12 questions
The macroscopic bending losses show an exponential increase due to ________ in radius of curvature.
Increase
Decrease
Stability
None of the above
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
Optical fibers suffer radiation losses at bends or curves on their paths. State true or false
True
False
Stimulated emission by recombination of injected carriers is encouraged in
Semiconductor injection laser
Gas laser
Chemist laser
Dye laser
The fraction of incident photons generated by photodiode of electrons generated collected at detector is known as
Quantum efficiency
Absorption coefficient
Responsivity
Anger recombination
Quantum efficiency is a function of photon wavelength. Determine the given statement is true or false.
True
False
In photo detectors, energy of incident photons must be ________________ band gap energy
Lesser than
Greater than
Same as
Negligible
Which of the following is not a technique for fabrication of glass fibers?
Vapor phase oxidation method
Direct melt method
Lave ring method
Chemical vapor deposition technique
P2O5 is used as a _____________
Dopant
Starting material
Cladding glass
Core glass
_____________ technique is method of preparing extremely pure optical glasses.
Liquid phase (melting)
Radio frequency induction
Optical attenuation
Vapor Phase Deposition (VPD)
__________ uses flame hydrolysis stems from work on soot processes which were used to prepare the fiber with losses below 20 dB/km.
Outside vapor phase oxidation
Chemical vapor deposition
Liquid phase melting
Crystallization
Only graded index fibers are made with the help of vapor-phase deposition techniques. State whether true or false.
True
False