Waveband-Shift-Free Optical Phase Conjugator for Spectrally Efficient Fiber Nonlinearity Mitigation
Waveband-Shift-Free Optical Phase Conjugator for Spectrally Efficient Fiber Nonlinearity Mitigation
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DOI：
10.1109/jlt.2018.2790799
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发表时间：
2018-03-15
影响因子：
4.7
通讯作者：
Schubert, Colja
中科院分区：
文献类型：
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作者：
Sackey, Isaac;Schmidt-Langhorst, Carsten;Schubert, Colja
我们讨论了一种新型宽带、偏振不敏感且无波长漂移的光学相位共轭器 (OPC)。在 OPC 方案中，原始输入信号在偏振分集环路设置中受到固有抑制。这允许在连续工作频带上产生光谱高效、无波长（带）偏移的相位共轭闲频信号。闲频信号是通过使用带外正交偏振泵浦波在非线性光纤中进行四波混频来生成的。研究了所开发的非线性混合过程的饱和特性以及 OPC 分集环路方案的串扰特性。 OPC 子系统最终用于在色散管理光纤跨度上进行 800 公里传输实验，通过掺铒光纤放大器的集总放大，通过中间链路频谱反转来减轻光纤非线性。在由八个 200 Gb/s 偏振复用 16 进制正交幅度调制子通道组成的 300 GHz 宽 1.6 Tb/s 超级通道的传输中，Q(2) 因子提高了高达 0.7 dB。
We discuss a novel broadband, polarization-insensitive, and wavelength-shift-free optical phase conjugator (OPC). In the OPC scheme, the original input signal is inherently suppressed in a polarization-diversity loop setup. This allows for spectrally efficient, wavelength-(band)-shift-free generation of phase-conjugated idlers over a continuous operating band. The idlers are generated using four-wave mixing in nonlinear fibers using out-of-band, orthogonally polarized pump waves. The saturation characteristics of the exploited nonlinear mixing process as well as the crosstalk characteristics of the OPC diversity loop scheme are investigated. The OPC subsystem is finally utilized for fiber nonlinearity mitigation by midlink spectral inversion in 800-km transmission experiments over dispersion-managed fiber spans with lumped amplification by Erbium-doped fiber amplifiers. Q(2)-factor improvements of up to 0.7 dB are obtained in transmission of a 300-GHz wide 1.6 Tb/s super channel consisting of eight 200 Gb/s polarization division multiplexed 16-ary quadrature amplitude modulation subchannels.