Fiber Refractive Index Profile Measurements

Optical Communications

This set of Optical Communications Questions and Answers for Campus interviews focuses on “Fiber Refractive Index Profile Measurements”.

1. The detailed knowledge of the refractive index profile predicts the __________ of the fiber.
a) Nodal response
b) Variation in frequency
c) Impulse response
d) Amplitude

2. ______________ of the fiber is strongly dependent on the refractive index profile.
a) Amplitude
b) Tuning frequency
c) Diameter
d) Information carrying capacity

3. ______________ is required in case of graded index fibers.
a) High amplitude
b) High frequency
c) High impulse response
d) Optimum profile

4. _______________ have been widely used to determine the refractive index profiles of optical fibers.
a) Interference microscopes
b) Gyro meters
c) Mode-diameter device
d) Tunable microscopes

5. Which of the following is not an interference microscope?
a) Gerry Buzynski
b) Michelson
c) Mach-Zehnder
d) L.G. Cohen

6. What stands for x in the given equation?

δn = qλ/x

a) Displacement
b) Thickness
c) Constant
d) Coefficient of refraction

7. The ________ method gives an accurate measurement of the refractive index profile.
a) Slab
b) Biometric
d) Tuning

8. Which of the following is the main drawback of the slab technique?
a) Efficiency
b) Amplitude
c) Time
d) Accuracy

9. ________________ method is used to measure the nonlinear refractive index of the silica fiber.
a) Grating
b) Non-linear
c) Silica-refraction
d) IGA

10. Near field scanning method provides a rapid method for acquiring the refractive index profile.
a) True
b) False

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