The viavi solutions reference guide to fiber optic testing vol. Otdr testing of fiber optic cable plants otdr testing creates a snapshot of a fiber optic cable. File type pdf reference guide to fiber optic testing reference guide to fiber optic testing foa reference guide to fiber optics study guide to foa certification for read and download book visit link in the video. To complete the lessons, you should use the links to. Viavi solutions reference guide to fiber optic testing, volume 1. A complete testing strategy download pdf fiber is playing as increasing role in most network installations, driven by the need for higherbandwidth applications in data centers and backbone cabling system, as well as emerging lowlatency 5g and fttx deployments in service provider networks. Basics of otdr optical timedomain reflectometer testing. An otdr is an instrument able to measure the optical power backscattered along a fibre as a function of distance. An optical time domain reflectometer otdr for short is an electronicoptical instrument that is used to characterize optical fibers. During the process of otdr testing, the equipment injects a higher power laser or fiber optic light source pulse into a fiber from one end of the fiber cable. The increasing proportion of network installation jobs involving fiber makes it critical for contractors to understand the technologies for fiber testing and develop an appropriate test strategy. Fiber testing and otdr basics brett isley terriitory sales manager october 28, 2015. Making otdr measurements the fiber optic association. Optical fiber has a lifetime greater than 25 years compared with 10 years for satellite communications systems.
Using an optical time domain reflectometer otdr 67. Otdr measurements during cable manufacture and cable testing almost always use a shorter pulse width as compared to corning fiber production otdr measurements. An allinone fttx test solution for rapid installation and maintenance of fiber networks. Our experienced team of project managers, sales representatives and product developers are standing by to help you with your next fiber optic or networking project. This is an foa video showing how an otdr is used for testing optical fiber. An otdr trace is a graphical signature of a fiber s attenuation along its length which provides insight into the performance of the link components cable, connectors and splices and the quality of. Otdr fiber visualizer fiber visualizer is a new fault location function designed to simplify the entire testing process. The otdr basics poster provides a fundamental collection of technical information about otdrs and fiber testing. Cfo 301 standard for installing and testing fiber optics management, security or fire alarm systems, or any other communications link. Field test procedure for optical fiber link measurements sterlite. The laser light is transmitted by multimode fiber only in the center of the core figure 9 because its emission angle is so low. Field test procedure for optical fiber link measurements. The ideal construction otdr for everyday field testing in any access network. I have been personally involved in several instances where misapplication of otdr testing.
Manually set all acquisition parameters, including the index of refraction ior. For example, a single fiber cable can consist of 144 fibers. Advanced otdr software incorporates a feature to supply loss measurement reports and a realtime graph. A spike in the left end of the fiber trace with a rounded or flattened peak see figure 4 will mark the connection to the leadin fiber at the otdr and the start of the trace. Extended or tier 2 fiber certification supplements tier 1 testing with the addition of an optical time domain reflectometer otdr from end to end. The color tft lcd display provides a powerful yet simple set of fiber parameters and control indications to view an entire fiber link or zoom in and analyze a splicing point or defect in the fiber. Reliable and accessible fiber links are the very foundation of a sound optical network. Guidance for otdr assessment of fusion spliced singlemode. Standard for installing and testing fiber optic cables. The most important test for most fibers is an accurate measurement of the.
With the rapid advancements in fiber optic technology, otdr testing has become an indispensable method to build, certify, maintain and troubleshoot fiber optic systems. The optical events include splice loss, connector loss, fiber attenuation, and faults. Results from natural reflection of the fiber the otdr uses backscatter to measure fiber attenuation dbkm. Discount online store 4 fiber optic equipments 85,665 views. The purpose of otdr is to detect, locate, and measure optical events at any position in the fiber optic link. Otdr stands for optical time domain reflectometer which is an instrument used to create a virtual picture of a fiber optic cable route. Otdr testing quick reference guide keys afl fiber optic. Explanation of reflection features in optical fiber as. Connect the leadinfiber to the otdr output port to observe the fiber measurement trace and fdf port to which the fiberundertest is connected. Innovation is front and center at exfo, and the intelligent optical link mapper iolm is a prime example of a gamechanging solution. By sending a pulse of light the optical in otdr into a fiber and measuring the travel time time domain and strength of its reflections reflectometer from points inside the fiber, it produces a characteristic trace, or profile, of the length vs. Maintenance and troubleshooting of a pon network with an.
Choosing between optical loss and optical time domain. The light source and otdr must operate within the range of 1010 nm and 155020 nm single mode nominal wavelength for testing in accordance with telecommunications industry association tia tia5267 measurement of optical power loss of installed singlemode fiber cable plant. Smartloop otdr enables automated testing and analysis of two fibers in a. Necafoa 301 standard for installing and testing fiber optic cables 2 figure 2. In many of my previous articles on fiber optic testing, i have mentioned optical timedomain reflectometers otdrs. Optical loss test set olts tester comprised of fiber optic power meter and test source used to test the loss of components or cable plants. Use same type of fiber and connector as futtesting 50125 mm fiber with 62,5125 mm reference cables gives virtually no losstesting 62,5125 mm fiber with 50125 mm reference cables gives 2 4 db losstesting sm fiber with mm reference cables gives 1520 db loss four ways to do the job sources of measurement uncertainty. Connect the leadin fiber to the otdr output port to observe the fiber measurement trace and fdf port to which the fiber undertest is connected. Improper use, however, can be misleading and, in my experience, can contribute to expensive mistakes for the contractor. Connect the otdr to one end of a launch cable may also be called a dead band cable. Outside plant osp fiber optic cable installations are typically pointtopoint links with terminations inside buildings and intermediate connections in sealed closures. An optical timedomain reflectometer otdr is an optoelectronic instrument used to characterize an optical fiber. Reference guide to fiber optic testing second edition volume 1 by j. Mt9083abc otdr fiber visualizer demonstration the access master mt9083 to provide an easytouse and reliable hand held unit designed for the field.
This test is commonly used to verify the quality of the installation and troubleshoot problems. Necafoa301 standard for installing and testing fiber optic cables. The otdr plots these fiber optic field testing guidelines excerpt from optical cable corporations installation guide page 3 of 6 occ2069 controlled document rev. Wolszczak contact the authors jdsu 34 rue necker 42000 saintetienne france tel. Best practices for testing fiber optics in the enterprise bicsi. An otdr trace is a graphical signature of a fibers attenuation along its length which provides insight into the performance of the link components cable, connectors and splices and the quality of. Designed for offline analysis, fastreporter2 offers reliable data and report management in. Reference guide to fiber optic testing lasertec, center for. It locates defects and faults, and determines the amount of signal loss at any point in an optical fiber. It injects a series of optical pulses into the fiber under test and extracts, from the same end of the fiber, light that is scattered rayleigh.
Launch cables are necessary for most otdr units because the otdr is effectively blind for some distance from the light launch point. Guidance for otdr assessment of fusion spliced single. Guidance for otdr assessment of fusion spliced singlemode fibers. It shows the difference in traces according to how one sets up the otdr test parameters. The inservice otdr was designed specifically for testing live fiber networks. Exfo otdr 2 user guide download pdf for free and without registration get exfo otdr 2 owners manual.
It is also referred to as lspm for light source and power meter. Optical loss the amount of optical power lost as light is transmitted through fiber, splices, couplers, etc. Battery for this instrument is rechargeable nimh battery. This dedicated device uses an outof band wavelength test wavelength far away from traffic wavelength to enable otdr testing without disturbing either the network transmitters or the receivers.
By providing pictorial trace signatures of the fibers under test, its possible to get a graphical representation of the entire fiber optic link. Acceptance testing of fiber optic cable using an otdr continued page 4 of 4 20, the light brigade, inc. May 24, 20 otdr working principle, we need to start from the process of otdr testing. Fiber type this parameter is used to set fiber type which determines the gir and backscatter coefficient. An otdr is the optical equivalent of an electronic time domain reflectometer. And then it receives the return information at the otdr port. The otdr sends pulses of four or more wavelengths into one end of the fiber. Tier 2 extended tests are an optional addition to tier 1. Get all exfo manuals exfos otdr modules meet all your testing needs with numerous singlemode. Optical time domain reflectometer the optical time domain reflectometer otdr is used to visually represent an optical fibers attenuation characteristics along its length. The otdr has problems with multimode fiber, since it uses a laser source to get the high power necessary to cause high enough backscatter levels to measure. Maintenance and troubleshooting of a pon network with an otdr.
Assessment of fiber attenuation and splice loss using an otdr international standards iec 60793140 and the telecommunications industry association tia optical fiber test procedure tiafotp61 indicate that splice and attenuation measurements with an otdr must be conducted from both. Designed for offline analysis, fastreporter2 offers reliable data and report management in a userfriendly environment. Make sure that the optical fiber or cable is not in use and there is no laser beam in the fiber before testing via otdr. The tberd 4000 is a highly integrated platform that features two module slots, a large 7inch color screen with a touchscreen option, a highcapacity lithiumion battery, an optional video inspection scope through universal serial bus usb port, and optional builtin optical test. Optical time domain reflectometer otdr is a widely used instrument in fiber optic testing.
The optional full license fastreporter2 is the perfect complement to your otdr ii, and can be used to combine multiple test results of the otdr ii and fiber probe into detailed pdf documentation. Backscattering the scattering of light in a fiber back toward the source,used to. Otherwise, it may result in imprecise test trace, even permanent damage for the otdr battery. Otdr optical time domain reflectometer fluke networks. The otdr only needs to have access to one end of a fiber to make its measurements. Attenuation the opticalloss of fiber per unit coefficient length,expressed in dbkm. Use the data storage features of the otdr to save the trace using a unique file name. Ghost events in optical time domain reflectometer otdr. Otdr optical timedomain reflectometer is such a powerful test instruments for fiber optic cable testing. Therefore, fiber optic cables can contain a large number of fibers in a much smaller area. Otdrs are valuable fiber optic testers when used properly. Network master pro ethernetcpriotdr test equipment.
Lanscape solutions recommended fiber optic test guidelines. In premises applications, fiber optic cables can be used as the backbone cabling in a standard structured cabling network, connecting network hardware in the computer roommain cross connect. With its simple taptive user interface and powerful feature set, the optifiber pro turns anyone into an efficient and expert premise fiber troubleshooter or installer. So in order to assess the integrity of the infrastructure, we need accurate and faster methodologies and testing devices. Launch cable launch cord a test cable used to connect the otdr to the near end of the link under test that is long enough to allow the otdr to measure the loss of the first connection. An outside plant installer will have an otdr on hand to test every splice made as its done, so. Jul 18, 2016 how to use the exfo ftb1720 otdr to test the fiber optic cable duration. The otdr will display the distance from the otdr connector to the end of the fiber as well as the total loss of the span in db or the loss per kilometer. To complete the lessons, you should use the links to the lesson plans and complete these exercises. A spike in the left end of the fiber trace with a rounded or flattened peak see figure 4 will mark the connection to. Sep 14, 2012 this is an foa video showing how an otdr is used for testing optical fiber.
The relative arrival time is then measured for each backscattered wavelength signal. How to use the exfo ftb1720 otdr to test the fiber optic cable duration. With an iolm application for both singlemode and multimode testing, its the most automated and intelligent troubleshooting tool for ftta, lan and data centers. Otdr testing requires interpretation of the data acquired, called the trace or signature, by a skilled operator. Optical time domain reflectometer otdr tier 2 extended tests are an optional addition to tier 1 basic tests fiber endface inspection and certification is also a requirement to ensure pristine endface condition prior to mating. Fluke networks fiber test and troubleshooting instruments. If unused for a long time, battery should be recharged before being used. The iolm lets you take advantage of the full power of your otdr, bringing automation to a new leveland enabling even the untrained technician to become a test expert in no time. Live fiber otdr inservice testing of pon requires out of band wavelength. This course draws on two other fiber u courses, fiber optic testing and the fiber optic basic skills lab. Contractors, network owners and fiber system designers need to understand the difference between olts and otdr testing and the benefits both provide. Acceptance testing of fiber optic cable using an otdr by.
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