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AssigneesAndo Electric Co., Ltd., The Kansai Electric Power Co., Inc.
InventorsTakao Minami, Nobuaki Takeuchi, Naoyuki Nozaki, Koichi Shinozaki, Takamu Genji
Estimating the term…
A testing device performs testing on a multistage multi-branch optical network, which contains optical lines (such as optical fibers) that are connected together at connection points (e.g., optical couplers) in a multistage multi-branch manner. An OTDR measurement device uses software to perform fault determination with respect to the multistage multi-branch optical network. Herein, optical pulses are input to an input end of the multistage multi-branch optical network, wherein they are reflected at certain portions of the optical lines and the connection points while propagating through the optical lines. Then, reflected beams are returned to the input end and are mixed together as response light, which is measured by the OTDR measurement device. The response light is converted to a plurality of digital waveform data representing a measured waveform, which is then divided into multiple ranges on the basis of the Fresnel reflection points and connection points. Separative analysis is performed on the digital waveform data belonging to each of the ranges of the measured waveform. The separative analysis is repeated at measuring times, which are determined in advance. So, the fault determination is made by comparing results of the separative analysis, which are obtained at the measuring times respectively. By the fault determination, it is possible to determine a fault line and a fault location (or fault distance) as well as a fault time.
A testing device which introduces optical pulses to a branch point of a multistage multi-branch optical network so that the optical pulses progress in multiple optical lines from the branch point, wherein the optical pulses are reflected by each of portions lying between a near end and a terminal end of each of the optical lines so that at the branch point, reflected optical pulses are mixed to form response light, based on which the testing device measures a characteristic of the multistage multi-branch optical network, said testing device comprising:
A testing method for a multistage multi-branch optical network containing optical lines, which are connected together at connection points in a multistage multi-branch manner, comprising the steps of:
A machine-readable media storing a software program that causes a computer equipped with an OTDR measurement device to perform a testing method for a multistage multi-branch optical network containing optical lines, which are connected together at connection points in a multistage multi-branch manner, wherein the testing method comprises:
Dependencies are inferred from the claim text.