  We report the development of a mid-board, TOSA and ROSA based miniature dual
channel optical transmitter (MTx) and a transceiver (MTRx). The design
transmission data rate is 5.12 Gbps per channel and receiving data rate 4.8
Gbps. MTx and MTRx are only 6 mm tall and are electrically and optically
pluggable. Although the fiber TOSA/ROSA coupling is through a custom latch, the
fiber uses the standard LC ferrule, flange and spring. Light coupling is
ensured by the TOSA and ROSA with the LC coupling mechanism. With the dual
channel serializer LOCx2 sits under MTx, one achieves high data transmission
with a small PCB footprint, and enjoys the reliability of the hermetically
packaged TOSA. MTx and MTRx are designed for detector front-end readout of the
ATLAS Liquid Argon Calorimeter (LAr) trigger upgrade.
