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Coherent optical two-tone generation using an optical frequency comb generator based on an amplified optical fiber loop is successfully demonstrated. The observed phase noises in the 100-GHz band are less than −80 dBc/Hz at 1 MHz. This method is suitable for high-speed radio communication based on advanced modulation techniques.

Phase noise analysis of an optical frequency comb using single side-band suppressed carrier modulation in an amplified optical fiber loop