CN1467930A - An optical fiber ring network system and its optical add-drop multiplexing module and its upgrading and expansion method - Google Patents

Abstract

An optical fiber ring network system, comprising at least one group of bidirectionally transmitted optical fiber ring chains, a plurality of optical add-drop multiplexing nodes arranged in the optical fiber ring chains, and a plurality of synchronous digital serial devices connected to the optical fiber ring chains, characterized in Each optical add-drop multiplexing node is composed of two optical add-drop multiplexing modules connected in series, and the upwave port and downwave port of each optical add-drop multiplexing module are respectively connected to the main The receiving end and the sending end of the channel or backup channel are connected independently. Since the present invention adopts the structure of the optical add-drop multiplexing module with up-wave and down-wave pass-through ports, and uses the up-wave and down-wave pass-through ports as upgrade expansion ports to realize the serial connection between adjacent optical add-drop multiplex modules, it is very easy It well solves the problem of service interruption when the dual-fiber or four-fiber multiplex section protection switching ring is upgraded and expanded.

Description

An optical fiber ring network system and its optical add-drop multiplexing module and its upgrading and expansion method

technical field

The invention belongs to the technical field of optical communication, and in particular relates to an optical fiber ring network structure and an optical fiber ring network structure of a synchronous digital series (SDH) device connected in a metropolitan area wavelength division system when dual-fiber or four-fiber multiplexing section protection is used to switch the ring network. An add-drop multiplexing module (OADM) and an upgrade and expansion method thereof.

Background technique

In the current dual-fiber or four-fiber ring optical network structure, a large number of OADM nodes are used for optical add-drop multiplexing of services. The upwave port and downwave port connected to SDH equipment, ATM equipment or router, the multi-wavelength signal input port and output port connected to the optical fiber ring network, wherein the output end of the downwave part is connected in series with the input end of the upwave part, and The through ports of the wave-up part and the wave-down part are not led out. In the process of realizing dual-fiber ring network protection, since uploading and downloading services are required in both directions, two ADM units must be used in an OADM node, as shown in Figure 2, where the first OADM unit is used for West downwave and east upwave, and at the same time pass through the optical signals that do not need to be uploaded or downloaded at this station from west to east; the second OADM unit is used for east downwave and west upwave, and at the same time transmits Optical signals that do not need to be uploaded or downloaded are passed through from east to west. In the dual-fiber ring network structure, its connection structure is shown in Figure 3, and two different loops of the dual-fiber ring pass through two independent OADM units respectively. In the process of realizing the protection of the four-fiber ring network, the connection mode of the OADM unit is similar to that in the dual-fiber ring network, except that the number of OADM units is twice that of the dual-fiber ring network. The connection structure is shown in Figure 4. In the above two connection structures, the two different loops of the dual-fiber ring pass through two independent OADM units respectively; the four different loops of the four-fiber ring pass through four independent OADM units respectively. When using OADM units with this structure for series upgrade and expansion, you can only disconnect the input or output port of the OADM on the link, and connect the input port of another OADM with different wavelengths to the output port of the existing OADM or connect the In addition, the output ports of OADMs with different wavelengths are connected in series to the input ports of existing OADMs. Therefore, in this connection structure of network nodes, for a dual-fiber or four-fiber ring network, as long as one of the OADM units fails or is connected in series Upgrading and expansion will lead to service interruption of SDH dual-fiber or four-fiber multiplex section protection switching ring. Therefore, one of the biggest disadvantages of using the usual OADM unit connection method in a dual-fiber or four-fiber ring network is that for WDM equipment, if the optical layer protection is not provided, and the access WDM equipment uses dual-fiber or four-fiber multiplexing The SDH equipment of the segment protection switching ring, then when any OADM unit in Figure 2 is damaged, replaced, or undergoes series upgrade and expansion, it will cause service interruption on the SDH dual-fiber or four-fiber multiplex segment protection switching ring. Moreover, when using the usual OADM connection structure for upgrading and expansion, it will affect the existing insertion loss of the upper and lower waves, which is not conducive to the power budget of the entire network system, and the insertion loss of the upper and lower waves during the upgrade and expansion is also will increase.

Contents of the invention

The purpose of the present invention is to solve the above existing problems, to provide a dual-fiber or four-fiber ring network metropolitan area wavelength division system to upgrade and expand or replace the OADM unit without interrupting the dual-fiber or four-fiber multiplex section protection switching ring SDH business, and when upgrading and expanding the wavelength division equipment, the power budget of the wavelength already carrying the business is not affected, and the optical fiber ring network system and its optical division multiplexing are made to make the insertion loss of the uplink and downwave of the OADM node smaller Module and its upgrade and expansion method.

Technical scheme of the present invention is realized like this:

On the one hand, an optical fiber ring network system includes at least one group of optical fiber ring chains for bidirectional transmission, a plurality of optical add-drop multiplexing nodes arranged in the optical fiber ring chains, and a plurality of synchronous digital serial devices connected to the optical fiber ring chains , which is characterized in that each OADM node is composed of two OADM modules connected in series, wherein the downwave part of the first OADM module passes through the output port and the second OADM module The wave adding part of the module is connected through the input port, and the input port of the first optical add-drop multiplexing module and the output port of the second optical add-drop multiplexing module are respectively connected to the westward optical fiber ring chain, and the second optical add-drop multiplexing module The pass-through output port of the lower wave part of the module is connected to the pass-through input port of the upper wave part of the first optical add-drop multiplexing module, and the input port of the second optical add-drop multiplex module is connected to the output port of the first optical add-drop multiplex module They are respectively connected to the eastbound optical fiber ring chain, and the upwave port and downwave port of each optical add-drop multiplexing module are independently connected to the receiving end and sending end of the main channel or backup channel of the synchronous digital series equipment at the location.

The wave-down port of the above-mentioned first optical add-drop multiplexing module is a west-down wave end, which is connected to the main channel of the synchronous digital serial equipment at the location, and the wave-up port of the optical add-drop multiplexing module is a west-bound wave end, It is connected to the main channel sending end of the synchronous digital series equipment at the location; the downwave port of the second optical add-drop multiplexing module is the east downwave end, which is connected to the backup channel receiving end of the synchronous digital equipment at the location , the upwave port of the optical add/drop multiplexing module is the east upwave port, which is connected to the spare channel sending end of the synchronous digital series equipment at the location.

On the other hand, an optical add-drop multiplexing module for the optical fiber ring network system includes an upper wave part, a lower wave part, a multi-wavelength signal input port and an output port connected to the optical fiber ring chain, and several synchronous digital serial devices The connected upwave port and downwave port are characterized in that they are also provided with a downwave part pass-through output port for outputting multi-wavelength signals and an upwave part pass-through input port for inputting multi-wavelength signals, and the input port, each downwave port The pass-through output ports of the downwave part and the downwave part are respectively connected to the downwave part, and the output port, each upwave port and the upwave part pass-through input port are respectively connected to the upwave part.

In another aspect, the method for upgrading and expanding capacity of the optical fiber ring network system includes the following steps:

1), disconnect the connection port of the first optical add-drop multiplexing module and the second optical add-drop multiplexing module in the optical add-drop multiplexing node in the optical fiber ring network system;

2), connect the third optical add-drop multiplexing module and the fourth optical add-drop multiplexing module in series between the disconnected first optical add-drop multiplexing module and the second optical add-drop multiplexing module, wherein the first The lower wavelength part of the optical add-drop multiplexing module passes through the output port to connect to the input port of the third optical add-drop multiplexing module; the upper wave part of the first optical add-drop multiplexing module passes through the input port to connect to the third optical add-drop multiplexing module The output port of the second optical add-drop multiplexing module, the lower wave part of the second optical add-drop multiplexing module passes through the output port to connect to the input port of the fourth optical add-drop multiplexing module; the upper wave part of the second optical add-drop multiplexing module passes through the input port and connects to the fourth The output port of the optical add-drop multiplexing module; the pass-through output port of the lower wave part of the third optical add-drop multiplex module is connected to the pass-through input port of the upper wave part of the fourth optical add-drop multiplex module, and the pass-through input port of the third optical add-drop multiplex module The pass-through input port of the upwave part is connected to the passthrough output port of the downwave part of the fourth optical add-drop multiplexing module.

Because the present invention adopts the optical add-drop multiplexing module structure with the upper and lower wave pass-through ports, it cleverly uses the upper and lower wave pass-through ports as the upgrade and expansion ports to realize the serial connection between adjacent optical add-drop multiplex modules , so that the downwave part of the first OADM module and the upwave part of the second OADM module are used together to form an OADM unit as a loop channel from west to east; at the same time, the second OADM The drop wavelength part of the add-drop multiplexing module and the add-wave part of the first optical add-drop multiplexing module together form another OADM unit, which serves as an east-to-west loop channel. Make the dual-fiber ring pass through the first and second OADM units, that is, define one OADM board as the west direction, and one OADM board as the east direction. If the SDH multiplex section protection ring network is carried, the main channel of the SDH equipment The receiving end of the line board is connected to the west down wave of the OADM site, the sending end of the line board of the main channel is connected to the west up wave of the OADM site; and the receiving end of the backup channel line board of the SDH equipment is connected to the east of the OADM site For downward wave, the transmission end of the circuit board of the standby channel is connected to the east of the OADM site for upward wave; if one of the OADM modules is replaced or the OADM module is upgraded or expanded, one of the active and standby channels is always working, so the MSP loop will not be interrupted; According to the usual OADM module, one OADM board is used for the east-to-west line, and one OADM board is used for the west-to-east line. In this way, for the SDH dual-fiber or four-fiber multiplex section protection ring network, the SDH equipment The transceiver of the main channel line board is always connected to two OADM modules, and the transceiver of the backup channel line is also connected to the two OADM modules, so replacing any OADM board or upgrading and expanding the capacity will interrupt the SDH MSP ring network. Therefore, the connection structure adopted by the present invention does not need to interrupt the service when the OADM unit is replaced, upgraded and expanded for SDH services using dual-fiber or four-fiber multiplex section protection switching rings. It solves the problem of service interruption when dual-fiber or multiplex section protection switching ring is upgraded and expanded. Moreover, the upgrade and expansion will not affect the power budget of the wavelengths already carrying services and the existing insertion loss of the uplink and downlink. When the upper and lower wave insertion loss is small.

Describe basic structure and working principle of the present invention in detail below in conjunction with accompanying drawing:

Description of drawings

Fig. 1 is a schematic diagram of the basic structure of an existing optical add-drop multiplexing module;

Fig. 2 is a schematic diagram of the connection structure of an existing optical add-drop multiplexing module;

Fig. 3 is a schematic diagram of the position structure of the existing optical add-drop multiplexing module in the dual-fiber ring network;

Fig. 4 is a schematic diagram of the position structure of the existing optical add-drop multiplexing module in the four-fiber ring network;

Fig. 5 is a schematic diagram of the position and structure of the existing optical add-drop multiplexing module when it is upgraded and expanded;

Fig. 6 is a schematic diagram of the basic structure of the optical add-drop multiplexing module of the present invention;

Fig. 7 is a schematic diagram of the connection structure of the optical add-drop multiplexing module of the present invention;

Fig. 8 is a schematic diagram of the position and structure of the optical add-drop multiplexing module of the present invention in a dual-fiber ring network;

Fig. 9 is a schematic diagram of the position structure of the optical add-drop multiplexing module in the four-fiber ring network according to the present invention.

Fig. 10 is a schematic diagram of the position and structure of the optical add-drop multiplexing module according to the present invention when it is upgraded and expanded.

Detailed ways

As shown in Figure 6, an optical add-drop multiplexing module according to the present invention includes an upwave part, a downwave part, a multi-wavelength signal input port and an output port connected to an optical fiber ring chain, several synchronous digital The upwave port and downwave port connected to the series equipment is characterized in that it is also equipped with a downwave part pass-through output port for outputting multi-wavelength signals and an upwave part pass-through input port for inputting multi-wavelength signals. The input port, each downwave The port and the drop-through output port are respectively connected to the drop part, and the output port, each up-wave port and the up-wave pass-through input port are respectively connected to the up-wave part. Wherein in order to facilitate the serial connection of two optical add-drop multiplexing modules, the above-mentioned multi-wavelength signal input port and multi-wavelength signal output port are distributed in the optical add-drop multiplexing both sides of the module.

In the following description of the optical fiber ring network system, in order to more intuitively and clearly express the direction and position relationship of the optical fiber ring chain, in the following description, the left to right in the ring chain shown in the relevant drawings is defined as west direction , from right to left is defined as east to express, of course, this definition is relative, that is, the two are interchangeable, in this embodiment, the east and west are mainly defined according to the convenience and intuition of description.

An optical fiber ring network system according to the present invention includes at least one set of optical fiber ring chains 100 for bidirectional transmission, a plurality of optical add-drop multiplexing nodes 200 arranged in the optical fiber ring chain 100 and a plurality of optical fiber ring chains 100 Connected synchronous digital series equipment 300, the optical fiber ring chain 100 referred to in this embodiment can be the bidirectional optical fiber ring chain in the bidirectional optical fiber ring network system as shown in Figure 8, each optical add-drop multiplexing type node 200 at this moment It consists of two optical add-drop multiplexing modules 201 and 202 connected in series. As shown in FIG. The upper wave part is connected through the input port, and the input port of the first optical add-drop multiplexing module 201 and the output port of the second optical add-drop multiplexing module 202 are respectively connected to the westward optical fiber ring chain 101, and the second optical add-drop multiplexing module The pass-through output port of the lower wave part of the module 202 is connected to the pass-through input port of the upper wave part of the first optical add-drop multiplexing module 201, and the input port of the second optical add-drop multiplex module 202 and the first optical add-drop multiplexer The output port of the module 201 is respectively connected with the optical fiber ring chain 102 to the east, and the wave port and the wave port of each optical add-drop multiplexing module 201, 202 are respectively connected with the main channel or backup port of the synchronous digital series equipment 300 at the location. The receiving end and the transmitting end of the channel are independently connected. At this time, the downwave port of the first optical add/drop multiplexing module 201 is the west downwave end, which is connected to the main channel of the synchronous digital serial device 300 at the location. The wave-up port of the multiplexing module is a west wave-up port, which is connected to the main channel sending end of the synchronous digital serial device 300 at the location; the wave-drop port of the above-mentioned second optical add-drop multiplexing module 202 is an east wave-down port , which is connected to the receiving end of the standby channel of the synchronous digital device 300 at the location, and the upwave port of the optical add-drop multiplexing module is an east-upwave terminal, which is connected to the sending end of the backup channel of the synchronous digital serial equipment 300 at the location . The optical fiber ring chain 100 described in this embodiment can also be a four-way optical fiber ring chain in the four-way optical fiber ring network system as shown in Figure 9, and each optical add-drop multiplexing node is composed of four optical add-drop Each bidirectional optical fiber ring chain is also composed of two optical add-drop multiplexing modules connected in series, and its connection structure is exactly the same as that of the optical add-drop multiplexing nodes in the dual-fiber ring network system. will not be described in detail.

At the same time, the optical fiber ring network system of the present invention can be upgraded and expanded as long as the through ports of the two optical add-drop multiplexing modules are disconnected, and two optical add-drop multiplexing modules of other wavelengths can be connected in series. The connection structure is shown in Figure 10. The specific method is: first disconnect the first optical add-drop multiplexing module 201 and the second optical add-drop multiplexing module 202, and then connect the third optical add-drop multiplexing module 203 and the fourth optical add-drop multiplexing module 203 and the fourth optical add-drop multiplexing module in series. The multiplexing module 204 connects the output port of the lower wavelength part of the first optical add-drop multiplexing module 201 to the input port of the third optical add-drop multiplexing module 203; the upper wave part of the first optical add-drop multiplexing module 201 passes through The input port is connected to the output port of the third optical add-drop multiplexing module 201, and the wave-down part of the second optical add-drop multiplexing module 202 passes through the output port to connect the input port of the fourth optical add-drop multiplexing module 204; The upper wave part of the add-drop multiplexing module 202 passes through the input port to connect the output port of the fourth optical add-drop multiplexer module 204; the lower wave part of the third optical add-drop multiplexer module 203 passes through the output port to connect the fourth optical add-drop multiplexer The upper wavelength part of the module 204 passes through the input port; the upper wave part of the third optical add-drop multiplexing module 203 passes through the input port and connects to the fourth optical add-drop multiplexing module 204 The lower wavelength part passes through the output port. More upgrades and expansions can be connected in series and so on.

Claims (5)

1, a kind of optical fiber ring network system, the optical fiber loop chain that comprises at least one group of transmitted in both directions, be arranged on a plurality of Optical Add Drop Multiplexer type nodes and a plurality of synchronous digital series device that is connected with the optical fiber loop chain in the optical fiber loop chain, it is characterized in that each Optical Add Drop Multiplexer type node is composed in series by two OADM modules respectively, wherein the following ripple part break-through output port of first OADM module is connected with the last ripple part break-through input port of second OADM module, and the output port of the input port of first OADM module and second OADM module respectively with the west to the optical fiber loop chain be connected, the following ripple part break-through output port of second OADM module is connected with the last ripple part break-through input port of first OADM module, and the output port of the input port of second OADM module and first OADM module is connected with the optical fiber loop chain of east orientation respectively, and the last ripple port of each OADM module and following ripple port respectively with the main channel of the synchronous digital series device of position or the receiving terminal and the transmitting terminal separate connection of passage fully.

2, optical fiber ring network according to claim 1 system, the following ripple port that it is characterized in that above-mentioned first OADM module is the downward ripple end in west, its main channel with the synchronous digital series device of position is connected, the last ripple port of this OADM module is a upwards ripple end of west, and it is connected with the main channel transmitting terminal of the synchronous digital series device of position; The following ripple port of above-mentioned second OADM module is a ripple end under the east orientation, its passage receiving terminal that is equipped with the synchronous digital equipment of position is connected, the last ripple port of this OADM module is a ripple end on the east orientation, and its passage transmitting terminal that is equipped with the synchronous digital series device of position is connected.

3, a kind of optical fiber ring network as claimed in claim 1 system OADM module, include the ripple part, following ripple part, the multi-wavelength signals input port and the output port that are connected with the optical fiber loop chain, several last ripple ports that are connected with synchronous digital series device and following ripple port, it is characterized in that also being provided with the last ripple part break-through input port that is used to export the following ripple part break-through output port of multi-wavelength signals and is used to import multi-wavelength signals, input port, each time ripple port reaches down, and ripple part break-through output port partly is connected output port respectively with following ripple, ripple port and last ripple part break-through input port partly are connected with last ripple respectively on each.

4, optical fiber ring network according to claim 3 system OADM module is characterized in that above-mentioned multi-wavelength signals input port and multi-wavelength signals output port and following ripple part break-through output port and last ripple part break-through input port are distributed in the both sides of OADM module respectively.

5, the upgrade expanding method of a kind of optical fiber ring network according to claim 1 system is characterized in that may further comprise the steps:

1), first OADM module in the Optical Add Drop Multiplexer type node in the described optical fiber ring network of the disconnection system and the connector of second OADM module;

2), between first OADM module that disconnects and second OADM module serial connection the 3rd OADM module and the 4th OADM module, wherein the following ripple part break-through output port of first OADM module is connected the input port of the 3rd OADM module; The last ripple part break-through input port of first OADM module connects the delivery outlet of the 3rd OADM module, and the following ripple part break-through output port of second OADM module connects the input port of the 4th OADM module; The last ripple part break-through input port of second OADM module connects the delivery outlet of the 4th OADM module; The following ripple part break-through output port of the 3rd OADM module connects the last ripple part break-through input port of the 4th OADM module, and the last ripple part break-through input port of the 3rd OADM module connects the following ripple part break-through output port of the 4th OADM module.

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