FIBER OPTICS

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)