KR20230131002A - Redundancy module for optical cable redundancy and OTDR combination - Google Patents

Abstract

The present invention relates to a duplication module for duplicating optical cables and combining OTDRs, and more specifically, to a duplexing module for duplicating optical cables and combining OTDR wavelengths that measure the condition of optical cables.
To this end, the duplex module for duplexing optical cables and combining OTDR of the present invention includes a terminal for receiving optical signals from transmission equipment or transmitting optical signals to transmission equipment; A terminal for receiving an optical signal from an optical cable or transmitting an optical signal through an optical cable; and a terminal for receiving light pulses from the first ODTR measuring device.

Description

Redundancy module for optical cable redundancy and OTDR combination {Redundancy module for optical cable redundancy and OTDR combination}

The present invention relates to a duplication module for duplicating optical cables and combining OTDRs, and more specifically, to a duplexing module for duplicating optical cables and combining OTDR wavelengths that measure the condition of optical cables.

The method mainly used in conventional optical networks for long-distance optical communication is to convert an electrical signal into an optical signal using a laser diode, transmit the converted optical signal through an optical cable, and when transmitting through the optical cable, This is a method of communicating by converting a weakened optical signal due to loss caused by an optical cable back into an electrical signal, amplifying it, and then converting the amplified electrical signal back into an optical signal.

However, optical cables that transmit optical signals have a very high risk of disconnection due to the surrounding environment or bending phenomenon. Therefore, the transmission of optical signals is interrupted or the smooth transmission of optical signals is not achieved due to the bending of the optical cable.

In this optical cable monitoring technology, a common device for measuring the fault condition of an optical cable is an OTDR (Optical Time Domain Reflectometer) measurement device. This OTDR measuring device applies an optical pulse to an optical cable and analyzes the reflected light returning according to the distance distribution of the light amount, measuring the distance to the loss connection point of the optical fiber, the connection loss, and the reflection amount from the connection point to the breakage point when the fiber is damaged. Measure distances, etc. Here, reflected light refers to light being reflected in a place where the refractive index of the optical fiber is non-uniform and returning in the direction of the light source. This OTDR measuring device is widely used as a measuring instrument for construction and repair of optical cables. In addition, the OTDR measuring device is a device with high resolution and is relatively expensive, so it is mainly carried and used by only experts who specialize in maintaining optical cables to inspect the condition of optical fibers.

In this way, in order to diagnose the status of an optical cable using an OTDR measurement device on an existing optical cable, a redundancy module is needed to branch the optical cable into transmission equipment and an OTDR measurement device.

Korean Patent Publication No. 2006-0079281 (Title of invention: Optical cable line failure monitoring system and monitoring method) Korean Patent Publication No. 2009-0100109 (Invention Title: Optical subscriber network optical cable monitoring device and method using optical pulse type)

The problem that the present invention aims to solve is to propose a redundant module that connects optical cables to transmission equipment and OTDR measurement equipment.

Another problem that the present invention aims to solve is to propose a duplex module that transmits optical signals using another optical cable that does not have a fault when an optical cable fails.

Another problem that the present invention aims to solve is to propose a redundant module capable of transmitting optical pulses transmitted from an OTDR measurement device through an optical cable.

To this end, the duplex module for duplexing optical cables and combining OTDR of the present invention includes a terminal for receiving optical signals from transmission equipment or transmitting optical signals to transmission equipment; A terminal for receiving an optical signal from an optical cable or transmitting an optical signal through an optical cable; and a terminal for receiving light pulses from the first ODTR measuring device.

The duplex module for duplexing optical cables and combining OTDR according to the present invention duplicates optical cables, so that when a failure occurs in one optical cable, optical signals can be transmitted and received using another optical cable. In addition, the state of the optical cable can be diagnosed when necessary by transmitting an optical pulse that diagnoses the state of the optical cable using a duplication module for duplication of the optical cable and OTDR combination. In this way, the present invention can transmit optical pulses transmitted from the optical cable duplication and OTDR measuring device by combining the duplication module for optical cable duplication and OTDR combination with transmission equipment.

Figure 1 shows an optical signal transmission system according to an embodiment of the present invention.
Figure 2 shows an optical signal transmission system including a duplication module according to an embodiment of the present invention.
Figure 3 shows a redundancy module according to an embodiment of the present invention.
Figure 4 shows the internal structure of a redundancy module according to an embodiment of the present invention.
Figure 5 shows the structure of a 4-port-LPF according to an embodiment of the present invention.
Figure 6 shows the structure of a 5-port-HPF according to an embodiment of the present invention.

The foregoing and additional aspects of the present invention will become more apparent through preferred embodiments described with reference to the accompanying drawings. Hereinafter, these embodiments of the present invention will be described in detail so that those skilled in the art can easily understand and reproduce them.

Figure 1 shows an optical signal transmission system according to an embodiment of the present invention. Hereinafter, an optical signal transmission system according to an embodiment of the present invention will be described using FIG. 1.

According to FIG. 1, the optical signal transmission system 100 includes first transmission equipment 110, second transmission equipment 120, and an optical cable. First transmission equipment 110 is connected to one end of the optical cable, and second transmission equipment 120 is connected to the other end.

The first transmission equipment 110 transmits an optical signal to the second transmission equipment 120 using an optical cable, or receives the optical signal transmitted by the second transmission equipment 120 using an optical cable. In this way, the present invention transmits and receives optical signals using transmission equipment and optical cables.

In addition, as described above, the present invention needs to be connected to an OTDR measurement device to diagnose the optical cable, and in this case, a redundancy module is needed to connect the optical cable to the transmission equipment and the OTRD measurement device.

Figure 2 shows an optical signal transmission and diagnosis system according to an embodiment of the present invention. Hereinafter, using FIG. 2, we will learn in detail about the optical signal transmission and diagnosis system according to an embodiment of the present invention.

Generally, when a failure occurs in an optical cable connected to transmission equipment, it is isolated or it takes a long time to identify the location of the failure. In order to solve this problem, the present invention proposes a duplication module that duplicates actually used optical cables and can be connected to an OTDR measurement device to quickly confirm the location of a failed optical cable.

According to FIG. 2, the redundancy module 230 of the optical signal transmission and diagnosis system 200 is connected to the transmission equipment 210 and 220, the OTDR measurement device 240, and an optical cable. Additionally, unlike Figure 1, the redundancy module 230 is connected to four optical cables. That is, as described above, the number of optical cables is increased so that optical signals can be transmitted using other optical cables in place of the failed optical cable. In addition, we propose a method of quickly confirming the location of a faulty optical cable using the OTDR measurement device 240.

To this end, as shown in FIG. 2, the duplication module 230 is connected to the transmission equipment 210 and 220, the OTDR measurement device 240, and a plurality of optical cables, and the optical signal transmitted from the transmission equipment is transmitted through the duplication module. Transmit or receive through one optical cable among a plurality of optical cables. Additionally, in order to diagnose a faulty optical cable, the redundancy module 230 transmits an optical pulse transmitted from the OTDR measurement device 240 to the faulty optical cable to confirm the location of the fault. As such, the present invention proposes a duplex module that transmits and receives optical signals and optical pulses, and the structure of the duplex module will be discussed in detail below.

Figure 3 shows the structure of a redundancy module according to an embodiment of the present invention. Hereinafter, the redundancy module structure according to an embodiment of the present invention will be described in detail using FIG. 3.

According to FIG. 3, the redundancy module 230 includes 9 terminals. Below, we will look at each terminal constituting the redundancy module 230.

The first terminal is connected to the terminal of the first transmission equipment and receives an optical signal from the first transmission equipment. The second terminal transmits an optical signal to the first transmission equipment, and the third terminal also transmits an optical signal to the first transmission equipment.

Specifically, the optical signal transmitted from the second terminal or the third terminal is transmitted to the optical monitor 210a, and the optical monitor 210a transmits the optical signal received from the second terminal or the third terminal to the optical switch 210b. Send to The optical switch 210b transmits one of the optical signals transmitted from the second terminal or the third terminal to the first transmission equipment 210. That is, the optical monitor 210a receives an optical signal from the second terminal or the third terminal connected to the optical cable without a fault, and transmits the received optical signal to the first transmission equipment 210 via the optical switch 210b. ) and send it to

The fourth terminal transmits an optical signal to the second transmission equipment, and the fifth terminal also transmits an optical signal to the second transmission equipment. Additionally, as shown in FIG. 3, the fourth and fifth terminals receive optical pulses transmitted from the OTDR measurement device 240 connected to the second transmission equipment.

A 4-port LPF (230a) and a coupler (230b) are connected between the first terminal and the fourth terminal, and the first terminal and the fifth terminal. The structure and function of the 4-port LPF (230a) will be described later. The coupler 230b branches the received optical signal and transmits it to the fourth or fifth terminal, and combines the optical pulse received from the fourth or fifth terminal to transmit it to the 4-port LPF (230a).

The sixth terminal receives the optical signal transmitted from the second transmission equipment, and the seventh terminal also receives the optical signal transmitted from the second transmission equipment. In addition, the sixth terminal receives the optical pulse transmitted from the OTDR measuring device 240 and transmits it to the second transmission equipment, and the seventh terminal also receives the optical pulse transmitted from the OTDR measuring device 240 and transmits it to the second transmission equipment. Send to

The eighth terminal receives the optical pulse transmitted from the OTDR measuring device 240, and the ninth terminal also receives the optical pulse transmitted from the OTDR measuring device 240.

The optical pulse received at the 8th terminal is transmitted to the 1-5 port-HPF (230c) and transmitted to the second transmission equipment through the 6th terminal, and the optical pulse received at the 9th terminal is transmitted to the 2-5 port-HPF (230c). It is transmitted to the HPF (230d) and transmitted to the second transmission equipment through the seventh terminal.

As shown in FIG. 3, a 1-5 port-HPF (230a) is disposed between the second terminal and the sixth terminal, and a 2-5 port-HPF (230d) is disposed between the third terminal and the seventh terminal. It is placed.

Figure 4 shows the internal structure of a redundancy module according to an embodiment of the present invention. Hereinafter, the internal structure of the redundancy module according to an embodiment of the present invention will be described in detail using FIG. 4.

The redundancy module internally includes a 4-port LPF (230a), a 5-port HPF (230c, 230d), and a coupler (230b).

As shown in FIG. 4, the 4-port LPF (230a) and coupler (230b) are disposed between the first terminal and the fourth terminal or the first terminal and the fifth terminal. That is, the optical signal received from the first terminal is transmitted to the fourth or fifth terminal via the 4-port LPF (230d) and the coupler (230b). Additionally, the optical pulses received from the fourth and fifth terminals are transmitted to the coupler 230b and the 4-port LPF (230d).

The 1-5 port-HPF (230c) is disposed between the 2nd terminal and the 8th terminal or the 6th terminal and the 8th terminal, and the 2nd port-HPF (230c) is disposed between the 3rd terminal and the 9th terminal or the 7th terminal and the 9th terminal. -5 port-HPF (230d) is deployed. To elaborate, the optical pulse input from the 8th terminal passes through the 1-5 port-HPF (230c) and is delivered to the 6th terminal, and the optical pulse input from the 9th terminal is transmitted to the 2-5 port-HPF It passes through (230d) and is delivered to the seventh terminal. In addition, the optical signal input from the 6th terminal is blocked from passing through the 1-5 port-HPF (230c) and is transmitted to the second terminal, and the optical signal input from the 7th terminal is transmitted to the 2-5 port-HPF (230d). ), it is blocked from passing and is delivered to the third terminal.

Figure 5 shows the structure of a 4-port LPF according to an embodiment of the present invention. Hereinafter, the 4-port-LPF structure according to an embodiment of the present invention will be described in detail using FIG. 5.

In general, the wavelength of an optical signal transmitted through an optical cable is 1260 to 1617 nm, while the wavelength of an optical pulse for diagnosing an optical cable is 1622.5 to 1670 nm. That is, the wavelength of the optical pulse is relatively high compared to the optical signal. Therefore, using the LPF, optical signals with relatively low wavelengths are passed through and transmitted to the coupler, and optical pulses with relatively high wavelengths are reflected (blocked from passing). Referring to FIG. 4, the optical signal input to the first terminal passes through the 4-port LPF and is transmitted to the coupler, and the optical pulse received from the coupler is prevented from passing by the 4-port LPF.

Figure 6 shows the structure of a 5-port-HPF according to an embodiment of the present invention. Hereinafter, the 5-port-HPF structure according to an embodiment of the present invention will be described in detail using Figure 6.

In general, the wavelength of an optical signal transmitted through an optical cable is 1260 to 1617 nm, while the wavelength of an optical pulse for optical cable diagnosis is 1622.5 to 1670 nm. Therefore, using the HPF, an optical pulse with a relatively high wavelength is passed through and delivered to the sixth or seventh terminal. Additionally, the optical signal that is blocked from passing is re-incident to the HPF and is blocked from passing. Since the optical signal re-incident to the HPF is blocked from passing and is transmitted to the second or third terminal, there is no optical pulse passing through the pass (2), so the corresponding port can be removed. In this way, by repeatedly blocking the passage of optical signals, the isolation characteristics are improved. In other words, it is possible to process tasks performed in two modules using one module.

In this way, the present invention can diagnose the condition of the optical cable by combining an ODTR measurement device that transmits optical pulses while duplicating an optical cable that transmits an optical signal using a duplexing module.

The present invention has been described with reference to an embodiment shown in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and other equivalent embodiments are possible therefrom. .

100: Optical signal transmission system 110, 210: First transmission equipment
120, 220: Second transmission equipment 200: Optical signal transmission and diagnosis system
230: Redundancy module 240: OTDR measuring device

Claims (10)

A terminal for receiving optical signals from transmission equipment or transmitting optical signals to transmission equipment;
A terminal for receiving an optical signal from an optical cable or transmitting an optical signal through an optical cable; and
A duplex module for duplexing optical cables and combining OTDR, comprising a terminal for receiving optical pulses from the first ODTR measuring device.
According to clause 1,
A first terminal for receiving an optical signal from transmission equipment;
A second terminal and a third terminal for transmitting optical signals to the transmission equipment;
a fourth terminal for transmitting an optical signal through a first optical cable;
a fifth terminal for transmitting an optical signal through a second optical cable;
A sixth terminal for receiving an optical signal from a third optical cable;
a seventh terminal that receives an optical signal from the fourth optical cable; and
A duplex module for duplexing an optical cable and combining the 8th and 9th terminals that receive optical pulses from the first ODTR measuring device with an OTDR.
The duplex module for duplexing optical cables and combining OTDRs according to claim 2, wherein the fourth terminal or the fifth terminal receives the optical pulse transmitted by the second OTDR measuring device through the first optical cable or the second optical cable.
4-port-LPF through which the optical signal received from the first terminal passes; and
Includes a coupler that splits the optical signal received from the 4-port LPF in a 50:50 split,
A duplex module for duplexing optical cables and combining OTDR, characterized in that the optical signal branched from the coupler is transmitted to the fourth or fifth terminal.
According to clause 4,
the coupler combining the received optical pulses to a fourth or fifth terminal;
A duplex module for duplexing optical cables and combining OTDR, characterized by the 4-port-LPF, which blocks the passage of optical pulses transmitted from the couple.
The method of claim 5, wherein the 4-port LPF has 4 ports,
Among the optical pulses and optical signals input to the first port, the optical signal with a relatively low wavelength is passed through and transmitted to the coupler.
A duplex module for duplexing optical cables and combining OTDR, characterized in that optical pulses with a relatively high wavelength are passed through and transmitted to the third port.
The duplex module for duplexing an optical cable and combining an OTDR according to claim 2, wherein the eighth or ninth terminal transmits an optical pulse transmitted by a first OTDR measuring device.
The duplex module for duplexing optical cables and combining OTDR according to claim 7, comprising a 1-5 port-HPF that filters the optical pulse received from the 8th terminal and the optical signal received from the 6th terminal. .
The method of claim 8, wherein the 1-5 port-HPF has 5 ports,
Among the optical pulses and optical signals input to the first port, the optical pulse with a relatively high wavelength is passed through and delivered to the sixth terminal through the second port,
Optical signals with relatively low wavelengths are blocked from passing, output to the third port, and then re-incident to the fourth port.
A duplex module for duplexing optical cables and combining OTDR, characterized in that the re-incident optical signal is blocked from passing and transmitted to the second terminal via the fifth port.
The duplex module for duplexing optical cables and combining OTDR according to claim 9, comprising two 5-port HPFs including the 1-5 port-HPF.

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