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1、Unit 16 A. Text,Optical Communications,New Words and Expressions,indicator 5indikei n. 标志,指示(器) dispersion dis5pE:FEn n. 散布,散射 emission i5miFEn n. 散发,发射 chirp tFE:p n. 喳喳声, 唧唧声 boost bu:st v. n. 推进 arena E5ri:nE n. 竞技场, 舞台 trunking 5trQNkiN n. 中继 impose im5pEuz v. 征税,利用 abnormal Ab5nC:mEl adj. 反常的,变
2、态的 backed by 有支持的,Technical Terms,multiple multiplex 多路复用 multi-mode system 多模系统 single-mode system 单模系统 Dispersion Shift Fiber 色散位移光纤,O/E conversion ( Optical/Electronic conversion ) 光/电转换 NZ-DSF ( the Non-zero Dispersion Shift Fiber ) 非零色散位移光纤 LEAF ( the Large Effective Area Fiber ) 大有效面积光纤 LDSF (
3、 the Low Dispersion Slop Fiber ) 低色散斜率光纤 ADF ( the Abnormal Dispersion Fiber ) 反常色散光纤,Notes,1. A main indicator of the technological advancement of optical communication in the past 30 years is the annual growth in transmission capacity, which is physically reflected in the progress made three aspec
4、ts: the optical appliance, multiple multiplexing modes and novel optical network protocols. 过去30年光通信技术发展的主要标志是传输容量的逐年增长， 技术发展主要表现在光器件、多种复用方式和新颖的光网络协议。 该句为复合句，其主句的主干结构是 A main indicator is the annual growth ; which is physically reflected 是非限制性定语从句。,2. The zero dispersion point of the ordinary single
5、-mode fiber is in the neighborhood of 1.31m, whereas DSF has shifted the point from 1.31m to 1.55m, thus effective solving the dispersion problem of the 1.55m system. 普通单模光纤的零色散点在1.31m附近，色散位移光纤将零色散点从1.31m移到1.55m，有效地解决了1.55m光通信系统的色散问题。 whereas 是并列连句, 所连接的并列句, 表示一种转折关系；前一分句是一个系表结构 The point is in the
6、neighborhood; 后一分句中的 thus system 是现在分词短语作状语。,3. The optical source used in the optical communications system has evolved from the Light Emission Diode (LED) to the Semiconductor Laser, which can not only work at the room temperature, but also offer a modulation rate of up to 10Gbit/s or even higher.
7、 光纤通信系统中使用的光源从发光二极管发展到半导体激光器，目前，半导体激光器不仅可在室温下工作，而且其调制速率可达到10Gbit/s甚至更高。 Which 引导一个非限制性定语从句；主句的主干结构是 The optical source has evolved，其中 used system 是过去分词短语作后置定语。,4. The annual progress in areas of the optical fiber and optical source finally settled plaguing headaches of attenuation and dispersion, re
8、sulting in a boost in the communications capacity of the fiber optics system. 光纤与光源的逐年发展最终解决了衰减和色散问题，其结果是光纤系统的通信容量的大幅度增加。 句中 plaguing headaches 意为“令人烦恼的问题”； resulting in system 是现在分词作结果状语。,I. Try to match the following columns: 1. transmission capacity 单模系统 2. non-linear effect 发光二极管 3. fiber amplif
9、ier 非线性影响 4. multiple multiplex 多模系统 5. singlemode system 色散位移光纤 6. the semiconductor laser 传输能力 7. Dispersion Shift fiber 光纤放大器 8. multimode system 半导体激光器 9. Light Emission Diode 多路复用 10. Wavelength Division Multiplex 波分复用,Exercises,1. 传输能力 2. 非线性影响 3. 光纤放大器 4. 多路复用 5. 单模系统 6.半导体激光器 7. 色散位移光纤 8.多模系
10、统 9.发光二极管 10.波分复用,. Choose the one that best completes each of the following statements according to the text: 1. As a basic transmission medium, the fiber optics system in the past decades three generations. A. experienced B. has experienced C. experiences D. has been experienced 2. The optical sou
11、rce used in the communications system has evolved from the Light Emission Diode to the Semiconductor Laser, which can not only work at the room temperature, but also offer a modulation rate of up to 10Gbit/s or even higher. Aoptic B. optical C. light D. opticis,B,B,3. The fiber amplifier born in the
12、 1980s in the optical communications arena. Amake B. made C. bring D. brought 4. The invention of fiber amplifier and the adoption of WDM technology technicians an unavoidable fact: the non-linear effect of fiber optics. Adepend on B. impressed on C. imposed on D. depended on 5. While the fiber ampl
13、ifier is widely applied in the new-generation WDM system, the research on amplifiers never ceased. Amore advanced B. advanced C. advancer D. advance,D,C,A,B. Reading Information Technology New Words and Expressions incredibly in5kredEblI adv. 不能相信地 emphasize 5emfEsaIz v. 强调，着重 challenge 5tFAlindV n.
14、& vt. 挑战，对抗 kill two birds with one stone 一石两鸟、一箭双雕,Technical Terms,Information Technology (IT) 信息技术 international standard language 国际标准语言,Exercises,Decide whether the following statements are true or false: 1. Information Technology has reshaped the way people work and live in recent years in many
15、 countries. 2. It is easy to know which technologies to use, and understand how different products and companies relate to each other for everyone. 3. IT products can help people do their job better, faster, and cheaper. 4. According to the text, English is the current international standard language of the IT industry. 5. English will help you advance in your career and be a better and more effective employee if you work in an international company.,T F T T T,
