{TAIL ~ Opto isolator} that uses a nontransparent hollow tube as the optical waveguide extending between the transmitter and receiver modules of {HEAD ~ the opto isolator} 
{ TAIL ~ Opto isolator } that uses a nontransparent hollow tube as the optical waveguide extending between the transmitter and receiver modules of { HEAD ~ the opto isolator }
TAIL TAIL TAIL TAIL TAIL TAIL 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