Question

If parabolic profile is used for refractive index in the core, what is the name given to such core?

• A. single mode core
• B. multi mode core
• C. differential mode core
• D. curvilinear differential core

Answer 1

The correct option is D curvilinear differential core

Optical fibers work on the phenomenon of total internal reflection inside the fiber tube. Thin fiber tubes carry optical images to large distances,around 100 km.

The losses in the fiber is due to Raman scattering, polarization and diffraction. The loss due to diffraction can be minimized by using differential cores, that is, by having varying refractive index along the radial direction.

When these cores are parabolic, the loss is least. Such cores are called curvilinear differential cores.