By using an optical time domain reflectometer a new measurement technique which allows displaying the length dependence of the fiber attenuation by analyzing backscattered light has been developed. This paper compares the backscatter and insertion-loss techniques. In addition, results of several experiments which illustrate the versatility of an optical time domain reflectometer are described.
An experiment is reported that demonstrates the ability of the optical-time-domain reflector (OTDR) to locate and characterize small waveguide perturbations. Single microbends, as small as 10 microm in amplitude, were located and characterized. The experiment indicates a potential new application for the OTDR characterization of waveguide perturbations.
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