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AN649

更新时间: 2022-11-29 07:30:47
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美信 - MAXIM 光纤
页数 文件大小 规格书
11页 233K
描述
HFTA-04.0: Optical/Electrical Conversion in SDH/SONET Fiber Optic Systems

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FIBER OPTIC CIRCUITS  
Application Note 649: Jun 28, 2000  
HFTA-04.0: Optical/Electrical Conversion in SDH/SONET Fiber Optic Systems  
This article explains the basic functions and design challenges of the optical to  
electrical and electrical to optical signal conversion in SDH/SONET fiber optic  
receivers and transmitters. A complete chip set solution to develop the electronic part  
of OC 12/STM 4 receivers and transmitters is presented.  
The advent of cheaper and more powerful personal computers has not only expanded the user  
base; it is also creating a demand for greater transmission capacity among the telecom  
networks by adding an increasing volume of internet and videophone connections to the  
traditional phone and fax services. The following discussion of an OC 12/STM 4  
receiver/transmitter chipset supports these developments and includes a description of the  
electronic components required for optic/electric (O/E) conversion in SDH/SONET fiber optic  
transmission systems.  
Competition among network providers enables the multimedia market to grow, and the  
introduction of new and improved products and services in the near future should strengthen  
the demand for increased transmission capacity. This need for more data throughput can be  
satisfied economically with fiber optic (FO) cables because the transmission capacity is  
potentially very high (versus that of copper wires). The physical nature of the fiber cable lets  
providers expand capacity by increasing the transmission bit rate or by introducing alternative  
transmission techniques, without the need for further upgrades or additional cable installations.  
These advantages have led many countries to build extensive fiber networks, and further  
expansion of these networks can be expected.  
To transmit optical data via fiber cables, signals must be converted from electrical to optical at  
the transmit end, and then converted back to electrical at the receive end. These necessary  
conversions are handled by receiver/transmitter units that contain electronic devices along with  
the optical components.  
FO transceivers  
The widely used Time Division Multiplex (TDM) transmission technique now enables bit rates  
up to 10Gbps and is well established in modern transport systems. Today's high-speed fiber  
optic transmission systems offer the following standard bit rates:  
www.maxim-ic.com/an649  
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