[Solved] The difference between the modes’ refractive indices is called as

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Q.	The difference between the modes’ refractive indices is called as
A.	polarization
B.	cutoff
C.	fiber birefringence
D.	fiber splicing
Answer» C. fiber birefringence
Explanation: there are two propagation modes in single mode fibers. these two modes are similar but their polarization planes are orthogonal. in actual fibers, there are imperfections such as variations in refractive index profiles. these modes propagate with different phase velocities and their difference is given by bf =ny – nx. here, ny and nx are refractive indices of two modes.

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