光纤通信RF方面的中英文翻译

1、精选优质文档-倾情为你奉上精选优质文档-倾情为你奉上专心-专注-专业专心-专注-专业精选优质文档-倾情为你奉上专心-专注-专业RF和微波光纤设计指引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和微波光纤设

19、计指引大概二十年以前，Agere系统公司通过其前辈开始发展和生产激光和检测器线性光纤的联系。这些电子元件组成部分连续不断地为了进入各种各样要求高保真，高频率，或者长途模拟和数字的信号的运输的系统。由于这广泛传播的使用和发展，八十年代末，这些系列产品通常被认为是标准的RF和微波组成部分不同的应用。光纤的许多引人注意的优势使它被越来越广泛的应用。光纤设备的最主要的好处是其损失低。由于光的减弱的小于0.4 dB每公里，光纤传送的信号几乎可以传输数十公里并且仍然保持原来的输入的质量。对于最实际的系统低的纤维损失也是独立的频率。用激光和检测器加速到18 GHz，联系能以他们原来的形式发送高频信号，无须改

20、变或者为了一个系统的传输部分使他们数字化。因此，信号转化设备便可以闲置或者干脆不用，这样便可以节省一部分费用。机械的灵活性节省了费用，同时，轻量级光纤电缆，大约只有1/25波导的重量的1/10coax。考虑到高的信号速率没有昂贵的建筑投资方面的支持。许多传播线能通过小的导管支持。光缆的布局更进一步被光纤的自然免疫性简化到电磁的干扰( EMI )。 不仅数目大的纤维能用电源电缆严紧地捆扎，他们也提供了一个独一的安全和电气隔离的传输路径。纤维光学设备的巨大的优势首先使得他们在长的拖曳数字电讯中的广泛传播中被使用。按光纤通信的最基本的形式，从一种半导体激光器发射的光或者发光二极管发射的光通过一种纤维发送数字编码的信息到一个光电二极管。通过比较，在线性的纤维光学系统中发展朗讯，光通过纤维发送的强度直接与输入的电流有关。然而这就对激光和光电二极管的质量有额外的要求，它在许多传送专断RF和微波信号应用中很重要。因此，目前有成千上万的Agere系统的传输器在被使用。信息在这里提供检查基本的联系组