module housing of the larger form factor transceiver, which has been modified to form a shell. The shell houses a printed circuit board, which has a plurality of electrical connectors on one end for receiving the transceivers, and a single electrical connector on the other end for plugging into a host system.