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We demonstrate 200-channel high-density frequency division multiplexing coherent OTDR employing apodization and nonlinear suppression schemes. The sensitivity enhancement is 13 dB by comparison with conventional coherent OTDR.
We propose a bandwidth-division phase-noise-compensated optical frequency domain reflectometry technique. Using this approach, we realize a spatial resolution of 2 cm over 40 km in a normal laboratory environment.
We show that the performance of phase-noise-compensated optical-frequency-domain reflectometry (PNC-OFDR) is affected by the acoustic phase noise caused by environmental acoustic perturbations applied to test fibers. When both the auxiliary interferometer and the fiber under test are insulated against acoustic perturbation, the theoretical spatial resolution is obtained. This means that a laser-induced...
We describe PNC-OFDR employing 3rd order sideband sweeping to realize a broader frequency sweep span. We achieved a sub-cm spatial resolution over a 10 km measurement range.
A novel WDM detection technique based on ultrafast field sampling is used to measure the chromatic dispersion of optical fibers. Its simultaneous two-wavelength detection enables direct evaluation of group delay difference without optical demultiplexing devices.
The evolution of backscattered polarization in high-PMD fibres is measured by phase-noise compensated optical frequency domain reflectometry with a 25 cm spatial resolution and a 7.5 km measurement range.
We evaluate the robustness of a butt-joint splice with refractive index matching material when a high power light is input and observe the ignition thus induced
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