The housing, which installs the OSAs, the optical member and the inner fiber, is made of metal and has {TAIL ~ a grooves} into which {HEAD ~ the inner fibers} is set so as to arrange them orderly 
into is set
The housing , which installs the OSAs , the optical member and the inner fiber , is made of metal and has { TAIL ~ a grooves } into which { HEAD ~ the inner fibers } is set so as to arrange them orderly
OTH 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 REL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH