Ehu olqn wkdw wkh 276 630 fdqqrw yhq wkrxjk wkh 275 lv d srzhu ful tool is does not replace the need for tier 1 testing, because otdr testing results can vary as a result of user setup. Figure 2 measurement for a bidirectional otdr test, step 1. Fiber optic system test procedures data systems performance engineering llc performs three tests in order to determine fiber optic cable adequacy. Introduction to otdr testing the optical timedomain re. 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. Otdr with launch and tail fibers test leads that overcome otdr dead zone limitations to measure the loss and reflectance of the first and last connector in the link tier 2 fiber certification procedure bidirectional otdr testing is required to calculate the correct event. This document includes basic testing procedures for verifying horizontal optical fiber. Two levels of testing are defined in these updated standards. It shows the difference in traces according to how one sets up the otdr test parameters. A technician performs an acceptance test using an otdr and. I have been personally involved in several instances where misapplication of otdr testing. Wolszczak contact the authors jdsu 34 rue necker 42000 saintetienne france tel.
Tier 2 fiber certification procedure bidirectional otdr testing is required to calculate the correct event loss values of the linkundertest and due to directivity that results from differences in diameter, backscatter, numerical aperture and index of refraction of the link and launch and tail fibers. The access master mt9083a2 features a 7inch widescreen tftlcd display for use both indoors and outdoors, enhanced battery operation time up to 12 hours increased operating temperature range 10 to 50c and shortcut function keys. Otdr testing an optical timedomain reflectometer or otdr is a sophisticated test instrument used to probe the characteristics of long optical fibers. Installing and testing fiber optics the fiber optic association. Users manual for otdr iii safety terms used in this manual the warning sign denotes a hazard. Always avoid looking directly at unconnected end of optic fiber in testing and. Standards and recommendations of fiber optic systems.
The following example helps demonstrate how an extended test regime can help to ensure consistent quality during installation. The pulse width at 850 nm was short enough at least to see both ends of the cable, so we know that no receive cable was used in the testing. They work by injecting a very brief pulse of light into one end of a long optical fiber, then monitoring any light received at that same end of the fiber. To fully understand the meaning of an otdr measurement, users must. This corning paper explains measurement behaviors of fusion spliced optical fibers and how glass properties and mfd mode field diameter differences across fiber splice junctions can lead to erroneous interpretations of splice loss when performing unidirectional otdr optical time. Innovation is front and center at exfo, and the intelligent optical link mapper iolm is a prime example of a gamechanging solution. Oct 08, 2014 in this video, you will learn how to set up the fis firecat otdr for tracing and testing your fiber, along with tips and tricks for helpful use. 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. Figure 3 measurement for a bidirectional otdr test, step 2.
Optical timedomain reflectometer otdr is an optoelectronic instrument used to characterize an optical fiber. Sep 14, 2012 this is an foa video showing how an otdr is used for testing optical fiber. According to iec 6128041, multimode testing in order to properly measure the first and last connection for bidirectional averaging, the launch and tail cords must remain in their initial measurement positions. This document is not intended to be training material for optical testing. This is an foa video showing how an otdr is used for testing optical fiber. This procedure is one component of a complete testing and commissioning program. It defines a minimum level of quality for fiber optic cable installations. Lanscape solutions recommended fiber optic test guidelines. And if youve just completed a fibre installation of your own, otdr testing will allow you to certify that your new cabling meets the. If otdr has been set in average test mode, otdr will perform average test over the link circuit of the optical fibre to be tested based on the preset conditions. Acceptance testing of fiber optic cable using an otdr by. Manual measurement offers two ways to measure event loss. Field test procedure for optical fiber link measurements keywords otdr, olts, slsopm, attenuation issued april 2014 abstract after.
It calls attention to a procedure, practice, or the like, which, if not correctly performed or. Titled understanding otdrs, the course include a free otdr simulator that students can download for practice use. Otdr testing of fiber optic cable plants otdr testing creates a snapshot of a fiber optic cable. Cfo 301 standard for installing and testing fiber optics management, security or fire alarm systems, or any other communications link.
This method of measurement removes the attenuation between two. Testing high speed fiber links rodney casteel, rcdd, dcdc, nts, osp commscope, chair tia fotc tyler vander ploeg, rcdd viavi solutions jamie humphreys exfo rob gilberti afl. Pol testing summary pol networks are very similar to ftth in terms of testing proper testing tools and mops help deploying pol networks with a trouble free 25year warranty documenting physical layer tests before activating the service gives a birth certificate of the link. Otdrs are valuable fiber optic testers when used properly. 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.
Free online course covers otdr use cabling installation. Connecting the otdr with leadin fiber to the fdf and new fiber link. With projx management system, optifiber pro allows a project manager to define each users role, settings and the associated tasks to be performed transforming the otdr into an allin. Reference guide to fiber optic testing lasertec, center for. In order to ensure proper light propagation and errorfree. Think of the otdr pulse as being a virtual source that is testing all the. This corning paper explains measurement behaviors of fusion spliced optical fibers and how glass properties and mfd mode field diameter differences across fiber splice junctions can lead to erroneous interpretations of splice loss when performing unidirectional otdr optical time domain reflectometer tests. If otdr has been set in realtime test mode, the system will continuously refresh and test till you click. An important aspect in maximizing an otdrs value is to properly plan its daytoday usage. Use the data storage features of the otdr to save the trace using a unique file name.
In that conversation, it was revealed that there were about 30 cables with a total of 1,000 fibers involved in the. In many of my previous articles on fiber optic testing, i have mentioned optical timedomain reflectometers otdrs. Tm national electrical installation standards t h e f i b er o p t i c a soci a t i o n foa standard for installing and testing fiber optic cables necafoa 3012004. It is important that all physical connection points are free of dust. Jdsu pulse delay otdr method in the tberd mts6000 platform. Otdr testing requires interpretation of the data acquired, called the trace or signature, by a skilled operator. Select multi mode or single mode if otdr is a quad wavelength unit press to enter the menu mode.
Making otdr measurements the fiber optic association. Field test procedure for optical fiber link measurements sterlite. I have been personally involved in several instances where misapplication of otdr testing has cost. Utilizing sophisticated algorithms, the equipment is able to calculate exact length and approximate loss of events along the cable span. Using isopropanol and a lint free wiper, clean the optical connectors at both. An otdr requires much more technical expertise and training to use, and testing is generally much slower. Extended or tier 2 testing involves the use of an otdr and an olts. Defects can be attributed to the cable manufacturing process, shipping, the cable. When to use an otdr or lts kingfisher international. 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. The second method uses a pigtail with a reusable mechanical splice, which allows easy mating of the. Optical timedomain reflectometer tutorial fs community. At any point in time, the light the otdr sees is the light scattered from the pulse passing through a region of the fibre.
Dec 27, 2012 otdr testinggn netttest cma4000 otdrotdr optical time domain reflectometer technology is designed to provide a single ended test of any cable. Field test procedure for optical fiber link measurements. The otdr test process is dependent on the equipment type and the fiber optic cable run being tested, as well as the objectives of the test. The postconstruction testing procedure will be optimized with respect to time and cost using the test procedures described in this testing note. So the labour expense of using an otdr may be considerably higher. However, there are some common otdr testing procedures that are fundamental to any application. Experts in fiber testing anritsus range includes the unique coherent otdr for testing submarine cables up to 12,000 km and the new uotdr, with performance that rivals traditional otdrs that are four times the size and more than double the price. Reference guide to fiber optic testing second edition volume 1 by j. Expert labour to operate an otdr may not be available in the required timescale, when a simpler loss test set can be operated faster and with lower skill levels. But some end users and contractors persist in using otdrs to test short premises. An otdr is the optical equivalent of an electronic time domain reflectometer. Innovation is front and center at exfo, and the iolm is a prime example of a gamechanging solution.
Do not proceed beyond a warning sign until the indicated conditions are fully understood and met. Testing fiber optic cables the osi reference model physical data link network transport session presentation application ethernet physical layer optical fiber, twisted pair, coaxial cable, sonetsdh, modem, rs232, etc ip, arp, ipx, x. Its a bit of a mouthful, but it saves a whole lot of time when youre on a faultfinding survey of your fibre plant. Otdr injects a series of optical pulses into the fiber under test.
Instructions of otdr test modes and parameters ftth. Receive cable tail cord a test cable used to terminate the far end of the link under test that is long enough for the otdr to measure the loss of the last connection. Normally, for commissioning a new cable link, otdr testing is carried out in both directions on. With projx management system, optifiber pro allows a project manager to define each users role, settings and the associated tasks to be performed transforming the otdr into an allinone fiber testing tool complete with. Otdr testing creates a snapshot of a fiber optic cable.
Ready to test in less than 15 seconds and all day without recharging. Range length of optic fiber relevant to the trace pulse width width of laser pulse sending out from otdr to optic fiber average time to select suitable testing time. Lanscape solutions recommended fiber optic test guidelines lan1561aen page 3 guidelines wudfh fdq surylgh d ylvxdo slfwxuh ri wkh. Trouleshooting otdr testing technical bulletin cleaning procedure cleaning the launch cable or test cable connector this can be done using premoistened alcohol wipes, using dry lint free cleaning wipes and 99% pure isopropyl alcohol, or using a dry connector cleaning tool like an all in one click type. It can be considered as the optical equivalent of an electronic timedomain reflectometer. 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.
This test is commonly used to verify the quality of the installation and troubleshoot problems. The otdr basics poster provides a fundamental collection of technical information about otdrs and fiber testing. Tools and equipment needed should be in good condition and must be checked by supervisor prior to usage in the construction area. The order in which the tests are to be performed is not particularly critical. Guidance for otdr assessment of fusion spliced singlemode fibers. Otdr testinggn netttest cma4000 otdrotdr optical time domain reflectometer technology is designed to provide a single ended test of any cable. Improper use, however, can be misleading and, in my experience, can contribute to expensive mistakes for the contractor.
Utilizing sophisticated algorithms, the equipment is able to calculate exact length and approximate loss. Acceptance testing of fiber optic cable using an otdr continued page 4 of 4 20, the light brigade, inc. Test methods for installed singlemode optical fibre cable links. Fiber testing and otdr basics brett isley terriitory sales manager october 28, 2015. Guidance for otdr assessment of fusion spliced single. It sends out a very high power pulse and measures the light coming back. In this video, you will learn how to set up the fis firecat otdr for tracing and testing your fiber, along with tips and tricks for helpful use.
Oct 28, 2015 if otdr has been set in realtime test mode, the system will continuously refresh and test till you click. That caused another call, a conference call also involving the contractor, where we discussed the relevant testing standard and procedures for loss testing. Standard for installing and testing fiber optic cables. Thus the otdr test was only useful for measuring the loss of the first connector and perhaps finding faults in the fiber of this short cable. Baldwin summary optical cable must be tested throughout the procurement and installation process to ensure that nrao receives a fiber transmission system without defects or added cost. Fully automated bidirectional otdr data acquisition and data analysis test instruments from the beginning, jdsu has understood the need for developing a test instrument that reduces both the test ing time and the processing time of a large quantity of test results, maximizing quality assurance. It calls attention to an operating procedure, or the like, which, if not correctly performed or. Standards and recommendations for fiber optic systems.
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