题目内容

Write your essay on ANSWER SHEET. (15 points)You should
1) interpret the chart, and
2) give your comments.
You should write about 150 words on the ANSWER SHEET.

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My Dream
My dream has always been to work somewhere in an area between fashion and publishing. Two years beforegraduating from secondary school, I took a sewing and design course thinking that I would move on to a fashiondesign course. However, during that course I realised that I was not good enough in this area to compete with16
other creative personalities in the future, so I decided that it was not the right path for me. Before applying foruniversity I told everyone that I would study journalism, because writing was, and still is, one of my favouriteactivities. But, to be absolutely honest, I said it, because I thought that fashion and me together was just a dream -I knew that no one, apart from myself, could imagine me in the fashion industry at all!

关于色散的说法正确的是()。A.光纤的色散分为两种:一种是色度色散另一种是光纤的偏振模色散(PMD),关于色散的说法正确的是()。

A. 光纤的色散分为两种:一种是色度色散另一种是光纤的偏振模色散(PMD),实际工程中主要考虑的是色度色散。
B. 接入线路中的DCM模块一般添加在可调光衰前面
C. 可以使用G.655LEAF光纤,如果没有采用SuperWDM技术,可以采用DCMForG.652来补偿,补偿的距离需要根据光纤的色散系数进行折算,但是整改光复用段距离不能超过500Km
D. 一个波分系统色散补偿原则主要决定于这几个因素:OTU色散容限、传输光纤色散系数、DCM模块的色散量、被补偿系统的色散代价特性等

某光放板的最大输入光功率为-3dBm,应用在40波的系统,当系统承载10个波道时,其输入光功率的典型值为()Bm。

A. -0.75
B. -9
C. -12
D. -15

为给光信号提供较高的频率精度和稳定度,ITU-TG.692建议中规定了DWDM系统的绝对参考频率为()THz。

A. 192.1
B. 193.1
C. 196.0
D. 196.05

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