Week 8

On this week, i did some study on the effect of bending for optical loop fiber. This matter is count to be very important as excessive bending causes optical signal to refract and escape the core and the cladding. Hence, there will be in increase of attenuation and interference light transmission happen.

There are calculation that can be done to avoid such problem. In order to prevent excessive bending or breakage to the fiber, the maximum bending radius or limit of radius must be equal to 10 times the diameter of the core. The best is to avoid tension and exhibit failure. So, the minimum bending radius must be 20 times the diameter of the core. For an example;

Here, we have the diameter of the cable under test (with cladding) is 125um. Hence, 

- the maximum radius bending, Rmax = 10 x 125um = 1.25mm

- the minimum radius bending, Rmin = 20 x 125um = 2.50mm

In conclusion, the optical loop fiber under test should be using a bigger diameter than the calculated maximum and minimum bending radius.