[论文解读] Optical data transmission at 44Tb/s and 10 bits/s/Hz over the C-band with standard fibre and a single micro-comb source

Bill Corcoran, Mengxi Tan+9 more|arXiv (Cornell University)|Mar 1, 2020

Advanced Fiber Laser Technologies参考文献 54被引用 30

一句话总结

展示利用单个微梳源在 C 波段 (1550 nm) 实现 44.2 Tb/s 的线速，达到 10.4 bits/s/Hz，在实验室和实地试验中实现 75 km 无误码传输。

ABSTRACT

Micro-combs [1 - 4], optical frequency combs generated by integrated micro-cavity resonators, offer the full potential of their bulk counterparts [5,6], but in an integrated footprint. The discovery of temporal soliton states (DKS dissipative Kerr solitons) [4,7-11] as a means of modelocking microcombs has enabled breakthroughs in many fields including spectroscopy [12,13], microwave photonics [14], frequency synthesis [15], optical ranging [16,17], quantum sources [18,19], metrology [20,21] and more. One of their most promising applications has been optical fibre communications where they have enabled massively parallel ultrahigh capacity multiplexed data transmission [22,23]. Here, by using a new and powerful class of microcomb called soliton crystals [11], we achieve unprecedented data transmission over standard optical fibre using a single integrated chip source. We demonstrate a line rate of 44.2 Terabits per second using the telecommunications C band at 1550nm with a spectral efficiency, a critically important performance metric, of 10.4 bits/s/Hz. Soliton crystals exhibit robust and stable generation and operation as well as a high intrinsic efficiency that, together with a low soliton microcomb spacing of 48.9 GHz enable the use of a very high coherent data modulation format of 64 QAM (quadrature amplitude modulated). We demonstrate error free transmission over 75 km of standard optical fibre in the laboratory as well as in a field trial over an installed metropolitan optical fibre network. These experiments were greatly aided by the ability of the soliton crystals to operate without stabilization or feedback control. This work demonstrates the capability of optical soliton crystal microcombs to perform in demanding and practical optical communications networks.

研究动机与目标

• 证明单一微梳源能够在标准光纤中实现超高容量的光传输
• 利用孤子晶体微梳实现稳定、高效的高阶调制，无需反馈控制
• 展示在已布设的光纤网络中的长距离、无错误传输，包括现场试验

提出的方法

• 使用间距为 48.9 GHz 的孤子晶体微梳以支持高相干数据调制
• 在 1550 nm 的 C 波段进行传输，最高支持 64-QAM，以实现高光谱效率
• 在实验室和现场测试中展示 44.2 Tb/s 的线速和 10.4 bits/s/Hz
• 在不进行稳定化或反馈控制的情况下运行，以显示源的鲁棒性
• 在标准光纤上进行 75 km 实验室距离和在大都市网络中的性能评估

实验结果

研究问题

• RQ1 单一微梳源是否能够在 C 波段的标准光纤上实现多 Tb/s 的数据传输？
• RQ2 利用像 64-QAM 这样的高阶调制，孤子晶体微梳能达到的光谱效率（bits/s/Hz）是多少？
• RQ3 在实际距离（如 75 km）上，单一微梳源在无主动稳定化的情况下是否可能实现无错误传输？
• RQ4 孤子晶体微梳在实验室光纤网络与现场光纤网络中的表现有何差异？
• RQ5 在高容量光纤通信中，集成光子学的实际意义有哪些？

主要发现

• 在 C 波段使用单一微梳源实现了 44.2 Tb/s 的线速
• 达到 10.4 bits/s/Hz 的光谱效率
• 在实验室和现场试验中，在标准光纤的 75 km 范围内实现了无错误传输
• 使用间距为 48.9 GHz 的孤子晶体，支持 64-QAM 调制
• 观察到在无稳定化或反馈控制的情况下的鲁棒运行