中国大学Optical Fiber Communications Engineering_1课后答案(mooc完整答案)
97 min read中国大学Optical Fiber Communications Engineering_1课后答案(mooc完整答案)
What is 中国整答an Optical Fiber Communication System?随堂测验
1、"Optical fiber communication" refers to ( )
A、大学A communication mode in which radio waves are used as carriers and optical fibers are used as transmission media.
B、后答A communication mode in which optical waves are used as carriers and optical fibers are used as transmission media.
C、案m案A communication mode in which optical waves are used as carriers and cables are used as transmission media.
D、中国整答A communication mode in which laser is 大学used as carriers and optical fibers are used as transmission media.
2、The后答 three wavelengths used in optical fiber communication are ( )
A、λ=0.85um，案m案λ=1.20um，中国整答λ=1.80um
B、大学λ=0.80um，后答λ=1.51um，案m案λ=1.80um
C、中国整答λ=0.85um，大学λ=1.31um，后答λ=1.55um
D、λ=0.85um，λ=1.20um，λ=1.80um
3、The function of the photodetector is ( )
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
4、The spectrum of optical fiber communication belongs to ( )
A、Visible light
B、Ultraviolet light
C、Infrared light
D、X-ray
5、The production material of optical fiber is ( )
A、Copper
B、Iron
C、Compound
D、Quartz
6、The disadvantage of optical fiber communication is high transmission loss.
7、Optical fiber can be connected directly without special tools.
8、The function of photodiodes is to convert optical signals into electrical signals.
9、The first laser was a ruby laser.
10、The laser commonly used in communication is semiconductor laser.
Coursework 1
1、Please refer to the data to list the optical communication technologies commonly used at present, and compare their characteristics.
Task 2 Designing an Ideal Optical Transmission Model
2.1 Structure and Classification of Optical Fiber随堂测验
1、Which of the following is a dispersion-shifted single-mode fiber?
A、G.652
B、G.653
C、G.654
D、G.655
2、The structural form of an electromagnetic field that can exist independently is called ( )
A、Field
B、Mode
C、Model
D、Structure
3、According to the laying mode, optical cable can be divided into the following categories
A、Directly buried optical cable
B、Pipeline optical cable
C、Aerial optical cable
D、Underwater optical cable
4、According to the cable core structure, optical cable can be divided into the following categories
A、Layer stranded type
B、Skeleton type
C、Central bundle type
D、Leather thread type
5、According to the refractive index, there are mainly ______ and _______types of optical fibers.
6、According to the transmission mode, there are mainly ______ and _______types of optical fibers.
2.2 Principle of Optical Transmitter随堂测验
1、LED is usually coupled with multimode fiber and is used in small-capacity, short-distance optical communication systems at ( ) wavelengths.
A、1.31μm
B、0.85μm
C、1.55μm
D、1.49μm
2、The physical basis of active devices (light sources and detectors) is the effect of the interaction between light and matter. It can be summed up as the interaction between light and atom, and ( )kinds of physical processes will take place.
A、stimulated absorption
B、spontaneous emission
C、stimulated radiation
D、nuclear radiation
3、The light source is the key device of the optical transmitter, and its function is to convert the electrical signal into the optical signal.
4、The laser is a new type of light source because of its concentrated emission direction, high brightness, superior coherence and good monochromaticity.
5、The light source devices are generally LED and LD.
6、Stimulated radiation is the key to the generation of laser. The reversal distribution state of particle number is the first condition for matter to produce light to enlarge and emit light.
2.3 Principle of Optical Receiver随堂测验
1、Threshold current of laser should be ( )
A、The larger the better
B、The smaller the better
C、Both OK
D、No impact
2、The following ( ) is part of the optical receiver
A、ATC
B、AGC
C、APC
D、ARC
3、The key device in the optical receiver is the semiconductor optical detector, which and the preamplifier in the receiver are called the front end of the optical receiver. The performance of the front end is the main factor that determines the optical receiver.
4、Intensity modulation-direct detection (IM-DD) of optical receiver mainly includes photoelectric detector, preamplifier, main amplifier, equalizer, clock recovery circuit, adjudicator and automatic gain control (AGC) circuit.
5、The amplifier of the optical receiver includes two parts: the preamplifier and the main amplifier. The requirements for the preamplifier are lower noise, wider bandwidth and higher gain. The main amplifier is generally a multi-stage amplifier.
6、The photodetector is a PN junction with a forward bias voltage.
2.4 Optical Wavelength Division Multiplexer and Optical Amplifier随堂测验
1、Which is not the advantage of EDFA?
A、High coupling efficiency
B、High gain and low noise
C、The gain characteristic is sensitive.
D、High energy conversion efficiency
2、Which kind of amplifier is amplified by the nonlinear effect in optical fiber?
A、EDFA
B、Raman fiber amplifier
C、PDFA
D、Semiconductor amplifier
3、Which are the characteristic parameters of optical wavelength division multiplexer?
A、Insertion loss
B、Wavelength isolation
C、Gain
D、Echo loss
4、Optical amplifiers can extend the transmission distance better than photoelectric repeaters.
5、DWDM uses C and L band.
Coursework 2
1、Please draw the basic structure composition of the optical transmitter. Please draw the basic structure composition of the optical receiver.
Task 3 Cognition of SDH transmission network
Task 3 assignment
1、Briefly describe the advantages and disadvantages of SDH.
Task 4 SDH transmission equipment networking
Task 4 assignment
1、This paper briefly describes the function of NCP board of ZXMP S320
Task 5 SDH Network Management Configuration
Task 5 Unit Test
1、( ) interface is used to communicate between NCP and MCU of all boards of this network element.
A、ECC
B、F
C、S
D、Qx
2、In the two-fiber two-way MSP of SDH, one optical fiber is used in each transmission direction, and the（ ）capacity is allocated to the service channel on each optical fiber.
A、A half
B、One-third
C、One-fourth
D、One-fifth
3、In ZXONM E300 network management software, （ ）runs on NCP board.
A、Manager
B、GUI
C、Database
D、Agent
4、The ZXMP S320 device provides a synchronization scheme based on SSM information. The main function of this scheme is（ ）.
A、Select the effective timing source with the highest synchronization quality
B、Prevent the clock from forming a loop
C、Guarantee the timing synchronization performance of the network
D、All of the above are correct.
5、The maximum number of network elements in the two-fiber bi-directional multiplexing segment protection ring is （ ）.
A、8
B、16
C、32
D、64
6、STM-1 can hold （ ） 34M signals.
A、1
B、2
C、3
D、4
7、STM-1 can hold （ ） 2M signals.
A、61
B、62
C、63
D、64
8、STM-1 can hold （ ） 140M signals.
A、1
B、2
C、3
D、4
9、Communication between network elements uses（ ）interface for communication.
A、ECC
B、F
C、S
D、Qx
10、The interface between the network elements and the network management system is（ ）.
A、ECC
B、F
C、S
D、Qx
11、The type of network elements used in SDH ring network is（ ）.
A、REG
B、ADM
C、DXC
D、TM
12、Among the following options,( ) is not the source of the SDH clock
A、External clock source
B、Internal clock source
C、The clock extracted from optical links
D、The clock extracted from network management system
13、Among the following options,( ) is not the call form for a OW phone.
A、Broadcast
B、Point-to-point call
C、Group call
D、Barge in
14、The power board can be installed in the ( ) slot.
A、14、15
B、1、2
C、3、4
D、5、6
15、If a STM-4 interface is required, a ( ) board should be installed.
A、OIB1S
B、ET3E
C、O4CSD
D、NCP
16、The cross board can be installed in the ( ) slot.
A、1、2
B、6、7
C、8、9
D、14、15
17、NCP board can be installed in the ( ) slot.
A、4
B、3
C、2
D、1
18、OW board can be installed in the ( ) slot.
A、15
B、14
C、13
D、12
19、SCB board can be installed in the ( ) slot.
A、14、15
B、2、3
C、4、5
D、6、7
20、If a STM-1 interface is needed, ( ) board should be installed.
A、OIB1S and OIB1D
B、ET3E
C、O4CSD
D、NCP
21、( ) board can provide 2M interface.
A、SCB
B、ET3E
C、ET1
D、CSBE
22、( ) board can provide 34M interface.
A、SCB
B、ET3E
C、ET1
D、CSBE
23、In S1 bytes, the number indicating that the clock is not available is ( ).
A、0010
B、1101
C、1110
D、1111
24、The purpose of setting up OW control points in a ring topology is ( ).
A、Prevent broadcast storms
B、Prevent OW service from forming a ring
C、Prevent OW phone calls from being blocked
D、Prevent the clock from forming a loop
25、With regard to the principle of selecting OW control points, what is incorrect is ( ).
A、It can be configured in a chain network.
B、It can be only configured in a ring network.
C、Select the node with the least optical direction.
D、Prevent broadcast storms.
26、If there are multiple paths to extract the clock, you should choose ( ).
A、The longest path
B、The shortest path
C、Give priority to the internal clock
D、Give priority to the external clock
27、In China, ( ) is used in digital synchronization network.
A、Two-level master-slave synchronization mode.
B、All clock levels are equal.
C、Three-level master-slave synchronization mode.
D、Four-level master-slave synchronization mode.
28、The impact of SDH on synchronous networks does not include ( ).
A、Pointer adjustment will cause a large phase jump at the boundary of the SDH/PDH network.
B、Allow mixed transmission of different specifications of net load, which is disadvantageous to network synchronization planning.
C、The automatic configuration functions of self-healing ring, routing backup and DXC not only provide flexibility and high survivability, but also bring complexity to the selection of network synchronization timing.
D、The accuracy of synchronization network is improved.
29、In S320 equipment, if two STM-4 optical interfaces are needed, ( ) veneer should be installed.
A、ET3E
B、ET1
C、OIB1D
D、O4CSD
30、SDH network management products can be divided into four layers, in the following options，( ) does not belong to these four layers.
A、Board management layer.
B、Network elements layer
C、Network elements management layer
D、Network management layer
Task 5 Unit Exercises
1、Please download and check "task 5 exercises.pdf". According to this pdf document, complete SDH configuration operations and upload screenshots.
Task 6 Configuration For SDH Protection
Task 6 Unit Exercises
1、Please download and check "task 6 exercises.pdf". According to this pdf document, complete MSP configuration operations and upload screenshots.
Task 7 DWDM Networking Foundation
Test7
1、The working window commonly used in WDM technology is
A、850nm
B、1310nm
C、1550nm
D、1800nm
2、The wavelength interval of 40-wave DWDM system is
A、0.4nm
B、0.8nm
C、20nm
D、30nm
3、G.694.1 is the standard for
A、SDH
B、CWDM
C、DWDM
D、MSTP
4、The network element that realizes the functions of optical transmission, multiplexing and demultiplexing is
A、OTM
B、OLA
C、OADM
D、OXC
5、The optical transmission unit is configured in the network element
A、OTM
B、OLA
C、OADM
D、OXC
6、Which factor does not affect the transmission distance of DWDM?
A、attenuation
B、dispersion
C、nonlinear effect
D、electromagnetic interference
7、In the reference configuration of the DWDM system specified in the G.692 protocol, MPI-S refers to
A、channel sender point
B、main path interface sender
C、main path interface receiver
D、channel receiver point
8、The electric relay function is realized by OTM which can realize the rebirth of optical signal.
9、In order to reduce the attenuation, the optical signal through OSC channel needs to be amplified.
10、Similar to EDFA, Raman amplifiers can only work in C and L bands.
Courework7
1、Please explain how the three multiplexing technologies of TDM, WDM and SDM are applied in the optical fiber communication system.
Task 8 OTN Networking Foundation
Test8
1、The electrical layer of OTN does not include
A、OPU
B、ODU
C、OTU
D、OCH
2、The FEC overhead is generated at the
A、OPU
B、ODU
C、OTU
D、OCH
3、The optical link between network elements of OTN is called
A、OTS
B、OMS
C、OCH
D、OXC
4、The first field of the OTN frame is
A、FAS
B、SM
C、PM
D、TDM
5、The OTN frame size is
A、9x270xN
B、4x4080
C、1024
D、53
6、The framing of OTN data is completed in
A、OTU
B、OM
C、OLA
D、OD
7、When the client signal of the OTN system is adapted, it firstly enter
A、OPU
B、ODU
C、OTU
D、OCH
8、Compared with DWDM network, OTN improves the speed of optical transmission.
9、The frame size of OTN is variable
10、Compared with DWDM, OTN system focuses on enhancing the function of OAM.
Coursework8
1、Please explain the role of each overhead in the OTN frame
Task 9 OTN Network Management Configuration
9.2 OTN Optical Power Debugging随堂测验
1、The OTN optical interface specification protocol defined by ITU-T is ( )
A、G.957
B、G.691
C、G.692
D、G.709
2、The meaning of the number in 'SEOBA 2520' is: ________
A、The gain is 20dB and the maximum output optical power is 25dBm.
B、The gain is 25dB and the maximum output optical power is 20dBm.
C、The gain is 20dB and the stable output optical power is 25dBm.
D、The gain is 25dB and the stable output optical power is 20dBm.
3、When measuring the optical power, we should first ensure that the input optical power difference of each channel of the OMU is within _____.
A、1dB
B、2dB
C、3dB
D、5dB
4、The main characteristic of OBA is that the noise figure is low and there is no great requirement for output power.
5、According to the type of position, the amplifier board can be divided into_______, _________ and ________.
9.4 Realization of OTN Protection Function随堂测验
1、About SOP board, which of the following is wrong?
A、Sop board uses relative non-light decision mode by default.
B、Default switching trigger condition : |Pp-Pw| > 5dB
C、Default switching recovery condition : |Pp-Pw| > 2dB
D、SOP can be used in OCH, OMS and OTS layer
2、Which boards have APR/APSD function?
A、OMU
B、ODU
C、SEOBA
D、SEOPA
Coursework 9
1、A 40-wave OTN system is shown in the figure, and now 5 waves are activated. Where does the system need to add the optical attenuators, and how about their values? (log2=0.3, log5=0.7)
Task 10 Understanding the development of optical transmission system
Coursework 10
1、Please analyze the most key technologies involved in the development of optical communication technology and discuss your views according to your study and reference materials
Task 11 New Cognitive Transmission Technology
Test 11
1、What is the wavelength of ultra long wavelength infrared optical communication？
A、2~5 in microns
B、5~10 in microns
C、10~15 in microns
D、15~20 in microns
2、What technologies are involved in the new optical communication technologies？
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
3、Which two technologies are used in coherent optical communication technology？
A、Envelope detection technology
B、Heterodyne detection technology
C、Coherent modulation technology
D、OFDM technology
4、Compared with linear optical fiber communication, optical soliton communication has a series of significant advantages, including:
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.
5、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.
6、The loss of optical soliton is inevitable in the propagation of optical fiber.
7、The so-called coherent modulation is to use the signal to be transmitted to change the frequency, phase and amplitude of the optical carrier, which requires that the optical signal has a certain frequency and phase, that is, it should be coherent light.
8、All information carried by amplitude, frequency, phase and polarization state of light can be detected in ordinary optical communication.
中国大学Optical Fiber Communications Engineering_1
随着科技的不断进步，通信技术也在不断地发展，其中光纤通信技术成为了当今通信技术的主流之一。光纤通信技术具有数据传输速度快、信号衰减小、抗干扰性强等优点，已经广泛应用于各个领域中。而在这个领域中，中国大学的“Optical Fiber Communications Engineering”专业就凭借其优良的师资力量、丰富的实践经验和前沿的研究成果，成为了国内光纤通信领域的重要培养基地。
1. 专业设置
中国大学Optical Fiber Communications Engineering专业是一个集光学、电子、通信等学科于一体的交叉学科专业，旨在培养具备光纤通信系统设计、集成、优化能力以及对光电子器件和光学器件有深刻理解的高级工程技术人才。
专业课程设置主要包括光纤通信原理、光纤通信系统设计、光纤通信器件、光纤传感技术、光纤通信网络等。此外，还涵盖了相关的电子技术、通信技术、计算机技术、光学技术、材料技术等领域的基础课程。
2. 师资力量
中国大学Optical Fiber Communications Engineering专业的师资力量强大，拥有一批优秀的教授、专家和工程技术人才。其中，不乏国内外知名专家学者，如麻省理工学院的Qing Liu教授、欧洲光学学会会士Ning Liu教授、加拿大光学学会会士Jianping Yao教授等。
除此之外，该专业还拥有一支优秀的教学团队，他们拥有丰富的教学经验和实践经验，能够为学生提供一流的教学环境和学术氛围，使学生能够在这里获得更多的实践经验和知识水平的提升。
3. 实践教学
中国大学Optical Fiber Communications Engineering专业注重实践教学，为学生提供了丰富的实践机会。该专业拥有国内领先的光纤通信实验室和设备，包括光纤通信系统实验平台、光纤通信网络实验平台、光纤传感实验平台等。这些实验平台可以满足学生的各种实践需求，培养学生的实际操作能力和独立思考能力。
此外，该专业还与国内外著名企业建立了合作关系，提供了多种实践机会，如实习、项目合作、研究合作等。这些实践机会可以让学生更好地了解光纤通信技术在实际应用中的应用情况，为将来的就业发展打下坚实的基础。
4. 就业前景
中国大学Optical Fiber Communications Engineering专业的毕业生在国内外都有着广泛的就业机会。他们可以在通信、电子、计算机、光学、材料等领域从事技术研发、产品设计、系统集成等工作，也可以选择走向学术界或者继续深造。
据了解，该专业的毕业生在国内外知名企业和研究机构中都有着广泛的就业机会，如华为、中兴、中国电信、华星光电、欧尚等。他们可以从事光纤通信系统的研发、光电器件的设计和制造、光通信器件的测试和调试等工作。
5. 结语
综上所述，中国大学Optical Fiber Communications Engineering专业是一门非常重要的交叉学科专业，拥有着优良的师资力量、丰富的实践经验和前沿的研究成果。该专业的毕业生在国内外就业前景广阔，为他们的就业和未来发展打下了坚实的基础。
