Top 150+ Solved Optical Communication MCQ Questions Answer
Q. In a multimode fiber, much of light coupled in the fiber from an LED is
a. increased
b. reduced
c. lost
d. unaffected
Q. Mesa structured SLEDs are used
a. to reduce radiance
b. to increase radiance
c. to reduce current spreading
d. to increase current spreading
Q. The InGaAsP is emitting LEDs are realized in terms of restricted are
a. length strip geometry
b. radiance
c. current spreading
d. coupled optical power
Q. A device which converts electrical energy in the form of a current into optical energy is called as
a. optical source
b. optical coupler
c. optical isolator
d. circulator
Q. Which process gives the laser its special properties as an optical source?
a. dispersion
b. stimulated absorption
c. spontaneous emission
d. stimulated emission
Q. An incandescent lamp is operating at a temperature of 1000K at an operating frequency of 5.2×1014 Hz. Calculate the ratio of stimulated emission rate to spontaneous emission rate.
a. 3×10-13
b. 1.47×10-11
c. 2×10-12
d. 1.5×10-13
Q. The lower energy level contains more atoms than upper level under the conditions of
a. isothermal packaging
b. population inversion
c. thermal equilibrium
d. pumping
Q. in the laser occurs when photon colliding with an excited atom causes the stimulated emission of a second photon.
a. light amplification
b. attenuation
c. dispersion
d. population inversion
Q. A semiconductor laser crystal of length 5 cm, refractive index 1.8 is used as an optical source. Determine the frequency separation of the modes.
a. 2.8 ghz
b. 1.2 ghz
c. 1.6 ghz
d. 2 ghz
Q. is essentially a crude form of Amplitude shift keying.
a. analog modulation
b. digital intensity modulation
c. photodetector
d. receiver structure