Top 150+ Solved Broadband Communication Systems MCQ Questions Answer
Q. A particular GaAs fiber has a Fresnel reflection magnitude of 17.6% i.e. 0.176. Find the power loss between the source and the fiber?
a. 0.86 db
b. 0.78 db
c. 0.84 db
d. 0.83 db
Q. Two joined step index fibers are perfectly aligned. What is the coupling loss of numerical aperture are NAR= 0.26 for emitting fiber?
a. -0.828 db
b. -0.010 db
c. -0.32 db
d. 0.32 db
Q. How many types of misalignments occur when joining compatible fiber?
a. one
b. two
c. five
d. three
Q. Losses caused by factors such as core-cladding diameter, numerical aperture, relative refractive index differences, different refractive index profiles, fiber faults are known as
a. intrinsic joint losses
b. extrinsic losses
c. insertion losses
d. coupling losses
Q. A step index fiber has a coupling efficiency of 0.906 with uniform illumination of all propagation modes. Find the insertion loss due to lateral misalignment?
a. 0.95 db
b. 0.40 db
c. 0.42 db
d. 0.62 db
Q. Determine coupling efficiency if the misalignment loss in a graded index fiber is 0.102
a. 0.136
b. 0.898
c. 0.982
d. 0.684
Q. In a single mode fiber, the losses due to lateral offset and angular misalignment are given by 0.20 dB and 0.46 dB respectively. Find the total insertion loss
a. 0.66 db
b. 0.26 db
c. 0.38 db
d. 0.40 db
Q. Better confinement of optical mode is obtained in
a. multi quantum well lasers.
b. single quantum well lasers.
c. gain guided lasers.
d. bh lasers.
Q. Multi-quantum devices have superior characteristics over
a. bh lasers.
b. dh lasers.
c. gain guided lasers.
d. single-quantum-well devices.
Q. Dot-in-well device is also known as
a. dh lasers.
b. bh lasers.
c. qd lasers.
d. gain guided lasers.
Q. QD lasers have a very low threshold current densities of range
a. 0.5 to 5 a cm-2
b. 2 to 10 a cm-2
c. 10 to 30 a cm-2
d. 6 to 20 a cm-2
Q. __________________ may be improved through the use of frequency-selective feedback so that the cavity loss is different for various longitudinal modes.
a. frequency selectivity
b. longitudinal mode selectivity
c. electrical feedback
d. dissipated power
Q. Device which apply the frequency-selective feedback technique to provide single longitudinal operation are referred to as ________________
a. dsm lasers
b. nd: yag lasers
c. glass fiber lasers
d. qd lasers