(b) An optical fibre communications system consists of a transmitter generating a 5 Gb-s non-return-to-zero (NRZ)...

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(b) An optical fibre communications system consists of a transmitter generating a 5 Gb-s¹¹ non-return-to-zero (NRZ) binary data signal; 60 km of single-mode fibre with loss of 0.25 dB-km³¹; and a receiver with a photodiode with responsivity 0.7 A-W¹. The average modulated optical power from the transmitter is -5 dBm, and the extinction ratio of the NRZ signal is 7 dB. If the receiver thermal noise spectral density is 4 x 10-22 A² Hz¹ and the receiver bandwidth is 70% of the bit rate, calculate the Q parameter. You may assume that the performance of the system is limited by thermal noise. [6 marks] (b) An optical fibre communications system consists of a transmitter generating a 5 Gb-s¹¹ non-return-to-zero (NRZ) binary data signal; 60 km of single-mode fibre with loss of 0.25 dB-km³¹; and a receiver with a photodiode with responsivity 0.7 A-W¹. The average modulated optical power from the transmitter is -5 dBm, and the extinction ratio of the NRZ signal is 7 dB. If the receiver thermal noise spectral density is 4 x 10-22 A² Hz¹ and the receiver bandwidth is 70% of the bit rate, calculate the Q parameter. You may assume that the performance of the system is limited by thermal noise. [6 marks]

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Q parameter Q 10 0 7 0 ... View the full answer