41. What is the numerical aperture of the fiber if the angle of acceptance is 16 degree?
42. Rayleigh scattering can be reduced by operating at smallest possible wavelengths.
43. Intermodal dispersion occurring in a large amount in multimode step index fiber results in . . . . . . . .
44. A graded-index fiber has a core with parabolic refractive index profile of diameter of 30μm, NA=0.2, λ=1μm. Estimate the normalised frequency.
45. The dispersion due to material, waveguide and profile are -2.8nm-1km-1, 20.1nm-1km-1 and 23.2nm-1km-1 respectively. Find the total first order dispersion?
46. When two components are equally excited at the fiber input, then for polarization maintaining fibers δΓg should be around . . . . . . . .
47. 3dB optical bandwidth is always . . . . . . . the 3dB electrical bandwidth.
48. What is needed to predict the performance characteristics of single mode fibers?
49. The beat length in a single mode optical fiber is 8 cm when light from a laser with a peak wavelength 0.6μm is launched into it. Estimate the modal birefringence.
50. The difference between the modes' refractive indices is called as . . . . . . . .
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