We experimentally demonstrate a scalable and reconfigurable optical tapped-delay-line (TDL) for multichannel equalization and correlation of 20-Gbaud quadrature-phase-shift-keyed (QPSK) signals using nonlinear wave mixing and a microresonator Kerr frequency comb. The optical TDL mainly consists of two stages: one being a multicasting of the original signals in a periodically poled lithium niobate (PPLN) waveguide with Kerr comb lines functioning as mutually coherent pumps, while the other is a coherent multiplexing of the delayed and weighted signal replicas in a second PPLN. A two- or three-tap optical TDL is demonstrated to simultaneously equalize a distorted QPSK data signal, reducing the error vector magnitude (EVM) from 22.5% to either 19.9% or 18.2%, and search two- or three-symbol patterns on another QPSK signal.

中文翻译：

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使用非线性混波和Kerr频率梳进行多通道均衡和相关的可扩展和可重新配置的光抽头延迟线

我们通过实验证明了使用非线性波混频和微谐振器Kerr频率梳进行20 Gbaud正交相移键控（QPSK）信号的多通道均衡和相关的可扩展和可重新配置的光抽头延迟线（TDL）。光学TDL主要包括两个阶段：一个是在周期性极化铌酸锂（PPLN）波导中多播原始信号，其中Kerr梳状线起着相互相干泵的作用，而另一个则是延迟和加权信号的相干复用。第二个PPLN中的副本。演示了两次或三次抽头的光学TDL，可同时均衡失真的QPSK数据信号，将误差矢量幅度（EVM）从22.5％降低到19.9％或18.2％，并在另一幅上搜索二次或三次符号模式QPSK信号。