WO2005036784A1

WO2005036784A1 - Expandable wavlength division multiplex transmitter

Info

Publication number: WO2005036784A1
Application number: PCT/JP2003/012829
Authority: WO
Inventors: Nobuyuki Kaji
Original assignee: Allied Telesis K.K.
Priority date: 2003-10-07
Filing date: 2003-10-07
Publication date: 2005-04-21
Also published as: AU2003268782A1; JPWO2005036784A1

Abstract

A WDM transmitter in which variation in the system configuration can be dealt with flexibly, expandability and operability are enhanced, and effective utilization of network resources can be achieved. A signal light passed through an uplink module (101) having a WDM port (102) and a stacking port (103) enters the post-stage WDM transmitter through the stacking port (103) and a signal light from the post-stage is received through the stacking port (103). Internal condition of the WDM transmitter is monitored remotely by a management module (104). Furthermore, a link test button (115) for transmitting a link test signal from the WDM port (102) is provided.

Description

Description Scalable wavelength division multiplex transmission equipment

The present invention relates to a wavelength division multiplexing (hereinafter referred to as WDM) transmission device that enables high-speed transmission over long distances by wavelength multiplexing a plurality of channels, and more particularly to a plurality of low power reports and at least one The present invention relates to a WDM transmission device having two remote ports and a WDM transmission device system using the same. Background art

In recent years, various WDM transmission devices have been provided that enable long-distance transmission by wavelength-multiplexing a plurality of gigabit Ethernets (Ethernet is a registered trademark, the same applies hereinafter) to single-mode optical fibers. For example, there is a WDM transmission device currently on the market that is capable of transmitting up to 20 Gbps / 2 cores (Full Duplex) by connecting eight Gigabit Ethernets. Such a WDM transmission device is an indispensable communication device such as a J バンド c LAN local-area network; and a fiber-to-the-home (FTTTH) network for building a future broadband network.

Japanese Patent Laying-Open No. 11-095060 (hereinafter referred to as Patent Document 1) discloses a cascade-type optical multiplexing device as an example of an optical division multiplexing transmission device. In this conventional WDM transmission device, all channels are separated and multiplexed by cascading optical blocks capable of wavelength separation and multiplexing. For example, when 8-channel WDM light is input to a remote port, one optical block sequentially separates channels 1 to 4 of the 8-channel WDM light, and the remaining channels 5 to 8 are cascaded. In another optical block Separated. Conversely, optical signals of eight channels are sequentially multiplexed through these optical blocks and sent out from the remote port as wavelength-multiplexed light (paragraphs 0, 24, 27, 1, 8, and 9).

However, conventional WDM transmission equipment accommodates four or eight channels in one equipment housing. For this reason, if the same number of LANs are connected, resources can be used efficiently, but only one or two LANs can be connected depending on the scale of the LAN, installation location, company circumstances, etc. In such cases, resources cannot be used effectively.

In other words, if there are local ports that are not connected, the characteristics of high-speed large-capacity transmission of WDM cannot be fully utilized. Conversely, if the situation changed and six channels were needed, although initially thought that a four-channel WDM transmission device was sufficient, in this example, a new eight-channel WDM transmission device was purchased and replaced. There is a need. The need to replace such transmission devices impairs the flexibility of the WDM transmission system, not only increases the cost, but also reduces the cost because two out of eight channels are not used. There is waste. Also in the WDM transmission device described in Patent Document 1, it is assumed that optical blocks are cascaded in one housing to perform channel separation and multiplexing, and the same problem occurs.

Therefore, an object of the present invention is to provide a WDM transmission device that can flexibly cope with changes in the system configuration, improve scalability and operability, and achieve effective use of network resources. It is to provide a transmission system. Disclosure of the invention

According to a first aspect of the present invention, a wavelength division multiplexing / demultiplexing apparatus optically connects to a remote port, performs multiplexing and demultiplexing of light of a predetermined wavelength, and performs signal light of another wavelength An optical multiplexing / demultiplexing means for passing the signal light; It is characterized by having.

Preferably, the apparatus further comprises monitoring means for remotely monitoring an internal state of the wavelength division multiplexing transmission device.

Further, according to the present invention, it is characterized by further comprising: link test means for transmitting a link test signal from the remote port; and a link test button for activating the link test means.

According to a second aspect of the present invention, in a system including at least a first wavelength division multiplexing / demultiplexing transmission device and a second wavelength division multiplexing / transmission device, the first wavelength division multiplexing / demultiplexing device comprises: Optically connected to the first remote port and the first remote port, and multiplexes and demultiplexes the light of the first wavelength group, and outputs the light of the second wavelength group other than the first wavelength group. A first optical multiplexing / demultiplexing means, which is optically connected to the first optical multiplexing / demultiplexing means, emits the signal light passing through the first optical multiplexing / demultiplexing means, and receives the signal light from outside A second stacking port for optically connecting to a plurality of second local ports, a second remote port, and the second remote port. Second light for multiplexing and demultiplexing the light of the second wavelength group Multiplexing / demultiplexing means, wherein the first stacking port of the first wavelength division demultiplexing transmission device and the second remote port of the second wavelength division demultiplexing transmission device are optically connected by an optical cable. It is characterized by being connected.

Similarly, the apparatus includes a third wavelength division multiplexing / demultiplexing transmission device and a fourth wavelength division multiplexing / demultiplexing transmission device. 3 optically connected to a remote port, multiplexes and demultiplexes light of a third wavelength group, and third optical multiplexing / demultiplexing means for passing light of a fourth wavelength group other than the third wavelength group; Optically connected to third optical multiplexing / demultiplexing means, A second stacking port for emitting the signal light having passed through the means to the outside and receiving the signal light from the outside, and wherein the fourth wavelength division multiplexing / transmission apparatus includes a plurality of fourth local ports; A fourth remote port; and a fourth optical multiplexing / demultiplexing unit optically connected to the fourth remote port to multiplex and demultiplex the light of the fourth wavelength group. Optically connecting the second stacking port of the demultiplexing transmission device and the fourth remote port of the fourth wavelength division multiplexing transmission device by an optical cable; and further comprising the first to fourth wavelength division demultiplexing transmission devices. And a monitoring means for remotely monitoring the internal state of each of the above.

As described above, according to the present invention, by providing a stacking port optically connected to the remote port in addition to the remote port, another WDM transmission device can be cascaded, The number of local ports accommodated can be easily expanded. Furthermore, it is possible to connect the remote port and the stacking port to separate WDM transmission devices, respectively, and the scalability and flexibility of the system configuration can be greatly improved. Brief Description of Drawings

FIG. 1 is a perspective view of a cascaded WDM transmission device system according to an embodiment of the present invention.

FIG. 2 is a schematic block diagram showing an internal circuit of the WDM transmission device system shown in FIG.

FIG. 3 is a diagram showing another connection form using the WDM transmission device according to the present embodiment.

FIG. 4A is a schematic system configuration diagram for explaining a loopback test operation when a system using the WDM transmission device according to the present embodiment is constructed. FIG. 4B is a schematic system configuration diagram for explaining the loop pack test operation from the SNMP manager. FIG. 5A is a configuration diagram of a WDM transmission system for explaining a mixing link function when a local port is disconnected.

FIG. 5B is a configuration diagram of the WDM transmission system for explaining the missing link function when the remote port is disconnected.

FIG. 6 is a network configuration diagram showing an example of a WDM transmission network using the WDM transmission device according to the present invention.

FIG. 7 is a network configuration diagram showing another example of the WDM transmission network using the WDM transmission device according to the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

In FIG. 1, a WDM transmission device 1 according to an embodiment of the present invention can function as one WDM transmission device by cascading another WDM transmission device 2. The difference between the WDM transmission device 1 and the second WDM transmission device 2 has a module configuration, and as described later, the uplink module 101 or the uplink module 201, the management module 104, or the management Modules 203 can be selectively installed. Here, it is assumed that the uplink module 101 and the management module 104 are attached to the WDM transmission apparatus 1, and the uplink module 201 and the management module 203 are attached to the WDM transmission apparatus 2. I do.

In the WDM transmission device 1, the uplink module 101 has a WDM port 102 as a remote port (RP) and a stacking port (SP) 103 for cascade connection. The management module 104 is a module for managing SNMP (Simple Network Management Protocol), and has an SNMP connection port 105 and stacking ports 106 and 109 for SNMP. The S NMP connection port 105 is connected to the S NMP manager via a network such as Ethernet, for example. Etc. can be monitored remotely. Further, the WDM transmission device 1 has two local ports 107 and 108, and here, both are optical transceiver modules that are compatible with GBIC (Gigabit Interface Converter).

In the WDM transmission device 2, the uplink module 201 has a WDM port 202 which is a remote port (RP). The management module 203 is an SMP management module, and has an SNMP connection port 204 and a stacking port 205. Further, the WDM transmission apparatus 2 is also provided with two local ports 206 and 207, each of which is composed of an optical transceiver module compatible with GBIC.

According to the present embodiment, the WDM port 102 of the WDM transmission device 1 is connected to the single mode optical fiber cable 301, and the stacking port 103 is connected to the WDM port 202 of the WDM transmission device 2. Are connected through an optical fiber cable 302. Further, the SNMP stacking port 106 of the management module 104 is connected to the SNMP connection port 204 of the WDM transmission device 2 through an optical fiber cable 303.

By cascading in this way, the uplink module 101 and the uplink module ^ / 201 function as one uplink module, and the management module 104 and the management module 203 also transmit WDM. Functions as one management module that manages devices 1 and 2. Therefore, by simply cascading a WDM transmission device 2 containing two GBIC ports to a WDM transmission device 1 containing two GBIC ports, it can be upgraded to a WDM transmission device containing four GBIC ports. can do.

Although not shown in FIG. 1, WDM transmission apparatuses 1 and 2 are provided with link test buttons for starting a loopback test. FIG. 2 is a schematic diagram showing the internal circuit of the WDM transmission system shown in FIG. FIG. The components described in FIG. 1 are denoted by the same reference numerals.

In FIG. 2, the uplink module 101 of the WDM transmission device 1 has multiplexers / demultiplexers 110 and 111. The multiplexer / demultiplexer ₁₁₀ separates an optical signal of a specific wavelength ( _iR11 ) from the wavelength multiplexed light received through the WDM port ₁₀₂ , reflects another wavelength light, and furthermore, reflects the specific wavelength (λ The transmission light of _τ11 ) is multiplexed and transmitted to the WDM port ₁₀₂ . Similarly, the multiplexer / demultiplexer ₁₁₁ separates an optical signal of a specific wavelength ( _R12 ) from the wavelength-division multiplexed light that has passed through the multiplexer / demultiplexer 110, reflects other wavelengths of light, and reflects the specific wavelength. The transmission light of (λ _τ12 ) is multiplexed and transmitted to the WDM port ₁₀₂ . The wavelength division multiplexed light that has passed through the multiplexer / demultiplexer 110 and 111 is sent to another WDM transmission device 2 through the stacking port 103 and the optical cable 302. The separated received light is transferred to the low-power port 107 through the physical layer device 112. The transmission light received from the gigabit LAN at the local port 107 is multiplexed by the multiplexer / demultiplexer 110 through the physical layer device 112 and transmitted from the WDM port 102. Similarly, the received light separated by the multiplexer / demultiplexer 111 is transferred to the local port 108 through the physical layer device 112. The transmission light received at the local port 108 is multiplexed by the multiplexer / demultiplexer 111 through the physical layer device 113, and transmitted from the WDM port 102.

Further, the WDM transmission apparatus 1 is provided with a control unit 114, a link test button 115, and an LED (light emitting diode) 116 serving as an indicator. The control unit 114 includes a physical layer device 112 and a physical layer device 112. In addition to controlling 113, it collects necessary information (link status, power status, etc.) according to the instruction from the management module 104, and returns it to the management module 104. As will be described later, the link test buttons 115 are provided for performing a link test when a WDM communication system is constructed.

Uplink module 201 of WDM transmission equipment 2 has different transmission and reception wavelengths. It has the same configuration as the uplink module 101 except that the stacking port 103 is not provided. Further, physical layer devices 210 and 211 similar to the WDM transmission device 1 and local ports 206 and 207 are provided. Further, in the WDM transmission apparatus 2, similarly, a control unit 212, a link test button 213, and an LED 214 as an indicator are provided, and the control unit 212 controls the physical layer devices 210 and 211 and also manages the management module 203. Collects necessary information (link status, power status, etc.) and returns it to the management module 203 in response to an instruction from.

The management module 104 mounted on the WDM transmission device 1 is connected to the management module 203 of the WDM transmission device 2 via a cable 303, and further connected to an SNMP manager via a network. The SNMP manager can monitor the status of WDM transmission devices 1 and 2 through the network.

As a specific example, in the uplink module 101, the reception wavelength; l _R11 = 1290 nm, the transmission wavelength; L _T11 = 1310 nm, the reception wavelength; l _R12 = 1330 nm, the transmission wavelength; l _T12 = 1350 nm . In the uplink module 201, the reception wavelength X _R11 = 1510 nm, the transmission wavelength λ _τ11 = 1530 nm, the reception wavelength; L _R12 = 1570 nm, the transmission wavelength; l _T12 = 1550 nm. Also, as the uplink modules 101 and 201, required modules can be selected from modules having different transmission distances (for example, 50 km, 80 km, 120 km, etc.).

FIG. 3 is a diagram showing another connection form using the WDM transmission device according to the present embodiment. Here, four WDM transmission devices 1, 2, 3 and 4 are used, and WDM transmission devices 1 and 2 are cascaded by an optical cable 302 as shown in FIG. 1, and WDM transmission devices 3 and 4 are similarly cascaded. Connected. That is, the stacking port 103.3 of the WDM transmission device 3 and the WDM port 202.4 of the WDM transmission device 4 are connected by the optical cable 302.3. The SNMP stacking port 106 of the management module 104 is connected to the SNMP connection port 204 of the WDM transmission device 2 via a cable 303. Similarly, the SNMP stacking port 106.3 of the WDM transmission device 3 is connected to the WD It is connected to SNMP connection port 204.4 of M transmission device 4 via cable 303.3. Further, the SNMP connection port 105.3 of the WDM transmission device 3 is connected to the SNMP stacking port 109 of the WDM transmission device 1 through a cable 305.

With this connection, as described above, the uplink modules 101 and 201 function as one uplink module, and similarly, the uplink modules 101.3 and 201.4 also have one uplink module. Functions as a file. Further, the management modules 104, 203, 104.3, and 203.4 can also function as management modules for managing the WDM transmission devices 1 to 4, respectively. Therefore, the SNMP manager can monitor the status of the WDM transmission devices 1-4 through the network. In this way, by connecting four WDM transmission devices accommodating two GBIC ports, it is possible to upgrade to a WDM transmission device accommodating eight GBIC ports.

(Link test function)

In the WDM transmission system shown in FIG. 4A, a WDM transmission device 401 according to the present embodiment is connected to a WDM transmission device 402 through an optical fiber cable 403. The WDM transmission device 401 in this example may have the link test button in the present embodiment, and may be either the WDM transmission device 1 or the WDM transmission device 2 in FIG. 2, but here, the configuration of the WDM transmission device 1 It shall have.

First, when the optical fiber cable 403 is attached to the WDM port of the WDM transmission device 401 and the connection of the system is completed, the system builder sets the WDM transmission device 4 0 Press the 1 link test button 1 1 5. When detecting that the link test button 115 is pressed, the control unit 114 controls the physical layer device 112 or 113 to generate an optical signal of a predetermined wavelength for link test. The generated test signal is sent from the "WDM port 102" of the uplink module 101 to the optical fiber cable 403, and to the partner WDM transmission device 402 as long as the cable 403 is normal. The received test signal is looped back by the physical layer device of the WDM transmission device 402 and returned to the original WDM transmission device 401. The returned test signal is transmitted by the physical layer device 112. Upon reception, the control unit 114 lights the LED indicator indicating the link to notify the installer that the link is normal, thus confirming the normality of the link when the system is installed.

In the WDM transmission system shown in FIG. 4B, the WDM ports of the WDM transmission devices 1 and 2 shown in FIGS. 1 and 2 are separately connected to the optical fiber cables 404 and 405, respectively, and the management modules 104 and 203 is connected by cable 303. The S NMP manager 407 controls the management modules 104 and 203 of the WDM transmission devices 1 and 2 via the switch 406, and performs the above-described loopback test on the optical fiber cables 404 and 4. Perform each through 0-5. In this way, after the system operates, the SNMP manager 407 can perform a loop pack test and periodically monitor the link status.

(Missing function)

In FIG. 5A, when the local port LP2 of the WDM transmission device 401 and the local port LP3 of the WDM transmission device 402 are communicating, the transmission line of the local port LP2 is disconnected. I do. When detecting the disconnection of the transmission line of the local port LP2, the physical layer device P HY corresponding to the local port LP2 disconnects the link of the corresponding WDM transmission wavelength. This allows the corresponding The physical layer device P HY of the WDM transmission device 402 that has received the optical signal of the transmission wavelength disables the output of the corresponding local port LP 3. In this way, the receiving side can know the occurrence of the link disconnection on the transmitting side.

In FIG. 5B, when the optical fiber cable between the WDM transmission device 401 and the WDM transmission device 402 is cut, as described above, the WDM transmission device 401 and the WDM transmission device 402 become disconnected. The physical layer device P HY corresponding to each local port activates the mixing link function and disables the output of the corresponding local port.

(Example of network connection)

FIG. 6 is a network configuration diagram showing an example of a WDM transmission network using the WDM transmission device according to the present invention. Here, of the WDM transmission devices 601 to 604, the WDM transmission devices 601 and 602 are under common management, and the remote port (RP) of the WDM transmission device 601 is The remote port of WDM transmission device 603 is connected by an optical fiber cable, and the remote port (RP) of WDM transmission device 602 is connected to the remote port of WDM transmission device 604 by an optical fiber cable. .

In the WDM transmission apparatuses 600 and 602, the WDM ports of the WDM transmission apparatuses 1 and 2 shown in FIGS. 1 and 2 are individually connected to optical fiber cables, respectively. 203 is connected by a cable 303. That is, the management modules of the WDM transmission apparatuses 61 and 60 · 2 are controlled via the layer 3 switch.

FIG. 7 is a network configuration diagram showing another example of a WDM transmission network using the WDM transmission device according to the present invention. Here, of the WDM transmission apparatuses 71 1 to 704, the WDM transmission apparatuses 701 and 702 are cascade-connected in the same manner as the WDM transmission apparatuses 1 and 2 shown in FIGS. That is, the remote port PR of the WDM transmission device 702 is The management modules 104 and 203 are connected by a cable 303 and managed via a layer 3 switch. The WDM transmission device 703 has the same configuration as the WDM transmission device 1 in FIGS. 1 and 2, and the remote port (RP) of the WDM transmission device 701 is connected to the remote port of the WDM transmission device 703 by an optical port. Connected by fiber cable. Further, a stacking port (SP) of the WDM transmission device 703 is connected to a remote port of the WDM transmission device 704 by an optical fiber cable.

As described above, the WDM transmission apparatus according to the present embodiment has a stacking port that enables a stack connection in addition to the remote port, so that the local WDM transmission apparatus can be easily connected to another WDM transmission apparatus by cascading. The number of ports accommodated can be expanded. Furthermore, it is also possible to connect the remote port and the stacking port to separate WDM transmission devices, respectively, which can greatly improve the expandability and flexibility of the system configuration.

Claims

The scope of the claims

1. A wavelength division multiplexing / demultiplexing apparatus having a plurality of local ports and at least one remote port,

Optical multiplexing / demultiplexing means for optically connecting to the remote port, multiplexing and demultiplexing light of a predetermined wavelength, and passing signal light of other wavelengths;

A stacking port that is optically connected to the optical multiplexing / demultiplexing means, emits the signal light passing through the optical multiplexing / demultiplexing means, and receives the signal light from the outside. Demultiplexing transmission equipment.

2. The wavelength division multiplexing / transmission apparatus according to claim 1, further comprising a monitoring means for remotely monitoring the internal state of the wavelength division multiplexing / transmission apparatus.

3. Link test means for transmitting a link test signal from the remote port;

A link test button for activating the link test means,

2. The wavelength division multiplexing transmission apparatus according to claim 1, further comprising:

4. The wavelength multiplexing apparatus according to claim 1, wherein the remote port, the optical multiplexing / demultiplexing means, and the stacking port are provided on a module detachably attached to the wavelength division multiplexing / demultiplexing transmission apparatus. Separate transmission equipment.

5. The wavelength division multiplex transmission device according to claim 2, wherein the monitoring means is provided on a module detachably attached to the wavelength division multiplex transmission device.

6. In a system including at least the first wavelength division multiplexing transmission device and the second wavelength division multiplexing transmission device,

The first wavelength division multiplexing transmission device,

Multiple first local ports,

The first remote port, First optical multiplexing / demultiplexing means for optically connecting to the first remote port, multiplexing and demultiplexing light of a first wavelength group, and passing light of a second wavelength group other than the first wavelength group; ,

A first stacking port that is optically connected to the first optical multiplexing / demultiplexing means, emits signal light that has passed through the first optical multiplexing / demultiplexing means, and receives signal light from outside;

Has,

The second wavelength division multiplexing / demultiplexing device,

Multiple second local ports,

A second remote port,

A second optical multiplexing / demultiplexing unit optically connected to the second remote port and multiplexing and demultiplexing the light of the second wavelength group;

Has,

The wavelength division multiplexing / demultiplexing transmission system characterized in that the first stacking port of the first wavelength division multiplexing / demultiplexing transmission device and the second remote port of the second wavelength division multiplexing / demultiplexing transmission device are optically connected by an optical cable. Equipment system.

7. The wavelength division multiplexing / demultiplexing device according to claim 6, further comprising first monitoring means for remotely monitoring an internal state of each of the first wavelength division multiplexing / transmission device and the second wavelength division multiplexing / transmission device. Transmission equipment system.

8. It further has a third wavelength division multiplexing / demultiplexing transmission device and a fourth wavelength division multiplexing / demultiplexing transmission device,

The third wavelength division multiplexing / demultiplexing device,

A plurality of third mouth calports,

A third remote port,

A third optical multiplexer / demultiplexer optically connected to the third remote port, multiplexes / demultiplexes light of a third wavelength group, and passes light of a fourth wavelength group other than the third wavelength group. Means,

A second stacking port that is optically connected to the third optical multiplexing / demultiplexing means, emits signal light that has passed through the third optical multiplexing / demultiplexing means, and receives signal light from outside;

Has,

The fourth wavelength division multiplexing transmission device,

A number of fourth mouth calports,

A fourth remote port,

Fourth optical multiplexing / demultiplexing means which is optically connected to the fourth remote port and multiplexes and demultiplexes the light of the fourth wavelength group;

Has,

Optically connecting the second stacking port of the third wavelength multiplexing / demultiplexing device and the fourth remote port of the fourth wavelength multiplexing / demultiplexing device by an optical cable;

A second monitoring unit for remotely monitoring the internal state of each of the third wavelength division multiplexing / transmission apparatus and the fourth wavelength division multiplexing / transmission apparatus, and being connected to the first monitoring means. 7. The wavelength multiplexing / demultiplexing transmission system according to claim 6, wherein: