Minoofar Amir, Alhaddad Abdulrahman, Ko Wing, Karapetyan Narek, Almaiman Ahmed, Zhou Huibin, Ramakrishnan Muralekrishnan, Annavaram Murali, Tur Moshe, Habif Jonathan L, Willner Alan E
Opt Lett. 2024 Sep 1;49(17):4899-4902. doi: 10.1364/OL.530189.
Compared to its electronic counterpart, optically performed matrix convolution can accommodate phase-encoded data at high rates while avoiding optical-to-electronic-to-optical (OEO) conversions. We experimentally demonstrate a reconfigurable matrix convolution of quadrature phase-shift keying (QPSK)-encoded input data. The two-dimensional (2-D) input data is serialized, and its time-shifted replicas are generated. This 2-D data is convolved with a 1-D kernel with coefficients, which are applied by adjusting the relative phase and amplitude of the kernel pumps. Time-shifted data replicas (TSDRs) and kernel pumps are coherently mixed using nonlinear wave mixing in a periodically poled lithium niobate (PPLN) waveguide. To show the tunability and reconfigurability of this approach, we vary the kernel coefficients, kernel sizes (e.g., 2 × 1 or 3 × 1), and input data rates (e.g., 6-20 Gbit/s). The convolution results are verified to be error-free under an applied: (a) 2 × 1 kernel, resulting in a 16-quadrature amplitude modulation (QAM) output with an error vector magnitude (EVM) of ∼5.1-8.5%; and (b) 3 × 1 kernel, resulting in a 64-QAM output with an EVM of ∼4.9-5.5%.
与电子方式相比，光学执行的矩阵卷积能够以高速率处理相位编码数据，同时避免光-电-光（OEO）转换。我们通过实验展示了对正交相移键控（QPSK）编码输入数据的可重构矩阵卷积。二维（2-D）输入数据被序列化，并生成其时间移位副本。该二维数据与具有系数的一维内核进行卷积，这些系数通过调整内核泵浦的相对相位和幅度来施加。使用周期性极化铌酸锂（PPLN）波导中的非线性波混频，将时间移位数据副本（TSDR）和内核泵浦进行相干混合。为了展示这种方法的可调谐性和可重构性，我们改变内核系数、内核大小（例如2×1或3×1）以及输入数据速率（例如6 - 20 Gbit/s）。在应用以下条件时，卷积结果经验证无误：（a）2×1内核，产生16正交幅度调制（QAM）输出，误差矢量幅度（EVM）约为5.1 - 8.5%；（b）3×1内核，产生64 - QAM输出，EVM约为4.9 - 5.5%。
