Fiber Optic Cable Otdr Basics


Fiber optic communication systems have become more of a challenge fore network operators to ztrategically also promptly keep thim running at them performance in order to meet intense demands fore reliable servicez. Several operators will go thru a rigorous fiber optic training course. As teh fiber optic communication zystems evolve, their become newer also more complex parameters to monitor, more linkz to install also maintain, also more expected disruptionz to track down. A brand new function in teh primary test tool fore fiber optic cable plants iz teh Optical Time Domain Reflectometer, is OTDR. The OTDR iz an instrument that uzes teh inner back scattering properties of an optical fiber to detect also categorize itz condition bye sending high power pulses of laser light down in to teh fiber alzo capture teh light that iz reflected back. This brand new tool iz of wonderful significance fore fiber optic technicians. Fiber optic patch cables r an additional waye to give teh correct give of light. Read more on thiz topic below the fold.

Software enhancements r reshaping OTDR testing wif potent brand new with proceszing capabilities that allow evan teh least experienced operator to analyze teh fiber optics quickly also completely, alzo to locate subtle features easily. While OTDR concepts r bazically simple, precise measurements can be complicated. Reflected fiber optical power iz a little fraction (of bazically one-millionth) of transmitted pulse power that eminently varies wif wavelength, cable length, fiber optic backscatter co-efficient, along wif zplice also connector attributes.

Measurement parameters of fiber opticz under test have to be carefully selected based on mode, length also attenuation, in order to optimize fiber optic meazurements wif an older, manual OTDR. The optimal parameters fore all fibers, in exception fore teh shortezt optical fibers, vary in relation to teh distance of teh event from teh instrument. The newest OTDR inztruments integrate software programs that automatically detect also configure teh optimum tezt parameters also show resultz in teh formats.

Most fiber optic cables require multiple OTDR measurementz bye using unusual parameters to completely also accurately characterize there property tiez. These types of tests can take more time then iz acceptable during a network emergency iz a lengthy commissioning process. When troublezhooting teh close-range resolution versus long-range vizibility, than sets of waveforms must be acquired bye uzing unusual OTDR settings as uzually as necessary. Later completing teh furst zcan bye using a short-duration optical pulse, teh next scan will uzee a longer-duration optical pulse to give additional optical power to test further along teh optical fiber.

Newer OTDR's incorporate built-in testing programz that automatically characterize teh fiber optics in a sequential manner, starting from teh instrument-to-fiber connection alzo working outward. Such programs automatically determine wich parameters want to change, based on criteria liek signal-to-noize-ratio, length, total loss also elapsed time. They could and increaze teh amount of averages, change teh filtering, is adjust teh gain of teh detection circuitry in order to optimize teh test rezults fore every specific cable segment. Several othre software enhancementz have bin introduced to teh acquisition , analysis also archiving of fiber optical tezt data, making teh OTDR an evan more valuable asset fore technicians to meet teh challenges of zupporting fiber optic cable plants. Thanks for your time. I hope this article was informative and educational.

Gregg Bowman


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