OTDR (Optical Time Domain Reflectometer) is used for test a fiber cable. By OTDR, users can get these parameters of a fiber, Fiber Length Total attenuation Event List Point Loss Break Location Micro Bending Loss @wavelengths (1310nm, 1550nm, etc) Splitter’s insertion loss Return Loss etc Some modern OTDRs integrates with many other common functions, VFL


The optical time domain reflectometer (OTDR) sends a series of light bursts into the optical fiber for processing test. The way to test is to receive the light signal on the same side of the incoming, because the incoming signal will scatter and reflect back when it encounters a medium of different refractive indexes. The

The Sor is a file format which is often create by OTDR. The file saves OTDR traces information like fiber length, attenuation, return loss and OTDR itself information, and some other filed (record) that added by OTDR users. Generally, sor files can not opened directly by normal softwares/applications. Every OTDR manufacturer provide their own particular