Demodulation Schemes MCQ’s

Electronics & Communication Engineering Optical Communication

This set of Optical Communication Multiple Choice Questions & Answers (MCQs) focuses on “Demodulation Schemes”.

1. In ___________ detection, the phase of the local oscillator signal is locked to the incoming signal.
a) Homodyne
b) Heterodyne
c) Spatial
d) Noisy

2. The introduction of nonlinear element within the ______ is necessary to enable efficient carrier recovery.
a) PSK
b) ASK
c) FSK
d) PLL

3. _________ heterodyne detection does not require phase matching between the incoming signal and the local oscillator.
a) Synchronous
b) Asynchronous
c) Noisy
d) Spatial

4. What is the main attraction of the optical homodyne detection?
a) Receiver sensitivity
b) Transmission power
c) Modulation scheme
d) Line width

5. How many strategies of homodyne demodulation have proved to be successful for coherent optical fiber reception?
a) One
b) Three
c) Four
d) Two

6. The received signal through polarization diversity reception is linearly polarized.
a) False
b) True

7. The phase difference between the local oscillator and the source must be ________ for high sensitivity reception.
a) Deep
b) High
c) Direct
d) Near zero

8. In the __________ receiver, the incoming signal is not precisely shifted to the baseband.
a) Intra-dyne
b) Heterodyne
c) Homodyne
d) Optical

9. Phase diversity reception is also referred to as ______________
a) Homodyne detection
b) Noisy detection
c) Homodyne detection
d) Multiport detection

10. The use of PLL can be avoided in the intra-dyne detection.
a) False
b) True

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