Modulation Formats MCQ’s

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

1. Almost _________ of the transmitter power is wasted in the use of external modulators.
a) Half
b) Quarter
c) One-third
d) Twice

2. The line width in the range ________ of bit rate is specified for ASK heterodyne detection.
a) 8%
b) 2 to 8%
c) 10 t0 50%
d) 70%

3. _____________ is essentially a crude form of Amplitude shift keying.
a) Analog modulation
b) Digital intensity modulation
c) Photodetector
d) Receiver structure

4. ______________ is also referred to as on-off keying (OOK).
a) FSK
b) DSK
c) PSK
d) ASK

5. The frequency deviation at frequencies above 1 MHz is typically ____________
a) 10 to 20 mA-1
b) 100 to 500 mA-1
c) 1000 to 2000 mA-1
d) 30 to 40 mA-1

6. Eight level FSK and binary PSK yields an equivalent sensitivity.
a) False
b) True

7. ________ does not require an external modulator.
a) FSK
b) DSK
c) PSK
d) ASK

8. _________ can potentially provide spectral conservation through the use of multilevel signalling.
a) M-ary PSK
c) ASK

9. ___________ offers the potential for improving the coherent optical receiver sensitivity by increasing the choice of signalling frequencies.

10. External modulation for ________ modulation format allows the most sensitive coherent detection mechanism.
a) FSK
b) DSK
c) PSK
d) ASK

11. The digital transmission on implementation of polarization modulation which involves polarization characteristics of the transmitted optical signal is known as _____________
a) Frequency shift keying
b) Amplitude shift keying
c) Phase shift keying
d) Polarization shift keying

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