KR20130068681A

KR20130068681A - Coded fbg and otdr sgnal optical multiplexing optical connector

Info

Publication number: KR20130068681A
Application number: KR1020110136000A
Authority: KR
Inventors: 윤재순; 이경신; 최기선; 백세종; 임기건
Original assignee: (주)럭스콤
Priority date: 2011-12-16
Filing date: 2011-12-16
Publication date: 2013-06-26

Abstract

According to the present invention, by assigning a spectral tag that can be identified using a plurality of FBGs for each subscriber, it is possible to identify subscribers regardless of distance information and to determine whether there is an abnormality in a line, so that FBG coding can be utilized as a sensor for monitoring a line. A multifunction optical connector capable of reflecting OTDR signal light.
To this end, the present invention is provided in the optical connector that is installed at the end of the optical subscriber network to reflect the optical signal for monitoring, the optical connector is to give the spectrum of the incoming light when the input of the optical signal for monitoring by specifying the spectrum of the reflection wavelength by the pitch interval A plurality of optical fiber gratings (FBGs) encoding the optical subscribers and a chirped optical fiber grating for outputting a wavelength change according to temperature and tension change are inserted into a ferrule.

Description

CODED FBG AND OTDR SGNAL OPTICAL MULTIPLEXING OPTICAL CONNECTOR}

The present invention relates to a multi-function optical connector capable of FBG coding and OTDR signal light reflection, and more particularly, relates to distance information by assigning a spectral tag that can be identified using a plurality of FBGs for each subscriber. The present invention relates to a multi-function optical connector that can identify subscribers and identify line faults, and can be used as a sensor for monitoring a line and reflects OTDR signal light.

Currently, OTDR (Optical Time Domain Reflectometer) is the most commonly used monitoring device for the operation and maintenance of optical fiber for optical subscriber network.

In this method, the monitoring filter device is inserted in a specific part of the optical path section, and the reflected light received through the reflection of the termination filter is measured by the base station to determine whether it is in normal operation, the location of the fault site, and the bending or It is used to obtain a lot of information such as old age.

However, this method is useful for monitoring transmission intervals with a point-to-point structure, but in a passive optical network (PON) with a point-to-multipoint structure, all branches with one OTDR It is not easy to monitor the fiber.

This is because the traces of backscattered light coming back from the end of the individual branch fiber can overlap each other.

As a result, efforts have been made to improve the resolution of the OTDR, but ultimately, the line length cannot be solved without overlapping between the subscribers at a distance greater than the resolution of the OTDR.

Moreover, when a subscriber applies for service at an unspecified location, it is not easy to find a way to adjust the length every time, and accurate line length information is needed to check the line information on the optical subscriber network. Due to this, there were many structural difficulties in determining the optical subscriber based on the distance information of the OTDR.

For example, the OTDR generates different monitoring pulses with time difference and calculates the time required when the pulse signal is reflected and returns, and measures the distance. The length information of is different from the actual distance information.

Therefore, based on the length information obtained from the OTDR, the telecommunication company identifies the optical subscribers through the GIS and the telecommunication company DB and determines the abnormality of the optical path.The length information obtained from the OTDR shows a difference from the actual distance information. In such a dense area, there was a problem that it was extremely difficult to identify the optical subscriber.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and by assigning a spectral tag that can be identified using a plurality of FBGs for each subscriber, the subscribers can be identified regardless of distance information and the line can be identified. The company aims to provide a multifunction optical connector that can be used as a sensor for monitoring light beams and reflects OTDR signals.

In order to solve the above problems, the present invention provides an optical connector installed at an end of an optical subscriber network and reflecting an optical signal for monitoring, wherein the optical connector is configured to reflect reflected wavelengths by pitch intervals of incoming light when the optical signal for monitoring is input. It is characterized in that a plurality of optical fiber gratings (FBGs) are coded to distinguish the optical subscribers by assigning a specific spectral tag and a chirped optical fiber grating for outputting wavelength changes according to temperature and tension changes is inserted into a ferrule.

The spectrum tag is characterized by assigning a spectral tag that can be identified using two optical fiber grids every 32 quarters of the E-PON standard.

The optical signal for monitoring is characterized in that the wavelength of 1610 ~ 1640nm.

The monitoring optical signal is characterized in that the wavelength of 1635 ~ 1665 nm.

The optical connector is characterized in that the SC type, FC type, LC type or MU type.

Receiving the reflection wavelength of the optical connector through the optical circulator is characterized by spectral spectroscopy with a spectroscope to give an identification code for distinguishing the optical subscriber.

The optical fiber grating is characterized in that at least two or more are embedded in the ferrol.

According to the present invention, by assigning a spectral tag that can be identified using a plurality of FBGs for each subscriber, subscribers can be identified regardless of distance information.

In addition, it is possible to detect a change in wavelength due to external temperature or tension through the superposed optical fiber grating.

Therefore, the FTTH modem equipped with a plurality of FBG and FBG filters and a spectrum tag method for identifying them have an effect of establishing a surveillance system capable of efficiently managing subscriber networks even in densely populated areas such as urban areas.

1 is an exemplary diagram of a multifunction optical connector capable of reflecting FBG coding and OTDR signal light in accordance with the present invention;
2 is an exemplary diagram for assigning a subscriber tag of a multifunctional optical connector capable of FBG coding and OTDR signal light reflection according to the present invention;
Figure 3 is an example of checking whether the FBG coded and the OTDR signal light reflection of the multi-function optical connector in accordance with the present invention.
4 is an exemplary diagram illustrating whether the FBG coded and the OTDR signal light reflected according to the present invention reflects a change in the external environment of the multifunction optical connector.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of a multi-function optical connector capable of FBG coding and OTDR signal light reflection according to the present invention.

First, the present invention is preferably applied to an optical connector installed at the end of an optical subscriber network and reflecting an optical signal for monitoring.

1 to 4, the optical connector according to the present invention is a plurality of optical fiber grating for encoding the spectrum of the incoming light when inputting the monitoring optical signal to distinguish the optical subscriber by assigning a specific spectrum tag of the reflected wavelength by the pitch interval A chirped fiber grating that outputs a wavelength change with (FBG), temperature, and tension is inserted into a ferrule.

In the above technical configuration, the reflection wavelength of the optical connector is introduced into the spectrometer by the optical circulator, and the spectral result corresponding to the preset spectral pitch interval is derived.

Therefore, by assigning a code for identifying the optical subscriber to the derived specific spectrum tag it is possible to identify the line of the subscriber.

Looking at the relationship between the multiplexed spectrum and each subscriber with reference to FIG. 3, it is possible to confirm that the optical paths of the subscribers 1 and 3 given to the spectral wavelengths are disconnected because the spectrums of λ1 and λ3 are not derived.

In addition, referring to FIG. 4, when the ferrol is deformed due to temperature or tension change, the changed wavelength is output from the chirped optical fiber grating to check whether there is an abnormality in the optical path, and thus, the spectra of the plurality of optical fiber gratings overlap. In this case, even if each spectrum overlaps, it is possible to determine which light beam is transformed by the wavelength output from the plurality of spectrums by having a specific spectrum tag.

In the above technical configuration, the spectral tag is assigned a spectral tag that can be identified using two optical fiber gratings every 32 quarters of the E-PON standard.

Accordingly, even in the future, as the subscriber network increases, the base station may establish a monitoring network simply by adding additional equipment.

In addition, the present invention is suitably applied to the 1610 ~ 1640nm wavelength and 1635 ~ 1665nm wavelength as the optical signal for monitoring, it can be applied to various optical connectors such as SC type, FC type, LC type or MU type.

a: ferrule

Claims

In the optical connector installed at the end of the optical subscriber network to reflect the optical signal for monitoring,
The optical connector includes a plurality of optical fiber gratings (FBGs) that encode a spectrum of incoming light when the optical signal for monitoring is input to distinguish the optical subscribers by assigning a specific spectrum tag to the reflected wavelength by the pitch interval, and the wavelength according to the temperature and tension change. A multi-function optical connector capable of f-video coding and orthodial signal light reflection, wherein a chirped optical fiber grating is inserted into a ferrule.

The method of claim 1,
The spectrum tag is a multi-function optical connector capable of f-video encoding and orthoral signal light reflection, characterized in that the spectral tag is assigned by using two optical fiber grids every 32 quarters of the E-PON.

The method of claim 1,
The optical signal for monitoring is 1610 ~ 1640nm wavelength characterized in that the F-B-coded and orthodial signal light reflector is a multi-function optical connector.

The method of claim 1,
The optical signal for monitoring is characterized in that the wavelength of 1635 ~ 1665 nm FBV coded and ortho-dial signal light reflection capable of a multi-function optical connector.

The method of claim 1,
Wherein the optical connector is SC type, FC type, LC type or MU type complex function optical connector capable of reflecting the f-video coded and OTialial signal.

The method of claim 1,
A multi-function optical connector capable of f-video coding and Odiial signal light reflection, characterized in that the reflection wavelength of the optical connector is received through the optical circulator and spectral spectroscopic spectroscopic spectrometer with a spectroscope to give an identification code to distinguish the optical subscriber.

The method of claim 1,
And at least two optical fiber gratings are inserted into the panel.