# Analog Systems MCQ’s

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

1. Determine RMS pulse broadening with mode coupling if pulse broadening is 0.6 over 8km.

a) 1.6ns

b) 1.7ns

c) 1.5ns

d) 1.4ns

2. Determine dispersion equalization penalty with mode coupling of 1.7ns if B_{T} is 25 Mbits/s.

a) 4.8 * 10^{4}dB

b) 4 * 10^{4}dB

c) 4.2 * 10^{4}dB

d) 3.8 * 10^{4}dB

3. Determine dispersion equalization penalty if total RMS pulse broadening is 4.8ns, B_{T} is 25 Mbits/s.

a) 0.03 dB

b) 0.08 dB

c) 7 dB

d) 0.01 dB

4. Determine dispersion equalization penalty without mode coupling if B_{T} is 150 Mbits/s and total rms pulse broadening is 4.8ns.

a) 34 dB

b) 33 dB

c) 76.12 dB

d) 34.38 dB

5. Determine the peak output voltage if efficiency is 70%, wavelength is 0.85μm and output power is 1mW.

a) 7V

b) 8V

c) 5V

d) 6V

6. Determine the wavelength of a coaxial cable system operating at temperature 17 degree Celsius at output voltage of 5V, 100Ω impedance, optical power of 1mW, 70% quantum efficiency.

a) 0.39μm

b) 0.60μm

c) 0.85μm

d) 0.98μm

7. Determine ratio of SNR of coaxial system to SNR of fiber system if peak output voltage is 5V, quantum efficiency of 70%, optical power is 1mW, wavelength of 0.85μm.

a) 1.04 * 10^{4}

b) 2.04 * 10^{4}

c) 3.04 * 10^{4}

d) 4.04 * 10^{4}

8. Determine the efficiency of a coaxial cable system at 17 degree Celsius with peak output voltage 5V, 0.85 μm wavelength and SNR ratio of 1.04 * 10^{4}.

a) 80%

b) 70%

c) 40%

d) 60%

9. Determine the impedance of a coaxial cable system operating at temperature 17 degree Celsius at output voltage of 5V, 0.85μmwavelength, optical power of 1mW, 70% quantum efficiency and SNR ratio of 1.04 * 10^{4}.

a) 80Ω

b) 50Ω

c) 90Ω

d) 100Ω

10. The 10-90% rise times for components used in D-IM analog optical link is given. (LED=10ns, Intermodal=9ns/km, Chromatic=2ns/km, APD = 3ns). Link is of 5km. It has an optical bandwidth of 6MHz. Determine maximum permitted system rise time.

a) 58.3ns

b) 54ns

c) 75ns

d) 43.54ns

11. The 10-90% rise times for components used in D-IM analog optical link is given. (LED=10ns, Intermodal=9ns/km, Chromatic=2ns/km, APD = 3ns). Link is of 5km. Determine the total rise time.

a) 62ns

b) 53ns

c) 50ns

d) 52ns

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