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Design techniques for subcarrier multiplexed broadcast optical networks

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5 Author(s)
Walker, S.D. ; Dept. of Electron. Syst. Eng., Essex Univ., Colchester, UK ; Li, M. ; Boucouvalas, A.C. ; Cunningham, D.G.
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Design techniques which enable the performance of subcarrier multiplexed FM broadcast optical networks to be optimized at the planning stage are described. At the transmitter node, criteria for maximizing the subscriber carrier-to-noise ratio (CNR) are presented. At the subscriber node, it is shown that under the majority of circumstances, the optimum direct detection receiver consists of a low-noise III-V avalanche photodiode and high-impedance front-end preamplifier. Sensitivities approaching -40 dB (1 mW) for 16.5 dB CNR in 36 MHz subscriber bandwidth are predicted for a 60-channel system. Preliminary experimental tests on an optical-feedback subcarrier receiver showed -34 dB (1 mW) sensitivity at 1.55 μm from 16.5 dB CNR in a 36 MHz bandwidth centered on 1.2 GHz with a 12% modulation index single-channel FM test signal

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Selected Areas in Communications, IEEE Journal on  (Volume:8 ,  Issue: 7 )