{"title":"Quadrant-partitioning uniformly distributed modulation for amplifier-free optical coherent systems.","authors":"Ziheng Zhang, Lizhi Wen, Yi Cai, Jian Zhao","doi":"10.1364/OL.551968","DOIUrl":null,"url":null,"abstract":"<p><p>Amplifier-free coherent systems are promising for short-reach links, but these systems are constrained by signal peak power instead of average power. In this paper, we propose a novel, to the best of our knowledge, quadrant-partitioning uniformly distributed modulation (QP-UDM) scheme for peak-power-constrained amplifier-free systems. The proposed scheme achieves finer modulation orders than conventional UDM schemes. It also avoids the problem in conventional amplitude-division irregular quadrature amplitude modulation, where the order of check bit sequence would be disrupted when there are errors, resulting in the failure of forward error correction decoding. When compared to probabilistic shaping (PS), the proposed QP-UDM has a lower peak-to-average-power ratio. Experiments of a 28 Gbaud amplifier-free system with the modulation order varying from 36 to 104 show that the proposed QP-UDM scheme solves the problem of conventional UDM schemes and outperforms PS-QAM at the same entropy.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 5","pages":"1597-1600"},"PeriodicalIF":3.1000,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1364/OL.551968","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
Amplifier-free coherent systems are promising for short-reach links, but these systems are constrained by signal peak power instead of average power. In this paper, we propose a novel, to the best of our knowledge, quadrant-partitioning uniformly distributed modulation (QP-UDM) scheme for peak-power-constrained amplifier-free systems. The proposed scheme achieves finer modulation orders than conventional UDM schemes. It also avoids the problem in conventional amplitude-division irregular quadrature amplitude modulation, where the order of check bit sequence would be disrupted when there are errors, resulting in the failure of forward error correction decoding. When compared to probabilistic shaping (PS), the proposed QP-UDM has a lower peak-to-average-power ratio. Experiments of a 28 Gbaud amplifier-free system with the modulation order varying from 36 to 104 show that the proposed QP-UDM scheme solves the problem of conventional UDM schemes and outperforms PS-QAM at the same entropy.
期刊介绍：
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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