首页
登录
职称英语
In the early 1950s the researchers who produced the first clad glass optical
In the early 1950s the researchers who produced the first clad glass optical
游客
2023-10-18
75
管理
问题
In the early 1950s the researchers who produced the first clad glass optical fibers were not thinking of using them for communications.【46】H______, fiber optics was already a well-established commercial technology when the famous paper by Kao and Hockham,【47】______ (claim) the use of low-loss optical fibers for communication, appeared in 1966. The first low-loss silica fiber was described in【48】______which appeared in October of 1970. The date of this publication is sometimes【49】______(cite) as the beginning of the era of fiber communication. Although this development did receive【50】______ (consider) attention in the research community at the time, it was far from inevitable that a major industry would evolve.
The technological barriers appeared formidable because there were serious doubts as to【51】 wh______these fiber components could ever be produced economically enough, but the market potential was very significant.【52】______(consequence) , research and development activity expanded rapidly, and a number of important issues were【53】re______during the early 1970s. During the middle and late 1970s, the rate of progress towards marketable products accelerated as the emphasis【54】______(shift) from research to engineering. Fibers with losses【55】app______the Rayleigh limit of 2 dB/km at a wavelength of 0. 8 μm were produced.
By 1980 improvement in component performance, cost, and reliability led to major commitments on the part of telephone companies. [br]
选项
答案
approaching
解析
approaching the Rayleigh limit接近瑞利极限。
转载请注明原文地址:https://tihaiku.com/zcyy/3109499.html
相关试题推荐
(1)Menandwomentendtochoosedifferentcareerpaths,andresearchershav
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
Intheearly1950stheresearcherswhoproducedthefirstcladglassoptical
随机试题
Pricequotes______.A、havedailybeenannouncedB、havebeenannounceddailyC、da
Insomecountrieswhereracialprejudiceisacute,violencehassocometob
Thereportbelievesthatsomecompaniestendtofalsifyabloodtestresult.[br
Scholarsoftheinformationsocietyaredividedoverwhethersocialinequali
初次发行新股的发行人应在招股说明书中披露的关联方主要包括()。
肺痨的病理性质基本以……为主A.阴虚肺燥 B.气阴两虚 C.阴虚 D.阴阳
根据资料,下列表述不正确的是:() A.2010年末T市各类福利院有床位不
(2018年真题)经济全球化是指商品、服务、生产要素与信息跨国界流动的规模与形式
什么是创造性?教学中如何培养学生的创造性。
建设工程风险评价的主要作用在于确定()。 A.风险损失值的大小B.风
最新回复
(
0
)