Further, it will be understood that the optical couplers not only can be used to connect to external devices in {TAIL ~ the plane} of {HEAD ~ the chip}, but with three dimensional optical couplers such external optical devices can be positioned within a semispherical volume above the chip 
Further , it will be understood that the optical couplers not only can be used to connect to external devices in { TAIL ~ the plane } of { HEAD ~ the chip } , but with three dimensional optical couplers such external optical devices can be positioned within a semispherical volume above the chip
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH