Title:
【発明の名称】光パルス試験方法
Document Type and Number:
Japanese Patent JP3335574
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain a test method in which the peak level of reflected light can be measured with high accuracy, by making a value which normalizes the light receiving level of an OTDR waveform measured in such a way that beams of reflected light from a plurality of optical filter-type reflectors are measured overlappingly an input, and computing the position of every coated optical filter and the peak level of every beam of reflected light. SOLUTION: In Step SA1 (SA1), 30 points which use s reflected waveform as the center are cut out, a light receiving level in the parts is designated as Pi, and peaks of overlapped reflected waveforms are designated as Ra, Rb. Then, in SA2, a normalization operation is performed. In SA3, a normalized data string PNi is used as the input data of a neural network NN, and normalized reflection peak levels RNa, RNb are used as teacher signals which are outputted by the neural network NN. In SA4, while an optical path length difference DEF and the peak level and the peak level of every beam of reflected light are being changed by an optical branching filter, a data set for learning is classified into data sets for universal evaluation. In SA5, while the data set for learning is being used, the learning of the neural network NN is performed, and the learning is repeated until a teacher signal and an output error become small. In SA6, the peak level of reflected light is computed. In SA7, the neural network NN is evaluated for every optical path length difference DEF.
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Inventors:
Noriyuki Araki
Yoshitaka Enomoto
Nobuo Tomita
Yoshitaka Enomoto
Nobuo Tomita
Application Number:
JP3777298A
Publication Date:
October 21, 2002
Filing Date:
February 19, 1998
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G01D5/353; G01D5/26; G01M11/00; G06F15/18; G06N3/00; (IPC1-7): G01M11/00; G06F15/18
Domestic Patent References:
| JP653907A | ||||
| JP954011A | ||||
| JP8247897A | ||||
| JP868722A | ||||
| JP9329526A | ||||
| JP7103959A |
Attorney, Agent or Firm:
Masatake Shiga