Optical Fiber Communication Short Questions and Answers

41 Which type of scattering occurs due to interaction of light in a medium with time dependent optical density variations thereby resulting into the change of energy (frequency) & path?

A Stimulated Brilliouin Scattering (SBS)

B Stimulated Raman Scattering (SRS)

C Mie Scattering

D Rayleigh Scattering

View Answer

Answer: Stimulated Brilliouin Scattering (SBS)

42 In Rayleigh scattering of light in glass, at which type of temperature does the glass attain the state of thermal equilibrium and exhibits its relativity to annealing temperature?

A Junction

B Fictive

C Breakdown

D Decomposition

View Answer

Answer: Fictive

43 Assuming no ISI, the maximum possible bandwidth of a multimode graded index fiber with 5 MHz, shows the total pulse broadening of 0.1s for the distance of about 12km. What would be the value of bandwidth length product?

A 40 MHz

B 60 MHz

C 90 MHz

D 120 MHz

View Answer

Answer: 60 MHz

44 At which level of temperature does the oxidation process occur in MCVD?

A Low

B Moderate

C High

D Unpredictable

View Answer

Answer: High

45 Consider the assertions given below. Which is the correct sequential order of process adopted in glass fiber preparation?

A. Drawing of fiber

B. Production of pure glass

C. Pulling of fiber

D. Conversion of pure glass into preform

A B, D, A, C

B A, B, C, D

C C, A, D, B

D D, B, A, C

View Answer

Answer: B, D, A, C

46 Consider the statements given below. Which among them is not a drawback of double crucible method?

A Utility in mass production of fibers

B High attenuation

C High OH content in drawn fiber

D Addition of impurity while the fiber is drawn

View Answer

Answer: Utility in mass production of fibers

47 On which of the following factor/s do/does the ‘Hydrogen Effect’ depend/s?

A Type of fiber & Cable Design

B Operating Wavelength

C Installation Method

D All of the above

View Answer

Answer: All of the above

48 With respect to single mode and graded index fibers, which parameter specifies the propagation of polarization modes with different phase velocities & the difference between their effective refractive indices?

A Mode field diameter

B Birefringence

C Fiber beat length

D Spot Size

View Answer

Answer: Birefringence

49 Which kind of dispersion phenomenon gives rise to pulse spreading in single mode fibers?

A Intramodal

B Intermodal

C Material

D Group Velocity

View Answer

Answer: Intramodal

50 If a fiber operates at 1400nm with the diameter of about 10 μm, n1 = 1.30, Δ = 0.80% , V = 3.5, then how many modes will it have?

A 6.125

B 9.655

C 12.95

D 16.55

View Answer

Answer: 6.125

51 In Lambertian output pattern of LED, the source is ______ bright from all directions.

A Less

B Equally

C More

D Unpredictably

View Answer

Answer: Equally

52 The small section of fiber which is coupled to the optical source is known as _________

A Flylead

B Pigtail

C Both a and b

D None of the above

View Answer

Answer: Both a and b

53 In a laser structure, the existence of standing waves is possible at frequencies for which the distance between the mirrors is an integral number of ________

A λ / 2

B λ / 4

C λ / 6

D λ / 8

View Answer

Answer: λ / 2

54 Consider a crystal of ruby laser whose length is 6 cm and the refractive index is 1.8, emits the wavelength of about 0.55 μm. What will be the value of number of longitudinal modes?

A 3.9 x 105

B 4.9 x 105

C 5.6 x 105

D 7.7 x 105

View Answer

Answer: 3.9 x 105

55 In Stimulated Emission, which among the following parameters of generated photon is/are similar to the photon of incident wave?

A Phase

B Frequency

C Polarization & direction of travel

D All of the above

View Answer

Answer: All of the above

56 How many mating cycles are being rated by typically matched SC Connectors?

A 500

B 600

C 800

D 1000

View Answer

Answer: 1000

57 Which among the following is regarded as a keyed bayonet connector along with its feasibility of easiest insertion and removal from the fiber optic cable?

A FC Connectors

B LC Connectors

C MT-RJ Connectors

D ST Connectors

View Answer