A Low-Complexity ONU Activation Scheme for TFDMA Coherent PON Systems

IF 2.5 3区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Photonics Technology Letters Pub Date : 2025-09-08 DOI:10.1109/LPT.2025.3607514

Xudong Wang;Yongxin Xu;Xiaokai Guan;Wenqing Jiang;Mengyue Shi;Weisheng Hu;Lilin Yi

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引用次数: 0

Abstract

The emergence and development of new communication services have prompted optical access systems to evolve toward higher speed rates. Coherent passive optical network (PON) based on digital subcarrier multiplexing (DSCM) has become one of the key technologies driving the evolution of optical access networks, owing to its flexible spectrum resource allocation and support for time-frequency division multiple access (TFDMA). In PON systems, a new joining optical network unit (ONU) must achieve upstream synchronization through an activation process. The activation scheme should meet the requirements of future communication services for high capacity and low latency, while imposing minimal impact on the data signal. For the TFDMA-based coherent PON architecture, we propose an innovative low-complexity and low-latency ONU activation scheme without a quiet window, which supports both ranging and frequency offset calibration. To validate the proposed scheme, experiments are conducted in a TFDMA coherent PON system with

$6\times 10$

GHz subcarriers. The experimental results show that the scheme can achieve a time delay estimation accuracy of 2.5 ns, while the impact of the registration signal on upstream data transmission performance is less than 0.2 dB.

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一种低复杂度的TFDMA相干PON系统ONU激活方案

新型通信业务的出现和发展促使光接入系统向更高的速率发展。基于数字子载波复用（DSCM）的相干无源光网络（PON）由于其灵活的频谱资源分配和对时频分多址（TFDMA）的支持，已成为推动光接入网发展的关键技术之一。在PON系统中，新加入的光网络单元（ONU）必须通过激活过程实现上游同步。激活方案应满足未来通信业务对高容量、低时延的要求，同时对数据信号的影响最小。对于基于tfdma的相干PON架构，我们提出了一种创新的低复杂度和低延迟的ONU激活方案，该方案没有安静窗口，同时支持测距和频偏校准。为了验证所提出的方案，在具有$6\ × 10$ GHz子载波的TFDMA相干PON系统中进行了实验。实验结果表明，该方案可实现2.5 ns的时延估计精度，配准信号对上游数据传输性能的影响小于0.2 dB。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Photonics Technology Letters 工程技术-工程：电子与电气

CiteScore

5.00

自引率

3.80%

发文量

404

审稿时长

2.0 months

期刊介绍： IEEE Photonics Technology Letters addresses all aspects of the IEEE Photonics Society Constitutional Field of Interest with emphasis on photonic/lightwave components and applications, laser physics and systems and laser/electro-optics technology. Examples of subject areas for the above areas of concentration are integrated optic and optoelectronic devices, high-power laser arrays (e.g. diode, CO2), free electron lasers, solid, state lasers, laser materials'' interactions and femtosecond laser techniques. The letters journal publishes engineering, applied physics and physics oriented papers. Emphasis is on rapid publication of timely manuscripts. A goal is to provide a focal point of quality engineering-oriented papers in the electro-optics field not found in other rapid-publication journals.