NTT可编程光电路在1300公里光传输实验中把信号时间扩散减少约60%：11月13日公布，成果曾刊于《自然·光子学》
NTT 11月13日公布一项可编程光电路技术，可在光网络中途灵活控制光信号。在1300公里长距离光传输实验中，这项技术把信号的时间扩散减少了约60%。信号时间扩散是接收端数字信号处理负担加重的成因之一，减少扩散意味着接收端需要处理的校正工作随之下降。
这项成果此前已于2026年9月25日刊于《自然·光子学》。论文报告的实验采用参数化空间分工复用传输方案，在传输线路的中继节点安装可编程光子酉处理器，在光域内先行补偿模态色散，而不是把全部校正都留给接收端的数字处理。
实验所用的光子处理器建在硅基平面光波导电路平台上，芯片尺寸为50毫米乘25毫米，内含8乘8的马赫曾德尔干涉仪网格。实验信号以12吉波特的偏振复用正交相移键控格式，在每跨51.2公里的渐变折射率三模光纤环路中循环传输。
论文报告，传输1331公里后，各个空间与偏振模式的归一化广义互信息都保持在0.836的无误码门限之上，星座图保持清晰聚集。研究团队称，这显示低损耗、对偏振不敏感的处理器在全程保持了信号质量。
NTT 表示将面向数据中心互联与海底光缆等应用继续推进研发。此次实验属于长距离光传输验证，成果何时进入商用网络尚未确定，公布材料未给出部署时间表。
NTT Programmable Optical Circuit Cuts Signal Temporal Spread by About 60 Percent in 1,300 km Transmission Experiment Announced November 13
NTT announced on November 13 a programmable optical circuit technology that can flexibly control optical signals partway along an optical network. In a 1,300 kilometer long-haul optical transmission experiment, the technology reduced the temporal spread of the signal by about 60 percent. Temporal spread is one of the causes of heavier digital signal processing load on the receiver side, so reducing it lowers the correction work the receiver must perform.
The results were published earlier in Nature Photonics on September 25, 2026. The paper reported a parameterized spatial division multiplexed transmission scheme that installs programmable photonic unitary processors at intermediate nodes along the line, compensating for modal dispersion in the optical domain instead of leaving all correction to digital processing at the receiver.
The photonic processor used in the experiment was built on a silica-based planar lightwave circuit platform. The chip measures 50 by 25 millimeters and implements an 8-by-8 Clements-type mesh of Mach-Zehnder interferometers. The experimental signal used 12-gigabaud polarization-multiplexed quadrature phase-shift keying, circulated through a recirculating loop with 51.2 kilometers of graded-index three-mode fiber per span.
After 1,331 kilometers of transmission, the paper reported, the normalized generalized mutual information of every spatial and polarization mode remained above the 0.836 error-free threshold, with cleanly clustered constellations. The team said this showed the low-loss, polarization-insensitive processor preserved signal quality end to end.
NTT said it will pursue research and development with applications such as data center interconnects and submarine cables in mind. The work is a long-haul transmission experiment, and the announcement materials gave no timetable for deployment in commercial networks.
来源：NTT
发布：GSM·美国（发布链接）
图片来源：图：可编程光电路传输实验的论文图示。来源：NTT 官方发布。 / Photo: Figure from the programmable optical circuit transmission study. Credit: NTT.
GSM Global · 本篇英文版 English edition of this story
