光纖通信RF方面的中英文翻譯

1、精選優(yōu)質(zhì)文檔-傾情為你奉上精選優(yōu)質(zhì)文檔-傾情為你奉上專心-專注-專業(yè)專心-專注-專業(yè)精選優(yōu)質(zhì)文檔-傾情為你奉上專心-專注-專業(yè)RF和微波光纖設(shè)計指引Name:Class:Student NO.:RF and Microwave Fiber-Optic Design GuideAgere Systems Inc., through its predecessors, began developing and producing lasers and detectors for linear fiber-optic links nearly two decades ago. Over time,

2、these optoelectronic components have been continually refined for integration into a variety of systems that require high fidelity, high frequency, or long-distance transportation of analog and digital signals. As a result of this widespread use and development, by the late 1980s, these link product

3、s were routinely being treated as standard RF and microwave components in many different applications.There are several notable advantages of fiber optics that have led to its increasing use. The most immediate benefit of fiber optics is its low loss. With less than 0.4 dB/km of optical attenuation,

4、 fiber-optic links send signals tens of kilometers and still maintain nearly the original quality of the input. The low fiber loss is also independent of frequency for most practical systems. With laser and detector speeds up to 18 GHz, links can send high-frequency signals in their original form wi

5、thout the need to downconvert or digitize them for the transmission portion of a system. As a result, signal conversion equipment can be placed in convenient locations or even eliminated altogether, which often leads to significant cost and maintenance savings. Savings are also realized due to the m

6、echanical flexibility and lightweight fiber-optic cable, approximately 1/25 the weight of waveguide and 1/10 that of coax. Many transmission lines can be fed through small conduits, allowing for high signal rates without investing in expensive architectural supports. The placement of fiber cable is

7、further simplified by the natural immunity of optical fiber to electromagnetic interference (EMI). Not only can large numbers of fibers be tightly bundled with power cables, they also provide a uniquely secure and electrically isolated transmission path. The general advantages of fiber-optics first

8、led to their widespread use in long-haul digital telecommunications. In the most basic form of fiber-optic communications, light from a semiconductor laser or LED is switched on and off to send digitally coded information through a fiber to a photodiode receiver. By comparison, in linear fiber-optic

9、 systems developed by Lucent, the light sent through the fiber has an intensity directly related to the input electrical current. While this places extra requirements on the quality of the lasers and photodiodes, it has been essential in many applications to transmit arbitrary RF and microwave signa

10、ls. As a result, tens of thousands of Agere Systems transmitters are currently in use. The information offered here examines the basic link components, provides an overview of design calculations related to gain, bandwidth, noise, and dynamic range and distortion. A section on fiber-optic components

11、 discusses a number of key parameters, among them wavelength and loss, dispersion, reflections, and polarization and attenuation. Additional information evaluates optical isolators, distributed-feedback lasers and Fabry-Perot lasers, predistortion, and short- vs. long-wavelength transmission. One of

12、 linear optical fiber relation main usages or receives between the electronic installation and the remote localization antenna in the transmission transmits RF and the microwave signal。Because of the optical fiber chain flexibility， possibly can for the simulation or digital signal design some anten

13、nas， including the military and the commercial communications satellite， the global localization satellite， the remote sensing with traces the lighthouse，or wireless cell network 。Another kind of type chain is the optical fiber delay line， installs in a package it including a transmitter， a receiver

14、，with long textile fiber。It may provide the long delay time, high band width, with low weight. These high-frequency RF and the microwave product has obtained benefits from the use linear optical fiber equipment cable television raging tide middle earth. In here, the textile fiber expands the TV sign

15、al the transmitting range, improves their quality and the system reliability, but when merely only has the electric cable, even with the system which used compares has saved the expense In each of these applications, as well as many others, the Agere Systems transmitters and receivers comprising the

16、 links are similar and can be treated as standard microwave components. Focusing on these common elements, this design guide describes the general technical considerations and equations necessary for engineers to choose the most appropriate Agere Systems components for their systems. These equations

17、 also have been incorporated into various programs, which an Agere Systems applications engineer can use to provide an analysis for a specific link application.Figure 1 shows the three primary components in a fiber-optic link: an optical transmitter, a fiber-optic cable, and an optical receiver. In

18、the transmitter, the input signal modulates the light output from a semiconductor laser diode, which is then focussed into a fiber-optic cable. This fiber carries the modulated optical signal to the receiver, which then reconverts the optical signal back to the original electrical RF signal.RF和微波光纖設(shè)

19、計指引大概二十年以前，Agere系統(tǒng)公司通過其前輩開始發(fā)展和生產(chǎn)激光和檢測器線性光纖的聯(lián)系。這些電子元件組成部分連續(xù)不斷地為了進入各種各樣要求高保真，高頻率，或者長途模擬和數(shù)字的信號的運輸?shù)南到y(tǒng)。由于這廣泛傳播的使用和發(fā)展，八十年代末，這些系列產(chǎn)品通常被認為是標準的RF和微波組成部分不同的應(yīng)用。光纖的許多引人注意的優(yōu)勢使它被越來越廣泛的應(yīng)用。光纖設(shè)備的最主要的好處是其損失低。由于光的減弱的小于0.4 dB每公里，光纖傳送的信號幾乎可以傳輸數(shù)十公里并且仍然保持原來的輸入的質(zhì)量。對于最實際的系統(tǒng)低的纖維損失也是獨立的頻率。用激光和檢測器加速到18 GHz，聯(lián)系能以他們原來的形式發(fā)送高頻信號，無須改

20、變或者為了一個系統(tǒng)的傳輸部分使他們數(shù)字化。因此，信號轉(zhuǎn)化設(shè)備便可以閑置或者干脆不用，這樣便可以節(jié)省一部分費用。機械的靈活性節(jié)省了費用，同時，輕量級光纖電纜，大約只有1/25波導的重量的1/10coax?？紤]到高的信號速率沒有昂貴的建筑投資方面的支持。許多傳播線能通過小的導管支持。光纜的布局更進一步被光纖的自然免疫性簡化到電磁的干擾( EMI )。 不僅數(shù)目大的纖維能用電源電纜嚴緊地捆扎，他們也提供了一個獨一的安全和電氣隔離的傳輸路徑。纖維光學設(shè)備的巨大的優(yōu)勢首先使得他們在長的拖曳數(shù)字電訊中的廣泛傳播中被使用。按光纖通信的最基本的形式，從一種半導體激光器發(fā)射的光或者發(fā)光二極管發(fā)射的光通過一種纖維發(fā)送數(shù)字編碼的信息到一個光電二極管。通過比較，在線性的纖維光學系統(tǒng)中發(fā)展朗訊，光通過纖維發(fā)送的強度直接與輸入的電流有關(guān)。然而這就對激光和光電二極管的質(zhì)量有額外的要求，它在許多傳送專斷RF和微波信號應(yīng)用中很重要。因此，目前有成千上萬的Agere系統(tǒng)的傳輸器在被使用。信息在這里提供檢查基本的聯(lián)系組