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