KR100337664B1 - Interactive transmission module using single fiber-line - Google Patents

Abstract

The present invention relates to a bidirectional communication module by a single optical fiber. In the present invention, the optical path changer 20 and the wavelength division transmitter 30 are used to enable bidirectional communication through one optical line L. FIG. At this time, the state of the light path (L) by detecting the wavelength of the light source 40 using a different light to detect the presence or absence of the light path (L). According to the present invention as described above, there is an advantage that the optical signal can be transmitted in both directions using one light path (L).

Description

Interactive transmission module using single fiber-line}

The present invention relates to a bidirectional communication using an optical fiber, and more particularly to a bidirectional communication module using a single optical fiber line.

Due to the trend of changing the wired communication network into an optical cable, there is a huge demand for the optical cable, and various ways to improve the utility of the optical cable have been studied. One method for this is the time division multiplexer (TDM) method, which enables a large amount of information communication by modulating the optical signal incident on the optical cable, which can be transmitted with a capacity of about 10Gbps.

As another method, there is a method of maximizing information processing capacity by integrating signals processed by TDM method in parallel for each wavelength of a light source used in a single optical cable.

Currently, WDM, DWDM, etc., which are in the spotlight, are all attributed to this. Up to now, 4 to 32 optical signals, which are separately signal-processed for each wavelength in one optical fiber, are bundled into a passive optical device and incident on a single optical cable to extend the usage capacity of a single optical cable to 80 Gbps.

Therefore, newly installed optical cables and installed equipment are all being applied as a specification capable of multi-channel communication by using multi-wavelength.

FIG. 1 illustrates a main configuration of an optical communication network using two optical paths in order to implement bidirectional communication. According to this, the first line 1 and the second line 2 for transmitting signals are connected to the optical connector at the connection part 5 (for example, the distribution box or the distribution panel). A first transmitter T1, a second transmitter T2, a first receiver R1, and a second receiver R2 are connected to the first line 1 and the second line 2, respectively.

In order to implement two-way communication as described above, two optical lines must be used, and recently, newly installed optical cables and installed equipment are all applied as a specification capable of multi-channel communication by using multi-wavelength.

However, at the present time when the proportion of optical cables and equipment installed before this type of facility is much higher, there is a need for improving the efficiency of using equipment such as optical cable lines and transmitters that are already used in a single wavelength.

On the other hand, currently, the only way to perform two-way communication by separating the optical signal transmitted in both directions in a single line is to separate the transmission and reception by using a three-port circulator element in both systems of the transmitter. That is, as shown in Figure 2, the circulators (C1, C2) are installed at both ends of the single line (1) connected by the optical connector (5), respectively, the first and second transmitters (T1, T2) and The first and second receivers R1 and R2 are provided.

However, this method differs in refractive index with air in the optical fiber side at the separation part or the breakage part when the connector is disconnected from the optical connector of the connection part 5 located on the track 1 or the line 1 is broken. Generated by the retroreflected light is about 3% to 4%, and is reversely progressed. And the transmitter (T1, T2) signals are not distinguished, so it is impossible to separate the connector on the line and check the abnormality of the line.

Accordingly, an object of the present invention is to solve the conventional problems as described above, and to enable bidirectional communication using a single optical path.

1 is a schematic configuration showing a configuration for bidirectional communication by a plurality of optical paths in the prior art.

Figure 2 is a schematic diagram showing a configuration for bidirectional communication by a single optical fiber according to the prior art.

Figure 3 is a block diagram showing the configuration of a preferred embodiment of one side module of the bidirectional communication module by a single optical line according to the present invention.

Figure 4 is a block diagram showing the configuration of a preferred embodiment of the other module of the bidirectional communication module by a single optical line according to the present invention.

Figure 5 is a schematic configuration showing that the two-way communication module is installed on both ends of a single optical line in the embodiment of the present invention.

Figure 6 is an operating state showing the operation of the light path is separated in the embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

10,10 ': Module 12: Case

20: optical path changer 22, 24: connector

23,23 ': transmitter 25,25': receiver

30: wavelength division transmitter 35: connector

40: light source 41: status light

42: optical splitter 44: first photodetector

46: second photodetector 50: connection

According to a feature of the present invention for achieving the above object, the present invention is an optical path switcher for irreversibly transferring light between a receiver and a transmitter and one external optical path, and whether the external optical path is separated or damaged And a line splitting detector for detecting and dividing or converging the light of the line status detecting unit and the optical path switching unit.

The line state detection unit is provided in each module installed at both ends of the external light path, one module includes a light source for providing a light for detecting the line state, and a first light detector for detecting the retroreflected light generated when the light line is short-circuited And an optical splitter for transmitting the retroreflected light generated when the light is short-circuited between the light source and the photodetector to the first photodetector.

The line state detector provided in the other module is a second photo detector connected to an external optical line through the wavelength division transmitter.

The signal transmitted between the receiver and the transmitter and the signal generated from the light source have different wavelengths.

According to the present invention having such a configuration, it is possible to perform bidirectional communication using a single optical line, and thus there is an advantage in that facility efficiency of an optical cable line and a transmitter used in the existing single wavelength band can be improved.

Hereinafter, a preferred embodiment of a bidirectional communication module using a single optical fiber according to the present invention as described above will be described in detail with reference to the accompanying drawings.

The communication modules 10 and 10 'according to the present invention are respectively installed at both ends of a single optical path L, and the configuration thereof is illustrated in FIGS. 3 and 4, respectively.

First, the configuration of one side communication module 10 shown in FIG. Various configurations are provided in the case 12 of the communication module 10. That is, an optical path switcher 20 capable of connecting two transmission / reception signals to one optical path L by irreversibly changing the path of the transmitted light may be connected to the transmitter 23 and the receiver 25. Connected to the connectors 22 and 24. The connectors 22 and 24 are connected to a transmitter 23 for providing a signal for transmission through the optical path L and a receiver 25 for receiving a signal transmitted through the optical path L, respectively.

A wavelength division transmitter 30 is installed to be connected to the optical path changer 20. The wavelength division transmitter 30 divides signals having different wavelengths so that they can be simultaneously transmitted through the optical path L. The wavelength division transmitter 30 is connected to the optical path L through the connector 35. The wavelength division transmitter 30 may use a Wave Length Multiplexer (WDM).

On the other hand, the structure for detecting the state of the said optical path L is demonstrated. First, the transmitter 23 and the receiver 25 are provided with a light source 40 for generating light of a wavelength different from the wavelength of the light used for signal transmission. The light source 40 is connected to the state light 41 for visually displaying the operating state of the light source 40 is installed to be exposed to the outside of the case 12. The light source 40 may use a laser diode.

An optical coupler 42 is provided between the light source 40 and the wavelength division transmitter 30. The optical splitter 42 serves to transfer the retroreflected light generated at the time of shorting of the optical path L to the side of the first photodetector 44 which will be described below.

The first photodetector 44 is connected to the optical splitter 42. The first photodetector 44 detects the retroreflected light that is emitted from the light source 40 and is reflected along the light path L and is reflected from the shorted portion. A state light 45 for outputting a signal detected by the first photodetector 44 is provided to be exposed to the outside of the case 12. A photodiode may be used as the first photodetector 44.

FIG. 4 shows a configuration of a module 10 ′ connected with the module 10 and the light path L shown in FIG. 3. As shown in the figure, an optical path changer 20 is provided inside the case 12 and is connected to the transmitter 23 'and the receiver 25' through connectors 22 and 24, respectively. The optical path changer 20 serves to irreversibly transmit light between the transmitter 23 ', the receiver 25' and the optical path L.

The optical path changer 20 is provided with a wavelength division transmitter 30. The wavelength division transmitter 30 is connected to the optical path L through a connector 35, and has a light source 40 having a wavelength different from that transmitted from the transmitter 23 ′ and the receiver 25 ′. Branched light).

A second photodetector 46 is connected to the wavelength division transmitter 30. The second photodetector 46 detects light coming from the light source 40 of the module 10 and transmitted through the light path L to detect that the line state is normal. The second light detector 46 is connected to a state light 47 that is exposed to the outside of the case 12. The state light 47 serves to display a state in which light transmitted from the light source 40 is detected.

Hereinafter, the use of the modules 10 and 10 'of the present invention having the configuration as described above connected to both ends of the optical path L will be described with reference to FIG.

According to FIG. 5, communication modules 10 and 10 ′ are connected to both ends of a single optical path L through connectors 35, respectively. And the light path L is provided with a distribution box or a distribution panel which is the connection part 50 for connecting the light path L. As shown in FIG.

In this state, the signal transmitted from the transmitter 23 of the module 10 is transmitted to the wavelength division transmitter 30 through the optical path changer 20. In addition, the wavelength division transmitter 30 is transmitted to the other communication module 10 'through the connection part 50 through the optical path L.

In the other communication module 10 ', an optical signal is transmitted from the wavelength division transmitter 30 to the optical path changer 20, and the optical signal is transmitted from the optical path changer 20 to the receiver 25'. .

On the contrary, the optical signal from the transmitter 23 'is transmitted to the wavelength division transmitter 30 through the optical path switcher 20, and the module through the optical path L in the wavelength division transmitter 30. Is passed to (10). In the module 10, an optical signal is transmitted from the wavelength division transmitter 30 to the optical path changer 20, and is transmitted from the optical signal changer 20 to the receiver 25.

On the other hand, the optical signal for detecting the state of the optical path (L) is passed from the light source 40 through the optical splitter 42 to the wavelength division transmitter (30). In this case, since the wavelengths of the optical signals from the transmitters 23 and 23 ′ and the optical signals from the light source 40 are different from each other, they may be simultaneously transmitted by the wavelength division transmitter 30. In the state where light is emitted from the light source 40, the state light 41 is turned on.

The optical signal from the light source 40 is transmitted through the optical path L and transmitted to the module 10 '. The module 10 ′ is delivered to the wavelength division transmitter 30 via the connector 35, where it is delivered to the second photodetector 46. As such, when the light of the light source 40 is detected by the second photodetector 46, the optical path L is in a normal state. At this time, the state lamp 47 is turned on.

Next, FIG. 6 shows that the optical path L is separated from the connection part 50. In this state, one side of the optical path L is damaged and the connection is separated.

In this state, the optical signal from the transmitter 23 is transmitted from the optical path changer 20 to the wavelength division transmitter 30, and the optical signal transmitted from the wavelength division transmitter 30 to the optical path L is a line. It returns to the short circuit state and is transmitted to the receiver 25 through the wavelength division transmitter 30 and the optical path changer 20.

On the other hand, the light emitted from the light source 40 is transmitted to the wavelength division transmitter 30 through the optical splitter 42, and is transmitted from the wavelength division transmitter 30 to the optical path (L). However, this light is also returned to the optical splitter 42 from the wavelength division transmitter 30 by the short-circuit state of the optical path L, and the first photodetector 44 at the optical splitter 42. Is delivered.

Next, the optical signal from the transmitter 23 'of the module 10' connected to the other side of the optical path L passes through the optical path changer 20 and the wavelength division transmitter 30 to the optical path L. Is returned to the receiver 25 'via the wavelength division transmitter 30 and the optical path changer 20 of the module 10'.

In such a state, that is, the light path L is short-circuited, the state light 41 of the light source 40 and the state light 45 of the first light detector 44 are turned on. In addition, since the light of the light source 40 cannot be transmitted to the second photodetector 46, the state lamp 47 is in an enlarged state. Therefore, the user can simply check the abnormality of the light path (L).

As described in detail above, according to the bidirectional communication module using the single optical path according to the present invention, the optical signal transmitted through the optical path is transferred using an optical path changer, and the light having different wavelengths is used to check the abnormality of the optical path. This allows the two-way communication to be performed using a single optical fiber.

Claims (4)

An optical path changer for irreversibly transferring light between a receiver and a transmitter and one external optical path, A line state detection unit detecting whether the external light path is separated or damaged; And a wavelength division transmitter configured to branch or focus light of the line state detection unit and the light path switching unit. According to claim 1, wherein the line state detection unit is provided in each module provided at both ends of the external light path, One module includes a light source for providing light for detecting a line state, A first photodetector for detecting retroreflected light generated when a short circuit occurs; And a light splitter configured to transfer the retroreflected light generated when the light is short-circuited between the light source and the photodetector to the first photodetector. The bidirectional communication module according to claim 2, wherein the line state detection unit provided in the other module is a second light detector connected to an external optical line through the wavelength division transmitter. The bidirectional communication module according to any one of claims 1 to 3, wherein the signal transmitted between the receiver and the transmitter and the signal generated from the light source have different wavelengths from each other.