Quiz 3_2

Quiz 3_2 - sys ) 2. A hybrid radio/fibre system is to be...

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Quiz 3 Exam Style Questions 1. A 32 channel wavelength division multiplexing system operates over 100km. The fibre has a loss coefficient of 0.25dB/km. The receiver sensitivity is -33dBm and the loss of a 1x32 AWG is 12dB. Given that the launch power was -10dBm and that 4 EDFAs were used, what is the required gain of each amplifier if you want a power margin of 6dB? Assuming the system uses external modulators with a rise time of 100ps and that the spectral width of the modulated signal is 0.2nm and the dispersion of the fibre being used is 3ps/(km.nm). Calculate the maximum allowable receiver risetime if you wish the system to operate at 2.5Gb/s using a NRZ format. (For NRZ transmission, the maximum bit rate that can be transmitted is 0.7/T
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Unformatted text preview: sys ) 2. A hybrid radio/fibre system is to be used to transmit an RF data signal (at 12GHz) from the central station to base stations. Given that the antenna at the base station needs to be driven at -16dBm to operate correctly. Calculate the minimum launch optical power at the central station given that: The modulation index of the optical signal is 1 (100%) The link is 20km long and uses fibre with a loss of 0.5dB/km The detector has a responsivity of 0.4A/W The base station has an RF amplifier with a gain of 20dB and an input impedance of 50Ohms The electrical power in a sinewave with a peak-to-peak voltage Vp is (Vp) 2 /8R....
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