a transmitter module disposed within the transmitter module housing, the transmitter module having an electrical to optical converter for converting {HEAD ~ an electrical drive signal} into {TAIL ~ an optical signal} 
a transmitter module disposed within the transmitter module housing , the transmitter module having an electrical to optical converter for converting { HEAD ~ an electrical drive signal } into { TAIL ~ an optical signal }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL