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Optical Communications Multiple Choice Questions | MCQs | Quiz

Optical Communications Interview Questions and Answers
Practice Optical Communications questions and answers for interviews, campus placements, online tests, aptitude tests, quizzes and competitive exams.

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•   Ray Theory Transmission
•   Electromagnetic Theory
•   Cylindrical Fiber
•   Single Mode Fibers
•   Photonic Crystal Fibers
•   Material Absorption
•   Linear & NonLinear Losses
•   Chromatic Dispersion
•   Intermodal Dispersion
•   Fiber Dispersion
•   Polarization
•   Non Linear Effects
•   Liquid Phase Techniques
•   Vapor Phase Techniques
•   Optical Fibers
•   Optical Fiber Cables
•   Fiber Characteristics
•   Cable Design
•   Fiber Alignment & Joint
•   Fiber Splices
•   Fiber Connectors
•   Expanded Beam Connector
•   Fiber Couplers
•   Optical Isolators
•   Optical Sources Basics
•   Optical Emission
•   Semiconductor Injection
•   Injection Laser Structures
•   Frequency Injection Lasers
•   Injection Characteristics
•   Non Semiconductor Lasers
•   Tunable Lasers
•   Infrared Lasers
•   LED Power & Efficiency
•   LED Structures
•   LED Characteristics
•   Device Types
•   Optical Detection Principles
•   Absorption
•   Quantum Efficiency
•   Semiconductor Photodiodes
•   Internal Gain Photodiodes
•   Infrared Photodiodes
•   Phototransistors
•   Noise
•   Receiver Noise
•   Receiver Structures
•   FET Pre Amplifiers
•   High Performance Receivers
•   Optical Amplifiers
•   Fiber & Waveguide Amplifier
•   Wavelength Conversion
•   Photonics Technologies
•   Planar Waveguides
•   Photonic Integrated Circuits
•   Optical Bistability
•   Optical Transmitter Circuit
•   Optical Receiver Circuit
•   Digital System Designs
•   Digital System Planning
•   Analog Systems
•   Multiplexing Strategies
•   Optical Amplifier Application
•   Dispersion Management
•   Coherent Transmission
•   Modulation Formats
•   Demodulation Schemes
•   Receiver Sensitivities
•   Multi Carrier Systems
•   ↓ Fiber Measurements ↓
•   Attenuation Measurements
•   Dispersion Measurements
•   Refractive Measurements
•   Wavelength Measurements
•   Diameter Measurements
•   Field Measurements
•   Optical Network Concepts
•   Optical Layers & Protocols
•   Routing Networks
•   Optical Switching Networks
•   Network Deployment
•   Optical Ethernet

Best Reference Books

Optical Communications Theory Books

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Optical Communications Questions and Answers – Photonic Crystal Fibers & Attenuation

Posted on July 19, 2017 by staff10

This set of Optical Communications Multiple Choice Questions & Answers (MCQs) focuses on “Photonic Crystal Fibers & Attenuation”.

1. Photonic crystal fibers also called as
a) Conventional fibers
b) Dotted fibers
c) Stripped fibers
d) Holey fibers
View Answer

Answer: d
Explanation: Photonic crystal fibers contain a fine array of air holes running longitudinally down the fiber cladding. The microstructure within the fiber is highly periodic.
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2. Conventional optical fibers has more transmission losses than photonic crystal fibers. State whether the statement is true or false.
a) True
b) False
View Answer

Answer: a
Explanation: Conventional optical fibers have several hundreds of losses in transmission. Photonic crystal fibers have resulted in reduction in overall transmission losses.

3. Losses in photonic crystal fibers are reduced to a level of
a) 0.1dB/km
b) 0.2dB/km
c) 0.3dB/km
d) 0.4dB/km
View Answer

Answer: c
Explanation: Conventional fibers have losses of several hundred decibels per km. The invention of photonic crystal tubes has reduced the losses by hundreds of decibels.

4. The high index contrast enables the PCF core to be reduced from around 8 μmin conventional fiber to
a) Less than 1μm
b) More than 5μm
c) More than 3μm
d) More than 2μm
View Answer

Answer: a
Explanation: PCF’s have a wider range of optical properties in comparison with standard fibers. The lesser the core, more is the intensity of light in the core and enhances the non-linear effects.

5. The periodic arrangement of cladding air holes in photonic band gap fibers provides for the formation of a photonic band gap in the
a) H-plane of fiber
b) E-plane of fiber
c) E-H-plane of fiber
d) Transverse plane of fiber
View Answer

Answer: d
Explanation: Photonic band gap fibers are a class of micro structured fiber in which periodic arrangement of air holes is required. As a PBG fiber exhibits a 2-dimensional band gap, than the wavelengths within this band gap cannot propagate perpendicular to the fiber axis.
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6. In index-guided photonic crystal fiber structure, the dark areas are air holes. What does white areas suggests?
a) Air
b) Silica
c) Water
d) Plasma
View Answer

Answer: d
Explanation: Index-guided photonic crystal fibers have greater index contrast because the cladding contains air-holes having refractive index 1. Both index guided and conventional fibers arises from the manner in which guided mode interacts with the cladding region.

7. The unit of measurement of attenuation in optical fibers is
a) km
b) dB
c) dB/km
d) Coulomb’s
View Answer

Answer: c
Explanation: Attenuation is also referred to as transmission loss. Channel attenuation helped to determine the maximum transmission distance prior to signal restoration. Attenuation is usually expressed in logarithmic unit of decibel. It is given by
αdBL = 10 log10Pi / Po
Where αdB= signal attenuation per unit length
Pi & Po = Input and output power

8. The optical fiber incurs a loss in signal power as light travels down the fiber which is called as
a) Scattering
b) Attenuation
c) Absorption
d) Refraction
View Answer

Answer: b
Explanation: When the light is passed through the fiber, it travels a large amount of distance before it starts fading. It needs restoration in the path. This loss or fading is called as Attenuation.

9. If the input power 100μW is launched into 6 km of fiber, the mean optical power at the fiber output is 2μW. What is the overall signal attenuation through the fiber assuming there are no connectors or splices?
a) 15.23dB
b) 16.98dB
c) 17.12dB
d) 16.62dB
View Answer

Answer: b
Explanation: Signal attenuation is usually expressed in decibels. It is given by
Signal attenuation=10 log10Pi / Po
Where, Pi & Po = Input and output power.

10. A device which reduces the intensity of light in optical fiber communications is
a) compressor
b) Optical attenuator
c) Barometer
d) Reducer
View Answer

Answer: b
Explanation: A compressor compresses the signal before transmission. It does not affect the intensity of light. Optical attenuator is a device that affects the intensity of light and incurs a loss in transmission.
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11. A decibel may be defined as the ratio of input and output optical power for a particular optical wavelength. State whether the following statement is true or false.
a) True
b) False
View Answer

Answer: a
Explanation: Signal attenuation refers to the loss in transmission and it needs a logarithmic unit to express. Decibel is mainly used for comparing two power levels. It has the advantage that the operations of multiplication and division reduce to addition and subtraction.

12. When the input and output power in an optical fiber is 120μW & 3μW respectively and the length of the fiber is 8 km. What is the signal attenuation per km for the fiber?
a) 3dB/km
b) 2dB/km
c) 1dB/km
d) 4dB/km
View Answer

Answer: b
Explanation: Signal attenuation per unit length is given by
αdBL = 10 log10Pi / Po
αdBL = 16 dB
αdB= 16 dB/L= 2dB/km.

Sanfoundry Global Education & Learning Series – Optical Communications.
To practice all areas of Optical Communications, here is complete set of 1000+ Multiple Choice Questions and Answers.

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« Optical Communications Questions and Answers – Single – Mode Fibers
Optical Communications Questions and Answers – Material Absorption & Fiber Bend Losses In Silicon Glass Fibers »
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