Top 150+ Solved Broadband Communication Systems MCQ Questions Answer
Q. Calculate the splitting loss if a 30×30 port multimode fiber star coupler has 1 mW of optical power launched into an input port.
a. 13 db
b. 15 db
c. 14.77 db
d. 16.02 db
Q. 14. A _____________ coupler comprises a number of cascaded stages, each incorporating three or four-port FBT couplers to obtain a multiport output.
a. star
b. ladder
c. wdm
d. three-port
Q. A number of three-port single-mode fiber couplers are used in the fabrication of a ladder coupler with 16 output ports. The three-port couplers each have an excess loss of 0.2 dB along with a splice loss of 0.1 dB at the interconnection of each stage. Determine the excess loss.
a. 1.9 db
b. 1.4 db
c. 0.9 db
d. 1.1 db
Q. It is a passive device which allows the flow of optical signal power in only one direction and preventing reflections in the backward direction.
a. fiber slice
b. optical fiber connector
c. optical isolator
d. optical coupler
Q. Which feature of an optical isolator makes it attractive to use with optical amplifier?
a. low loss
b. wavelength blocking
c. low refractive index
d. attenuation
Q. ____________________ lasers are presently the major laser source for optical fiber communications
a. semiconductor
b. non-semiconductor
c. injection
d. solid-state
Q. In Nd: YAG lasers, the maximum doping levels of neodymium is ____________
a. 0.5 %
b. 1.5 %
c. 1.8 %
d. 2 %
Q. Which of the following is not a property of Nd: YAG laser that enables its use as an optical fiber communication source?
a. single mode operation
b. narrow line-width
c. long lifetime
d. semiconductors and integrated circuits
Q. The Nd: YAG laser has a narrow line-width which is ________________
a. < 0.01 nm
b. > 0.01 nm
c. > 1 mm
d. > 1.6 mm
Q. The strongest pumping bands is a four level system of Nd: YAG laser at wavelength of range_________________
a. 0.25 and 0.56 nm
b. 0.75 and 0.81 nm
c. 0.12 and 0.23 nm
d. 1 and 2 nm
Q. The phenomenon occurring when the electron and photon population within the structure comes into equilibrium is known as
a. auger recombination
b. inter-valence band absorption
c. carrier leakage
d. relaxation oscillations
Q. When a current pulse reaches a laser having parasitic capacitance after the initial delay time, that pulse will
a. have no effect
b. will get vanished
c. becomes narrower
d. gets broader
Q. Reducing delay time and ____________ are of high importance for lasers.
a. auger recombination
b. inter-valence band absorption
c. carrier leakage effects
d. relaxation oscillations
Q. Dynamic line-width broadening under the direct modulation of injection current is known as
a. auger recombination
b. inter-valence band absorption
c. carrier leakage effects
d. frequency chirping