文档介绍：Unit 7
WDM
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Contents
Revision .
Pre-reading Activities
While-reading Activities
New words and phrases
anization
Text and translation
Post-reading Activities
Further Development of the Theme-related Specialized Knowledge
Assignments
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Revision
1. What have we studied in the Unit 6?
Possible answers: SDH
2. What is SDH?
Possible answers: SDH is an International Standard for high-speed synchronous optical works---a Synchronous Digital Hierarchy.
3. Tell us the main application of SDH?
Possible answers: The SDH signal is capable of transporting all mon tributary signals found in today's works.
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Pre-reading Activities
Ask the Ss the following two questions related to the theme of the text:
Can you enumerate what you contacted in the study of the courses including munications?
Possible answers: optical fiber, OA, FTTB, FTTO, FTTN, FTTH, etc.
What is the application of optical fiber? Do you know anything about WDM?
Possible answers: optical fiber is a transmission medium through which numerous signals are transmitted , it can be used to build works . Wavelength Division Multiplexing (WDM) enables the utilization of a significant portion of the available fiber bandwidth by allowing many independent signals to be transmitted simultaneously on one fiber, with each signal located at a different wavelength. (The Ss might be encouraged to discuss this topic before class either in English or in Chinese.)
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While-reading Activities / New words and phrases
visionary ['viənəri] n. 幻想家,梦想家
contribute [kən'tribjut] ,贡献
significant [sig'nifikənt] adv. 重大的,效果显著的,具有特殊意义的
property ['prprəti] ,房产,所有权
fundamental [fndə'mentl'] adj. 基础的,重要的,本性的
span [spn] ,延伸
twinkle [' twikl] ,闪耀,眨眼
equivalent [ i' kwivələnt] ,同等
traffic [' trfik] ,通信量,交易
ample ['mpl] ,充分的,宽敞的
evidence ['evidəns] ,证词
phenomena [fi'nmino] n. 单数为phenomenon n. 现象
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While-reading Activities / New words and phrases
unify ['ju: nifai] ,使化一,统一
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