SAE AIR 6113-2010 Guidelines for Design of Digital Fiber Optic Link Loss Budget Methodology《数字光纤链环损失预算方法体系设计导则》.pdf
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1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2010 SAE International All rights reserved. No part of this publication m
3、ay be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside U
4、SA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AIR6113 AEROSPACE INFORMATION REPORT AIR6113 Issued 2010-12 Superseding AS5603 Guidelines for
5、 Design of Digital Fiber Optic Link Loss Budget Methodology RATIONALE This document was originally published as AS5603, “Digital Fiber Optic Link Loss Budget Methodology for Aerospace Platforms”. A revised standard, AS5603A, will be released in the future, providing the specification details for a f
6、iber optic link budget in a form that is more suitable for use as an industry standard. This new document, AIR6113, is intended to archive the information that existed in the original AS5603 document. INTRODUCTION This SAE document provides specific process and procedure based on broadly accepted en
7、gineering practices for the establishment of link loss power budgets in aerospace digital fiber optic systems. The underlying purpose is to improve the process of aerospace digital fiber optic link architecture, specification, and interface developments by promoting a standard terminology and method
8、ology across the industry. A communication facilitation tool such as this streamlines the development of system requirements, establishes high-level confidence in predicted performance, and communicates to component suppliers the quality and quantity of test data needed to support high performance f
9、iber optic links. 1. SCOPE This document draws from, summarizes, and explains existing broadly accepted engineering best practices. This document defines the process and procedure for application of various best practice methods. This document is specifically intended as a standard for the engineeri
10、ng practice of development and execution of a link loss power budget for a general aerospace system related digital fiber optic link. It is not intended to specify the values associated with specific categories or implementations of digital fiber optic links. This document is intended to address bot
11、h existing digital fiber optic link technology and accommodate new and emerging technologies. The proper application of various calculation methods is provided to determine link loss power budget(s), that depend on differing requirements on aerospace programs. A list of parameters is provided as gui
12、dance for aerospace fiber optics applications along with a check list to help assure that appropriate parameters and impairments have been accounted for in the link budget. SAE AIR6113 Page 2 of 99 1.1 Approach The general approach of this document is to outline existing industry best practices for
13、link budget analysis, including specific reference to MIL-STD-2052A Ref. 22. Additionally, reference is made to existing component and link test procedures, test data, and best practices commonly used to support the link loss power budget. Where industry best practices are not well established, appr
14、opriate alternative methods are described. 1.2 Data Basis and Methodology Link loss power budgets are ultimately tied to component test and qualification data. The quality, quantity and pedigree of component test and qualification results that exist can impact the approach and methodology used for d
15、evelopment of a link loss power budget. Accuracy of statistical methods depends on the quality of the statistical data available. Furthermore, technology maturity of a component can affect the methodology used. As such, various link loss budget methodologies are discussed with reference to the quali
16、ty of data available. Additionally, the Technology Readiness Level (TRL) Refs. 2,3 of components is discussed along with the influence it can have on link budget analysis. A range of possible cases of component maturity and corresponding data exists. For example, flight qualified components may exis
17、t, without a large statistical database to help quantify probability and confidence. Similarly, high quality and quantity statistical data may exist for some components, but these components may not have been through system flight-testing. Often, commercial components exist with minimum specificatio
18、ns and thus are neither flight qualified nor have a statistical database to draw on for analysis. These different cases suggest different approaches or at least different confidence and possibly margin associated with the link budget analysis. Various analysis methods exist for establishing and anal
19、yzing link budgets (discussed in Section 4). As mentioned previously, the quality of the link budget analysis, and the resulting allocations, are dependent on the quality of the component loss and performance test data that are utilized. This translates directly to the confidence in predicted system
20、 performance. While different approaches provide differing levels of accuracy, they also may drive the component testing that is performed. In some cases, system developments must take on the burden of additional component testing to generate the quality of test data needed and to avoid even more co
21、stly over-design margin. 1.3 Link Loss Power Budget Background and Overview The Power Budgeting is a part of the Systems Engineering Process. It is not an isolated analysis. It must be a consistent part of the overall systems engineering approach. This standard provides the different analyses as a t
22、ool for the customers and the link designers to evaluate the fiber technologies in meeting the fiber optics systems application intent/purpose. The Figure 1 diagram provides a visual relationship of systems engineering process and power budgeting. The key emphasis is that an understanding of the rel
23、ationships between the different considerations and their effects on each other and on the power budget is critical. These tools provide a means to either evaluate the current fiber link performance in certain environmental conditions (operational conditions, maintenance concept, etc.) or could be u
24、sed to set performance requirements based on critical fiber link application needs. They serve as metrics to better understand how the link design will perform for the life of the system from beginning of life, installation, and end of life. Link loss power budgets generally begin with the light sou
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