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