WorksheetsAttenuation in Optical Fiber
Total questions: 15
Worksheet time: 8mins
Which of the following statements best explain the concept of material absorption?
A loss mechanism related to the material composition and fabrication of fiber.
A transmission loss for optical fibers.
Results in attenuation of transmitted light.
Causes of transfer of optical power.
How many mechanisms are there which causes absorption?
1
3
2
4
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 effects of intrinsic absorption can be minimized by-
Ionization
Radiation
Suitable choice of core and cladding components
Melting
Which of the following is not a metallic impurity found in glass in extrinsic absorption?
Fe2+
Fe3+
Cu
Si
Optical fibers suffer radiation losses at bends or curves on their paths. State true or false.
True
False
How the potential macro bending losses can be reduced in case of multimode fiber?
By designing fibers with large relative refractive index differences
By maintaining direction of propagation
By reducing the bend
By operating at larger wavelengths
Sharp bends or micro bends causes significant losses in fiber. State true or false
True
False
Rayleigh scattering and Mie scattering are the types of
Linear scattering losses
Non-linear scattering losses
Fiber bends losses
Splicing losses
Dominant intrinsic loss mechanism in low absorption window between ultraviolet and infrared absorption tails is
Mie scattering
Rayleigh scattering
Stimulated Raman scattering
Stimulated Brillouin scattering
Rayleigh scattering can be reduced by operating at smallest possible wavelengths. State whether the following statement is true or false.
True
False
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
Mie scattering has in-homogeneities mainly in
Forward direction
Backward direction
All direction
Core-cladding interface
Raman and Brillouin scattering are usually observed at
Low optical power densities
Medium optical power densities
High optical power densities
Threshold power densities
High frequency optical phonon is generated in stimulated Raman scattering. State true or false
False
True
