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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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- Spring '11