US 6,160,614 A · Method, apparatus and computer program product for classification of measured data from multi-core optical fiber

Abstract

There is provided a method, an apparatus and computer program product for the classification of measured data from a multi-core optical fiber, wherein even with event points which are difficult to distinguish or with identical event points and when there are deviations in distances between event points, connection losses and the like for all event points can be classified. Measured waveform data measured using an OTDR apparatus is read in. Then level differences with connection losses which coincide or exceed a predetermined threshold value are identified as event points, and the event information related to the event points is obtained. Next the event information related to the head core optical fiber is registered in a master file. Then an interval distance between adjacent event points registered in the master file is obtained. After this, event points which exist within a predetermined allowable range of the event points registered in the master file are searched out from each event point in the object core optical fiber, and determined to be identical event points. Then if the event distance of the object core optical fiber is less than the event distance registered in the master file, the event information registered in the master file is updated using the event information for the object core optical fiber. After this, of the event points included in the object core optical fiber, all the event information related to event points which are not identical event points is registered in the master file. Then the processing described above are executed for all core optical fibers. Finally connection losses and the like are classified for each event point.

Claims19

Dependent claims

An apparatus for classification of measured data from a multi-core optical fiber comprising:

event information generating means which extracts all event points from measured waveform data for each core optical fiber obtained by conducting an optical pulse test on a multi-core optical fiber, and generates for each of said event points, event information which includes distance data for a path of said optical fiber,
master event determining means for searching for all groups of identical event points from amongst said all of the event points, and determining the event information related to one of the event points of said identical event points for each of said searched for groups as master event information, and
classifying means for computing for each of said core optical fibers, based on said master event information and said measured waveform data, characteristic data of said optical fiber relating to each event point which corresponds to said master event information.

A method for classification of measured data from a multi-core optical fiber said method involving:

detecting all event points from measured waveform data for each core optical fiber obtained by conducting an optical pulse test on a multi-core optical fiber,
generating for each of said event points, event information which includes distance data for a path of said optical fiber,
searching for all groups of identical event points from amongst said all of the event points,
determining the event information related to one of the event points of said identical event points for each of said searched for groups as master event information, and
computing for each of said core optical fibers, based on said master event information and said measured waveform data, characteristic data of said optical fiber relating to each event point which corresponds to said master event information.

2 more elements

A method for classification of measured data from a multi-core optical fiber said method having:

a step for detecting all event points from measured waveform data for each core optical fiber obtained by conducting an optical pulse test on a multi-core optical fiber,
a step for generating for all of said event points, event information which includes distance data for a path of said optical fiber,
a step for storing in a master file said event information of one of said core optical fibers selected from said core optical fibers as a head core optical fiber,
a step for selecting a core optical fiber other than said head core optical fiber as an object core optical fiber,
a searching step for judging event points which occur within an allowable range, based on event point distances corresponding to each event information stored in the master file, to be mutually identical event points, and searching out the event information relating to the event points judged to be identical from the event information of said object core optical fiber,
step for determining one event information from the event information judged to be identical as master event information, and replacing the event information within the master file with this master event information,
a registration step for registering in said master file all of the event information from the event information relating to said object core optical fiber which is not the same as the event information stored in said master file,
a step for sequentially changing the object core optical fiber and repeating each step from said searching step to said registration step for all of the core optical fibers other than said head core optical fiber, and
a step for computing for each said core optical fiber based on said event information and said measured waveform data stored in said master file, characteristic data of the optical fiber for each event point corresponding to the stored event information in said master file.

6 more elements

A computer program product having a computer usable recording medium on which a classification processing program which can be read by a computer is recorded, said program having:

a step for detecting all event points from measured waveform data for each core optical fiber obtained by conducting an optical pulse test on a multi-core optical fiber,
a step for generating for each of said event points, event information which includes distance data for a path of said optical fiber,
a step for searching for all groups of identical event points from amongst said all of the event points,
a step for determining the event information related to one of the event points of said identical event points for each of said searched for groups as master event information, and
a step for computing for each of said core optical fibers, based on said master event information and said measured waveform data, characteristic data of said optical fiber relating to each event point which corresponds to said master event information.