题目内容

The band of optical fiber communication is in the () region of electromagnetic spectrum.光纤通信的波段在电磁波谱中的()区。

A. 近红外区
B. 远红外区
C. 可见光区
D. 紫外区

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Optical fiber communication refers to:光纤通信指的是:

A. 以电波作载波、以光纤为传输媒介的通信方式;
B. 以光波作载波、以光纤为传输媒介的通信方式;
C. 以光波作载波、以电缆为传输媒介的通信方式;
D. 以激光作载波、以导线为传输媒介的通信方式。

The bandwidth of optical fibers is up to ()光纤的带宽可达()

A. 1MHz
B. 100MHz
C. 1GHz
D. 100THz

At present, the loss of optical fibers at ( ) nm can reach about 0.2dB/km, which is close to the theoretical limit of the loss of optical fibers.目前,光纤在()nm处的损耗可以做到0.2dB/km左右,接近光纤损耗的理论极限值。

A. 1050
B. 1550
C. 2050
D. 2550

The central wavelengths of three low loss windows commonly used in optical fiber communication are ( ), ( ) and ( ).光纤通信中常用的三个低损耗窗口的中心波长分别是()、()和()。

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