All-Optical Multilevel Amplitude Regeneration Based on Polarization-Orthogonal Continuous-Wave-Light-Assisted Nonlinear-Optical Loop Mirror (PC-NOLM) Subsystem
All-Optical Multilevel Amplitude Regeneration Based on Polarization-Orthogonal Continuous-Wave-Light-Assisted Nonlinear-Optical Loop Mirror (PC-NOLM) Subsystem
复制标题
基于偏振正交连续波光辅助非线性光学环镜（PC-NOLM）子系统的全光多级振幅再生
DOI：
10.1109/access.2019.2947303
复制
发表时间：
2019-01-01
期刊：
影响因子：
3.9
通讯作者：
Qiu, Kun
中科院分区：
文献类型：
--
作者：
Guo, Biao;Wen, Feng;Qiu, Kun
我们在提出的偏振正交连续波光辅助非线性光环镜（PC-NOLM）子系统中展示了不归零的4电平脉冲振幅调制（NRZ-PAM4）信号的多电平振幅再生实验。在多个振幅水平上观察到均匀的再生行为，包括相同的噪声抑制效率和噪声处理能力。对输入信号进行预相位调制，使其能够直接在高频谱效率的调制格式上实现多电平幅度再生。在全光NRZ-PAM4再生实验中，通过优化发射光功率和畸变强度，实现了2.33 dB的综合改进。数值分析了PC-NOLM再生器的均匀再生性能，揭示了再生机理和运行参数对再生性能的影响。
We demonstrate a multilevel amplitude regeneration experiment for non-return-to-zero 4-level pulse amplitude modulated (NRZ-PAM4) signals in the proposed polarization-orthogonal continuous-wave-light-assisted nonlinear-optical loop mirror (PC-NOLM) subsystem. A uniform regenerative behavior including the same noise-suppression efficiency and the noise-handling capability is observed across multiple amplitude levels. The pre-phase modulation is carried out for the input signal enabling the multilevel amplitude regeneration directly on highly-spectral-efficient modulated formats. An overall improvement of 2.33 dB is achieved by optimizing the launched optical power and the distortion strength in the all-optical NRZ-PAM4 regeneration experiment. The uniform regenerative performance for the proposed PC-NOLM regenerator is also analyzed numerically to reveal the regenerative mechanism and the influence from the operational parameters.