4. a) A communications link between two towns 38km apart is required to operate at a bit rate of 295Mbit/s. The chosen system uses single mode 1300nm fibre with a dispersion coefficient of 4ps/km.nm. What is the maximum allowed linewidth of the source assuming that the maximum allowed pulse spread is 0.25T. b) The attenuation coefficient of the fibre in the above link is 0.42dB/km and the receiver sensitivity is -35dBm. What is the minimum acceptable transmitter power in mW assuming a 12dB reduction in the power budget for joints, margin and penalties.

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4. a) A communications link between two towns 38km apart is required to operate at a
bit rate of 295Mbit/s. The chosen system uses single mode 1300nm fibre with a
dispersion coefficient of 4ps/km.nm. What is the maximum allowed linewidth of the
source assuming that the maximum allowed pulse spread is 0.25T.
b) The attenuation coefficient of the fibre in the above link is 0.42dB/km and the
receiver sensitivity is -35dBm. What is the minimum acceptable transmitter power in
mW assuming a 12dB reduction in the power budget for joints, margin and penalties.
Transcribed Image Text:4. a) A communications link between two towns 38km apart is required to operate at a bit rate of 295Mbit/s. The chosen system uses single mode 1300nm fibre with a dispersion coefficient of 4ps/km.nm. What is the maximum allowed linewidth of the source assuming that the maximum allowed pulse spread is 0.25T. b) The attenuation coefficient of the fibre in the above link is 0.42dB/km and the receiver sensitivity is -35dBm. What is the minimum acceptable transmitter power in mW assuming a 12dB reduction in the power budget for joints, margin and penalties.
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