The second optical window may be formed in a straight line with {HEAD ~ an optical input/output section} formed in the memory die and {TAIL ~ the first optical window} 
formed in
The second optical window may be formed in a straight line with { HEAD ~ an optical input / output section } formed in the memory die and { TAIL ~ the first optical window }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL