Practical Constraints of Coherent Transmission MCQ’s

This set of Optical Communication Multiple Choice Questions & Answers (MCQs) focuses on “Practical Constraints of Coherent Transmission”.

1. __________ dictates the performance characteristics required from components and devices which are to be utilized in coherent optical fiber systems.
a) System considerations
b) Bluetooth technology
c) Multiplexing
d) Practical constraints

2. Coherent optical transmission is degraded by the ________ associated with the transmitter and local oscillator lasers.
a) Phase noise
b) White noise
c) Dissipation
d) Power

3. Which technology development has helped the field of optical fiber communication?
a) Glass technology
b) Component technology
c) Multiplexing
d) Power

4. ___________ improves the spectral purity of the device output and noise current.
a) Power dissipation
b) Laser line width reduction
c) Laser line width injection
d) Phase noise

5. Which technique was started for narrowing of injection laser line widths?
a) External resonator cavity
b) Long-hauled oscillator
c) Circulator
d) Gyrator

6. ___________ is an alternative to reduce phase noise and line width requirements.
a) Homodyne detection
b) Heterodyne detection
c) FSK modulation
d) Phase diversity reception

7. ____________ is the principal cause of line width broadening in the coherent devices.
a) Electromagnetic field
b) Power dissipation
c) Injection laser phase noise
d) Gaussian noise

8. The line width tolerance is wider for heterodyne receivers.
a) False
b) True

9. The use of balanced receiver compensates the losses due to coupling optics.
a) True
b) False

10. ______________ is the progressive spatial separation between the two polarization modes as they propagate along the fiber.
a) Fiber birefringence
b) Fiber dispersion
c) Fiber separation
d) Fiber coupling

11. Which technique was found to be providing an infinite range of polarization control?
a) Homodyne detection
b) Fiber squeezers
c) Heterodyne detection
d) Power dissipation

12. How many compensator devices are required to provide full polarization-state control?
a) Three
b) One
c) Four
d) Two

13. What is the main drawback of the squeezer?
a) Damages the fiber
b) Attenuation
c) Dispersion
d) Signal degradation

14. ___________ is the phenomenon which occurs in the single carrier systems due to small refractive index changes induced by the optical power fluctuations.
a) SBS gain
b) Self-phase modulation
c) FSK modulation
d) Birefringence

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