A tunable and reconfigurable optical aggregation system is experimentally demonstrated. Optical Nyquist pulses are generated on multiple channels using a microresonator-based Kerr optical frequency comb and insertion of uniform lines by an intensity modulator. Data are modulated on optically generated Nyquist pulses and aggregated through nonlinear wave mixing in a periodically poled lithium niobate (PPLN) waveguide. Two quadrature-phase-shift-keying (QPSK) channels are aggregated to a single 16-quadrature amplitude modulation (16-QAM) channel of Nyquist pulses. To demonstrate the system tunability, we perform aggregation over different baud rates and different modulation formats. The reconfigurability of the system is demonstrated by aggregating two binary-phase-shift-keying (BPSK) channels into a QPSK or a 2-level amplitude-shift keying and a 2-level phase-shift keying (2-ASK/2-PSK) channel by tuning the relative phase and amplitude of the inputs. Furthermore, three BPSK channels are aggregated into one 4-ASK/2-PSK channel. The quality of the aggregated channel is investigated using two different approaches for wave mixing in the PPLN waveguide.

中文翻译：

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使用非线性波混合和克尔频率梳在光学生成的奈奎斯特脉冲序列上演示 QPSK 到 16-QAM 的可调谐光学聚合

实验证明了可调谐和可重新配置的光聚合系统。使用基于微谐振器的克尔光频率梳和强度调制器插入均匀线在多个通道上生成光奈奎斯特脉冲。数据在光学生成的奈奎斯特脉冲上调制，并通过周期性极化铌酸锂 (PPLN) 波导中的非线性波混合进行聚合。两个正交相移键控 (QPSK) 通道聚合为单个 16 正交幅度调制 (16-QAM) 奈奎斯特脉冲通道。为了演示系统的可调谐性，我们对不同的波特率和不同的调制格式进行聚合。通过将两个二进制相移键控 (BPSK) 通道聚合为 QPSK 或 2 级幅移键控和 2 级相移键控 (2-ASK/2-PSK) 来证明系统的可重构性) 通道通过调整输入的相对相位和幅度。此外，三个 BPSK 通道聚合为一个 4-ASK/2-PSK 通道。使用两种不同的 PPLN 波导中的混波方法研究聚合通道的质量。