CEC 357 UNDERWATER WIRELESS COMMUNICATION

A silica optical fiber with a large core diameter has a core refractive index of 1.5 and a Cladding refractive index of 1.47. Determine the acceptance angle in air for the fiber.

A silica optical fiber with core diameter large enough to be considered by Ray theory has a core refractive index of 1.5 and cladding refractive index of 1.47.Determine numerical aperture.

calculate the cut off wavelength of a single mode fibre with core radius of 4 m and index difference= 0.003

The significance of fourth generation optical communication system is

• Optical amplifier

• Optical source

• Optical coupler

• splicers

A multimode step index fiber has a normalized frequency of 72. Estimate the number of guided modes.

• 2846

• 2592

• 2432

• 2136

An optical fiber has core-index of 1.480 and a cladding index of 1.478. What should be the core size for single mode operation at 1310nm?

• 7.31μm

• 8.71μm

• 5.26μm

• 6.50μm

A multimode fiber has refractive indices n1 = 1.15, n2 = 1.11 and an operating wavelength of 0.7μm. Find the radius of curvature?

• 8.60μm

• 9.30μm

• 9.1μm

• 10.2μm

Absorption losses due to atomic defects mainly include ___________

• Radiation

• Missing molecules, oxygen defects in glass

• Impurities in fiber material

• Interaction with other components of core

The scattering resulting from fiber imperfections like core-cladding RI differences, diameter fluctuations, strains, and bubbles is?

• Rayleigh scattering

• Mie scattering

• Stimulated Brillouin scattering

• Stimulated Raman scattering

Consider a single mode fiber having core refractive index n1= 1.5. The fiber length is 12m. Find the time taken by the axial ray to travel along the fiber

• 1.00μsec

• 0.06μsec

• 0.90μsec

• 0.30μsec