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This paper reviews two techniques for measuring ORL: time-domain measurements and opticalcontinuous-wave reflectometry (OCWR). Both techniques are described in IEC IEC 61300-3-6. This paper will describe the differences in sensitivity between the two methods and how to generate equivalent measurements. While the OCWR method is more traditional, the newer time-domain method has become by far the most popular due primarily to its ease-of-use, increased dynamic range, and speed. As with any discussion on ORL, proper cleaning and inspection is critical and it must be stressed that the repeatability of a connection under test is a major contribution to the changes often observed.
Also, the application note presents more regarding basic measurement, power, fresnel reflections, time, techniques, fresnel reflection, mode, manual, rayleigh scattering, terminations, and width.