A fine tunable parity-time symmetric optoelectronic oscillator (PT-OEO) based on laser wavelength tuning is proposed and experimentally demonstrated. In the PT-OEO, an intensity modulator (IM) and a dispersion compensating fiber (DCF) are merged into the loop. Tuning the laser wavelength leads to a reconfigurable dispersion-induced power fading, serving as rough tunable oscillation mode selection. Meanwhile, to implement a fine-mode selection, parity-time symmetry breaking is introduced. Consequently, a fine tunable PT-OEO is achieved without using a high quality-factor (Q-factor) electrical filter. Experiment shows that the frequency of the generated signal can be tuned from 20.34 to 19.49 GHz with a step of 203 MHz, when the laser wavelength is manipulated from 1545 to 1565 nm. The phase noise is evaluated as −116.1 dBc/Hz @ 10-kHz offset frequency.

中文翻译：

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基于激光波长调谐的微调PT对称光电振荡器

提出并实验证明了一种基于激光波长调谐的可微调奇偶时间对称光电振荡器（PT-OEO）。在 PT-OEO 中，强度调制器 (IM) 和色散补偿光纤 (DCF) 合并到环路中。调谐激光波长会导致可重构色散引起的功率衰减，用作粗调的可调谐振荡模式选择。同时，为了实现精细模式选择，引入了奇偶时间对称性破坏。因此，无需使用高品质因数（Q 因数）电子滤波器即可实现可微调的 PT-OEO。实验表明，当激光波长从 1545 到 1565 nm 被操纵时，产生的信号的频率可以从 20.34 到 19.49 GHz 以 203 MHz 的步长进行调谐。相位噪声被评估为-116。