Top 150+ Solved Broadband Communication Systems MCQ Questions Answer
Q. Which of the following does not provide single frequency operation?
a. short cavity resonator
b. dsm lasers
c. coupled cavity resonator
d. fabry-perot resonator
Q. The semiconductor lasers employing the distributed feedback mechanism are classified in _________________ categories
a. one
b. two
c. three
d. four
Q. DBF-BH lasers exhibit low threshold currents in the range of ________________
a. 40 to 50 ma
b. 21 to 30 ma
c. 2 to 5 ma
d. 10 to 20 ma
Q. The narrow line-width obtained under the CW operation for quarter wavelength shifted DFB laser is ________________
a. 2 mhz
b. 10 mhz
c. 3 mhz
d. 1 mhz
Q. Line-width narrowing is achieved in DFB lasers by a strategy referred as _______________
a. noise partition
b. grating
c. tuning
d. bragg wavelength detuning
Q. _________________ is a technique used to render the non-conducting material around the active cavity by producing permanent defects in the implanted area
a. dispersion
b. ion de-plantation
c. ion implantation
d. attenuation
Q. The threshold temperature coefficient for InGaAsP devices is in the range of
a. 10-40 k
b. 40-75 k
c. 120-190 k
d. 150-190 k
Q. The process where the energy released during the recombination of an electron-hole event getting transferred to another carrier is known as
a. inter-valence bond absorption
b. auger recombination
c. carrier leakage effects
d. exothermic actions
Q. Auger recombination can be reduced by using
a. strained mqw structure.
b. strained sqw structure.
c. gain-guided strained structure.
d. strained quantum dots lasers.
Q. The parameter that prevents carrier from recombination is
a. auger recombination
b. inter-valence band absorption
c. carrier leakage
d. low temperature sensitivity
Q. Determine the threshold current density for an AlGaAs injection laser with T0=180k at 30°C.
a. 6.24
b. 9.06
c. 3.08
d. 5.09