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单选题
In optical transmission systems， chirped lasers are used for the purpose of：（）.
A
Turning the laser to a specific ITU channel
B
Keeping the signal wavelength locked to a specific technology
C
Suppressing FWM and SBS non-linear effects
D
None ofthe above
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更多 “单选题In optical transmission systems， chirped lasers are used for the purpose of：（）.A Turning the laser to a specific ITU channelB Keeping the signal wavelength locked to a specific technologyC Suppressing FWM and SBS non-linear effectsD None ofthe above” 相关考题
考题
Telecommunications stand for devices and systems that transmit electronic or optical signals across long distances. Telecommunications enables people around the world to contact one another, to access information instantly, and to communicate from remote areas. Telecommunications usually involves a sender of information and one or more recipients linked by a technology, such as a telephone system, that transmits information from one place to another. Telecommunications enables people to sand and receive personal messages across town, between countries, and to and from outer space. It also provides the key medium for delivering news, data, information, and entertainment.Telecommunications devices convert different types of information, such as sound and video, into electronic or optical signals. Electronic signals typically travel along a medium such as copper wire or are carried over the air as radio waves. Optical signals typically travel along a medium such as strands of glass fibers. When a signal reaches its destination, the device on the receiving end converts the signal back into an understandable message, such as sound over a telephone, moving images on a television, or words and pictures on a computer screen.Telecommunications messages can be sent in a variety of ways and by a wide range of devices. The messages can be seat from one sender to a single receiver (point-to-point) or from one sender to many receivers (point-to-multipoint). Personal communications, such as a telephone conversation between two people or a facsimile (fax) message (see Facsimile Transmission), usually involve point-to-point transmission. Point-to-multipoint telecommunications, often called broadcasts, provide the basis for commercial radio and television programming.Telecommunications begin with messages that are converted into electronic or optical signals. Some signals, such as those that carry voice or music, are created in an analog or wave format, but may be converted into a digital or mathematical format for faster and more efficient transmission. The signals are then sent over a medium to a receiver, where they are decoded back into a form. that the person receiving the message can understand. There are a variety of ways to create and decode signals, and many different ways to transmit signals.Individual people, businesses, and governments use many different types of telecommunications systems. Some systems, such as the telephone system, use a network of cables, wires, and switching stations for point-to-point communication. Other systems, such as radio and television, broadcast radio signals over the air that can be received by anyone who has a device to receive them. Some systems make use of several types of media to complete a transmission. For example, a telephone call may travel by means of copper wire, fiber-optic cable, and radio waves as the call is sent from sender to receiver. All telecommunications systems are constantly evolving as telecommunications technology improves. Many recent improvements, for example, offer high-speed broadband connections that are needed to send multimedia information over the Internet.Personal computers have pushed the limits of the telephone system as more and more complex computer messages are being sent over telephone lines, and at rapidly increasing speeds. This need for speed has encouraged the development of digital transmission technology. The growing use of personal computers for telecommunications has increased the need for innovations in fiber-optic technology.Telecommunications and information technologies are merging and converging. This means that many of the devices now associated with only one function may evolve into more versatile equipment. This convergence is already happening in various fields. Some telephones and pagers are able to store not only phone numbers but also names and personal information aboA．Current development.B．Transmission of message.C．Computer networking.D．Government regulation.
考题
调度请求用于请求新传输的『____』资源。(Scheduling request is used to request 『____』resource for new transmission.)
考题
More recently, lasers have been used to () skin discolorations.
A.takeB.removeC.recoverD.move
考题
The transmission media used t0 build a LAN is(73).A．twisted pairB．microwaveC．optieal fiberD．satellitic signal
考题
isn't a type of transmission medium used for LANs.A．Twisted pairB．Coaxial cableC．SatelliteD．Optical fiber
考题
（ ）operating systems are used for handheld devices such as smart-phones.A.MobileB.DesktopC.NetworkD.Timesharing
考题
For lasers with tightly controlled wavelengths, approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system?()
A. 0.4 nanometersB. 0.6 nanometersC. 0.8 nanometersD. 1.2 nanometersE. 1.6 nanometers
考题
Which three technologies are used to reduce chromatic dispersion accumulation in fiber－optic transmission systems? ()(Choose three.)
A. PIN photodiodesB. zero-chirped lasersC. Erbium-doped fiber amplifiersD. dispersion compensating fiberE. dispersion compensating Bragg grating
考题
______ is not usually used in liquid cargo systems．A.Hydraulic drive systemsB.Electric drive systemsC.Steam drive systemsD.Man-powered drive systems
考题
共用题干
New Research Lights the Way to Super-fast Computers1. New research published today in the journal Nature Coniniunications,has demonstrated how glass can be manipulated to create a material that will allow computers to transfer information using light. This development could significantly increase computer processing speeds and power in the future.2. The research by the University of Surrey,in collaboration with the University of Cambridge and the University of Southampton,has found it is possible to change the electronic properties of amorphous chalcogenides,a glass material integral to data technologies such as CDs and DVDs. By using a technique called ion doping,the team of researchers have discovered a material that could use light to bring together different computing functions into one component,leading to all-optical systems.3. Computers currently use electrons to transfer information and process applications.On the other hand,data sources such as the Internet rely on optical systems:the transfer of information using light. Optical fibres are used to send information around the world at the speed of light,but these signals then have to be converted to electrical signal once they reach a computer,causing a significant slowdown in processing.4 .“The challenge is to find a single material that can effectively use and control light to carry information around a computer. Much like how the web uses light to deliver information,we want to use light to both deliver and process computer data,”said project leader,Dr. Richard Curry of the University of Surrey.5 .“This has eluded researchers for decades,but now we have shown how a widely used glass Call be manipulated to conduct negative electrons,as well as positive charges,creating what are known as‘pn-junction'devices. This should enable the material to act as a light source,a light guide and a light detecto—something that can carry and interpret optical information.In doing so,this could transform the computers of tomorrow,allowing them to effectively process infonna- tion at much faster speeds.”6. The researchers expect that the results of this research will be integrated into computers within ten years .In the short term,the glass is already being developed and used in next-generation computer memory technology known as CRAM,which may ultimately be integrated with the advances reported. The result of the research can help computers to increase_________.A: optical informationB: processing speedsC: electronsD:positive chargesE: data technologiesF: all-optical systems
考题
共用题干
New Research Lights the Way to Super-fast Computers1. New research published today in the journal Nature Coniniunications,has demonstrated how glass can be manipulated to create a material that will allow computers to transfer information using light. This development could significantly increase computer processing speeds and power in the future.2. The research by the University of Surrey,in collaboration with the University of Cambridge and the University of Southampton,has found it is possible to change the electronic properties of amorphous chalcogenides,a glass material integral to data technologies such as CDs and DVDs. By using a technique called ion doping,the team of researchers have discovered a material that could use light to bring together different computing functions into one component,leading to all-optical systems.3. Computers currently use electrons to transfer information and process applications.On the other hand,data sources such as the Internet rely on optical systems:the transfer of information using light. Optical fibres are used to send information around the world at the speed of light,but these signals then have to be converted to electrical signal once they reach a computer,causing a significant slowdown in processing.4 .“The challenge is to find a single material that can effectively use and control light to carry information around a computer. Much like how the web uses light to deliver information,we want to use light to both deliver and process computer data,”said project leader,Dr. Richard Curry of the University of Surrey.5 .“This has eluded researchers for decades,but now we have shown how a widely used glass Call be manipulated to conduct negative electrons,as well as positive charges,creating what are known as‘pn-junction'devices. This should enable the material to act as a light source,a light guide and a light detecto—something that can carry and interpret optical information.In doing so,this could transform the computers of tomorrow,allowing them to effectively process infonna- tion at much faster speeds.”6. The researchers expect that the results of this research will be integrated into computers within ten years .In the short term,the glass is already being developed and used in next-generation computer memory technology known as CRAM,which may ultimately be integrated with the advances reported. Glass is used in the research to carry and process__________.A: optical informationB: processing speedsC: electronsD:positive chargesE: data technologiesF: all-optical systems
考题
Which three technologies are used to reduce chromatic dispersion accumulation in fiber-optic transmission systems？（）A、 PIN photodiodesB、 zero-chirped lasersC、 Erbium-doped fiber amplifiersD、 dispersion compensating fiberE、 dispersion compensating Bragg grating
考题
Which two statements are true about the protocols that are used for transmitting voice traffic？（）A、RTP multiplexing is used to keep multiple phone conversations separateB、RTP provides end-to-end delivery services for voice trafficC、UDP is used to ensure a reliable transmission from sender to receiverD、RTP is used to provide resource reservation for the voice streamE、UDP provides multiplexing
考题
For lasers with tightly controlled wavelengths, approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system?（）A、0.4 nanometersB、0.6 nanometersC、0.8 nanometersD、1.2 nanometersE、1.6 nanometers
考题
Which three technologies are used to reduce chromatic dispersion accumulation in fiber-optic transmission systems? （）(Choose three.)A、PIN photodiodesB、zero-chirped lasersC、Erbium-doped fiber amplifiersD、dispersion compensating fiberE、dispersion compensating Bragg grating
考题
When deployed to transmission application of wavelengths up to 160 wavelengths, the ZXWM M900 performs optical amplification of signals at the C band and the L band independently at the same time.
考题
Language can be used to refer to contexts removed from the immediate situations of the speaker. This feature is called （）A、displacementB、dualityC、flexibilityD、cultural transmission
考题
In optical transmission systems， chirped lasers are used for the purpose of：（）.A、Turning the laser to a specific ITU channelB、Keeping the signal wavelength "locked" to a specific technologyC、Suppressing FWM and SBS non-linear effectsD、None ofthe above
考题
Which device is used in wireless networks to send transmissions to a target area?（）A、Optical fiberB、Access pointC、Omni-directional antennaD、Directional antenna
考题
500 systems are being deployed to remote locations. What tool on the remote systems can be used to automate the download and installation of fixes at the remote site?（）A、dshB、sumaC、sudoD、smitty
考题
单选题Which of the following can be used in hydraulic transmission system?（）A
Hydraulic oilB
Animal oilC
Light oilD
Fuel oil
考题
单选题（） is not usually used in liquid cargo systems.A
Hydraulic drive systemsB
Electric drive systemsC
Steam drive systemsD
Man-powered drive systems
考题
单选题For lasers with tightly controlled wavelengths, approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system?（）A
0.4 nanometersB
0.6 nanometersC
0.8 nanometersD
1.2 nanometersE
1.6 nanometers
考题
多选题Which three technologies are used to reduce chromatic dispersion accumulation in fiber-optic transmission systems? （）(Choose three.)APIN photodiodesBzero-chirped lasersCErbium-doped fiber amplifiersDdispersion compensating fiberEdispersion compensating Bragg grating
考题
单选题For lasers with tightly controlled wavelengths， approximately how far apart are the centers of adjacent wavelengths when 100 GHz spacing is used in a DWDM system？ （）A
0.4 nanometersB
0.6 nanometersC
0.8 nanometersD
1.2 nanometersE
1.6 nanometers
考题
单选题A major advantage of the NAVTEX system when compared to other systems is that（）.A
the information can be received on an ordinary FM radioB
warnings are printed out for reading when convenientC
broadcasts are at scheduled timesD
a low frequency band is used for long distance transmission
考题
多选题Which three technologies are used to reduce chromatic dispersion accumulation in fiber-optic transmission systems？（）APIN photodiodesBzero-chirped lasersCErbium-doped fiber amplifiersDdispersion compensating fiberEdispersion compensating Bragg grating
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