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