Chitgarha Mohammad Reza, Khaleghi Salman, Ziyadi Morteza, Mohajerin-Ariaei Amirhossein, Almaiman Ahmed, Daab Wajih, Rogawski Devora, Tur Moshe, Touch Joseph D, Langrock Carsten, Fejer Martin M, Willner Alan E
Opt Lett. 2014 May 15;39(10):2928-31. doi: 10.1364/OL.39.002928.
We propose and demonstrate an all-optical phase noise reduction scheme that uses optical nonlinear mixing and tunable optical delays to suppress the low-speed phase noise induced by laser linewidth. By utilizing the phase conjugate copy of the original signal and two narrow-linewidth optical pumps, the phase noise induced by laser linewidth can be reduced by a factor of ∼5 for a laser with 500-MHz phase noise bandwidth. The error-vector-magnitude can be improved from ∼30% to ∼14% for the same laser linewidth for 40-Gbit/s quadrature phase shift keying signal.
我们提出并演示了一种全光相位噪声降低方案，该方案利用光学非线性混频和可调谐光学延迟来抑制由激光线宽引起的低速相位噪声。通过利用原始信号的相位共轭副本和两个窄线宽光泵浦，对于具有500-MHz相位噪声带宽的激光器，由激光线宽引起的相位噪声可降低约5倍。对于40-Gbit/s正交相移键控信号，在相同激光线宽的情况下，误差矢量幅度可从约30%提高到约14%。
