fiber optic hadling
its critical to certify fiber connector end face to prevent insertion loss
Fiber link certification
Insertion loss Example
Testing insertion loss with a Fluke Networks’ CertiFiber Pro OLTS provides an easy pass/fail indication based on the type of fiber under test and the application test limits, indicating the overall loss of the link and the length. As shown in the insertion loss example below, the dotted line indicates what’s included in the measurement and the “Detail” window shows the margin and allowable limits for the fiber at both wavelengths.
Insertion Loss Testing Procedure for Optical Fiber
Insertion loss testing in today’s multimode fiber optic systems requires the use of encircled flux (EF) launch conditions to reduce measurement uncertainty. This method controls how the light is launched into a fiber under test to prevent an overfilled launch that can potentially cause a pessimistic result or an underfilled launch that can result in an optimistic result. Fluke Networks only provides EF-compliant testers and test reference cords for 850 nm and 1300 nm for all multimode fiber types. Learn more about EF compliance.
The default testing procedure for insertion loss testing is the 1-jumper method that includes the loss of the connections at both ends, which is ultimately how the cabling plant will be used. To accurately test the loss of the first and last connectors, they must be mated to a similar, known quality connector using Test Reference Cords (TRCs). TRCs are high quality test cords that are terminated with reference grade connectors and optical alignment of fiber cores that exhibit an extremely low loss of less than 0.2 dB for single-mode and less than 0.1 dB for multimode. Typical fiber jumpers used for normal day-to-day patching range between 0.3 dB and 0.5 dB and should not be used for testing.
To account for the loss of the TRC, an OLTS must be calibrated to 0 dB of loss by setting a reference—a concept similar to placing a bowl on a scale and then calibrating the scale to zero to achieve an accurate weight for whatever is in the bowl.
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