Bare Fiber Optic patch cord box 5km with SC/APC connectors at both sides,3.0mm yellow, single mode corning G657A1 fiber smf-28e

When using an optical time-domain reflectometer (OTDR) to measure optical fibers, sometimes there may be situations where the fiber link is very short, which makes it difficult to obtain a good evaluation and evaluation of the attenuation index. At the same time, due to the short length of the fiber optic link (usually less than 1km), the OTDR measurement curve has a certain degree of fluctuation, which affects the final numerical calculation. When measuring short fiber optic links, significant attenuation values (xxdB/km) are often obtained. At this point, we suggest adding 2km of fake fiber. As the fiber length is increased, this impact will be reduced, which can be used to verify the quality of the project.