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What is OTDR in optical fiber?

An Optical Time Domain Reflectometer (OTDR) is an important instrument used by organizations to certify the performance of new fiber optics links and detect problems with existing fiber links.

How accurate is an OTDR?

For example, a singlemode OTDR with a dynamic range of 35 dB has a usable dynamic range of approximately 30 dB. Assuming typical fiber attenuation of 0.20 dB/km at 1550 nm and splices every 2 km (loss of 0.1 dB per splice), a unit such as this one will be able to accurately certify distances of up to 120 km.

What is OTDR and its function?

An optical time domain reflectometer (OTDR) is a device used to precisely detect faults in an optical fiber link of a communication network. Its function includes generation and transmission of a series of high-speed optical pluses within the fiber.

What is slope in OTDR?

The OTDR plots a slope based on the backscatter information it measures. This measurement determines the attenuation level (power/distance) for the fiber. The difference between the slope that precedes an event and the slope that follows it provides the data necessary for the OTDR’s loss estimate (see Fig. 1).

What is the working principle of OTDR?

The predictable nature of Rayleigh scattering has been leveraged as a fundamental working principle in OTDR technology. The volume of source light energy backscattered to the detector provides a reliable indication of attenuation and signal (or optical) loss in the optical fiber link.

How many OTDR are there?

four types
There are four types of OTDR, they are Full-feature OTDR, Hand-held OTDR, Fiber Break Locator, and RTU in RFTSs. Full Feature OTDR Full-feature OTDRs are traditional. They are feature-rich and usually larger, heavier, and less portable than either the hand-held OTDR or the fiber break locator.

What does OTDR calculate?

The OTDR measures the amount of light that’s returned from both backscatter in the fiber and reflected from a connector or splice.

How do you analyze OTDR results?

How can you measure splice or connector loss? First place one of the markers or cursors (usually called 1 or A on your OTDR) just before the reflectance peak. Next, place the second marker (referred to as 2 or B on your OTDR) just after the reflectance peak. The OTDR will calculate the loss between the two markers.

What is the principle of OTDR?

How does OTDR work?

The laser emits a pulse of light at a specific wavelength, this pulse of light travels along the fiber being tested, as the pulse moves down the fiber portions of the transmitted light are reflected/refracted or scattered back down the fiber to the photo detector in the OTDR.

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What can an OTDR fiber tester do for You?

We pride ourselves in offering a wide range of OTDR’s that range from basic to more advanced. They can include additional functionalities like visual fault locators, fiber microscopes and more to allow the OTDR to be a multifunctional fiber tester for field use by fiber network professionals.

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