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杨东 《功能材料与器件学报》2014,(5):140-144
全光通信网络是光通信发展的必然趋势,光无源器件是组建全光通信网络的重要元器件。通过介绍光无源器件——光纤活动连接器、光分路器、隔离器、衰减器、光波分复用器在有线电视(CATV)网络中的使用情况,分析了常用光无源器件的性能参数。结合有线电视网的发展状况,设计出光无源器件在有线电视网络改造中的应用。 相似文献
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光电信息技术的某些发展前沿 总被引:1,自引:1,他引:0
本文着重如下内容 :1.波长路由在光互连中的应用 :提出适用于环网的光互连接口 (OII)组件和波长路由交换器件 (WRS)的设计 .网络为多层结构 ,第一层为λ1子环网 (RSN) ,第二层为λ2 子环网等 ,层间通过 WRS连接 .2 .微机电系统 (MEMS)可能在下一代通信网络中占重要地位 :随着信息技术的发展 ,使微电子信息处理向系统级芯片技术发展 ,从微型化或性能价格比来看 ,把信息获取、处理和执行集成在一起的微机电系统 (MEMS) ,特别是光机电一体化集成芯片 ,或称为微光机电系统 (OpticalMEMS或 MOEMS)是很合理的 .3.结合光通信中 WDM技术的发展 ,研究了用用一块光栅模板在 Tal-bot干涉仪上刻写多种频率的光纤 Bragg光栅 . 相似文献
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《纳米技术与精密工程》2016,(3)
为了实现2μm波段多波长激光输出,提出并设计了一种基于Sagnac环形滤波结构的多波长掺铥光纤激光器.激光器由波长793 nm的泵浦源、波分复用器、光纤耦合器、保偏光纤、掺铥光纤以及偏振控制器构成,其中Sagnac环形滤波器以及光纤环形镜作为激光器的反射端.实验中,激光器工作阈值为77.5 m W,通过调节偏振控制器,实现了稳定的单波长激光输出.波长为1 852.8 nm的单波长激光输出时,在50 min监测时间内波长最大漂移为0.1 nm,功率最大漂移为0.252 d B,激光3 d B线宽和信噪比分别为0.3 nm和35.7 d B.通过调节偏振控制器,在1 850~1 900 nm光谱范围内实现了1~4波长的激光输出. 相似文献
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介绍一种微流控阵列光开关芯片,通过对光开关中微流体位置的控制,来控制光路中的光束的透射及全反射,以此实现光的"开"和"关"的动作.讨论光开关的耦合损耗等参数.该器件具有结构简单、功耗低、能实现集成化和微型化制作等特点. 相似文献
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提出并制作了转动竖直微镜的微机械光开关,采用曲线形状的电极设计,有效地减低了悬臂梁驱动器的吸合电压,采用体硅深刻蚀技术结合(110)硅的各向异性腐蚀技术制备了光开关芯片和耦合对准的U形槽和卡簧。芯片经初步封装后进行了电学测试和光学测试,测得吸合电压78.5V,谐振频率2.3kHz,光开关损耗5dB,隔离度45dB。 相似文献
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Standards are the basis for production enterprises to organize production ex-factory inspection trade 《中国标准化(英文版)》2008,25(1):24-25
Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.…… 相似文献
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Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß. 相似文献
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《中国标准化(英文版)》2014,(4)
正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from 相似文献
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《中国标准化(英文版)》2014,(5)
正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively. 相似文献
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《中国标准化(英文版)》2014,(4)
正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to 相似文献
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刘智洋 《中国标准化(英文版)》2014,(4):M0002-M0002
正The Chinese Premier Li Keqiang's recent trip to the UK has reinforced the China-UK comprehensive strategic partnership;just as the British Prime Minister David Cameron put it,"the relationship is gaining in strength,depth and understanding"after a bucket of business deals being inked worth more than 30 billion US dollars.From the first agreement signing in 2004 to the new agreement of mutual standards recognition and adoption in 相似文献
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《中国标准化(英文版)》2014,(4):3-3
正A national directory of standards complexes for strategic emerging sectors was recently developed and released jointly by 12governmental departments,namely,SAC,NDRC,MOST,MIIT,MEP,MOA,AQSIQ,State Forest Administration,State Administration of Science and Technology for National Defense,State Oceanic Administration and National Railway Administration. 相似文献
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《中国标准化(英文版)》2014,(4)
正Four new national standards on air pollutant emission control offi cially issued by the Ministry of Environment Protection(MEP)together with AQSIQ and SAC has been brought into force from July 1,2014.The Emission standard for air pollutants of coal-burning,oil-burning and gasfi red boilers,which is the strictest emission standard historically,will tackle the stubborn pollution problem of boilers and waste incineration in most of China’s regions. 相似文献
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《新型炭材料》2014,(6):460
New Carbon Materials is a bimonthly journal published with the permission of the Ministry of Science and Technology and of the State News and Publication Agency.The journal is sponsored by the Institute of Coal Chemistry,Chinese Academy of Sciences,and is published by Science Press.Aims and Scope 相似文献
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《中国标准化(英文版)》2014,(5):3-3
正Recently,National Copyright Administration of China(NCAC)has rewarded 215 organizations and 179 individuals for their outstanding efforts on investigating standards copyright infringement and piracy in 2013.Hua Jianhua,the Deputy-Director of National Standards Copyright Protection Workgroup Office won a third prize of the national individual award.In 2012,SAC set up the national standards copyright protection working group,and developed policies to crack down standards infringement and piracy behaviors and to strengthen standards copyright protection. 相似文献