WO2014193059A1

WO2014193059A1 - Apparatus for measuring optical time domain

Info

Publication number: WO2014193059A1
Application number: PCT/KR2013/010937
Authority: WO
Inventors: 최영복; 강창호; 이광훈; 신정식
Original assignee: (주)파이버피아
Priority date: 2013-05-31
Filing date: 2013-11-28
Publication date: 2014-12-04

Abstract

The present invention relates to an apparatus for measuring an optical time domain. The apparatus for measuring an optical time domain comprises: a light generating unit for generating a monitoring light, which is a reference waveform, by receiving an optical pulse, and introducing the generated monitoring light into the optical time domain; a light sensing unit for receiving a measurement waveform that is the light reflected from the optical time domain; and a control unit for generating and transmitting, to the light generating unit, a pulse generation signal for generating the reference waveform and receiving the measurement waveform from the light sensing unit, and generating a loss amount graph by using the reference waveform and the measurement waveform, wherein the loss amount graph shows, as a loss amount value according to a distance, a difference between the loss amount of the reference waveform and the loss amount of the measurement waveform. Thus, an administrator who monitors the optical time domain can check the total loss amount of the optical time domain, thereby increasing the management efficiency of the optical time domain.

Description

Optical path measuring device

The present invention relates to an optical fiber measuring apparatus.

The high-speed information communication network using optical communication can be divided into a backbone network and a local network, and one example of the subscriber network is a fiber to the home (FTTH) subscriber network.

The FTTH subscriber network is a network that connects from the telephone station to the subscriber's home network using optical fiber. Optical fibers are made of thin strands of glass or plastic, and service providers monitor the optical fiber installed in the FTTH subscriber network to ensure that there is no disruption to the optical communication service provided to the subscriber.

At this time, an optical time domain reflectometer (OTDR), which is a device for measuring a failure state of an optical fiber (or an optical cable including the same), receives reflected light returned by injecting an optical pulse into the failure state measurement optical fiber. According to the distance distribution of the amount of reflected light, the loss of the optical fiber, the distance to the splice point, the splice loss, the amount of reflection from the splice point, and the broken distance when the fiber is broken are measured.

However, such a conventional optical path measuring device is a structure that analyzes the failure point by using the event occurrence point of the reflected light, the alarm is often generated for the optical loss event generated at the connector connection or the optical fusion point to measure the optical path There is a problem that causes a malfunction of the device.

In addition, since the optical fiber monitoring method using the optical fiber measuring device monitors only the failure point of the optical fiber, it is difficult to grasp the total loss variation of the optical fiber.

The technical problem to be achieved by the present invention is to detect the actual failure of the optical path using the reflected light of the optical path, and to detect the total amount of loss generated in the optical path.

An optical path measuring apparatus according to an aspect of the present invention receives a light pulse and generates a monitoring light that is a reference waveform, and receives a light generating unit for injecting the generated monitoring light into the optical path, and receives the measurement waveform which is reflected light reflected from the optical path. A light sensing unit and a pulse generating signal for generating the reference waveform are generated and transmitted to the light generating unit, the measurement waveform is received from the light sensing unit, and a loss graph is obtained using the reference waveform and the measurement waveform. And a control unit to generate the loss graph. The loss amount graph may represent a difference between the loss amounts of the reference waveforms and the loss amounts of the measurement waveforms.

The display device may further include a display unit configured to output at least one of the reference waveform, the measurement waveform, and the loss amount graph.

The measurement waveform may have power loss or waveform deformation when a failure occurs in the optical path, and the loss amount graph may have different inclinations according to the waveform change generated in the measurement waveform.

According to this feature, the controller generates a graph indicating the optical path loss using the measurement waveform and the reference waveform, and thus, the overall optical path loss of the measurement waveform can be monitored using the generated graph.

1 is a block diagram schematically illustrating an optical path measuring apparatus according to an exemplary embodiment of the present invention.

2 is a graph illustrating waveforms output from a controller of an optical fiber measuring apparatus according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Next, an optical path measuring apparatus according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

First, the optical path measuring apparatus according to an embodiment of the present invention will be described in detail with reference to FIG. 1.

Referring to FIG. 1, the optical path measuring apparatus 100 according to an exemplary embodiment of the present invention includes a light generating unit 30 and a light generating unit 30 that allow the monitoring light 1 to enter the optical path 200. A control unit 10 connected to the pulse generator 20, the pulse generator 20, and the optical amplifying unit 50, and the optical amplifying unit 50, respectively. ) Is provided with a light detecting unit (40).

The pulse generator 20 receives a pulse generation signal from the controller 10 to generate a pulse, and transmits the generated pulse to the light generator 30.

The light generator 30 generates and outputs an optical signal according to the pulse received from the pulse generator 20.

At this time, the light output from the light generating unit 30 is a monitoring light to be incident on the optical path 200 for monitoring the optical path 200, the reference waveform.

The optical sensor 40 receives an optical signal from the outside and transmits the received optical signal to the optical amplifying unit 50.

The optical signal transmitted to the light detector 40 is reflected light output from the optical path 200.

The optical amplifier 50 amplifies the optical signal received from the optical sensor 40 and transmits the amplified optical signal to the controller 10.

The optical signal transmitted from the light sensing unit 40 to the optical amplifying unit 50 is reflected light reflected from the optical path 200 and may be an optical signal having a weak intensity. Therefore, it is preferable that the optical amplifier 50 amplifies the optical signal transmitted to the optical detector 40 and outputs the signal as an identifiable signal.

The controller 10 outputs a pulse generation signal to the pulse generator 20 to generate the monitoring light as the reference waveform, and receives the reflected light, which is the measurement waveform of the optical path 200, from the optical amplifier 50. .

At this time, the controller 10 generates a loss amount graph using the reference waveform transmitted to the pulse generator 20 and the measurement waveform of the optical path 200 received from the optical amplifier 50.

A loss amount graph generated by the controller 10 will be described in more detail with reference to FIG. 2.

First, as shown in FIG. 2A, the reference waveform 1 transmitted from the controller 10 to the pulse generator 20 has a loss (dB) graph shape according to a distance t, and the controller The measurement waveform 2 of the optical path 200 received by the optical amplification unit 5 has a graph shape having a loss of first to fifth losses 1a to 1e relative to the reference waveform 1. Has

In this case, the measurement waveform 2 causes a loss due to near-end Fresnel reflection at the first time point t1 and a loss due to connection loss at the second and third time points t2 and t3.

For this reason, the measurement waveform 2 has a loss from the reference waveform 1 by the first loss 1a.

In addition, the measurement waveform 2 causes losses due to connector fusion at the fourth to sixth time points t4, t5, and t6, respectively. For this reason, the measurement waveform 2 has the 2nd loss 1b, the 3rd loss 1c, and the 4th loss 1d from the reference waveform 1, respectively.

In addition, the measurement waveform 2 has a loss due to a failure at the seventh time point t7, and after the eighth time point t8, there is no Fresnel reflection and no longer has power. For this reason, the measurement waveform 2 has the fifth loss 1e from the reference waveform 1.

As described above with reference to (a) of FIG. 2, the reference waveform 1 and the measurement waveform 2 appear in the controller 10, respectively, and the controller 10 includes the reference waveform 1 and the measurement waveform 2. ) To generate a loss amount graph (3) as shown in (b) of FIG.

Referring to FIG. 2 (b), the loss amount graph 3 generated by the controller 10 will be described in more detail. The loss amount graph 3 is a graph showing loss (dB) according to a distance t. The difference between the amount of loss of the waveform and the measured waveform is shown.

That is, the loss amount graph 3 has a 'reference waveform-measurement waveform' value according to the distance t, which is the first to fifth losses 1a to 1e shown in FIG.

At this time, the slope of the loss amount graph 3 is changed at the second time point t2, the third time point t3, the fourth time point t4, and the seventh time point t7. This is because the amount of loss in each time interval is different as shown in FIG.

As described with reference to FIG. 2B, since the loss amount graph 3 generated by the controller 10 represents a loss according to the distance t, the loss amount of the optical path 200 may be detected. It becomes possible.

In addition, it is possible to use the material for maintenance of the optical path 200 by confirming the change in the total loss amount of the optical path 200 from the graph of FIG.

As such, the optical path measuring apparatus 100 including the pulse generator 20, the light generator 30, the light detector 40, the optical amplifier 50, and the controller 10 may have an OTDR (Optical Time Domain). Reflectometer).

The optical path measuring apparatus 100 may include a display unit.

The display unit outputs (a) graphs 1 and 2 of FIG. 2 and (b) graph 3 of FIG. 2 output from the controller 10. For this reason, the manager using the optical path measuring apparatus 100 may check the graphs 1 to 3 to monitor the state of the optical path 200.

Next, with reference to FIGS. 1 and 2 will be described the operation of the optical path measuring apparatus according to an embodiment of the present invention.

First, the controller 10 outputs a pulse generation signal for generating a reference waveform to the pulse generator 20, and the pulse generator 20 generates a pulse according to the pulse generation signal received from the controller 10. It generates and delivers the generated pulse to the light generator 30.

The light generator 30 generates a reference waveform, which is monitoring light, according to the pulse received from the pulse generator 20, and enters the light path 200.

Then, the light detector 40 receives the measurement waveform which is the reflected light reflected from the optical path 200 from the optical path 200, and transmits the received optical path 200 measurement waveform to the optical amplification unit 50. do.

Next, the optical amplification unit 50 amplifies the measurement waveform received from the optical sensing unit 40 and transmits the amplified measurement waveform to the controller 10.

The controller 10 outputs the reference waveform 1 transmitted to the pulse generator 20 and the measurement waveform 2 of the optical path 200 received from the optical amplifier 50, respectively, and the reference waveform ( 1) compares the measurement waveform (2) and outputs the loss graph (3) generated.

As a result, the total amount of loss of the optical path 200 can be confirmed, and thus it can be used for failure prevention.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

Claims

A light generating unit for receiving the light pulse to generate the monitoring light as a reference waveform and incident the generated monitoring light into the optical path;

An optical sensing unit receiving a measurement waveform which is reflected light reflected from the optical path;

And a controller configured to generate a pulse generation signal for generating the reference waveform and transmit the generated pulse signal to the light generator, receive the measurement waveform from the light detector, and generate a loss amount graph using the reference waveform and the measurement waveform. and,

And the loss amount graph indicates a difference between the loss amount of the reference waveform and the loss amount of the measurement waveform as a loss amount value according to a distance.
In claim 1,

And a display unit for outputting at least one of the reference waveform, the measurement waveform, and the loss amount graph.
In claim 1,

The measurement waveform is a power loss or waveform is deformed when a failure occurs in the optical path,

The loss amount graph is an optical fiber measuring apparatus having a different slope in accordance with the waveform change generated in the measurement waveform.