What is EXFO OTDR?
Optical Time-Domain Reflectometers (OTDR) OTDRs are at the core of EXFO’s optical expertise. Based on field knowledge and 20 years of OTDR expertise, EXFO’s OTDRs are designed to meet network operators’ latest requirements.
What does OTDR calculate?
OTDR device measures the time difference between the outgoing and incoming pulse and the incoming backscatter pulses hence the term “time domain”. The power level of the backscatter signal and the reflected signal are sampled. For a long time. In this way OTDR calculates optical length.
What is a gainer on an OTDR trace?
Akin to water flowing from a small pipe into a large pipe, gainers are essentially perceived increases in optical power that occur at splice points due to variations in fiber characteristics, including core diameter, numerical apertures, mode field diameters and backscatter coefficients.
How often should an EXFO OTDR be calibrated?
one year
Under normal use, the recommended interval for your OTDR is: one year. For newly delivered units, EXFO has determined that the storage of this product for up to six months between calibration and shipment does not affect its performance (EXFO Policy PL-03).
What is reflectance in OTDR?
Reflectance (which has also been called “back reflection” or optical return loss) of a connection is the amount of light that is reflected back up the fiber toward the source by light reflections off the interface of the polished end surface of the mated connectors and air.
How long does OTDR testing take?
It typically takes at least 3 minutes for a skilled OTDR technician with high-quality equipment to obtain one trace. Printing out the trace adds another 2 to 3 minutes per fiber. In a system of only 48 fibers, this adds approximately 5 man-hours, including set-up time, to the testing procedure.
What is the lowest attenuation dB of a 1 km length fiber?
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| Fiber Type | Wavelength | Fiber Attenuation /km (1) |
|---|---|---|
| Multimode 62.5/125um | 850nm | 3.5 dB |
| 1300nm | 1.5 dB | |
| Single Mode 9um | 1310nm | 0.4 dB |
| Single Mode 9m | 1550nm | 0.3 dB |
What is Ghost in OTDR?
‘ Ghosts are false reflective events and can be difficult to distinguish because they are nonexistent events in the OTDR trace. The most common cause of ‘ghosts’ is an ‘echo’ of light reflected back and forth multiple times between strong real reflective events until it is attenuated to the noise level.
