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我国实现百公里自由空间时频传递 - 站长搜索
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我国实现百公里自由空间时频传递

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2022-10-06 10:48:26 转载来源: 网络整理/侵权必删

IT之家10月6日消息,据中国科大官网,近日,中国科学技术大学潘建伟团队与上海技物所、新疆天文台等单位合作,通过发展大功率低噪声光梳、高灵敏度高精度线性采样、高稳定高效率光传输等技术,首次在国际上实现百公里级的自由空间高精度时间频率传递实验,时间传递稳定度达到飞秒量级,频率传递万秒稳定度优于4E-19。实验结果有效验证了星地链路高精度光频标比对的可行性,向建立广域光频标网络迈出重要一步

IT之家 10 月 6 日消息,据中国科大官网,近日,中国科学技术大学潘建伟团队与上海技物所、新疆天文台等单位合作,通过发展大功率低噪声光梳、高灵敏度高精度线性采样、高稳定高效率光传输等技术,首次在国际上实现百公里级的自由空间高精度时间频率传递实验,时间传递稳定度达到飞秒量级,频率传递万秒稳定度优于 4E-19。实验结果有效验证了星地链路高精度光频标比对的可行性,向建立广域光频标网络迈出重要一步。IT之家了解到,该成果于 2022 年 10 月 5 日在线发表于国际著名学术期刊《自然》杂志。


近年来,基于超冷原子光晶格的光波段原子钟(光钟)的稳定度已进入 E-19 量级,将形成新一代的时间频率标准(光频标),结合广域、高精度的时间频率传递可以构建广域时频网络,将在精密导航定位、全球授时、广域量子通信、物理学基本原理检验等领域发挥重要作用。例如,当全球尺度时频传递的稳定度达到 E-18 量级时,就可形成新一代的“秒”定义,2026 年国际计量大会将讨论这种“秒”的重新定义。进一步,高轨空间具有更低的引力场噪声环境,光频标和时频传递的稳定度理论上能够进入 E-21 量级,有望在引力波探测、暗物质搜寻等物理学基本问题的研究方面产生重大应用。然而,传统的基于微波的卫星时频传递稳定度仅有 E-16 量级,不能满足高精度时频网络的需求。基于光频梳和相干探测的自由空间时频传递技术,稳定度可以达到 E-19 量级,是高精度时频传递的发展趋势,但此前国际上的相关工作信噪比低、传输距离近,难以满足星地链路高精度时频传递的需求。

在本工作中,研究团队发展了全保偏光纤飞秒激光技术,实现了瓦级功率输出的高稳定光频梳;基于低噪声平衡探测和集成干涉光纤光路模块,结合高精度相位提取后处理算法,实现了纳瓦量级的高灵敏度线性光学采样探测,单次时间测量精度优于 100 飞秒;进一步提升了光传输望远镜的稳定性和接收效率。在上述技术突破的基础上,研究团队在新疆乌鲁木齐成功实现了 113 公里自由空间时频传递,时间传递万秒稳定度达到飞秒量级,频率传递万秒稳定度优于 4E-19,系统相对偏差为 6.3E-20±3.4E-19,系统可容忍最大链路损耗高达 89dB,远高于中高轨星地链路损耗的典型预期值(约 78dB),充分验证了星地链路高精度光频标比对的可行性。


▲百公里高精度时频传递实验示意图

标签: 我国 实现 百公里 自由 间时 传递


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