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Absolute frequency stabilization of an extended-cavity diode laser at 0.94 μm is reported. The diode laser was frequency locked against rovibrational absorption lines of water vapour by using the frequency modulation spectroscopy technique. The stabilized oscillator shows a short-term frequency stability level of 40 kHz for integration times of 1 s and a long-term frequency drift lower than 10 MHz for observation times longer than 103 s. The frequency-stabilized oscillator system is mounted on a compact breadboard (75 cm×50 cm) and constitutes the seed laser system for the injection of a high-energy DIAL laser transmitter operating in the 0.94-μm spectral region. 相似文献
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4G网络的快速发展,带来了移动互联网数据业务的爆发式增长,XDR信令数据每天8T,业务子类十万以上,所以对数据业务质量的监控变得愈发重要。本文通过对端到端全业务信令信息的采集梳理和重要的域名进行判断,设计开发了智能互联网业务质量拨测分析系统。首先采集了全网的XDR信令并形成分析系统,采用Java语言编写到每个URL的拨测程序。两者相互协作,分析得到的质差URL通过拨测系统验证,拨测系统得到的质差URL返回分析系统分析。拨测软件能方便快捷地配置到各类型的拨测终端上,其单进程每秒1000次的高并发能力也能很好的满足测试需求。数据的分析效率提高70%以上,并能及时发现质差的URL,第一时间处理用户投诉,提高用户感知。 相似文献
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增值业务自动拨测系统是降低增值业务人工拨测工作量,发现增值业务产品问题和评估增值业务产品质量的有效手段。介绍了增值业务拨测平台的基本功能和能力要求,并对平台的模型和建设问题进行了构想和探讨。 相似文献
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提出基于IMS网络的CTD业务平台设计,介绍了CTD平台内部各功能模块及与短信中心、彩信中心、计费、网管等外界系统对接的架构,分析了各分体系的特性。点击拨号所使用的不同场景,提出各种场景所对应的话务模型,通过各种业务需求分析确定平台建设规模,提出计算方法并计算出硬件设备配置,同时提出软件架构。根据网络路由组织原则及网络安全技术要求提出实现该业务功能的网络连接方案。最后根据现网电信运营商应用情况,对CTD平台进行分析总结。 相似文献
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S. Amoruso A. Amodeo M. Armenante A. Boselli L. Mona M. Pandolfi G. Pappalardo R. Velotta N. Spinelli X. Wang 《Optics and Lasers in Engineering》2002,37(5)
A differential absorption lidar system (DIAL) based on a continuously tunable optical parametric amplifier (OPA) pumped by a Nd : YAG laser (200 mJ at λ=355 nm) operating at a maximum pulse repetition rate of 100 Hz has been developed. The system provides continuously tunable coherent radiation in the Visible–near IR range (0.4–2.5 μm), allowing to perform DIAL measurements in a spectral region where most of atmospheric constituents and pollutants display absorption lines. The spectral width of the OPA system is line-narrowed by using a master oscillator dye laser as seeder, achieving a linewidth of 0.04 cm−1 (FWHM), a spectral purity larger than 99% and a frequency stability better than 1 pm h−1, with an output energy in the IR of 1–10 mJ. The OPA system was used to perform DIAL measurements in the lower troposphere. Preliminary results in terms of water vapor content and aerosol backscattering profiles are presented and discussed. 相似文献
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本文着重阐述如何在局域网内利用Cisco路由器 ,使远端计算机用户可以在任何地方通过廉价的IS DN或模拟电话拨号连接到企业内部局域网 ,实现远程网络维护、远程办公和开展业务等功能 相似文献
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