KR100896372B1 - Apparatus for hand - operated supervising and measuring the hindrance of an optical fiber of optiacal network and the method thereof - Google Patents

Abstract

The method for monitoring and measuring optical fiber failure of a passive optical network according to the present invention is mainly provided with an apparatus for monitoring and monitoring failure of optical fibers of a passive optical network on the engine room side, and at the end of each branch route of the passive optical network. A specific monitoring measurement wavelength reflection component is installed on the front of the optical network unit, and then replaced by an optical channel selector with an optical line to be measured in sequence, and an optical signal of a monitoring band is input to the optical line for wavelength division. After matching by the multiplexer, the optical signals of the service and monitoring bands are advanced into the optical fiber to be measured, reaching the ends of each branch route via optical cables, optical splitters, and the specified monitoring wavelength Go into the reflective component, and within the specific monitoring wavelength reflection component, When only the optical signal of wavelength is reflected on the engine room side, the optical spectrometer on the engine room side simultaneously receives and measures the optical signal of different monitoring measurement wavelengths reflected and returned from each branch route, thereby acquiring and analyzing the latest waveform data. The latest situation of each branch optical fiber route is judged.

Description

Apparatus for hand-operated supervising and measuring the hindrance of an optical fiber of optiacal network and the method

The present invention relates to an apparatus and method for monitoring and monitoring optical fiber failure of a passive optical network of simple and low cost.

With the rapid growth of the global Internet, traditional networks are unable to respond to the high-speed information transmission and application units that caused the communication revolution, while the maturation of the photovoltaic industry and the diversification of product applications are rapidly growing. The best solution was provided for the large-scale broadband required for the Internet, high-quality multimedia networks and various digital communications. Accordingly, various optical communication network frames appear one after another, and a passive optical network service system is most expected among them. If the service system is to be used in large quantities in the future, it is necessary to develop an apparatus and a method for easily monitoring and monitoring each branch route of the passive optical network in response to the monitoring and measuring needs of the special network frame.

Due to the problem of inherent frame design of each branch route, it is inherently difficult to monitor optical fibers with passive optical networks. Previously, the monitoring method by optical time domain reflectometer (OTDR) Although present, the signal after all branches overlapped on the trajectory diagram of the optical time domain reflectometer, and thus could not identify any branch route alone. At this time, it was possible to add a manual identification assembly to the terminal of the branch route to solve the identification problem, but since the communication network and the control computer on the engine room side must be operated in both directions, the complexity of the monitoring system is sometimes increased; Moreover, although the reflection unit was added to the long displacement optical fiber and comprised by the identification assembly, since the long and short end of a branch route did not correspond, there existed a difficulty in both a design and installation. In particular, in such a method in which the optical time domain reflectometer is used as the monitoring body, when the number of routes is increased, for the purpose of limiting the dynamic range and the event dead zone of the optical time domain reflectometer, sometimes, Surveillance of the goals has become impractical.

On the other hand, by using a tunable laser light source, an optical circulator, or an optical power meter, and by combining the design of the optical fiber Bragg Grating (FBG) at the terminal, the purpose of monitoring the failure Could achieve. However, in the case of measuring only each branch optical fiber route, it was not possible to display the real-time situation of all the routes at the same time, and it was also necessary to switch the wavelength tunable laser light source to the monitoring wavelength in a different order, The more it takes, the longer it takes.

As can be understood from the foregoing, the above-described conventional method also has many drawbacks, it is difficult to say good design, and improvement is required.

The inventors of the present invention have attempted new improvements in view of the drawbacks of the above-described conventional methods, and have succeeded in the research and development of the monitoring and measuring apparatus and method for the optical fiber disorder in the passive optical network. .

The main object of the present invention is to monitor and measure the disconnection or optical loss of the optical fiber route on the engine room side, whether it is a problem of the service system or the optical fiber route, and clearly indicate the fault route and condition, It is to provide an apparatus and method for monitoring and measuring the optical fiber failure of a passive optical network that can reduce operating costs and increase maintenance efficiency.

In order to achieve the above object, the apparatus and method for monitoring and measuring optical fiber failure of a passive optical network provided by the present invention uses another set of monitoring wavelengths and optical powers reflected from the passive optical network using a set of optical fiber monitoring apparatus. To monitor and monitor the fiber optic failures in real time. Mainly, the optical spectrometer is used to measure the optical power and other monitoring wavelengths reflected from the optical network in real time, and the control computer performs comparative analysis on the measured data to determine the latest state of the branched optical fiber route, It is based on the warning and subsequent processing processors.

Referring to Figure 1, the optical fiber failure monitoring device of the passive optical network provided by the present invention includes a broadband monitoring light source module 16; An optical circulator 17; An optical spectrometer 19; A control computer 18; A wavelength division multiplexer 13; And an optical channel selector 24.

Among them, the main apparatus for monitoring measurement is in the engine room 10, and the optical line terminal 11 (OLT) transmits the optical signal of the service band 12 to the wavelength division multiplexer 13, The wideband supervisory measurement light source module 16 of the supervisory measurement device uses the optical circulator 17 to match the optical signal of the monitoring frequency band 15 with the wavelength division multiplexer 13 by matching the optical signals of these two types of frequency bands. It transmits, and it further reaches the optical splitter 21 via the optical fiber 14 and the optical fiber 20 outside the engine room, spectroscopically in many branch optical fiber routes, and reaches the terminal of each route. The matched optical signal is input to a particular surveillance measurement wavelength reflection component 22. Here, the optical signal of the service wave band 12 passes through a specific monitoring measurement wavelength reflection component 22 to enter the optical network unit 23 (ONU), thereby providing user service. On the other hand, when the optical signal of the monitoring band 15 enters the specific monitoring wavelength reflection component 22, only the specific monitoring wavelength is reflected, and other wavelengths in the monitoring band 15 are filtered and diverged therein. Each particular surveillance wavelength reflection component 22 in the route cannot reflect only another surveillance wavelength. The monitoring measurement wavelength after reflection enters the wavelength division multiplexer 13 in the order of the optical splitter 21, the optical cable 20, and the optical fiber 14 along the opposite direction and passes through the optical circulator 17. It is received and measured by the spectroscopic analyzer 19 to further obtain a reflection waveform diagram (see FIG. 2) of the whole branch optical fiber root terminal. The control computer 18 introduces this waveform diagram, performs comparative analysis on the reflected waveform 191 of the other route, obtains up-to-date information of the whole branched optical fiber route, and also carries out subsequent processes such as warnings. It is possible to make the basis for performance.

The monitoring frequency band used for this invention is not limited to the 1625 nm frequency band, A 1310 nm frequency band and a 1550 nm frequency band can be used as a monitoring frequency band.

The present invention can also be combined with an optical channel selector (OCS) 24 (see FIG. 3), and the monitoring and measurement principle is the same as in FIG. However, the addition of an optical channel selector increases the number and area of optical fiber routes that need to be replaced and monitored by different optical channels depending on the monitoring processor via the control computer, and increases the use efficiency of the monitoring device. It is possible to lower the unit cost.

The foregoing detailed description is a specific description of the executable embodiments of the present invention, and the embodiments are not intended to limit the scope of the claims of the present invention, but equivalent implementations or changes may be made without departing from the spirit of the present invention. It is intended to be included in the claims of the present invention.

In summary, the present invention is not only creatively creative in terms of technical ideas, but also has many of the above-mentioned effects not achieved by conventional methods, and already satisfies the requirements of the legal invention patent claim of sufficient novelty and progressiveness. It is clear that there is.

The apparatus and method for measuring optical fiber failure monitoring of a passive optical network according to the present invention has the following advantages over other prior arts.

1. The present invention provides an apparatus and method for monitoring and measuring optical fiber failure of a passive optical network having a viable, reliable, simple, and economical effect by combining with a specific monitoring measurement wavelength reflection component of a terminal by a monitoring measurement apparatus on the engine room side. It is possible to provide.

2. In the present invention, on the passive optical network, monitoring and measurement of the latest status of 64 or more branch routes can be displayed at the same time, and it is possible to quickly realize the goal of mass monitoring.

3. In the present invention, the single-end of the engine room can also perform long-term automatic monitoring measurement, eliminate the obstacles of the service system or the optical fiber route quickly and accurately, and also preventively maintain the latest state of each branch route, and more preferable service. Can provide quality.

4. The present invention can secure the reliability and stability of the passive optical network and improve the maintenance efficiency by lowering the labor cost of network operation, so the economic effect is extremely clear.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic diagram of an apparatus and method for monitoring and monitoring optical fiber failure of a passive optical network according to the present invention.

2 is a waveform diagram displayed on a spectroscopic analyzer of the optical fiber failure monitoring and method of the passive optical network.

FIG. 3 is a schematic diagram illustrating an optical channel selector of the optical fiber failure monitoring and measuring apparatus of the passive optical network applied to a plurality of optical fiber routes. FIG.

<Description of the code>

10: engine room

11: Optical line terminal (OLT)

12: service band

13: Wavelength Division Multiplexer (WDM)

14: optical fiber

15: Monitoring wave band

16: Broadband Surveillance Measurement Light Source Module

17: Optical Circulator

18: control computer

19: Optical Spectral Analyzer

20: optical fiber

21: Optical Splitter

22: Particular surveillance measurement wavelength reflection component

23: Optical Network Unit (ONU)

24: Optical Channel Selector (OCS)

191: reflected wave of the other route

Claims (4)

Optical fiber for optical characteristics after reflection, transmission and filtration of input light by a specific monitoring measurement wavelength reflection component by constructing a monitoring device for optical fiber failure of a passive optical network using an optical network of one or more branch routes. An optical fiber fault monitoring device of a passive optical network which achieves the purpose of fault monitoring of A broadband monitoring light source module for continuously transmitting a light source of a monitoring band; An optical circulator for receiving the surveillance light source and sending it to the optical network, and further sending the surveillance light source reflected back from the optical network to an optical spectrometer; An optical spectrometer for measuring other power measurement wavelengths and optical power reflected back from the optical network; A control computer for acquiring waveform diagrams measured by the optical spectrometer and controlling the entire surveillance measurement processor; A wavelength division multiplexer for matching service bands and monitoring bands to optical fibers; An optical channel selector for monitoring more optical fibers and subsequent branch routes by a set of monitoring devices by connecting the optical channels of the monitoring frequency band and a plurality of wavelength division multiplexers and switching the optical channels. Optical fiber obstacle monitoring device of a passive optical network, characterized in that. In the method for monitoring the optical fiber failure of a passive optical network, A first step of providing an apparatus for monitoring the optical fiber failure of the passive optical network on the engine room side and installing a specific monitoring wavelength reflection component in front of the optical network unit of the terminal of each branch route of the passive network; After replacing the optical channel selector with the optical line to be sequentially controlled and controlled, input the optical signal of the monitoring band to the optical channel, match it with the wavelength division multiplexer, and then monitor and measure the optical signal of the service band and the monitoring band. The optical signal of the specific wavelength measurement wave reflection is carried out in the optical fiber, the optical splitter, and the terminal of each branch route to reach the terminal of each branch route. A second step in which only the reflection is reflected back to the engine measurement; The optical spectrometer on the engine room side comprises: a third step of acquiring and measuring optical signals of different monitoring wavelengths reflected and returned from each branch route, thereby acquiring the latest waveform data; A fourth step of determining and analyzing the reflected waveform data by comparing the presence or absence of a waveform of the monitored measurement wavelength after reflection and the magnitude of the optical power for each waveform data; And monitoring the optical fiber failure of the passive optical network comprising a fifth step of determining the latest status of each corresponding branch optical fiber route. The method of claim 2, The fifth step is to analyze and determine the presence or absence of the acquired measurement wavelength after reflection and the magnitude of the optical power. If the specific monitoring wavelength waveform corresponding to the root of a portion disappears, it indicates that the branch route is disturbed. How to monitor and measure fiber optic failures in passive optical networks. The method of claim 3, wherein The fifth step indicates that an abnormality occurs in the branch route when the optical power decreases, and when the magnitude of the weak optical power is close to the original position, the optical fiber failure of the passive optical network indicating that the branch route is normal is measured and monitored. Way.