Spectrally Efficient Long-Haul Optical Networking Using 112-Gb/s Polarization-Multiplexed 16-QAM
Spectrally Efficient Long-Haul Optical Networking Using 112-Gb/s Polarization-Multiplexed 16-QAM
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DOI：
10.1109/jlt.2009.2031922
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发表时间：
2010-02-15
影响因子：
4.7
通讯作者：
Buhl, L. L.
中科院分区：
文献类型：
--
作者：
Winzer, P. J.;Gnauck, A. H.;Buhl, L. L.
我们讨论的产生，波分复用（WDM）的长途传输，和相干检测的112 Gb/s的偏振分多路复用（PDM）的16进制正交幅度调制（16-QAM）在14 Gbaud的线速率和频谱效率超过4 B/s/Hz。我们描述了（离线）数字信号处理和盲滤波器自适应算法在我们的内差接收机，并使用模拟和测量的16-QAM波形表征其性能。我们测量所需的光信噪比为20.2 dB（0.1 nm参考带宽; 10（-3）误码率），3.2 dB的理论极限。我们研究了有限模数转换器分辨率、激光频率偏移、激光相位噪声和窄带光学滤波的影响。我们在25 GHz WDM网格（4.1-B/s/Hz频谱效率）上的实验揭示了7次通过可重构光分插复用器（ROADM）后的1 dB损失，以及未补偿标准单模光纤的1022 km可实现传输范围。在频谱效率为6.2 B/s/Hz（16.67-GHz WDM信道间隔）的情况下，达到630 km的传输范围。
We discuss the generation, wavelength-division-multiplexed (WDM) long-haul transmission, and coherent detection of 112-Gb/s polarization-division-multiplexed (PDM) 16-ary quadrature amplitude modulation (16-QAM) at a line rate of 14 Gbaud and spectral efficiencies beyond 4 b/s/Hz. We describe the (off-line) digital signal processing and blind filter adaptation algorithms used in our intradyne receiver and characterize its performance using both simulated and measured 16-QAM waveforms. We measure a required optical signal-to-noise ratio of 20.2 dB (0.1-nm reference bandwidth; 10(-3) bit-error ratio), 3.2-dB off the theoretical limit. We study the effects of finite analog-to-digital converter resolution, laser frequency offset, laser phase noise, and narrowband optical filtering. Our experiments on a 25-GHz WDM grid (4.1-b/s/Hz spectral efficiency) reveal a 1-dB penalty after 7 passes though reconfigurable optical add/drop multiplexers (ROADMs) and an achievable transmission reach of 1022 km of uncompensated standard single-mode fiber. At a spectral efficiency of 6.2 b/s/Hz (16.67-GHz WDM channel spacing) a transmission reach of 630 km is attained.