Abstract
Coherent AM analog optical links are analyzed taking into account laser phase noise. With the optimum selection of the IF bandwidth, coherent AM links can be made essentially independent of the laser linewidth. Under shot-noise-limited conditions, the fundamental limit of the dynamic range (FLDR) for coherent links is 148 dB-Hz per 1 mW of the received optical power versus 151 dB-Hz/mW for conventional direct detection links. However, when the received optical power is less than 1 mW, coherent links can improve the dynamic range by some 7 dB as compared to direct detection links. >
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