A high-resolution optical fiber lengths meters, a detector for a living ("live ") fibers, and reflection test device (instrument) for single-mode applications, that a laser with low energy and long wavelengths for generating wide and narrow optical pulses are used which, in a single-mode fiber are transmitted in the test. The fiber optic connectors of the laser - outputs is connected to a single-mode coupler fusion spliced, whose output to a "bulk head " connector of the instrument is coupled. A pin - photodiode is fusion spliced to a single-mode coupler, in order to allow the of the fiber in the test for receiving light reflected. The high-resolution hand - instrument is useful in the checking of single-mode passive optical networks (pon).
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