By reducing the noise component induced by the amplitude-to-phase conversion, a broadband phase-noise suppression of a 20.5GHz photonic microwave, generated from an optical heterodyne of a dual-wavelength single-frequency fiber laser (DW-SFFL) is experimentally demonstrated. This is done by suppressing the intensity noise of the DW-SFFL through optoelectronic feedback, the microwave shows phase-noise suppression around the frequency range 100Hz to 100kHz. The phase-noise suppression of 6.1dB at 1kHz offset frequency and a linewidth of 2.15kHz are obtained from this microwave system. The successful improvement indicates the feasibility of our strategy in obtaining a low phase-noise microwave.

通过减少幅度相位转换引起的噪声分量，实验性地抑制了双波长单频光纤激光器 (DW-SFFL) 的光外差产生的 20.5GHz 光子微波的宽带相位噪声证明了。这是通过光电反馈抑制 DW-SFFL 的强度噪声来实现的，微波在 100Hz 至 100kHz 的频率范围内显示出相位噪声抑制。该微波系统在 1kHz 偏移频率和 2.15kHz 的线宽下获得了 6.1dB 的相位噪声抑制。成功的改进表明我们的策略在获得低相位噪声微波方面是可行的。