2021 Optical Fiber Communications Engineering(南京信息职业技术学院)1463728459 最新满分章节测试答案

本答案对应课程为:点我自动跳转查看
本课程起止时间为:2021-03-15到2021-07-17
本篇答案更新状态:已完结

Task 1 Cognition of Optical Fiber Communication System Test 1

1、 问题:The production material of optical fiber is (      )
选项：
A:Copper
B:Iron
C:Compound
D:Quartz
答案: 【Quartz】

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

Task 2 Designing an Ideal Optical Transmission Model Test 2

1、 问题:Which of the following is a dispersion-shifted single-mode fiber?
选项：
A:G.652
B:G.653
C:G.654
D:G.655
答案: 【G.653】

2、 问题:Threshold current of laser should be (     )
选项：
A:The larger the better
B:The smaller the better
C:Both OK
D:No impact
答案: 【The smaller the better】

3、 问题:The following (    ) is part of the optical receiver
选项：
A:ATC
B:AGC
C:APC
D:ARC
答案: 【AGC】

4、 问题:Which is not the advantage of EDFA?
选项：
A:High coupling efficiency
B:High gain and low noise
C:The gain characteristic is sensitive.
D:High energy conversion efficiency
答案: 【The gain characteristic is sensitive.】

5、 问题:The laser is a new type of light source because of its concentrated emission direction, high brightness, superior coherence and good monochromaticity.
选项：
A:正确
B:错误
答案: 【正确】

Task 3 Cognition of SDH transmission network Test 3

1、 问题:For STM-16 signals, RSOH monitors the transmission performance of 
选项：
A:STM-N frame 
B:STM-1 
C: STM-4
D:STM-16
E:STM-64
答案: 【STM-N frame 】

2、 问题:The optical interface of the digital synchronous transmission system adopts the () code type
选项：
A:scrambled NRZ code
B:NRZ code
C: scrambling code
D:HDB3 code
E:CMI code
答案: 【scrambled NRZ code】

3、 问题:In the PDH system, which of the following rates uses synchronous multiplexing
选项：
A:64kbit/s
B: 2048kbit/s
C:34Mbit/s
D: 140Mbit/s
答案: 【64kbit/s】

4、 问题:A VC-4 slot contains ( ) VC-3 slot, and each VC-3 can hold (  ) 34m signals. 
选项：
A: 1,3 
B: 1,1 
C: 3,1 
D: 3,3
E: 2,3
答案: 【 3,1 】

5、 问题: () is used to identify the starting position of the frame
选项：
A: A1、A2
B:B1、B2 
C: D1、D2 
D: E1、E2 
E:F1、S1
答案: 【 A1、A2】

6、 问题:In the STM-1 frame structure, the net load area is located in
选项：
A:10~270 column, 1~ 9 row 
B:10 ~270 column, 1~3 row.
C: 1 ~ 3 column, row 4 
D:1 ~ 9 column, row 4 
E: 1 ~ 9 column, 5 ~ 9 row
答案: 【10~270 column, 1~ 9 row 】

7、 问题:The PDH branch signal of 8Mbit/s can be multiplexed into STM-N signal
选项：
A:正确
B:错误
答案: 【错误】

8、 问题:Whether it is STM-1, STM-4 or STM-16, the frame rate is 8000 frames per second
选项：
A:正确
B:错误
答案: 【正确】

9、 问题:The 5-8 bits of S1 bytes represent different clock quality levels of ITU-T. The higher the value of S1, the higher the clock quality level.
选项：
A:正确
B:错误
答案: 【错误】

10、 问题:SDH can not achieve "one step" low-speed signal add-drop and multiplexing
选项：
A:正确
B:错误
答案: 【错误】

11、 问题:The rate of STM-16 is about 2.5Gb/s
选项：
A:正确
B:错误
答案: 【正确】

12、 问题:The band efficiency of SDH system is relatively high
选项：
A:正确
B:错误
答案: 【错误】

13、 问题:DCC bytes can complete the function of data communication path.
选项：
A:正确
B:错误
答案: 【正确】

Task 4 SDH transmission equipment networking Test 4

1、 问题:The OIB1D optical plate in ZXMP S320 equipment has () light directions