KR100875046B1 - Divergence rate variable optical splitter with surveillance - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a variable splitting optical splitter having a monitoring function, wherein the splitting ratio of an optical splitter, which is an essential element in the development of a passive optical network (PON), is variably controlled and is applied to the optical splitter. The present invention relates to a splitting ratio variable optical splitter having a monitoring function for monitoring an optical path through an provided monitoring port. To this end, the present invention selectively adjusts the split ratio of the optical splitter by selectively using a 1 × 2 optical coupler and a 2 × 2 optical coupler, and uses a 1 × 2 wavelength division multiplexing (WDM) element. By providing a monitoring port on the optical splitter, it is possible to monitor the optical fiber network of the passive optical communication network. Accordingly, the present invention provides an effect of quickly responding to the demands of the optical wiring zone and including a monitoring function to reduce the maintenance cost of the optical fiber network by monitoring the optical fiber network of the passive optical communication network.

Description

Variable optical splitter with monitoring function

1 is a block diagram of a conventional optical splitter.

2 and 3 are embodiments of a passive optical communication network to which the optical splitter of FIG. 1 is applied.

4 is a block diagram of a branch ratio variable optical splitter according to the present invention.

5 to 8 are embodiments of a passive optical communication network to which the branching rate variable optical splitter of FIG. 4 is applied.

Figure 9 is another embodiment of a branch ratio variable optical splitter with a monitoring function according to the present invention.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a variable split optical splitter having a monitoring function, wherein the splitting ratio of an optical splitter used in a passive optical network (PON) is variably adjusted and an optical path is provided through a monitoring port of the optical splitter. The present invention relates to a divergence rate variable optical splitter with a monitoring function for monitoring.

In general, a passive optical network (PON) has a great advantage in reducing infrastructure construction costs by sharing a single optical fiber with several optical network units (ONU). Passive optical networks share optical paths using optical splitters that can distribute optical power. Currently available Asynchronous Transfer Mode (ATM) -PON systems allow up to 1 x 32 branched structures. That is, up to 32 optical communication network units can be connected to one optical line terminal (OLT) located at a telephone station.

1 shows an internal configuration diagram of a conventional optical splitter.

The conventional 1x8 optical splitter 4 is composed of 1x2 optical couplers 1a-1g, branched from one input port 2 and provided with eight output ports 3.

The conventional optical splitter 4 is configured in a form having a desired branching ratio by connecting several 1 × 2 optical couplers 1a to 1g in series. In addition, the general optical coupler is made by fusion-splicing the appropriate length of two optical fiber pieces side by side, it may be composed of 2 × 2 optical coupler with two input ports, two output ports during the manufacturing process. Here, the 1 × 2 optocouplers 1a to 1g may be completed by cutting and removing one input port from the 2 × 2 optocoupler.

Usually, in order to develop an efficient passive optical network, a two-stage branching structure in which optical splitters are installed inside and outside the telephone company, respectively, is considered.

2 shows a case where one OLT 5 accommodates eight optical wiring zones 9. An OLT 5 and a 1 × 8 optical splitter 4 are provided inside the telephone station 6 to operate eight optical wiring zones 9, and a 1 × 4 optical splitter outside the telephone station 6 7) and an optical communication network unit 8 are installed to operate four optical communication network units 8 in one optical wiring area 9.

3 shows a case where one OLT 11 accommodates four optical wiring zones 15. An OLT 11 and a 1 × 4 optical splitter 10 are provided inside the telephone station 12 to operate four optical wiring zones 15, and a 1 × 8 optical splitter outside the telephone station 12. 13) and an optical communication network unit 14 are installed to operate eight optical communication network units 14 in one optical wiring area 15.

2 and 3 are applicable when four optical network units 9 are installed in one optical wiring zone 9 and eight optical network units 15 are installed, respectively, when the initial optical line is invested. Structure.

However, in the case of FIG. 3, only half of the optical wiring area 15 that can be accommodated by one OLT 11 is shown in FIG. 2, and the optical communication network unit 14 is connected to one optical wiring area 15. 8 will be installed. Therefore, in terms of initial investment, the risk of investment may be high if the demand for the optical fiber for the region is not accurately secured.

Therefore, at the initial investment, as shown in FIG. 2, the optical wiring zone 9 can be secured as much as possible to accommodate one OLT 5, and the optical light that can be installed in one optical wiring zone 9 is provided. Reducing the number of network units can be advantageous in terms of investment. In addition, when the demand of the optical fiber increases, it is an efficient method to change the structure of the passive optical communication network in the case of FIGS. 2 to 3 while increasing the number of systems.

Therefore, if the demand of the optical fiber is correctly secured, the structure of the passive optical communication network must be changed from the structure as shown in FIG. 2 to the structure as shown in FIG. However, when changing the structure of the passive optical communication network of FIG. 2 as shown in FIG. 3, the structure of the existing 1x8 optical splitter 4 is changed to 1x4 optical splitter 10, and the 1x4 optical splitter ( A problem arises in which the structure of 7) must be changed to the 1x8 optical splitter 13. Accordingly, there is a problem that a lot of costs are generated due to the change of the optical splitter when expanding the business of the passive optical communication network.

The present invention was created in order to solve the above problems, and implements a variable rate splitting optical splitter that can variably adjust the splitting ratio, and remotely monitors the optical path of the passive optical communication network through the variable splitting optical splitter The purpose is to make it possible.

Branch rate variable optical splitter with a monitoring function of the present invention for achieving the above object, 1 × 2 optocoupler having one input port and the input line of the plurality of input ports selectively connected and having two output lines And one input line of one of the input lines is selectively connected to the output port of the 1 × 2 optocoupler, and the other input line is selectively connected to the plurality of input ports, and the plurality of two having two input / output ports, respectively. A plurality of 1x2 optocouplers having a number corresponding to the output lines of the x2 optocoupler and the plurality of 2x2 optocouplers, respectively, and the input lines of the 1x2 optocoupler and the 2x2 optocoupler are optional. It is characterized by controlling the branch ratio of the output port variably by blocking.

According to the present invention, the branching ratio of the optical splitter can be variably adjusted by selectively using a 1 × 2 optical coupler and a 2 × 2 optical coupler, and an optical fiber is obtained by using a 1 × 2 wavelength division multiplexing (WDM) element. By providing a monitoring port on the splitter, it is possible to configure the monitoring network for the passive optical communication network.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention.

4 is a block diagram of a branch ratio variable optical splitter 40 according to the present invention.

The branch ratio variable optical splitter 40 shown in FIG. 4 is connected to the output ports of the 1x2 optocouplers 20a, 20d to 20g and the 1x2 optocoupler 20a each having one input port and two output ports. The input ports are connected to each other and have 2x2 optocouplers 20b and 20c having two input / output ports. In addition, the WDM elements 21 are connected to the input / output ports 22 to 26, respectively.

Here, the optical core wires connected to the 2x2 optical couplers 20b and 20c may be connected to one input port 22 or the input port 24 while the optical core wires connected to the input line of the 1x2 optical coupler 20a are blocked. ), Four output ports 25 or 26 are connected via 1 × 2 optocouplers (20d, 20e or 20f, 20g) so that the split ratio variable optical splitter 40 can be used as a 1 × 4 optical splitter. have. The signal light input to the input port 22 is output from the output port 25, and the signal light input to the input port 24 is output from the output port 26.                     

Further, when the optical core wire connected to the input lines of the 2x2 optical couplers 20b and 20c is blocked, and the optical core wire connected to the 1x2 optical coupler 20a is connected to one input port 23, 1 It is connected to the eight output ports (25, 26) through the x2 optical couplers (20d ~ 20g) it is possible to use the branch ratio variable optical splitter 40 as a 1x8 optical splitter. The signal light input to the input port 23 is output from all the output ports 25 and 26.

Therefore, since the branch ratio variable optical splitter 40 according to the present invention can be used as two 1 × 4 optical splitters or one 1 × 8 optical splitter, the branching ratio can be varied.

In addition, the monitoring ports 27 to 37 are ports for constructing a monitoring network of optical paths, and allow only the monitoring light separated from the signal light to pass through the WDM element 21. In addition, the monitoring ports 27 to 37 may be used when individually testing the optical cores connected to the input / output ports 22 to 26 after the initial optical core connection or during the operation of the system.

5 to 8 illustrate an exemplary embodiment in which a passive optical communication network is operated using the branching rate variable optical splitters 40 and 43 of FIG. 4.

FIG. 5 shows an example in which branch ratio variable optical splitters 40 and 43 are installed and operated in the optical wiring area 45 where the demand is equal during initial supply of the optical path. The telephone station 42 is provided with a 1 × 8 light splitter 40 connected to one OLT 41, and the outside of the telephone station 42 is provided with a 1 × 4 light splitter 43. It is connected to the network unit 44.

6 shows an example in which branch ratio variable optical splitters 40 and 43 are installed and operated in the optical wiring area 45 where the demand is uneven during initial supply of the optical path. Here, a difference from FIG. 5 is that one or two 1 × 4 optical splitters 43 are operated outside the telephone station 42. FIG.

FIG. 7 shows an example in which branch ratio variable optical splitters 40 and 43 are installed and operated when the system is expanded due to increased demand of the optical path. Inside the telephone company 42, a branching rate variable optical splitter 43 connected to two OLTs 41 is provided, and the branching rate variable optical splitter 43 is operated as two 1 × 4 optical splitters. In addition, eight branch rate variable optical splitters 40 are provided outside the telephone station 42, which operate as a 1x8 optical splitter. Therefore, since eight optical communication network units 44 are connected to one 1 × 8 optical splitter 40, up to 64 optical communication network units 44 may be connected and used.

FIG. 8 illustrates an example in which a branch ratio variable optical splitter 40 is installed and operated when the performance of the passive optical communication network system supporting up to 1 × 32 branch is improved to branch to 1 × 64. At this time, the branch ratio variable optical splitter 40 inside and outside the telephone company 42 is operated as a 1x8 optical splitter.

As described above, in the embodiments of the present invention, an example in which two 1 × 4 optical splitters or one 1 × 8 optical splitter is operated is illustrated. However, the present invention is not limited thereto, but may be operated with two 1 × 2 optical splitters or one 1 × 4 optical splitter, or may be operated with two 1 × 8 optical splitters or one 1 × 16 optical splitter. It may also be made of a splitting ratio variable optical splitter operated with two 1x16 optical splitters or one 1x32 optical splitter.                     

On the other hand, Figure 9 is a block diagram of a branch ratio variable optical splitter with a monitoring function according to the present invention.

The branch ratio variable optical splitter 70 including a monitoring function includes an optical jumper line 53 connecting the monitoring port 52 and the monitoring port 54, output ports 62a to 62d, 63a to 63d, and an optical fiber. The operational optical fibers 64a to 64h connecting the network units 67a to 67h, respectively, and the spare optical fibers corresponding to the WDM elements 51c, 51e, 51g, 51i, 51k, 51m, and 51o, respectively. 65a-65g), and the monitoring light interruption filter 66 provided in front of the optical communication network unit 67h.

Referring to the operation of the branch ratio variable optical splitter with a monitoring function of the present invention having such a configuration as follows.

First, when signal light and monitoring light are input to the input port 50 of the branch ratio variable optical splitter 70, the signal light and the monitoring light input by the WDM element 51a are separated. Then, the signal light is input to the 1x2 optical coupler 20a, only the monitoring light is input to the monitoring port 52, and is input to the monitoring port 54 through the optical jumper line 53.

Subsequently, the monitoring light is outputted to the output port 62a by the WDM element 51b and along the operating optical line 64a together with the signal light transmitted to the output port 62a through the 1x2 optical coupler 20d. It is guided to the optical communication network unit 67a.

Thereafter, the signal light reaching the WDM element 51c is input to the optical communication network unit 67a. On the other hand, the monitoring light is separated from the signal light by the WDM element 51c and transmitted to the monitoring port 55 of the branch ratio variable optical splitter 70 along the preliminary optical line 65a.

The monitoring light is then combined with the signal light by the WDM element 51d and guided toward the optical communication network unit 67b along the operational optical line 64b. The monitoring light separated from the signal light by the WDM element 51e is returned to the monitoring port 56 of the branch ratio variable optical splitter 70 along the preliminary optical line 65b.

After all, the monitoring light traces all the operating optical lines 64a to 64h and the spare optical lines 65a to 65g connected to the optical communication network units 67a to 67h by the WDM elements 51a to 51p, and finally the monitoring light. It is sent to the cut filter 66. Here, the monitoring light blocking filter 66 blocks the monitoring light applied through the operating optical fiber 64a from being input to the optical communication network unit 67h.

As described above, the monitoring network for monitoring the optical cores connected to the optical communication network unit of the passive optical communication network can be configured by using the monitoring ports provided in the branch ratio variable optical splitter 70 according to the present invention. In addition, the monitoring ports may be utilized as ports for optical fiber testing during initial installation of a passive optical network or during operation of the optical network.

Here, although the embodiment of FIG. 9 illustrates an example of configuring a monitoring network when the branch ratio variable optical splitter 70 is operated as a 1 × 8 optical splitter, the monitoring network may be configured as a 1 × 4 optical splitter without being limited thereto. have.

As described above, the present invention provides the following effects.

First, in order to change the branching structure of the passive optical communication network according to the change of optical fiber demand, it is possible to reduce the future investment cost by variably operating the branching ratio of the optical splitter without replacing the optical splitter.                     

Second, it is possible to monitor the condition of the optical fiber by constructing the monitoring network using the variable splitting ratio optical splitter to prevent the optical fiber failure in advance and to quickly identify the failure point when the optical fiber failure occurs to minimize service downtime. Provide effect.

Third, it is possible to flexibly cope with the demand of the passive optical network in the development of the passive optical network business.

Claims (7)

A 1 × 2 optocoupler having one input port and a plurality of input lines selectively connected to one of the plurality of input ports and having two output lines; One input line of one of the input lines is selectively connected to the output port of the 1 × 2 optocoupler, and the other input line is selectively connected to the plurality of input ports, and a plurality of two having two input / output ports, respectively. X 2 optocouplers; And A plurality of 1 × 2 optocouplers each having a number corresponding to output lines of the plurality of 2 × 2 optocouplers; And a branching rate variable optical splitter with a supervisory function, wherein the branching ratio of the output port is variably controlled by selectively blocking the input lines of the 1x2 optical coupler and the 2x2 optical coupler. The method of claim 1, A plurality of wavelength division multiplexing elements corresponding to the plurality of input ports; And a plurality of monitoring ports respectively connected to the input port and the output port through the plurality of wavelength division multiplexing elements. The method of claim 2, wherein the monitoring port And an optical jumper line for connecting at least one monitoring port provided at the input port line and at least one monitoring port provided at the output port line. Splitter. The method of claim 1, 10. A splitting ratio variable optical splitter with a supervisory function comprising a variable splitting ratio optical splitter operated by two 1 × 2 optical splitters or one 1 × 4 optical splitter. The method of claim 1, 10. A splitting ratio variable optical splitter with a supervisory function comprising a variable splitting ratio optical splitter operated by two 1 × 4 optical splitters or one 1 × 8 optical splitter. The method of claim 1, 10. A splitting ratio variable optical splitter with a supervisory function comprising a variable splitting ratio optical splitter operated by two 1x8 optical splitters or one 1x16 optical splitter. The method of claim 1, 10. A splitting ratio variable optical splitter with a supervisory function comprising a variable splitting ratio optical splitter operated by two 1 × 16 optical splitters or one 1 × 32 optical splitter.

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