The programmer sees the lower response time and greater throughput in a properly designed optoelectronics computing system. How about the eventual equipment operator'!
Optoelectronics technology does not show up on the front panel of the equipment. He or she is impacted by the human factors of the interconnect ion. Introduction The potential growth of optoelectronics data communications in the next decade has been fueled by several factors. The first factor is the technology previously developed by the telecommunications industry that has enabled the initial data communications applications.
This factor has been coupled with the needs by the datacom industry for greater throughput in transporting data between computer systems. In addition, datacom customers are demanding increased network connectivity, where large amounts of data must be available instantaneously. Each of these points of view is valid and a successful product will be one that produces a positive image when measured by each of these users.
Telecom and Datacom Environments High performance optoelectronics technology has been developed for loiig distance telecom applications. This is a technology base upon which datacom development must draw. However, a careful examination will show that the datacom operating environment has many differences from the telecom environment that will change the design optimization point when moving from telecom to datacom systems.
These differences may be summarized as follows: These networks are concentrating on the use of optoelectronics, rather than copper wire connections, for a number of reasons that are related to data carrying capacity bandwidth and expense. Optoelectronics provides a communications medium that has superior bandwidth and distance capability compared to copper.
In addition, the increased security of optical cable is a definite plus in some applications. If the connection distance is sufficient, today's initial cost of the optoelectronics communications link is offset by the reduction of system interconnections. Optoelectronics has many positive impacts in the design and use of a computing system, depending on the point of view of the particular user.
Some of these would be: In telecom applications, t h e transmission distance tends to be maximized. This situation results i n the most cost effective use of the fiber cable. I n datacom applications, the distances tend to be considerably shorter and are generally limited to the building or campus dimensions. This shorter distance reduces many of the more stringent requirements on the components.
This may allow cost savings in the performance area that may be traded off for features of greater importance to a datacom user. The distance capability of optoelectronics communications is very attractive to the system designer. Telecom systems typically multiplex many end users over a given optical link.
The datacom user is very sensitive to the cost of the optoelectronics components. They are seldom reconfigured and when this occurs, the work is done by highly trained service and installation personnel.
Datacom systems are subject to frequent reconfiguration in order to meet evolving business needs. These reconfigurations are often performed by the customer, rather than a qualified service organization. The datacom system tends to be connector intensive.
Applications include electric eyes, photovoltaic power supplies, various monitoring and control circuits, and optical fiber communications systems. Both gallium arsenide and silicon have their proponents. Home Network Design Electronics optoelectronics. The book focuses particular attention on practical engineering issues, making it invaluable to those who have worked or studied in the field of optoelectronics for telecommunication and are now moving to optoelectronics for data communication. Key Features Focuses on fundamentals of the field Reviews critical technologies and applications Explains important technology compatibility issues Includes chapters written by specialists in each area with emphasis on engineering issues and practical aspects Presents coverage of topics that are unique to optical data communications.
Fiber Optic Link Performance There is a significant difference in the importance of standards between the telecom and datacom industries. Telecoin links tend to have a common equipment manufacturer between the ends of the link. Where this is not the case, the skill level of the installation personnel allows joint engineering of the link. This situation reduces the requirement for interoperability standards.
On the other hand, a datacom installation will be made up of equipment from many manufacturers. Co nsequen t ly , these standards continue to emerge. What does this data rate allow in terms of throughput? At this data rate, one can transmit: One encyclopedia per second 3.
Real-time high resolution video and data ComDonent Elements There are four key component elements that must come together to make an effective optical-toelectronic conversion. The performance of an optoelectronics communications l i n k is strongly related to the particular choice of physical hardware as illustrated in Figure l. As an example, if distances in excess of I O Km are required at high data rates, then single-mode fiber with a laser source is the only practical choice.
Shorter distances and lower data rates allow the use of lower cost LED sources.
Connectors Before examining the components, we shall review the overall marketplace by application, as shown in Figure 2. The optoelectronics application projections show a steady overall growth through the end of the decade. This is partially offset in the later years by the expansion of fiber into local loop applications. Electronicast A typical data link is shown in Figure 3. In the middle and outer years the applications catch up with the cable installation, with transmitters and receivers forming the majority of the cost. In a similar manner, Figure 5 shows the breakdown of the datacom portion of the worldwide optoelectronics marketplace by component.
The A small data link, such as the FDDI link illustrated in Figure 4, will typically use many short jumper cables rather than higher cost trunk cables. This will result i n a lower cable cost per link for this application resulting in an earlier and greater dominance of the transmitter and receiver costs. Worldwide Datacom Marketplace by Component Source: The high functional content of the modules requires many circuits that generate considerable heat, aggravating the cooling problems within the system.
Therefore, in order to reduce the cost to the customer and thereby increase the acceptance of optoelectronics, the transmitter and receiver costs are clearly the place where effective engineering must take place. Dat aconi l'ec hno lo gy C ha1lenges There are five areas of key technical challenge required to produce effective components. Careful package grounding is required for effective control of both internal and external noise sources. The high sensitivity receivers and critical phase-locked loops inside the module must not be upset when subjected to Electrostatic Discharge levels as high as IS00 volts into the using equipnient.
The equipment designer expects increased function and ease of use for the optoelectronics support circuits. There is a move toward packaging the entire optoelectronics interface in one module. Sensitive areas, such as receiver amplifiers and clock recovery circuits must be protected not only from outside noises but from crosstalk within the IC and module.
The high degree of functionality of these designs will result in their being packaged with the logic in the using machine.
The use of optoelectronics for data communication is becoming increasingly important in the s. Much of the base technology needed for this field was. Publisher Summary. This book is primarily concerned with the optoelectronic technology, which is important for data communication among computers in the.
These areas typically are sources of high package noise. The ICs and module must be designed for good external noise rejection. We'll send you an email containing your password.
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Optoelectronics for Data Communication. Lasky , Ulf L. Osterberg , Daniel P. Focuses on fundamentals of the field Reviews critical technologies and applications Explains important technology compatibility issues Includes chapters written by specialists in each area with emphasis on engineering issues and practical aspects Presents coverage of topics that are unique to optical data communications.