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Home : Home : Warfare Centers : NSWC Dahlgren : What We Do : Navy Shipboard Fiberoptics : Policy and Guidance : OFCC Susecptibility Test

The OFCC shall be tested in a free loop using the procedure in IEC 749-I-E10. Three test specimens shall be tested from each fiber on each end of the cable. The free standing loop diameter shall be measured in a directing parallel to that in which the forces are applied at the bottom of the free standing loop.

Test on each specimen shall be terminated when either a kink is formed or when one half the minimum bend diameter is reached. The free form loop diameter in which the first noticable detrimental effect occurs is to be recorded along with the effect.

A post test visual inspection shall reveal no kinking, cracking, splitting, tearing, collapsing or other type deformation of the OFCC jacket for free form loop diameter at or above the minimum short term bend diameter fo the OFCC.

Test Method IEC 794-1-E10


The purpose of this test is to verify whether kinking of an optical cable results in breakage of any optical fiber in the cable. Depending on the rigidity of the cable sheath, fiber breakage can occur when a loop is formed of dimension small enough to induce a kink in the sheath.


A length of about 10 times the minimum bending radius of the cable shall be taken.


The sample shall be held in both hands. A loop (1) shall be made (see Figure 10). The diameter of the loop shall be reduced to the minimum value as specified in the detail specification by pulling slowly on the two ends (2). The forces at the bottom of the loop shall be applied in one plane.

The temperature of the sample is given in the detail specification.


No kink (3), as shown in Figure 10, shall occur.


Last Updated: 1/05/05