w sub s 1 8 2 0 2 2 2 3 2 5 2 2 2 2 2 2 2 2 mm groove depth d sub s 2 4 2 4 2 4 2 4 2 4 2 0 2 2 2 6 2 8 mm groove pitch 700 mm central tensile 7 1 0 stranded steel wiresstrength member__________________________________________________________________________ the tape shaped optical fiber bundles used are gi type having a width w t 1 6 mm and a thickness t 0 42 mm and each bundle has five optical fibers four of these bundles were stacked on top of each other during the experiments the tests performed on these cables and the results of these tests are listed in table 2 table 2__________________________________________________________________________ optical unit no test item test condition 1 2 3 4 5 6 7 8 9__________________________________________________________________________were the tape bending diameter no no no no yes no no no yesshaped optical 200 mm u03c6 fiber lines bending 180 u00b0 in oppositedisordered when directions ten times bent maximum bending diameter 300 mm u03c6 0 2 0 05 0 0 0 0 0 0 0increase in bending 180 u00b0 in opposite db dbtransmission directions five times loss caused by transmission loss monitor bending applied to the first through fifth optical fibers in no.