OTDR (Optical Time Domain Reflectometer) is an important optical fiber testing instrument. It is mainly used to test the fiber optic cables in the field, and can test the fiber optic cables in the pipeline, in the wall and other places. The pulse width of OTDR is one of its key parameters, which has a great impact on the testing results.

The pulse width of OTDR refers to the width of the pulse emitted by the OTDR instrument. The smaller the pulse width, the higher the resolution of OTDR. But, the smaller pulse width, the shorter cable the OTDR can test. Therefore, in order to obtain more accurate testing results, it is necessary to appropriately adjust the pulse width of OTDR according to the characteristics of the tested fiber optic cables and the cable length that is tested.

In general, the pulse width of OTDR is adjustable within a certain range. It can be adjusted by users. When adjusting the pulse width, it should be noted that if the pulse width is too small, OTDR can not test long fiber cable. Therefore, it is necessary to balance the relationship between the fiber cable length and the testing accuracy.

In addition, different models and brands of OTDR may have different pulse width adjustment ranges and methods. Therefore, when using OTDR, it is recommended to consult the relevant technical specifications or consult professionals to ensure that the testing results are accurate.

In summary, OTDR is an important tool for testing fiber optic cables. The pulse width adjustment of OTDR is one of its key parameters, which has a great impact on the testing results. Therefore, it is necessary to appropriately adjust the pulse width according to the characteristics of the tested fiber optic cables and testing requirements to obtain more accurate testing results.