Patent ID: 7110098
Filing Date: 2006-09-19
Classification: G01M

Abstract:
1. A method utilizing an optical time domain reflector (OTDR) to measure an optical loss of a DUT having a first end and a second end, comprising the steps of: coupling an optical signal into a first coupler, said first coupler coupling a first part of the optical signal towards the first end of the DUT and coupling a second part of the optical signal towards a first detector, determining the optical power of the optical signal on the base of measurement of the first detector, reflecting the first part of the optical signal at the second end of the DUT to send back a reflected optical signal into the DUT, receiving the reflected signal and an accumulated backscatter of the DUT at a second detector, determining a reflected optical power of the reflected optical signal by the second detector, wherein the OTDR includes at least the second detector, and evaluating a two-way optical loss on the basis of the determined optical power of the optical signal and the determined reflected optical power of the reflected optical signal.