Top 150+ Solved Broadband Communication Systems MCQ Questions Answer

Q. A particular characteristic or parameter that occurs during analog transmission of injection lasers is

a. noise

b. mode hopping

c. carrier leakage effects

d. frequency chirping

Q. Intensity of output from semiconductor injection lasers leading to optical intensity noise is due to

a. fluctuations in amplitude

b. mode hopping

c. carrier leakage effects

d. frequency chirping

Q. In multimode lasers the optical feedback from unnecessary external reflections affecting stability of frequency and intensity is

a. remains unaffected

b. increased gradually

c. reduced

d. gets totally vanished

Q. The lasing line-width of Fox-smith resonator is ____________________

a. less than 1 mhz

b. 1 mhz

c. 2 mhz

d. greater than 3 mhz

Q. What is the widest tuning range obtained in optical fiber laser structure?

a. 60 nm

b. 80 nm

c. more than 100 nm

d. 100 nm

Q. The mechanism which results from a refractive index change in the passive waveguide layer is called as

a. absorption

b. spontaneous emission

c. monolithic inversion

d. bragg wavelength control

Q. How many sections are included in a sampling grating distributed Bragg-reflector laser (SG-DBR)?

a. four

b. five

c. three

d. two

Q. Determine the internal quantum efficiency generated within a device when it has a radiative recombination lifetime of 80 ns and total carrier recombination lifetime of 40 ns.

a. 20 %

b. 80 %

c. 30 %

d. 40 %

Q. The Lambertian intensity distribution __________ the external power efficiency by some percent.

a. reduces

b. does not affects

c. increases

d. have a negligible effect

Q. A planar LED fabricated from GaAs has a refractive index of 2.5. Compute the optical power emitted when transmission factor is 0.68.

a. 3.4 %

b. 1.23 %

c. 2.72 %

d. 3.62 %

Q. A planar LED is fabricated from GaAs is having a optical power emitted is 0.018% of optical power generated internally which is 0.018% of optical power generated internally which is 0.6 P. Determine external power efficiency.

a. 0.18%

b. 0.32%

c. 0.65%

d. 0.9%

Q. For a GaAs LED, the coupling efficiency is 0.05. Compute the optical loss in decibels.

a. 12.3 db

b. 14 db

c. 13.01 db

d. 14.6 db

Q. 13. In a GaAs LED, compute the loss relative to internally generated optical power in the fiber when there is small air gap between LED and fiber core. (Fiber coupled = 5.5 * 10-4Pint)

a. 34 db

b. 32.59 db

c. 42 db

d. 33.1 db

Q. Determine coupling efficiency into the fiber when GaAs LED is in close proximity to fiber core having numerical aperture of 0.3

a. 0.9

b. 0.3

c. 0.6

d. 0.12

Q. Refraction is the

a. bending of light waves

b. reflection of light waves

c. diffusion of light waves

d. refraction of light waves

Top 150+ Solved Broadband Communication Systems MCQ Questions Answer

From 31 to 45 of 133