Optical Fiber Communication Quiz | Optical Fiber Communication Multiple Choice Questions with Answers

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Questions
61 Which optical devices are adopted or applicable for routing signals from one waveguide to another?
A Optical Combiner
B Optical Splitter
C Optical Coupler
D None of the above

Answer: Optical Coupler
62 Which type of fiber-optic coupler causes the distribution of an optical power from more than two input ports among the several output ports?
A Star Coupler
B Tree Coupler
C X Coupler
D All of the above

Answer: Star Coupler
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63 What is/ are the consequence/s of Self Phase Modulation in non-linear optics?
A Modification in pulse spectrum
B Limited transmission rate
C both compressibility and permeability
D All of the above

Answer: All of the above
64 Which reason/s is/are responsible for the occurrence of non-linear Cross Phase Modulation (XPM)?
A Difference in transmission phase of peak pulse & leading or trailing edges of pulse
B Third-order optical non-linearity
C Intensity dependence of refractive index
D All of the above

Answer: Intensity dependence of refractive index
65 In cables, water is prevented from filling the spaces with __________resistant compounds.
A moisture
B pressure
C temperature
D stress

Answer: moisture
66 Why are plastic clad silica fiber optic cables not used widely?
A Difficulty in connector application due to excessive plasticity in cladding
B Difficulty in bonding
C Insolubility in organic solvents
D All of the above

Answer: All of the above
67 Which among the following represents the lateral shift of a light beam on reflection at a dielectric interface?
A Doppler’s Shift
B Goos-Haenchen’s Shift
C Frequency Shift
D Phase Shift

Answer: Goos-Haenchen’s Shift
68 The order of mode is equal to the number of field____ across the guide.
A Zeros
B Poles
C Ones
D All of the above

Answer: Zeros
69 In the structure of fiber optic cable, the refractive index of core is always _______the refractive index of cladding.
A Less than
B Equal to
C Greater than
D None of the above

Answer: Greater than
70 If a noisy channel has a bandwidth of 4 MHz with signal to noise ratio of about 1, what would be the maximum capacity of the channel?
A 2 Mb/sec
B 4 Mb/sec
C 6 Mb/sec
D 8 Mb/sec

Answer: 4 Mb/sec
71 For neglecting the pulse dispersion in the digital systems, the rms width of fiber impulse response must be _________one-quarter of the pulse spacing.
A Less than
B Equal to
C Greater than
D None of the above

Answer: Less than
72 Consider the assertions/ characteristics given below. Which type of attenuation measurement technique exhibits these characteristics?

1. Necessity of accessing both ends of fiber.

2. Measurements corresponding to specific wavelengths.

3. Requirement of spectral response over a range of wavelengths.

A Cutback Technique
B Insertion Loss Technique
C Use of OTDR Technique
D None of the above

Answer: Cutback Technique
73 Which among the following is/are responsible for generating attenuation of an optical power in fiber?
A Absorption
B Scattering
C Waveguide effect
D All of the above

Answer: All of the above
74 In circulator, an optical path of signal follows _______
A An open loop
B A closed loop
C Both a and b
D None of the above

Answer: A closed loop
75 Which among the following controls the length of Fabry-Perot interferometer so that it can act as a tunable optical filter?
A Transducer
B Tachometer
C Multimeter
D Phase-meter

Answer: Transducer
76 Which category/ies of wavelength division multiplexer comprise/s two 3dB couplers where the splitting of an incident beam takes place into two fiber paths, followed by the recombination with second 3-dB coupler?
A Interference filter based devices
B Angular dispersion based devices
C Mach-Zehnder Interferometers
D All of the above

Answer: Mach-Zehnder Interferometers
77 In high impedance preamplifier, how are the noise sources kept to minimum level?
A By reducing dark current with proper selection of photodiode
B By reducing thermal noise of biasing resistor
C By using high impedance amplifier
D All of the above

Answer: All of the above
78 Which type of preamplifier plays a crucial role in reducing the effect of thermal noise?
A Low Impedance Pre-amplifier
B High Impedance Preamplifier
C Transimpedance Preamplifier
D None of the above

Answer: High Impedance Preamplifier
79 In pyroelectric photodetectors, the consequent increase in dielectric constant due to temperature variation by the photon absorption, is generally measured as change in _______
A resistance
B inductance
C admittance
D capacitance

Answer: capacitance
80 Which among the following misalignments give/gives rise to the occurrence of splice loss?
A Longitudinal separation between the end-faces of fiber
B Angular tilt between fiber ends
C Transverse offset between fiber ends
D All of the above

Answer: All of the above

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