光谱和功率高效的光通信系统
Spectrally and Power Efficient Optical Communication Systems
摘要：
在全球范围内，特别是在数据中心的短距离链路中，业务需求的增加将要求光通信系统继续以加速的速度扩展。然而，能量约束开始限制实际上可以在数据中心中以最短距离和超长海底链路中以最长距离通过光学系统传输的比特率。数据中心中的短距离链路面临着功耗、尺寸和成本的严格限制，这将需要低功耗解决方案，这些解决方案可以扩展到每波长100 Gbit/s以上的比特率，同时适应由于更长的光纤设备、更多波长的多路复用以及可能的光交换而增加的损耗。在最远距离处，由于海岸处的功率馈送限制，超过约5，000 km的海底光缆面临能量限制，这限制了海底光放大器可用的电功率，最终限制了每根光纤的光功率和吞吐量。本文提出了缓解这些限制的策略。对于数据中心中的短距离链路，我们提出了完全避免高速模数转换器和数字信号处理器的低功耗相干接收器架构。对于长距离海底链路，我们演示了如何优化信道功率分配的约束下的放大器功率最大限度地提高了每光纤的信息理论容量。
英文摘要：
Increased traffic demands globally and in particular in short-reach links in data centers will require optical communication systems to continue scaling at an accelerated pace. Nevertheless, energy constraints start to limit the bit rate that can be practically transmitted over optical systems both at the shortest distances in data centers and at the longest distances in ultra-long submarine links. Short-reach links in data centers face strict constraints on power consumption, size, and cost, which will demand low-power solutions that scale to bit rates beyond 100 Gbit/s per wavelength, while accommodating increased losses due to longer fiber plant, multiplexing of more wavelengths, and possibly optical switching. At the longest distances, submarine optical cables longer than about 5,000 km face energy constraints due to power feed limits at the shores, which restricts the electrical power available to the undersea optical amplifiers, ultimately limiting the optical power and throughput per fiber. This dissertation presents strategies to mitigate these limitations. For short-reach links in data centers, we propose low-power coherent receiver architectures that completely avoid high-speed analog-to-digital converters and digital signal processors. For long-haul submarine links, we demonstrate how optimizing the channel power allocation under a constraint on the amplifier power maximizes the information-theoretic capacity per fiber.
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