大学MOOC Optical Fiber Communications Engineering(南京信息职业技术学院)1458303162 最新慕课完整章节测试答案

Practise

1、单选题：
"Optical fiber communication" refers to (   )‌
选项：
A: A communication mode in which radio waves are used as carriers and optical fibers are used as transmission media.
B: A communication mode in which optical waves are used as carriers and optical fibers are used as transmission media.
C: A communication mode in which optical waves are used as carriers and cables are used as transmission media.
D: A communication mode in which laser is used as carriers and optical fibers are used as transmission media.
答案: 【 A communication mode in which optical waves are used as carriers and optical fibers are used as transmission media.】

2、单选题：
The three wavelengths used in optical fiber communication are (   )‌
选项：
A: λ=0.85um，λ=1.20um，λ=1.80um
B: λ=0.80um，λ=1.51um，λ=1.80um
C: λ=0.85um，λ=1.31um，λ=1.55um
D: λ=0.85um，λ=1.20um，λ=1.80um
答案: 【 λ=0.85um，λ=1.31um，λ=1.55um】

3、单选题：
The function of the photodetector is (      )​
选项：
A: Convert an optical signal into an electrical signal
B: Convert an electrical signal into an optical signal
C: Amplify electrical signal
D: Amplify optical signal
答案: 【 Convert an optical signal into an electrical signal】

4、单选题：
The spectrum of optical fiber communication belongs to (    )‎
选项：
A: Visible light
B: Ultraviolet light 
C: Infrared light
D: X-ray
答案: 【 Infrared light】

5、单选题：
​The production material of optical fiber is (      )‌
选项：
A: Copper
B: Iron
C: Compound
D: Quartz
答案: 【 Quartz】

6、判断题：
The disadvantage of optical fiber communication is high transmission loss.‌
选项：
A: 正确
B: 错误
答案: 【 错误】

7、判断题：
‏Optical fiber can be connected directly without special tools.‏
选项：
A: 正确
B: 错误
答案: 【 错误】

8、判断题：
The function of photodiodes is to convert optical signals into electrical signals.‌
选项：
A: 正确
B: 错误
答案: 【 正确】

9、判断题：
The first laser was a ruby laser.‎
选项：
A: 正确
B: 错误
答案: 【 错误】

10、判断题：
‍The laser commonly used in communication is semiconductor laser.‏
选项：
A: 正确
B: 错误
答案: 【 正确】

Test 11

1、单选题：
‍What is the wavelength of ultra long wavelength infrared optical communication？‏‍‏
选项：
A: 2~5 in microns
B: 5~10 in microns
C: 10~15 in microns
D: 15~20 in microns
答案: 【 2~5 in microns】

2、多选题：
‍What technologies are involved in the new optical communication technologies？‎‍‎
选项：
A:  Optical soliton communication technology
B: Ultra long wavelength optical fiber communication technology
C: Coherent optical fiber communication technology
D: Optical wavelength division multiplexing technology
答案: 【  Optical soliton communication technology;
Ultra long wavelength optical fiber communication technology;
Coherent optical fiber communication technology;
Optical wavelength division multiplexing technology】

3、多选题：
‍Which two technologies are used in coherent optical communication technology？‌‍‌
选项：
A: Envelope detection technology
B: Heterodyne detection technology
C: Coherent modulation technology
D: OFDM technology
答案: 【 Heterodyne detection technology;
Coherent modulation technology】

4、多选题：
​Compared with linear optical fiber communication, optical soliton communication has a series of significant advantages, including:‌​‌
选项：
A: The transmission capacity is 1~2 orders of magnitude larger than that of the best linear communication system.
B: Optical arc sub communication system can carry out all-optical relay.
C: Optical soliton communication is superior to intensity modulation / direct detection and coherent optical communication in high fidelity and long-distance transmission.
D: Wide transmission band and large communication capacity.
答案: 【 The transmission capacity is 1~2 orders of magnitude larger than that of the best linear communication system.;
Optical arc sub communication system can carry out all-optical relay.;
Optical soliton communication is superior to intensity modulation / direct detection and coherent optical communication in high fidelity and long-distance transmission.】

5、判断题：
‎In the optical soliton amplification technology, all-optical soliton amplifier can directly amplify the optical signal, avoiding the optical / electrical and electrical / optical conversion modes in the traditional optical communication system.‌
选项：
A: 正确
B: 错误
答案: 【 正确】

6、判断题：
‌The loss of optical soliton is inevitable in the propagation of optical fiber.​
选项：
A: 正确
B: 错误