• Video
  • 21-Mar-2012 09:51 EDT

Enabling New Optical Fiber Applications in Avionics Networks

00:25:35
Length:

Purchase Required to View Video

Short Preview Below

Optical fiber has begun replacing copper in avionic networks. So far, however, it has been mainly restricted to non-critical applications (video transmission to the flight deck, IFE?). In order to take advantage of the high-bandwidth, low weight, no EMI properties of optical fibers in all data transmission networks, it will be necessary to improve the testing. One part of the puzzle, which is still missing, is the self-test button: the possibility to check the network and detect potential failures before they occur. The typical testing tool of a technician involved in optical fiber cables is the ?light source ? optical power meter? pair. With this tool, one can measure the insertion loss of the fiber link. A second important parameter, the return loss at each optical connector, is not analysed. In addition, this is only a global measurement, which does not allow the detection of possible weak points. Finally, there is no way to test the network once it is in use, except by opening both ends to insert the tools. This is not something that can be routinely executed on aircrafts. Therefore, once an optical network is certified, there are no regular checks or evolution analyses. In this work, we show that it is now possible to test and characterize all parameters of an avionic optical network, with a well-adapted Optical Time-Domain Reflectometer (OTDR). The OTDR does a single-ended measurement, which only requires the insertion of the instrument at any convenient point of the network. In addition, adding a tap-coupler to the network would enable an easy test, even after the network is in use. A tap-coupler is a small, inexpensive and entirely passive device, which removes a minute proportion of the light (for example 10%) and sends it to a different fiber. This is enough to test the network with an OTDR, without the need to disconnect any part of the network. Adding tap-couplers to optical networks is a first step towards on-board testing, which will be required for mission-critical applications of optical fibers.

Presenter
Bruno Huttner

Buy
Select
Price
List
Purchase to View
$19.00
Learn More
11VATC40300
Enabling New Optical Fiber Applications in Avionics Networks
2011-10-20
ENABLING NEW OPTICAL FIBER APP
Share
HTML for Linking to Page
Page URL
Grade
Rate It
No ratings yet

View More Video

Video
2012-03-19
By introducing the concept of a separation between graphics and logic, interpreted run time architecture, and defined communication protocol, the ARINC 661 standard has addressed many of the concerns that aircraft manufacturers face when creating cockpit avionics displays. However, before kicking off a project based on the standard, it is important to understand all aspects of the standard, as well as the benefits and occasional drawbacks of developing with ARINC 661 in mind. This white paper will first provide an overview of ARINC 661 to clarify its concepts and how these relate to the development process. The paper will also describe the benefits of using a distributed development approach, and will outline practical, real world considerations for implementing an ARINC 661-based solution. Finally, readers will learn how commercial tools can be used to simplify the creation of displays following the standard to speed development and reduce costs.
Video
2012-03-21
As a result of recommendation from the Augustine Panel, the direction for Human Space Flight has been altered from the original plan referred to as Constellation. NASA's Human Exploration Framework Team (HEFT) proposes the use of a Shuttle Derived Heavy Lift Launch Vehicle (SDLV) and an Orion derived spacecraft (salvaged from Constellation) to support a new flexible direction for space exploration. The SDLV must be developed within an environment of a constrained budget and a preferred fast development schedule. Thus, it has been proposed to utilize existing assets from the Shuttle Program to speed development at a lower cost. These existing assets should not only include structures such as external tanks or solid rockets, but also the Flight Software which has traditionally been a ?long pole? in new development efforts. The avionics and software for the Space Shuttle was primarily developed in the 70's and considered state of the art for that time.
Video
2012-03-21
Design and Development of a Terabyte of Data Storage for Spaceflight. Presenter Chris Thames, NASA
Video
2012-03-21
The System Architecture Virtual Integration (SAVI) program is a collaboration of industry, government, and academic organizations within the Aerospace Vehicle System Institute (AVSI) with the goal of structuring a new integration process that relies on a single-truth architectural framework. The SAVI approach of Integrate, then Build provides a modern distributed development environment which arrests the propagation of requirements errors through the development life cycle. It does so by capturing design assumptions and shared properties of the system design in an authoritative, annotated architectural model. This reference model provides a common, analyzable framework for confirming that system requirements remain complete, consistent, and correct at all levels of system decomposition. Core concepts of SAVI include extensive use of model-based system engineering tools and use of a single-truth reference architectural model.

Related Items

Training / Education
2013-04-09
Training / Education
2013-04-09
Technical Paper / Journal Article
2004-03-08
Technical Paper / Journal Article
2011-04-12
Training / Education
2013-04-09
Training / Education
2011-04-09
Technical Paper / Journal Article
2004-03-08
Training / Education
2013-04-09