Top 150+ Solved Broadband Communication Systems MCQ Questions Answer
Q. Self-phase modulation can be used for
a. enhancing the core diameter
b. wavelength shifting
c. decreasing the attenuation
d. reducing the losses in the fiber
Q. The beating between light at different frequencies or wavelengths in multichannel fiber transmission causes
a. attenuation
b. amplitude modulation of channels
c. phase modulation of channels
d. loss in transmission
Q. What is different in case of cross-phase modulation from self-phase modulation?
a. overlapping but same pulses
b. overlapping but distinguishable pulses
c. non-overlapping and same pulses
d. non-overlapping but distinguishable pulses
Q. When three wave components co-propagate at angular frequency w1, w2, w3, then a new wave is generated at frequency w4, which is given by
a. w4 = w1-w2-w3
b. w4 =w1+w2+w3
c. w4 =w1+w2-w3
d. w4 =w1-w2+w3
Q. _____________ results from case of nonlinear dispersion compensation in which the nonlinear dispersion compensation in which the nonlinear dispersion compensation in which the nonlinear chirp caused by self-phase modulation balances, postpones, the temporal broadening induced by group velocity delay.
a. four wave mixing
b. phase modulation
c. soliton propagation
d. raman scattering
Q. What is a fundamental necessity in the fabrication of fibers for light transmission?
a. same refractive index for both core and cladding.
b. pump source
c. material composition of fiber
d. variation of refractive index inside the optical fiber
Q. Which materials are unsuitable for the fabrication of graded index fiber?
a. glass-like-materials
b. mono-crystalline structures
c. amorphous material
d. silica based material
Q. What is the first stage in liquid-phase-technique?
a. preparation of ultra-pure material powders
b. melting of materials
c. decomposition
d. crystallization
Q. Which processes are involved in the purification stage in liquid-phase-technique?
a. filtration, co-precipitation, re-crystallization
b. decomposition, filtration, drying
c. doping, drying, decomposition
d. filtration, drying, doping
Q. At what temperature range, does the melting of multi components glass systems takes place?
a. 100-300 degree celsius
b. 600-800 degree celsius
c. 900-1300 degree celsius
d. 1500-1800 degree celsius
Q. An Si-O bond with a Young’s modulus of 9*1010Nm-1 have an elliptical crack of depth 7nm. The surface energy is 2.29 J. Estimate fracture stress for silica fiber.
a. 4.32*109nm-1
b. 6.32*109nm-1
c. 5.2*109nm-1
d. 3*109nm-1
Q. Calculate percentage strain at break for a Si-O bond with a fracture strength of 3.52*1010Nm-1 and Young’s modulus of 9 *109Nm-1.
a. 3.1 %
b. 2.8 %
c. 4.5 %
d. 3.9 %
Q. The ratio r = (n1 – n)/ (n1 – n) indicates
a. fresnel reflection
b. reflection coefficient
c. refraction coefficient
d. angular power distribution coefficient