Article(id=1315743771535458977, tenantId=1146029695717560320, journalId=1315121910733963395, issueId=1315743733992243595, articleNumber=null, orderNo=null, doi=10.3788/gzxb20265501.0106002, pmid=null, cstr=32255.14.gzxb20265501.0106002, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1751472000000, receivedDateStr=2025-07-03, revisedDate=null, revisedDateStr=null, acceptedDate=1755792000000, acceptedDateStr=2025-08-22, onlineDate=1791627360470, onlineDateStr=2026-10-10, pubDate=1769270400000, pubDateStr=2026-01-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1791627360470, onlineIssueDateStr=2026-10-10, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1791627360470, creator=13701087609, updateTime=1791627360470, updator=13701087609, issue=Issue{id=1315743733992243595, tenantId=1146029695717560320, journalId=1315121910733963395, year='2026', volume='55', issue='1', pageStart='1', pageEnd='316', issueExtLink='null', onlineDate='null', pubDate='1769270400000', pubDateStr='2026-01-25', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1791627351520, creator='13701087609', updateTime=1791627555456, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1315744589420540350, tenantId=1146029695717560320, journalId=1315121910733963395, issueId=1315743733992243595, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1315744589420540351, tenantId=1146029695717560320, journalId=1315121910733963395, issueId=1315743733992243595, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=20, endPage=28, ext={EN=ArticleExt(id=1315743771745174178, articleId=1315743771535458977, tenantId=1146029695717560320, journalId=1315121910733963395, language=EN, title=Study on the Application of Fiber Array in Laser Ranging Systems, columnId=1315741724413113295, journalTitle=Acta Photonica Sinica, columnName=Fiber Optics and Optical Communications, runingTitle=null, highlight=null, articleAbstract=
All-time laser ranging to space debris is a critical direction in the development of future laser ranging systems. During Earth's shadow periods, however, debris objects receive no solar illumination and are invisible to optical cameras. In these conditions, telescope pointing corrections cannot rely on imaging and must instead depend on echo signal strength. Because debris moves rapidly and orbit prediction errors remain, even targets briefly captured within the field of view quickly drift out. This prevents stable tracking and reduces ranging success rates.
To address this challenge, this study introduces a novel approach by incorporating a fiber array into the laser ranging system. The array consists of a central fiber surrounded by six uniformly arranged multimode fibers. Each fiber is divided into two outputs: one reference fiber of equal length and one guiding fiber of varying lengths. The fourteen outputs are fused into a single fiber, which is then connected to a Superconducting Nanowire Single-Photon Detector (SNSPD). By measuring the relative delays among echo signals, the incident fiber can be identified, enabling calculation of the target's offset direction in the field of view and guiding the telescope for tracking.
Experiments were conducted using the 1.2 m coaxial laser ranging system at Yunnan Observatory during May-June 2025. Cooperative targets with small orbit prediction errors were first selected as observation objects to verify the effectiveness of the fiber array method. After validation, the fiber array method was applied to space debris ranging experiments during Earth's shadow periods. The results demonstrate that the fiber array can effectively enhance the tracking capability of the ranging system for invisible targets. For cooperative targets equipped with retro-reflectors, the system efficiently extracted echo signals and accurately identified the incident fiber, thereby deriving the offset direction and achieving stable and reliable ranging. For non-cooperative debris, the current system shows certain limitations. As shown in Fig. 6(d), debris with NORAD ID 28480 produced strong echoes that allowed identification of the incident fiber as F5. In contrast, debris with NORAD IDs 22220 and 21393, shown in Figs. 6(e)-(f), yielded more dispersed echoes, making it difficult to accurately invert the incident fiber from time-delay information. This phenomenon mainly arises from temporal overlap of signals received by adjacent fibers. Specifically, debris generally exhibits a size effect, where differences in reflection depth across the surface broaden echo signals in the time domain. At the same time, the low surface reflectivity of most debris weakens the echoes and increases their susceptibility to background noise. Together, these factors cause temporal overlap among the multichannel data, which appears in the residual plots as clearly dispersed echo patterns and prevents reliable fiber identification based on inherent time delays.
To improve performance for non-cooperative targets, fiber parameters require targeted optimization. First, the delay difference between reference and guiding fibers should be increased so that the minimum channel separation exceeds three times the ranging precision, thereby reducing signal overlap. Second, the spatial arrangement of the array should be optimized to maximize the average channel delay difference, further suppressing inter-channel interference. Additionally, the current multimode fibers use a core diameter of 62.5 µm and cladding diameter of 125 µm, with the core occupying only 25% of the cross-sectional area. Under weak signals, this may limit detection efficiency. Future designs could reduce cladding thickness to increase area utilization while maintaining low crosstalk, thereby improving overall system performance. In summary, the proposed fiber array method provides a new solution for high-precision tracking of invisible targets and constitutes an important technical step toward all-time space debris laser ranging. With further optimization of fiber parameters, the method offers strong engineering potential and prospects for practical application.
, authors=Junfeng CUI
1, 2, Zhulian LI
1, 3, 4, Zeyu TIAN
1, 2, Dongsheng ZHAI
1, 3, 4, Yuqiang LI
1, 3, 4, authorsList=Junfeng CUI, Zhulian LI, Zeyu TIAN, Dongsheng ZHAI, Yuqiang LI, authorCompany=null, correspAuthors=Dongsheng ZHAI, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1315743774777655983, articleId=1315743771535458977, tenantId=1146029695717560320, journalId=1315121910733963395, language=CN, title=阵列光纤在测距系统中的应用研究, columnId=1315741724673160145, journalTitle=光子学报, columnName=光纤光学与光通信, runingTitle=null, highlight=null, articleAbstract=
针对空间碎片在地影时段无法通过成像系统稳定跟踪,导致测距成功率低的问题,提出了一种基于阵列光纤的测距跟踪方法。该方法在接收端引入由一根中心光纤与六根环绕光纤构成的阵列结构,每根光纤均设置两路输出通道,其中一路为固定长度的基准光纤,另一路为长度各异的指引光纤。根据回波信号的时间延迟识别入射光纤,进而解算出目标相对视场中心的偏移方向,引导望远镜将目标修正至视场中心。将阵列光纤应用于测距系统中,对地影目标开展激光测距实验。实验结果表明,该方法能够实现不可见目标的偏移方向解算与测距跟踪,有效提升了测距系统在地影时段的跟踪能力与测距成功率。
, authors=崔峻烽
1, 2, 李祝莲
1, 3, 4, 田泽宇
1, 2, 翟东升
1, 3, 4, 李语强
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1Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
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1中国科学院云南天文台, 昆明 650216
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1Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
3Key Laboratory of Space Object and Debris Observation, Chinese Academy of Sciences, Nanjing 210023, China
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1中国科学院云南天文台, 昆明 650216
3中国科学院空间目标与碎片观测重点实验室, 南京 210023
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1Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
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1中国科学院云南天文台, 昆明 650216
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1, 3, 4, address=
1Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China
3Key Laboratory of Space Object and Debris Observation, Chinese Academy of Sciences, Nanjing 210023, China
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1中国科学院云南天文台, 昆明 650216
3中国科学院空间目标与碎片观测重点实验室, 南京 210023
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44(11): 3324-3329., articleTitle=空间碎片激光测距应用研究, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1315743775016731313, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, xref=1, ext=[AuthorCompanyExt(id=1315743775071257266, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, companyId=1315743775016731313, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China), AuthorCompanyExt(id=1315743775083840179, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, companyId=1315743775016731313, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1中国科学院云南天文台, 昆明 650216)]), AuthorCompany(id=1315743775146754740, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, xref=2, ext=[AuthorCompanyExt(id=1315743775167726261, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, companyId=1315743775146754740, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2University of Chinese Academy of Sciences, Beijing 100049, China), AuthorCompanyExt(id=1315743775180309174, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, companyId=1315743775146754740, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
2中国科学院大学, 北京 100049)]), AuthorCompany(id=1315743775243223735, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, xref=3, ext=[AuthorCompanyExt(id=1315743775260000952, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, companyId=1315743775243223735, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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3中国科学院空间目标与碎片观测重点实验室, 南京 210023)]), AuthorCompany(id=1315743775503270586, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, xref=4, ext=[AuthorCompanyExt(id=1315743775515853499, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, companyId=1315743775503270586, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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Design of the fiber array, figureFileSmall=IFI7RG/6/QZU4GwRv/p6Og==, figureFileBig=E0vXQnrTPHCb2r3pw/kWug==, tableContent=null), ArticleFig(id=1315743780242834155, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, language=CN, label=图1, caption=
阵列光纤设计, figureFileSmall=IFI7RG/6/QZU4GwRv/p6Og==, figureFileBig=E0vXQnrTPHCb2r3pw/kWug==, tableContent=null), ArticleFig(id=1315743780460937964, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, language=EN, label=Fig.2, caption=
Simulated laser ranging residuals. (a) Simulated residuals of single-channel fiber; (b) Simulated residuals of fiber array, figureFileSmall=sEgGRAgS1GgYMISKTPSAAw==, figureFileBig=RvpdDy+LGhta2qamqVpQzA==, tableContent=null), ArticleFig(id=1315743780515463917, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, language=CN, label=图2, caption=
模拟激光测距残差。(a)单通道光纤测距残差;(b)阵列光纤测距残差, figureFileSmall=sEgGRAgS1GgYMISKTPSAAw==, figureFileBig=RvpdDy+LGhta2qamqVpQzA==, tableContent=null), ArticleFig(id=1315743780582572782, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, language=EN, label=Fig.3, caption=
Optical path diagram of the laser ranging system, figureFileSmall=hpGS2kTuuZhQyE0bvhv22g==, figureFileBig=PMAksgJytt5kTa5EWXFSwQ==, tableContent=null), ArticleFig(id=1315743780649681647, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, language=CN, label=图3, caption=
测距系统光路结构, figureFileSmall=hpGS2kTuuZhQyE0bvhv22g==, figureFileBig=PMAksgJytt5kTa5EWXFSwQ==, tableContent=null), ArticleFig(id=1315743780712596208, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, language=EN, label=Fig.4, caption=
Measured results of fiber array. (a) Spatial distribution of fiber array; (b) Arrangement of fiber array, figureFileSmall=1laMeav+DS2oesy3vIzk5w==, figureFileBig=YsSoBKMqpUf49fbD8LvkNA==, tableContent=null), ArticleFig(id=1315743780771316465, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, language=CN, label=图4, caption=
阵列光纤实测结果。(a)阵列光纤空间分布;(b)阵列光纤排列方式, figureFileSmall=1laMeav+DS2oesy3vIzk5w==, figureFileBig=YsSoBKMqpUf49fbD8LvkNA==, tableContent=null), ArticleFig(id=1315743780838425330, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, language=EN, label=Fig.5, caption=
Echo signal detection of fiber array. (a) Echo signal of central fiber; (b) Echo signal of edge fiber, figureFileSmall=jpBU5vuMjHhpgxqqpkhM9w==, figureFileBig=6DxczuAROY4ArZwDELzEfw==, tableContent=null), ArticleFig(id=1315743780901339891, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, language=CN, label=图5, caption=
阵列光纤回波信号测量。(a)中心光纤回波信号;(b)边缘光纤回波信号, figureFileSmall=jpBU5vuMjHhpgxqqpkhM9w==, figureFileBig=6DxczuAROY4ArZwDELzEfw==, tableContent=null), ArticleFig(id=1315743780981031668, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, language=EN, label=Fig.6, caption=
Laser ranging results of space objects in earth's shadow. (a) Satellite laser ranging data of Stella; (b) Satellite laser ranging data of Lageos-1; (c) Debris laser ranging data of 22076; (d) Debris laser ranging data of 28480; (e) Debris laser ranging data of 22220; (f) Debris laser ranging data of 21393, figureFileSmall=iI0AaiyZ5CQXgM4jiasimg==, figureFileBig=9GOdCYm6Dd23nSNi6Ssb4Q==, tableContent=null), ArticleFig(id=1315743781077500661, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, language=CN, label=图6, caption=
地影时段空间目标激光测距结果。(a)Stella卫星激光测距数据;(b)Lageos-1卫星激光测距数据;(c)碎片22076激光测距数据;(d)碎片28480激光测距数据;(e)碎片22220激光测距数据;(f)碎片21393激光测距数据, figureFileSmall=iI0AaiyZ5CQXgM4jiasimg==, figureFileBig=9GOdCYm6Dd23nSNi6Ssb4Q==, tableContent=null), ArticleFig(id=1315743781152998134, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, language=EN, label=Table 1, caption=
The parameters of fiber array
, figureFileSmall=null, figureFileBig=null, tableContent=
| Fiber endface | Reference fiber length/m | Guidance fiber length/m | Time delay/ns |
|---|
| F1 | 20.1 | 21.2 | 5.32 |
| F2 | 20.1 | 22.2 | 10.15 |
| F3 | 20.1 | 23.2 | 14.99 |
| F4 | 20.1 | 24.2 | 19.82 |
| F5 | 20.1 | 25.2 | 24.66 |
| F6 | 20.1 | 26.2 | 29.49 |
| F7 | 20.1 | 27.2 | 34.33 |
), ArticleFig(id=1315743781245272823, tenantId=1146029695717560320, journalId=1315121910733963395, articleId=1315743771535458977, language=CN, label=表1, caption=
阵列光纤参数
, figureFileSmall=null, figureFileBig=null, tableContent=
| Fiber endface | Reference fiber length/m | Guidance fiber length/m | Time delay/ns |
|---|
| F1 | 20.1 | 21.2 | 5.32 |
| F2 | 20.1 | 22.2 | 10.15 |
| F3 | 20.1 | 23.2 | 14.99 |
| F4 | 20.1 | 24.2 | 19.82 |
| F5 | 20.1 | 25.2 | 24.66 |
| F6 | 20.1 | 26.2 | 29.49 |
| F7 | 20.1 | 27.2 | 34.33 |
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