Demodulation Schemes

Optical Communications

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

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

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

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

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

5. 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

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

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

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

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

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

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