CN2465407Y - Bus based optical division inserting multiplexer - Google Patents

Abstract

The utility model relates to a bus structure based optical division inserting multiplexer, which at least comprises a wave decomposition multiplexing/multiplexer. The important is that the multiplexer also further comprises a lower way port group and an upper way port group; the wave decomposition multiplexing/multiplexer, the lower way port group and the upper way port group are connected through a bus group. The bus group comprises more than one buses corresponding to different wavelength; the lower way port group at least comprises one lower way port module; the upper way port group at least comprises one upper way port module; each lower way port module or upper way port module is respectively corresponding to one lower way port or one upper way port. The lower way port module or the upper way port module is mainly composed of a coupled apparatus or an Optical switch apparatus.

Description

Based on bus-structured optical add/drop multiplexer

The utility model relates to a kind of optical add/drop multiplexer, is meant a kind of optical add/drop multiplexer that adopts bus structures to realize the add drop multiplex function especially.

Along with the arrival of network times, people grow with each passing day to the demand of network development.Optical synchronization digital transmission network (SDH) is exactly a representative of modern efficient communication network development, it combines synchronous digital transmission system and Fibre Optical Communication Technology, transmission of multiplexing, circuit and function of exchange are combined together, utilize Optical Fiber Transmission, and adopt unified network management system, improved the utilance of the resource of network widely, for user and operator provide great convenience.SDH is an important component part of present digital communication network, and it has powerful Network Management Function, comprises self-healing functions such as protection and recovery.Optical transfer network (OTN) is the developing direction of following digital communication network, be a kind of based on the novel communication network transmission system of wavelength division multiplexing (WDM) with the optical channel technology, it has not only inherited the capacity advantage of WDM transmission system broadband high-speed, has more increased novel flexibly light networking function such as channel add drop multiplex, interconnection.OTN provides a kind of cost-effective technological means that is used to manage multi-wavelength, many fiber optic networks bandwidth resources, and wherein self-healing functions such as the protection of photosphere and recovery are to realize the important step of OTN.Since the society increasing to the dependence of information, in case communication network make mistakes, even the paralysis, will cause tremendous loss.Therefore; when network design; at first to consider protect networks; this communication network of network protection that can realize is classified from the physical topology angle; be referred to as self-healing network, it is meant and need not human intervention that network can recover entrained business automatically in the extremely short time from failure of removal; the imperceptible network of user is out of order, and its implementation comprises line switching, ring network protection or the like.

OADM is the OTN network element device of a quasi-representative, be to utilize time gas exchange to realize Bandwidth Management, promptly allow the different virtual channels (VC) between two Synchronous Transport Module level-N n layers (STM-N) signal to realize interconnection, and have interface signals (PDH) that the tap of need not and termination overall signal can various G.703 regulations or STM-N signal (SDH) access STM-M and (make the ability of any branch road in the M＞N).OADM has realized on the wavelength rank the flexible transparent configuration feature of road up and down of wavelength-division multiplex signals, thereby very has been suitable for constructing WDM annular self-healing network.

At present, a modal class formation mainly is by wavelength-division demultiplexing/multiplexer, the road optical switching network constitutes up and down in the OADM of practicability equipment, and the optical switching network of road up and down of its inside mainly adopts common 2 * 2 light shutter devices to realize.As shown in Figure 1, Fig. 1 is the basic structure schematic diagram of existing OADM, and this OADM100 mainly is made of 2 * 2 optical switches 10 and a pair of wavelength-division demultiplexing/multiplexer 11.In the use of reality, the optical multiplexed signal of multi-wavelength is used in an optical fiber and transmits simultaneously, when through OADM100, if there is not road under the signal, simultaneously also do not have new signal to set out on a journey, then this multi-wavelength signals just through wavelength-division demultiplexing/multiplexer 11, enters 2 * 2 optical switches 10 from port one 2, utilize the straight-through function of 2 * 2 optical switches 10 to be sent to port one 3, again through 11 outputs of wavelength-division demultiplexing/multiplexer.If during through OADM100, road under the signal is arranged, just tell the signal that will descend the road by wavelength-division demultiplexing/multiplexer 11, enter 2 * 2 optical switches 10 through port one 2, utilize the function of exchange of 2 * 2 optical switches 10, exchange to port one 4 outputs.If during this multi-wavelength signals process OADM100, have signal to set out on a journey, can enter 2 * 2 optical switches 10 from port one 4, utilize the function of exchange of 2 * 2 optical switches 10, exchange to port one 3, be multiplexed on this optical fiber through wavelength-division demultiplexing/multiplexer 11 again and export.Because the road optical switching network mainly adopts 2 * 2 light shutter devices to realize up and down, exists following problem so in actual applications:

1) owing to adopt 2 * 2 optical switches, so descend the road handshaking to which down road port be to fix one to one, so can not support down the broadcast transmission function of road information.

2) switching fabric of employing 2 * 2 optical switches is set out on a journey or the port number on following road has been determined by the performance structure of optical device, therefore is difficult to support to set out on a journey or the expansion of road port down, if want to expand a plurality of ports, can only replace optical device, and cost is quite expensive.

3) to require corresponding tributary signal must be single wavelength signals to existing OADM, because existing one on OADM structure is set out on a journey or the port on following road only supports to tell a kind of wavelength, connect a terminal equipment of supporting single wavelength, this port can not input or output the signal of multi-wavelength.

In view of this, it is a kind of based on bus-structured optical add/drop multiplexer that main purpose of the present utility model is to provide, and makes OADM flexible expansion to set out on a journey or following road port, and possess broadcast capability; Simultaneously, this OADM can support to set out on a journey or descend road port independently to set out on a journey or single wavelength in following road or WDM signal.

For achieving the above object, it is a kind of based on bus-structured optical add/drop multiplexer that the utility model provides, at least comprise wavelength-division demultiplexing/multiplexer, importantly: it also further comprises road port group and a port set of setting out on a journey, and wavelength-division demultiplexing/multiplexer, the road port group is connected by bus group with the port set of setting out on a journey down; Bus group comprises the bus of corresponding different wave length more than, following road port group comprises a following road port module at least, each is the corresponding following road port of road port module down, the port set of setting out on a journey comprises the port module of setting out on a journey at least, corresponding one of each port module of setting out on a journey is gone up road port, and the following road port module or the port module of setting out on a journey mainly are made up of coupled apparatus and light shutter device.

This time road port group can be cascaded by the bus and the port set of setting out on a journey, and also can be connected in parallel on the bus by coupled apparatus and light shutter device and the port set of setting out on a journey.

Described coupled apparatus is 1 * 2 optical coupler, or 1 * N optical coupler, or its combination.Described light shutter device is door type optical switch or is 1 * 2 optical switch.

Described down road port module mainly is made up of with type optical switch to the doorstep 1 * 2 optical coupler more than, 1 * N optical coupler and one, one end of 1 * 2 optical coupler links to each other with bus, the other end connects the input of door type optical switch, and 1 * N optical coupler connects the output of at least one type optical switch simultaneously.

This set out on a journey port module mainly by 1 * N optical coupler and more than one 1 * 2 optical switch form, the input of 1 * 2 optical switch, output port link to each other with bus, the last road port of 1 * 2 optical switch connects 1 * N optical coupler, and 1 * N optical coupler connects the last road port of at least one 1 * 2 optical switch simultaneously.

Provided by the utility model a kind of based on bus-structured optical add/drop multiplexer, because it adopts bus structures that the multi-wavelength composite signal is shunted on the different wave length bus, all articulate several set out on a journey port module or following road port modules on each wavelength bus arbitrarily, so this OADM has following characteristics:

1) descend road or last road port can independently descend the road or set out on a journey any wavelength arbitrarily.Owing to adopt the wavelength bus mode, the structure of the utility model OADM can be implemented in road or any circuit wavelength signals of setting out on a journey under any road down or the port position place of setting out on a journey.

2) possesses broadcast capability.OADM structural support wavelength broadcast capability of the present utility model, arbitrarily the input wavelength signal can be broadcast to arbitrarily down road port or in outlet line.

3) divide slotting tributary port all to support the access of WDM signal arbitrarily.OADM structure of the present utility model also supports the WDM signal of trackside to insert, and promptly not only can divide and insert single wavelength signals, also can divide slotting multi-wavelength signals.Following road port utilizes optical coupler to realize the multiple connection of multichannel wavelength, and last road port relies on the output wave division multiplexer to select and distinguish wavelength.So, the utility model not only can connect the terminal equipment of supporting single wavelength; Can also connect two networks as a node device, make networking mode more flexible.

4) possesses the wavelength modularity.Because adopt the wavelength bus mode, this OADM structure possesses the wavelength modularity, promptly when increasing the reuse wavelengths number, only need in bus, to increase a wavelength bus and get final product.

5) can expand road port module up and down arbitrarily.Because OADM of the present utility model adopts bus structures, can articulate several on each bus in the scope of equipment practical application conditions permit sets out on a journey or following road port module, therefore, the number of road port module is not what fix up and down, can in needs, increase or reduce and get final product, both convenient, flexible again.

Below in conjunction with drawings and the specific embodiments the utility model is further described in more detail.

Fig. 1 is the structural representation of existing OADM;

Fig. 2 is the functional mode schematic diagram of the utility model OADM;

Fig. 3 is the structural representation of the utility model OADM;

Fig. 4 is the index path of the utility model OADM one embodiment;

Fig. 5 is the index path of another embodiment of the utility model OADM.

The optical wavelength path of telling and insert appointment from the multi-wavelength multiplex signal is the basic function of OADM.Fig. 2 is the schematic diagram of the utility model OADM functional mode, and as shown in Figure 2, GI represents line interface, and TI represents tributary interface, and GI is positioned at input and output optical fiber link side, transmission be multi-wavelength multiplex signal W ₁, W ₂..., W _N, N is the reuse wavelengths number.TI is positioned at branch spigot oral-lateral, transmission be the random wave eldest son collection of group road multi-wavelength multiplex signal, both can be single wavelength signals, also can be the WDM signal.Constitute the port set 21 of setting out on a journey at a plurality of interfaces of setting out on a journey of minute spigot oral-lateral, a plurality of road interfaces down constitute road port group 22 down.And what OADM of the present utility model adopted is bus structures, rather than the optical switching network of N * N realizes exchange, therefore sets out on a journey and the tributary port number on following road can not be restricted, and can expand arbitrarily.

Fig. 3 is a structural representation of the present utility model, and as shown in Figure 3, OADM of the present utility model is mainly by wavelength-division demultiplexing/multiplexer 33, down set out on a journey port set 35 of road port group 34 and is connected by bus group.Bus group is one group of bus 30, every bus 30 corresponding wavelength.Contain several following road port modules 31 in the following road port group 34, comprise several port modules 32 of setting out on a journey in the port set of setting out on a journey 35, each is road port module 31 or set out on a journey port module 32 corresponding following road ports or last road port down.

See also shown in Figure 4ly, Fig. 4 has provided a kind of implementation of the utility model OADM.Its structure can be described as: line input signal obtains one group of single wavelength signals through the Wave decomposing multiplexer partial wave, and forms the wavelength bus structure, the corresponding bus 30 of each wavelength.Articulate road port group 34 and a port set 35 of setting out on a journey on this wavelength bus 30, following road port group 34 comprises several road port modules 31 down, and the port set of setting out on a journey 35 comprises several port modules 32 of setting out on a journey.Wherein, each is the corresponding following road port module 31 of road port down, is made of 1 * 2 optical coupler 310,1 * N optical coupler 312 and door type optical switch 311.1 * 2 optical coupler 310 is used for going out a part of light signal along separate routes from wavelength bus, when door type optical switch 311 is in conducting state, road under the corresponding wavelength can be closed each single wavelength signals of road by output 1 * N optical coupler 312 and produced road port information down.Corresponding port module 32 of setting out on a journey of road port on each, constitute by 1 * N optical coupler 312 and 1 * 2 optical switch 320,1 * N optical coupler 312 port information of will setting out on a journey is shunted to each wavelength bus, and 1 * 2 optical switch 320 is used for carrying out signal at straight-through and last trackside and selects.Wavelength-division demultiplexing/multiplexer 33 has filtering and closes the road function, can leach respective wavelength from the WDM signal of setting out on a journey and be multiplexed with output multi-wavelength line signal.

In OADM structure shown in Figure 4, divide to insert tributary port and all be articulated on the wavelength bus with modular structure, therefore additions and deletions Xia Lu and last road port neatly, and divide spigot mouth quantity unrestricted.Therefore, road port modularity about this OADM structural support.

Fig. 5 is the index path of another embodiment of the utility model, as shown in Figure 5, the operation principle of its operation principle and a last embodiment is identical, just wavelength bus is divided into down the road bus and the bus of setting out on a journey, the port set of setting out on a journey 35 and following road port group 34 are in the same place by bus parallel connection, comprise a plurality of road port modules 31 down and the port module 32 of setting out on a journey respectively, an end of the following road and the bus of setting out on a journey does not seal.So, do not interrupting under the existing situation about connecting, just can realize setting out on a journey and the expansion of following road port, promptly increase or reduce port module, make OADM not only have flexibly road port module up and down, and when Extended Capabilities Port, need not to disconnect existing light path, can not have influence on the normal operation of system, more convenient to use, flexible, and support online upgrading.

Among Fig. 4, Fig. 5, the optics that all icons are identical is all represented identical optics, and label is identical.

The above only is two preferred embodiments of the present utility model, is not to be used to limit protection range of the present utility model.

Claims (8)

1, a kind of based on bus-structured optical add/drop multiplexer, at least comprise wavelength-division demultiplexing/multiplexer, it is characterized in that: also further comprise road port group and a port set of setting out on a journey, wavelength-division demultiplexing/multiplexer, the road port group is connected by bus group with the port set of setting out on a journey down; Bus group comprises the bus of corresponding different wave length more than, following road port group comprises a following road port module at least, each is the corresponding following road port of road port module down, the port set of setting out on a journey comprises the port module of setting out on a journey at least, corresponding one of each port module of setting out on a journey is gone up road port, and the following road port module or the port module of setting out on a journey mainly are made up of coupled apparatus and light shutter device.

2, according to claim 1 based on bus-structured optical add/drop multiplexer, it is characterized in that: the described road port group down and the port set of setting out on a journey are cascaded by bus.

3, according to claim 1 based on bus-structured optical add/drop multiplexer, it is characterized in that: described road port group down is connected in parallel on the bus by coupled apparatus and light shutter device with the port set of setting out on a journey.

4, according to claim 1 based on bus-structured optical add/drop multiplexer, it is characterized in that: described coupled apparatus is 1 * 2 optical coupler, or 1 * N optical coupler, or its combination.

5, according to claim 1 based on bus-structured optical add/drop multiplexer, it is characterized in that: described light shutter device is door type optical switch.

6, according to claim 1 based on bus-structured optical add/drop multiplexer, it is characterized in that: described light shutter device is 1 * 2 optical switch.

7, according to claim 1 or 4 or 5 described based on bus-structured optical add/drop multiplexer, it is characterized in that: described down road port module mainly is made up of with type optical switch to the doorstep 1 * 2 optical coupler more than, 1 * N optical coupler and one, one end of 1 * 2 optical coupler links to each other with bus, the other end connects the input of door type optical switch, and 1 * N optical coupler connects the output of at least one type optical switch simultaneously.

8, according to claim 1 or 4 or 6 described based on bus-structured optical add/drop multiplexer, it is characterized in that: described set out on a journey port module mainly by 1 * N optical coupler and more than one 1 * 2 optical switch form, the input of 1 * 2 optical switch, output port link to each other with bus, the last road port of 1 * 2 optical switch connects 1 * N optical coupler, and 1 * N optical coupler connects the last road port of at least one 1 * 2 optical switch simultaneously.

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