Optical Transmission Equipment

Abstract

An aspect of the present invention is an optical transmission device comprising: a connection unit which can be connected to a reception module, which receives an optical fiber, so as to perform optical communication; an optical switch to which the optical signal is input from the connection unit and which outputs an optical signal to the connection unit; an optical switch control unit which controls the optical switch; an upward wavelength multiplexing and demultiplexing unit which multiplexes light of a plurality of wavelengths output from the optical switch, and outputs the multiplexed light to an optical transmission line; and a downward wavelength multiplexing and demultiplexing unit which demultiplexes light input from the optical transmission line and outputs the demultiplexed light to the optical switch, wherein the connection unit can be connected to both a single-core reception module and a two-core reception module as a reception module.

Description

[Technical field]

[0001] The present invention relates to a technique for optical transmission devices. [Background technology]

[0002] An optical communication device capable of relaying an optical signal according to the destination while reducing delay has been proposed (see, for example, Patent Document 1). As a configuration of an optical communication device related to Patent Document 1, a configuration example shown in FIG. 8 will be described.

[0003] FIG. 8 shows an optical switch (optical SW), a wavelength management control section, an optical SW control section, and upstream and downstream wavelength multiplexing / demultiplexing sections. The optical switch outputs input optical signals from one or more subscriber devices to a transmission path of one of the directions. The wavelength management control section dynamically allocates the wavelengths used by the subscriber devices. The optical SW control section controls the optical switch so that the optical signal from the subscriber device is transmitted to the transmission path of the desired direction. The wavelength multiplexing / demultiplexing section multiplexes multiple wavelengths or demultiplexes into multiple wavelengths.

[0004] The subscriber device shown in Fig. 8 also has an optical transceiver. The optical transceiver may be a wavelength-tunable optical transmitter / receiver, in which case communication can be performed at any wavelength. The optical transceiver may also be an optical transceiver with AMCC (Auxiliary Management and Control Channel) functionality, in which case the wavelength used can be controlled via a control signal superimposed by the AMCC. When the wavelength management and control unit performs control, the optical SW control unit changes the wiring of the optical SW so that the subscriber device and the wavelength management and control unit are connected.

[0005] Regarding the number of optical fibers, in relay, the upstream and downstream fibers are separate fibers and often use the same wavelength, so in the configuration example of Figure 8, the wavelength multiplexing and demultiplexing section is divided into upstream and downstream, so the number of optical fibers is the number corresponding to the number. Also, in the access section, the upstream and downstream are often separated into one core with different wavelengths. In this case, the optical signal from the one-core subscriber device needs to be converted to two cores. In the configuration example of Figure 8, the optical signal transmitted from the subscriber device through a single-core optical fiber is converted to two cores by a WDM filter, but the connection mode from the subscriber device is not limited to only a single-core optical fiber, and as shown in Figure 8, subscriber devices using two-core transceivers may be accommodated.

[0006] In the configuration example of Figure 8, first the subscriber device sends a control signal to the wavelength management and control unit, which then notifies it of the wavelength to be used. At this time, the upstream port can be identified by the presence or absence of optical power from the control signal, but the downstream port corresponding to the subscriber device cannot be found without prior information. For this reason, it is necessary to determine in advance which downstream port should be used for the upstream port of a certain subscriber device. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] International Publication No. 2021 / 131202 Summary of the Invention [Problem to be solved by the invention]

[0008] As shown in the configuration example of Figure 8, if the subscriber device is a single-core device, it is necessary to install a WDM filter, and wiring work between the optical switch and the WDM filter is required. As such, in the configuration example of Figure 8, the on-site work content differs for each subscriber device, which can easily cause confusion for on-site workers. In addition to installing the WDM filter and selecting a rack for that purpose, wiring work between racks may also be required depending on the installation location of the optical switch.

[0009] In addition, if optical switches, WDM filters, etc. are installed during the construction work process, and then it is discovered later during the service installation process that the subscriber equipment is in fact two-core, contrary to the information provided in advance, then it is necessary to remove all the installed WDM filters and optical fibers. In this way, the configuration example shown in Figure 8 cannot flexibly respond to changes from one core to two cores.

[0010] Furthermore, the upstream and downstream for one subscriber device must be inserted into predetermined ports, but in the configuration example shown in Figure 8, the upstream and downstream are selected from multiple ports (all ports of the optical switch), which can lead to wiring errors.

[0011] As described above, in the conventional technology, the work content was dependent on the subscriber device, and therefore the installation of WDM filters and wiring work were required, making it impossible to simplify the work.

[0012] In view of the above circumstances, an object of the present invention is to provide a technique that can simplify the work. [Means for solving the problem]

[0013] One aspect of the present invention is an optical transmission device comprising a connection unit connectable to perform optical communication with a storage module that stores an optical fiber, an optical switch that receives an optical signal from the connection unit and outputs an optical signal to the connection unit, an optical switch control unit that controls the optical switch, an upstream wavelength multiplexing / demultiplexing unit that multiplexes light of multiple wavelengths output from the optical switch and outputs it to a transmission path, and a downstream wavelength multiplexing / demultiplexing unit that demultiplexes light input from the transmission path and outputs it to the optical switch, wherein the connection unit is capable of connecting either a single-core storage module or a dual-core storage module as the storage module. Effect of the Invention

[0014] The present invention makes it possible to simplify the work. [Brief description of the drawings]

[0015] [Figure 1] 1 is a block diagram showing a configuration of an optical transmission system in a first embodiment. [Diagram 2] FIG. 1 is a diagram showing a configuration example of a single-core accommodating module. [Diagram 3] FIG. 13 is a diagram showing a configuration example of a two-core accommodating module. [Figure 4] FIG. 11 is a block diagram showing a configuration of an optical transmission system in a second embodiment. [Diagram 5] FIG. 13 is a block diagram showing a configuration of an optical transmission system in a third embodiment. [Figure 6] FIG. 1 is a diagram showing a configuration example of a single-core accommodating module. [Figure 7] FIG. 13 is a diagram showing a configuration example of a two-core accommodating module. [Figure 8] FIG. 1 is a diagram showing a conventional example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. (First embodiment) 1 is a block diagram showing a configuration of an optical transmission system 1 in the first embodiment. The optical transmission system 1 is composed of an optical transmission device 100, an accommodating module 200, and a subscriber device 300. The accommodating module 200 includes a single-core accommodating module 201 and a double-core accommodating module 202. The subscriber device 300 includes a single-core subscriber device 301 and a double-core subscriber device 302. The single-core accommodating module 201 is a module that connects to the single-core subscriber device 301 via optical fiber. The double-core accommodating module 202 is a module that connects to the double-core subscriber device 302 via optical fiber.

[0017] The optical transmission device 100 is composed of an upstream wavelength multiplexing / demultiplexing unit 111, a downstream wavelength multiplexing / demultiplexing unit 112, an upstream optical switch (SW) 141, a downstream optical switch (SW) 142, a wavelength management control unit 120, an optical switch (switch) control unit 130, LED (Light Emitting Diode) lamps 161, 162, 163, and connection units 151, 152, 153. When the connection units 151, 152, 153 are not distinguished from one another, they are referred to as connection unit 150. Instead of placing separate optical switches for the upstream and downstream, a configuration in which one optical SW accommodates the upstream and downstream may be used.

[0018] The wavelength management control unit 120 dynamically allocates the wavelengths used by the subscriber device 300. Specifically, when the subscriber device 300 starts communication, the wavelength management control unit 120 connects to the subscriber device 300 via the optical SW 141 or the optical SW 142, and dynamically allocates the wavelengths used by the subscriber device 300. The optical SW control unit 130 controls the optical SW 130 so that the optical signal from the subscriber device 300 is transmitted to a transmission line of a desired route. The wavelength multiplexing / demultiplexing unit 111 multiplexes light of multiple wavelengths output from the optical SW 141 and outputs it to the transmission line. The wavelength multiplexing / demultiplexing unit 112 demultiplexes light input from the transmission line and outputs it to the optical SW 142. The optical SW 141 switches the path of the optical signal from the subscriber device 300 under the control of the optical SW control unit 130, and outputs it to the wavelength multiplexing / demultiplexing unit 111. The optical SW 142 switches the path of the optical signal from the wavelength multiplexing / demultiplexing unit 111 under the control of the optical SW control unit 130, and outputs it to the subscriber device 300. Note that the wavelength and path that each subscriber device 300 uses for communication may be determined by another device that monitors the entire network, and instructions may be issued to the wavelength management control unit 120 and the optical SW control unit 130. In this case, a port for connection to the other device is provided in the optical transmission device 100.

[0019] The connection unit 150 can connect the accommodating module 200 to the optical transmission device 100 so as to perform optical communication. A plurality of connection units 150 (three connection units 151, 152, and 153 in this embodiment) are provided in the optical transmission device 100. The connection unit 150 can connect both the one-core accommodating module 201 and the two-core accommodating module 202 to the optical transmission device 100 so as to perform optical communication. The connection unit 150 is, for example, a socket into which the accommodating module 200 can be inserted and removed.

[0020] Each connection unit 150 is provided with two ports. In this embodiment, a port refers to a hole through which an optical fiber passes. One port is a port for an upstream optical fiber, and the other port is a port for a downstream optical fiber. The optical fiber that passes through the port for the upstream optical fiber is connected to an optical SW 141. The optical fiber that passes through the port for the downstream optical fiber is connected to an optical SW 142.

[0021] In the case of a device that connects with one core, such as the subscriber device 301, a one-core accommodating module 201 is connected to the connection unit 150. In the case of a device that connects with two cores, such as the subscriber device 302, a two-core accommodating module 202 is connected to the connection unit 150.

[0022] The LED lamps 161, 162, and 163 are provided corresponding to the connection parts 151, 152, and 153, respectively. The LED lamps 161, 162, and 163 are an example of an identification part capable of identifying the connection part 150 to which the accommodation module 200 for connecting optical fibers is connected. The LED lamps 161, 162, and 163 are connected to an LED remote control device 170. The LED remote control device 170 can remotely control the states (on, off, blinking, etc.) of the LED lamps 161, 162, and 163. When a plurality of accommodation modules 200 are connected to the optical transmission device 100 during opening work, the LED lamps 161, 162, and 163 identify which accommodation module 200 the worker should connect to.

[0023] For example, an LED corresponding to the connection unit 150 to which the accommodating module 200 that connects optical fibers by remote control is connected is turned on by the LED remote control device 170. As an example, when connecting an optical fiber to the accommodating module 200 connected to the connection unit 151, the LED 161 is turned on. This allows the worker to check in front of the housing of the optical transmission device 100, and the worker can perform the work without having difficulty in determining which accommodating module 200 to connect to.

[0024] 2 is a diagram showing a configuration example of a module 201 for accommodating one core. The module 201 for accommodating one core includes a 1-2 core conversion unit 211. The 1-2 core conversion unit 211 converts one core to two cores and two cores to one core. The 1-2 core conversion unit 211 is, for example, a WDM filter or a circulator. FIG. 3 is a diagram showing a configuration example of a module 202 for accommodating two cores. The module 202 for accommodating two cores is simply a connection unit between an optical fiber from a subscriber device 302 and the optical transmission device 100, and does not include any special functions.

[0025] In this way, whether the subscriber device 300 has one core or two cores, the connection work between the optical transmission device 100 and the subscriber device 300 is simplified by connecting the accommodating module 200 to the optical transmission device 100 and connecting the optical fiber from the subscriber device 300. Also, since it is only necessary to connect the accommodating module 200 to the optical transmission device 100, the amount of work is reduced compared to the installation of WDM filters and fiber wiring work at the work site.

[0026] In addition, since the optical fiber from the subscriber device 300 is not directly connected to the optical transmission device 100, the mistake of an operator connecting the optical fiber to the optical transmission device 100 without going through the accommodating module 200 can be prevented.

[0027] Second embodiment Next, a configuration example will be described in which the connection unit 150 can directly connect optical fibers without going through the accommodating module 200. In the following description, explanations of the previously mentioned symbols will be omitted. Fig. 4 is a block diagram showing the configuration of the optical transmission system 1 in the second embodiment.

[0028] The connection unit 150 is capable of connecting a single-core accommodating module 201 and is further configured to be capable of directly connecting an optical fiber. As shown in FIG. 4, an optical fiber from a two-core subscriber device 302 is directly connected to the connection unit 152.

[0029] According to the second embodiment, although there is a difference whether or not the accommodating module 200 is connected, compared to the conventional technology, there is no need to install a WDM filter or perform fiber wiring work at the work site. Moreover, since the connection work of the optical fiber and the accommodating module 200 is all performed in front of the housing of the optical transmission device 100, the work can be simplified in the second embodiment as well.

[0030] Third embodiment Next, a configuration example will be described in which the connection unit 150 is connected to the accommodating module 200 through one port. In the following description, the explanation of the already mentioned reference numerals will be omitted. Fig. 5 is a block diagram showing the configuration of the optical transmission system 1 in the third embodiment.

[0031] In the first and second embodiments, the connection unit 150 is connected to the accommodating module 200 through two ports, but in the third embodiment, as shown in Fig. 5, it is connected to the accommodating module 200 through one port. And, two optical fibers pass from the one port to the optical switches 141 and 142. The configuration of the accommodating module 200 in this case will be described.

[0032] Fig. 6 is a diagram showing a configuration example of a module 201 for accommodating one core. The module 201 for accommodating one core includes a 1-2 core conversion unit 211. The 1-2 core conversion unit 211 converts one core to two cores and two cores to one core. The 1-2 core conversion unit 211 is, for example, a WDM filter or a circulator. Fig. 7 is a diagram showing a configuration example of a module 202 for accommodating two cores. The module 202 for accommodating two cores is simply a connection unit between the optical fiber from the subscriber device 302 and the optical transmission device 100, and does not include any special functions.

[0033] In this way, whether the subscriber device 300 has one core or two cores, the connection work between the optical transmission device 100 and the subscriber device 300 is simplified by connecting the accommodating module 200 to the optical transmission device 100 and connecting the optical fiber from the subscriber device 300. Also, since it is only necessary to connect the accommodating module 200 to the optical transmission device 100, the amount of work is reduced compared to the installation of WDM filters and fiber wiring work at the work site.

[0034] Furthermore, by making the connection unit 150 a single port, the number of ports required for the optical transmission device 100 can be reduced, and therefore the housing size of the optical transmission device 100 can be slimmer than in the case of two ports. Furthermore, compared to the case of two ports, the number of parts of the optical transmission device 100 can be reduced, and the manufacturing man-hours can also be reduced, so that the cost of the optical transmission device 100 can be reduced.

[0035] Furthermore, in the third embodiment, since the optical fiber from the subscriber device 300 is not directly connected to the optical transmission device 100, it is possible to prevent a worker from making a mistake of connecting the optical fiber to the optical transmission device 100 without going through the accommodating module 200.

[0036] Although an embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and designs that do not deviate from the gist of the present invention are also included. [Industrial Applicability]

[0037] The present invention is applicable to optical transmission devices that perform transmission over optical fiber transmission lines. [Explanation of symbols]

[0038] 1...Optical transmission system 100...Optical transmission device 111...Wavelength multiplexing / demultiplexing section 111, 112...Upstream wavelength multiplexer / demultiplexer 120... Wavelength management control unit 130...Optical switch control unit 150, 151, 152, 153...Connections 200…Containment module 201...1-core housing module 202...2-core housing module 211...1-2 core conversion section 300, 301, 302…Subscriber equipment

Claims

1. a connection part connectable to an accommodation module that accommodates an optical fiber so as to perform optical communication; an optical switch that receives an optical signal from the connection portion and outputs an optical signal to the connection portion; an optical switch control unit for controlling the optical switch; an upstream wavelength multiplexing / demultiplexing unit that multiplexes light of a plurality of wavelengths output from the optical switch and outputs the multiplexed light to a transmission line; a downstream wavelength multiplexing / demultiplexing unit that demultiplexes light input from a transmission line and outputs the demultiplexed light to the optical switch; Equipped with The optical transmission device, wherein the connection section is capable of connecting either a one-core accommodating module or a two-core accommodating module as the accommodating module.

2. 2. The optical transmission device according to claim 1, wherein the connection section is capable of directly connecting an optical fiber without passing through the accommodation module.

3. The optical transmission device according to claim 1 , wherein the connection section is connected to the accommodation module through one port.

4. 4. The optical transmission device according to claim 1, further comprising a wavelength management control unit that dynamically allocates wavelengths to be used by communication destinations connected via the accommodating modules.

5. A plurality of said connection portions are provided, The optical transmission device according to claim 1 , further comprising an identification unit capable of identifying the connection unit to which the accommodation module for connecting optical fibers is connected, among the plurality of connection units.

6. The optical transmission device according to claim 5 , wherein the specifying unit is an LED lamp, and the state of the LED lamp can be remotely controlled.

7. a connection part connectable to an accommodation module that accommodates an optical fiber so as to perform optical communication; an optical switch that receives an optical signal from the connection portion and outputs an optical signal to the connection portion; an upstream wavelength multiplexing / demultiplexing unit that multiplexes light of a plurality of wavelengths output from the optical switch and outputs the multiplexed light to a transmission line; a downstream wavelength multiplexing / demultiplexing unit that demultiplexes light input from a transmission line and outputs the demultiplexed light to the optical switch; Equipped with The optical transmission device, wherein the connection section is capable of connecting either a one-core accommodating module or a two-core accommodating module as the accommodating module.

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