Receiver Sensitivities

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

1. ASK with heterodyne detection can achieve same SNR limit as ASK with asynchronous detection.
a) True
b) False

2. In a ______________ receiver, the analyses of signal and noise phenomena are more complicated than in the IM-DD case.
a) Homodyne
b) Heterodyne
c) Circular
d) Heterogeneous

3. FSK modulation is attributed to the use of __________ frequencies unlike ASK modulation.
a) One
b) Three
c) Two
d) Four

4. BER of FSK modulation scheme is ________ as/to the ASK modulation scheme.
a) Twice
b) Thrice
c) Unequal
d) Same

5. ___________ can also be used in place of multilayered filters in the dual filter direct detection FSK receiver.
a) Bragg gratings
b) Ceramic gratings
c) Aluminum arsenide
d) Bragg diodes

6. FSK synchronous detection is _________ more sensitive than asynchronous heterodyne detection.
a) 0.24 dB
b) 0.45 dB
c) 0.9 dB
d) 0.12 dB

7. The asynchronous heterodyne detection is _________ more sensitive than the dual filter direct detection FSK receiver.
a) 0.9 dB
b) 0.23 dB
c) 0.43 dB
d) 0.40 dB

8. The use of __________ was undertaken to separate the polarization in an analog to digital conversion.
a) FSK
b) DSP
c) ASK

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