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In this paper, we propose a multipoint stable radio frequency (RF) optical transmission system with tree structure. Based on the principle of phase conjugation, the phase jitter induced by environment variation can be compensated by frequency mixing. Different from other schemes, the RF signal is modulated on a optical comb at local and each tooth is grouped with a near subcarrier for a user. By using wavelength division multiplexer, these groups are separated and transmitted to the multiple points over fiber. Therefore, the degradation

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