EP1304013A2

EP1304013A2 - Modular optical network node

Info

Publication number: EP1304013A2
Application number: EP01953890A
Authority: EP
Inventors: Christian Scheerer; Jörg-Peter ELBERS; Christoph Glingener
Original assignee: Siemens AG; Nokia Siemens Networks GmbH and Co KG
Current assignee: Nokia Solutions and Networks GmbH and Co KG
Priority date: 2000-07-27
Filing date: 2001-07-09
Publication date: 2003-04-23
Also published as: DE10036700A1; US20030128985A1; WO2002011489A3; WO2002011489A2

Abstract

The invention relates to a modular optical network node, which divides the optical input signals into optical subbands, processed by a central element or by several central elements and which then recombines the optical subbands once again to form an optical output signal. Various functionalities, such as add-drop functionality, a drop and continue functionality, a multicast functionality, a broadcast functionality, a ring interconnect functionality, and a cross connect functionality, can be assigned to the central element or to the central elements of the modular optical network node. According to the assignment of a functionality, the modular optical network node can be used in networks having a different structure.

Description

description

Modular optical network node

The invention relates to a modular optical Netzwerkkno ^¬ th, which can make an interconnection of optical signals on Subbandbasis and a method for transmitting optical signals in the optical network devices on this modular optical network nodes.

Optical networks use the wide available bandwidth (> 10 THz for single-mode fibers) of glass fibers for message transmission. For an effective use of the available transmission capacity, the entire bandwidth is appropriately further divided. This is usually accomplished in systems with high transmission capacity through the use of wavelength division multiplexers, i.e. by transmitting different channels on different optical carrier wavelengths.

The transmission of information based on optical networks typically takes place through a hierarchical network structure. The transitions between the individual hierarchy levels are guaranteed via network nodes. However, network nodes are also necessary for the establishment of meshed network topologies of the same hierarchy level. Network nodes can also be used so that optical network elements can access certain wavelengths or wavelength ranges. Depending on the application, there are network nodes with different functionality (e.g. OADMs, i.e. optical add-drop multiplexers, .ring interconnects or optical cross-connects).

In previous solutions, optical network nodes were used to convey information or to access information or both in combination. Optical multiplex bundle switches (OXC, ie optical cross-connections) are used, which carry out a switching on a wavelength basis. However, wavelength switching based on individual wavelengths leads to very complex solutions for switching concepts and the construction of optical network nodes if large transmission capacities with a high number of channels are required.

Non-blocking multiplex bundle switches require a large number of optical switches with the desired high number of channels, which complicate the technical feasibility and also cause considerable costs. In addition, the wavelength pattern of the channels is fixed by the multiplexers and demultiplexers in the optical switching nodes. An adaptation to e.g. Different types of fibers or an expansion by increasing the number of channels is therefore difficult.

The object of the invention is therefore to provide a flexible and low-effort implementation of a modular optical network node for the transmission of information and / or data

Specify access to information, especially with large transmission capacities and high number of channels.

This object is achieved by a modular optical network node, which can interconnect optical signals on a subband basis, according to claim 1. An associated method and use is specified in independent claims. Advantageous further developments are specified in the subclaims.

In particular, the object is achieved by a modular optical network node which comprises at least one module for selecting subbands and the module for selecting subbands has at least one preselection device for preselecting at least one optical subband, at least one subband multiplexing device and at least one subband demultiplexing device and additionally at least one Central element is provided. The preselection device is preferably used to divide the available optical bandwidth of an optical signal. The module for selecting subbands is made possible by the preselection device and the at least one subband demultiplexing device to select subbands of an available optical bandwidth, and to convey them via at least one central element and to process them further as required.

The preselection device for preselecting at least one optical subband is designed in such a way that the subband structure or division of the available optical bandwidth into individual subbands can be determined or predetermined. The preselection device can divide the optical bandwidth into subbands on the basis of a predefined setting. The preselection device is particularly preferably configurable, ie the determinability of the subbands by the preselection device can be changed. The preselection device is very particularly preferably remotely configurable. There are two preferred options: In centrally controlled networks, remote configurability can be achieved via a network management system using a software solution. The preselection device can then be implemented by a software solution in network management and correspond to values in tables which are forwarded to the demultiplex device or the filter arrangement arranged there in order to preselect the physical manipulated variables in such a way that the available optical bandwidth can be divided into the predetermined subbands is. The preselection device is very particularly preferably a storage device in which values can be stored which correspond to the corresponding subband divisions. In other networks, for example meshed networks, on the other hand, the preselection devices can be configured remotely by means of an intelligence which is present in each preselection device itself. These preselection devices can then be reconfigured using suitable protocols. ö tr rt tr P cn cn σ sQ P α _g cn Hi rt ö P ö

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instruments. With the same functionality, the number of subbands to be processed can be increased in combinations. The functionality of the modular optical network node can be expanded by adding individual central elements.

The modular optical network node can be used for conveying information or for accessing information or both in combination. It allows use as an OADM, ring interconnect or OXC. It is particularly preferably used in typical hierarchical network structures consisting of meshed or ring-shaped wide area networks, ring networks for the metro area and tree-shaped network topologies in the access area.

In a very particularly preferred exemplary embodiment, the modular optical network nodes or some components of the modular optical network node are designed in duplicate in order to ensure the protection of the optical paths and of the network elements.

In a particularly preferred embodiment, the functionalities of the central elements of the modular optical network node can be different. Then a scalable, modular optical network node with different central elements is created. Different compositions of the modular optical network nodes through the modules for the selection of subbands with central elements of different functionality allow the basic expansion of the functionalities of the network nodes.

With this arrangement, the modular optical network node optionally comprises one or more optical switching stages, as well as several subband demultiplexing devices or subband multiplexing devices, depending on the number of incoming and outgoing fibers and the maximum subbander to be switched. In a particularly preferred embodiment co co t to P>P>

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P φ N φ P a P P Φ φ P- hj φ tK P P P hj d φ tr P N N ö n- cn p. P hj P Z P- to X hj hi Φ N tr Φ hj P P O O φ P tr hfl P P sQ d P- φ Ω Φ sQ

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Hl h- ^> rt fr td P li rt rt P φ P P- Φ p Φ en h- ¹ P tr P P- hj O Φ n- P P. P- hj tr φ P cn P sQ ddg PP tr hj Ω tr <! d to tr PPP P- P IM P- ¹ P

P P- P o φ φ PP dd SJ PP Hl P tr o Ω P. P IM P. tr ¹ cn hj Φ P- N t- ¹ d Ω d rt P cn iQ ιq H ^> P Φ tr Ps ¹ d P Φ P hj tr P. P d Φ Φ Φ n- - ^π Ω Φ Φ tr hj φ P φ rt Qπ P "hj O: rt cn OP Φ iQ 1 P _^ n- j Ω P tr n-

PNP cn N tr CΛ ö P- P "Φ P φ P. hj Φ Hl ü Φ cn cn 3 tr Φ Φ P cn d Φ Φ cn cn d φ sgd φ φ P- P cn hj Φ ^ d ιq 0 hj tr CΛ rt p- rt P Φ rt cn P- P- φ 3 P 3 - ^π P- P rt Φ P- o hj P-> Φ hj o Φ dd tr rt d CΛ P d rt PPP • XX Φ P φ PP 13 P ¹ π tr 13 P tr P Φ P CΛ et P

M H- φ fr X iQ p: • P rt IN rt P Φ Φ tr iQ <<! sQ d l-i CΛ ιq

P sQ rt cn d tr d Φ Φ P N P- P- Φ 1 P P CΛ p: cn o P tr Φ d cn

P ¹ «P- P- cn NP P- Hi iQ d td d cn hj hj ö Φ rt rt Φ P 13 hj hj N tr Ω tr 13 tr P o Ω sQ z P- P p: Φ cn P Ω P ¹ P hj P Φ d P- P φ N n- dp: Ps ¹ tr Φ

P ¹ dd Φ tr r- hj iQ P <! P tr P o H Hi P Φ sQ d P hj P Φ pj: iQ

Φ Hi 13 Φ iQ P- rt fr φ P- - ¹ 15 CΛ cn Φ NH Φ ιq tr PPP Φ

P- sQ φ o P P- φ P Ω P hj cn P- P tr 1 ddd h- ^π rt (- ^■ S Φ <! PP ¹ rt hj h-> 13 tr Ω P- P tr s: P s: rt P P- rt Φ CΛ tr tr> Hi CΛ Φ hj Φ Φ

Φ d 1 rt Φ tr PN rt Φ p: φ PO <ι rt tr tr σ 0 tu <ZP 13 hj hj CΛ hj P P- hj φ d hj PP P- rt hj od P p: CΛ ιq Φ φ P CΛ P ^< P πd

3 P O cn P tr P P Φ P. d tr Φ φ hj Hl P P P φ tr hj hj α cn tu d td

P P Ω P φ CΛ Φ ιq Φ φ Ω hj ιq P N φ P Qπ P Φ

P- φ tr z Qπ p: cn ω P rt d l-i d cn P P tr φ 1 d 1 φ • 1 φ Φ 3 d φ rt d s:

Φ tr ii φ Ω tr og hj sQ li PP d P hj Φ ω Φ 1 1 tr 1 P rt 1 1 sQ 1 1 hj 1 1

rial or erbium-doped waveguide) can amplify the signals.

The add-drop multiplexer for bidirectional networks described in FIG. 2 can also be used in unidirectional networks.

FIG. 3 shows the same structure as in FIG. 2. Only the central elements ZEn, ZEn have been changed, which comprise a circuit with drop-continue functionality or with multicast functionality. The circuits consist of a room switching stage with drop-and-continue capability.

The central elements ZEn, ZEm allow a wavelength or a sub-band to be extracted in the node and a new wavelength or band to be added (add-drop functionality). The incoming subbands can particularly preferably be routed on the one hand to the add-drop stage ADSn, ADSm and at the same time forwarded to the output fiber without a new subband being added (multicast / broadcast functionality, drop-and-continue functionality). Different implementations and a different structure (single-stage / multi-stage) can be used for the switching stage. Switching matrices are particularly preferred as the switching stage, in which the number of switching elements can be reduced, e.g. Switching matrices according to CLOS and BENES. Depending on the type and use, the switching matrices can be selected to be strictly non-blocking or not strictly non-blocking.

The modular optical network node MON described in FIG. 3 with drop-and-continue functionality for bidirectional networks can also be used in unidirectional networks.

FIG. 4 shows the use of a modular network node as a ring interconnect. It is now the construction groups for selecting subbands BAU1 - BAU4. Each module divides the available optical bandwidth VOS into subbander SB. Each of the subbands is processed by a central element. FIG. 4 shows the processing of a subband per assembly for the selection of subbands BAU1 - BAU4 by a central element ZE1 - ZE4. Each of the central elements ZE1 - ZE4 of the respective modules for selecting subbands BAU1 - BAU4 has a room switching stage. The room switching stages particularly preferably have drop-and-continue capability. Different implementations and a different structure (single-stage / multi-stage) can be used for the room switching stages. In addition, it is advantageous that local add-drop stages ADS1-ADS4 (not shown) with the associated properties can be connected to the central elements ZE1-ZE4. The room switching stages are connected to one another in such a way that a central element ZE1 of the first module for selecting subbands BAU1 is connected to the module for selecting subbands BAU3 and a central element ZE3 of the module for selecting subbands BAU3 is connected to the module for selecting subbands BAU1 , Furthermore, a central element ZE2 of the module for selecting subbands BÄIT2 is connected to the module for selecting subbands BAU4, and a central element ZE4 of the module for selecting subbands BAU4 is connected to the module for selecting subbands BAU2.

Instead of the central elements ZE1-ZE4, a ring interconnect can particularly preferably have further central elements which represent combinations of the central elements ZE1-ZE4

(Eg a central element for the execution from ZE1 and ZE3 and a central element for the backward direction from ZE2 and ZE4). The ring interconnect very particularly preferably has a central element switching stage ZES. The ring interconnect described in FIG. 4 for bidirectional networks can also be used in unidirectional networks.

Figure 5 illustrates the use of a modular optical network node MON as a cross-connect this case are four construction ^¬ group for selection of sub-bands progress1 -. BAU4 shown. The respective central elements of the module for selecting subbands BAU1 - BAU4 are shown as a central element switching stage ZES. The central element switching stage ZES has a switching matrix which can be constructed, for example, with micromechanical switches, integrated optical switches, liquid crystal switches and enables the subbands to be switched between the incoming and outgoing fibers. In addition to a pure switching property, the switching matrix can also have drop-and-continue or multicast or add-drop options.

The cross-connect described in FIG. 5 for bidirectional networks can also be used in unidirectional networks.

With the modular optical network node according to the invention, a flexible and low-effort implementation for large transmission capacities and high number of channels was provided. The invention relates to a modular optical network node that divides optical input signals into optical subbands, processes them through a central element or a plurality of central elements, and then recombines the optical subbands into an optical output signal. The central element or the central elements of the modular optical network node can have various functionalities, such as an add-drop functionality, a drop-and-continue functionality, a multicast functionality, a broadcast functionality, a ring interconnect functionality and a cross -Connect functionality. Depending on the assignment one

Functionality, the modular optical network node can be used in networks with different structures.

Claims

claims

1. Modular optical network node (MON) comprising at least one assembly (BAU) for selecting subbands, characterized in that the assembly (BAU), at least one preselection device (VE) for preselecting at least one optical subband (SB), at least one Subband multiplexing device (SMUX) and at least one subband demultiplexing device (SDMUX) and at least one central element (ZE) is additionally provided.

2. Modular optical network node (MON) according to the preceding claim, characterized in that the optical subbands (SB) can be dynamically selected by the assembly (BAU).

3. Modular optical network node (MON) according to one of the preceding claims, characterized in that the optical subbands (SB) can be selected by the assembly (BAU) by at least one central frequency.

4. Modular optical network node (MON) according to one of the preceding claims, characterized in that the central element (ZE) is a circuit with add-drop functionality; and / or a circuit with drop-continue functionality; and / or a circuit with multicast functionality; and / or a circuit with broadcast functionality; and / or a circuit with ring interconnect functionality; and / or includes a circuit with cross-connect functionality.

5. Modular optical network node (MON) according to one of the preceding claims, characterized in that the central element (ZE) has at least one local add-drop stage (ADS).

6. Modular optical network node (MON) according to one of the preceding claims, characterized in that the assembly (BAU) has at least one device for adapting the power level (SPE, SCPE).

7. Modular optical network node (MON) according to one of the preceding claims, characterized in that the preselection device (VE) is integrated into the subband multiplex device (SMUX) and / or the subband demultiplex device (SDMUX).

8. Modular optical network node (MON), characterized in that the modular optical network node (MON) comprises at least two modules (BAU).

9. A method for transmitting optical signals in optical network devices via a modular optical network node (MON) according to the preceding claims, characterized in that it comprises the following method steps: - Decomposing an optical input signal into optical subbands (SB)

Processing of the optical subbands (SB) by at least one central element (ZE)

Recombination of the optical subbands (SB) to an optical output signal.

10.Use of modular optical network nodes (MON) according to one of the preceding claims for realizing a circuit with add-drop functionality; and / or a circuit with drop-and-continue functionality; and / or a circuit with multicast functionality; and / or a circuit with broadcast functionality; and / or a circuit with ring interconnect functionality; and / or a circuit with cross-connect functionality.