Multiband Carrierless Amplitude Phase Modulation for High Capacity Optical Data Links
Multiband Carrierless Amplitude Phase Modulation for High Capacity Optical Data Links
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DOI：
10.1109/jlt.2013.2284926
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发表时间：
2014-02
影响因子：
4.7
通讯作者：
M. I. Olmedo;Tianjian Zuo;J. Jensen;Q. Zhong;Xiaogeng Xu;S. Popov;I. Monroy
中科院分区：
文献类型：
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作者：
M. I. Olmedo;Tianjian Zuo;J. Jensen;Q. Zhong;Xiaogeng Xu;S. Popov;I. Monroy
短距离光数据链路正面临带宽限制，这使得应对日益增长的数据传输容量需求极具挑战性。并行光学似乎是一种有效的短期解决方案。然而，从长远来看，由于其复杂的光学封装，它并不是一个可行的解决方案。因此，现在人们越来越致力于开发具有更高频谱效率且降低光收发器复杂性的高阶调制格式的可能性。由于这类链路基于强度调制和直接检测，依赖于光相干检测的调制格式无法直接应用。作为一种替代且更可行的解决方案，本文提出在一种新颖的多频带方法（MultiCAP）中使用无载波幅度相位（CAP），该方法实现了创纪录的频谱效率，提高了对色散和带宽限制的耐受性，并降低了收发器的复杂性。我们报告了使用单个外调制激光器进行超过100 Gb/s传输容量的数值模拟和实验演示。此外，还提供了与传统CAP的广泛比较。所报道的实验使用MultiCAP实现了102.4 Gb/s的传输，通过使用7%的前向纠错码，对应于95.2 Gb/s无差错传输的数据有效载荷。在一个由14 GHz的3 dB带宽限制的系统中，信号在经过15 km的标准单模光纤后成功恢复。
Short range optical data links are experiencing bandwidth limitations making it very challenging to cope with the growing data transmission capacity demands. Parallel optics appears as a valid short-term solution. It is, however, not a viable solution in the long-term because of its complex optical packaging. Therefore, increasing effort is now put into the possibility of exploiting higher order modulation formats with increased spectral efficiency and reduced optical transceiver complexity. As these type of links are based on intensity modulation and direct detection, modulation formats relying on optical coherent detection can not be straight forwardly employed. As an alternative and more viable solution, this paper proposes the use of carrierless amplitude phase (CAP) in a novel multiband approach (MultiCAP) that achieves record spectral efficiency, increases tolerance towards dispersion and bandwidth limitations, and reduces the complexity of the transceiver. We report on numerical simulations and experimental demonstrations with capacity beyond 100 Gb/s transmission using a single externally modulated laser. In addition, an extensive comparison with conventional CAP is also provided. The reported experiment uses MultiCAP to achieve 102.4 Gb/s transmission, corresponding to a data payload of 95.2 Gb/s error free transmission by using a 7% forward error correction code. The signal is successfully recovered after 15 km of standard single mode fiber in a system limited by a 3 dB bandwidth of 14 GHz.