Top 150+ Solved Optical Communication MCQ Questions Answer
Q. is used when the optical emission results from the application of electric field.
a. radiation
b. efficiency
c. electro-luminescence
d. magnetron oscillator
Q. Which impurity is added to gallium phosphide to make it an efficient light emitter?
a. silicon
b. hydrogen
c. nitrogen
d. phosphorus
Q. Population inversion is obtained at a p-n junction by
a. heavy doping of p-type material
b. heavy doping of n-type material
c. light doping of p-type material
d. heavy doping of both p-type and n-type material
Q. The system is best developed and is used for fabricating both lasers and LEDs for the shorter wavelength region.
a. inp
b. gasb
c. gaas/gasb
d. gaas/alga as dh
Q. As compared to planar LED structure, Dome LEDs have External power efficiency effective emission area and radiance.
a. greater, lesser, reduced
b. higher, greater, reduced
c. higher, lesser, increased
d. greater, greater, increased
Q. In surface emitter LEDs, more advantage can be obtained by using
a. bh structures
b. qc structures
c. dh structures
d. gain-guided structure
Q. Internal absorption in DH surface emitter Burros type LEDs is
a. cannot be determined
b. negligible
c. high
d. very low
Q. DH surface emitter generally give
a. more coupled optical power
b. less coupled optical power
c. low current densities
d. low radiance emission into-fiber