High density optical transceiver assembly

A transceiver assembly for mounting on a mother board, said transceiver assembly comprising: (a) a frame defining a first plane configured for mounting parallel to said motherboard, said frame defining a plurality of slots perpendicular to said first plane; and (b) one or more opto-electric cards, each of said one or more opto-electric cards disposed in one of said plurality of slots and comprising at least, (i) a substrate having a first edge parallel to said first plane when said opto-electric card is mounted in said slot, (ii) an electrical interface along said first edge, (iii) and an interposer electrically connected to said electrical interface and comprising at least one optical component operatively connected to said electrical interface, and (iv) at least one optical fiber extending freely from said interposer.