CN101145880B - Non symmetric wave division multiplexing transmission system - Google Patents
Non symmetric wave division multiplexing transmission system Download PDFInfo
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- CN101145880B CN101145880B CN2007101276273A CN200710127627A CN101145880B CN 101145880 B CN101145880 B CN 101145880B CN 2007101276273 A CN2007101276273 A CN 2007101276273A CN 200710127627 A CN200710127627 A CN 200710127627A CN 101145880 B CN101145880 B CN 101145880B
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Abstract
The invention provides an asymmetrical wavelength division multiplexing optical transmission system, which can comprises a central office for broadcasting and transmitting optical signals of unspecific wavelength to more than one noncentral offices, and receiving more than one optical signals of specific wavelength from more than one noncentral offices; and more than one noncentral offices used for receiving the optical signals of unspecific wavelength from the central office and delivering more than one optical signals of specific wavelength to the central office in a way of wavelength division multiplex, wherein the optical signals of unspecific wavelength are not symmetric to more than one optical signals of specific wavelength. Therefore, under the conditions that the fiber resources are in short, that a large mount of services are broadcast and transmitted from the central office to the noncentral offices and that a large mount of services are converged and transmitted from the noncentral offices to the central office, the invention simplifies the constitution of the system and thereby reduces the cost of the system.
Description
Technical field
The present invention relates to a kind of non symmetric wave division multiplexing transmission system.
Background technology
Wavelength division multiplexing (Wavelength Division Multiplex, WDM) has is with roomy, long transmission distance and reliability high, has been widely used in long-distance transmission network and MAN.At present, the WDM optical transmission system adopts the mode of bi-directional symmetrical.A is identical to the Optical Fiber Transmission capacity to the B of Optical Fiber Transmission capacity and opposite direction, needs to dispose identical A at each innings station to equipment and B to equipment, A to B to wavelength use in pairs and quantity identical.
Along with increase and the professional variation of bandwidth demand, large capacity non-symmetrical service can get more and more, and namely A is not to professional identical to the capacity of business with B.Yet adopt present symmetrical WDM optical transmission system carrying non-symmetrical service can cause system configuration complicated, the equipment waste, thus increase the cost that transmits.
Thereby, be badly in need of a kind of system and can solve above-mentioned non-symmetrical service transmission problem.
Summary of the invention
In view of the above problems, the invention provides a kind of non symmetric wave division multiplexing transmission system, it overcomes the shortcoming of existing WDM optical transmission system when the carrying non-symmetrical service.
Non symmetric wave division multiplexing transmission system of the present invention can comprise: the central office is used for transmitting nonspecific wavelength light signal to non-central office broadcasting more than one, and receives an above specific wavelength light signal from non-central office more than; And non-central office more than, be used for receiving the nonspecific wavelength light signal from the central office, and adopt the mode of wavelength division multiplexing, an above specific wavelength light signal is sent to the central office, wherein, nonspecific wavelength light signal and an above special wavelength light asymmetric information.
Wherein, between central office and the non-central office and the optical fiber between the non-central office to be connected be that two fibres are two-way.Central office to non-central office is broadcasting service, and non-central office is convergence service to the central office.The type of broadcasting service and convergence service comprises: SONET/SDH (synchronous digital hierarchy), Ethernet, FC (optical-fibre channel) and DVB (digital video broadcasting).
The central office comprises: apparatus for transmitting signal, and have one and send the light mouth, be used for launching nonspecific wavelength light signal; Signal receiver has a plurality of reception light mouths, is used for receiving an above specific wavelength light signal; And optical branching filter, be used for an above specific wavelength light signal partial wave of optical fiber bar optical fiber at the most.
Apparatus for transmitting signal and signal receiver are SONET/SDH (synchronous digital hierarchy) equipment, router device or digital television transfer equipment, and optical branching filter is film filtering slice optical branching filter or array waveguide grating optical branching filter.
In addition, non symmetric wave division multiplexing transmission system also comprises: image intensifer is used for amplifying nonspecific wavelength light signal and an above specific wavelength light signal, to adapt to transmission range.This image intensifer is erbium-doped fiber amplifier.
Each non-central office includes: at least one first coupler, and the user of non-central office under a part that is used for the light signal that will receive sends to, and send another part of the light signal that receives to next non-central office; And at least one second coupler, be used for the specific wavelength light signal that affiliated non-central innings user sends is incorporated into an above specific wavelength light signal.
At least one first coupler and at least one second coupler are the Coupling power devices.
System of the present invention is a kind of asymmetric WDM optical transmission system.Thereby, compare with existing system, in the fiber resource anxiety, central office to non-central office has large capacity service broadcast to transmit, and non-central office to central office has in the situation of large capacity service convergence transmission, has simplified system's composition, thereby has reduced system cost.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of writing, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide a further understanding of the present invention, and consists of the part of specification, is used for together with embodiments of the present invention explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the block diagram according to non symmetric wave division multiplexing transmission system of the present invention;
Fig. 2 is the block diagram according to the asymmetric WDM optical transmission system of the embodiment of the invention;
Fig. 3 is the first configuration diagram of the non-central office among the present invention; And
Fig. 4 is the second configuration diagram of the non-central office among the present invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, is not intended to limit the present invention.
Fig. 1 is the block diagram according to non symmetric wave division multiplexing transmission system 100 of the present invention.As shown in Figure 1, this system comprises: central office 102 is used for transmitting nonspecific wavelength light signal to non-central office 104 broadcasting more than, and receives an above specific wavelength light signal from non-central office 104 more than; And non-central office 104 more than, be used for receiving the nonspecific wavelength light signal from central office 102, and adopt the mode of wavelength division multiplexing, an above specific wavelength light signal is sent to central office 102, wherein, nonspecific wavelength light signal and an above special wavelength light asymmetric information.
Wherein, between central office 102 and the non-central office 104 and the optical fiber between the non-central office to be connected be that two fibres are two-way.Central office 102 to non-central office 104 be broadcasting service, and non-central innings 104 102 is convergence service to the central office.The type of broadcasting service and convergence service comprises: SONET/SDH (synchronous digital hierarchy), Ethernet, FC (optical-fibre channel) and DVB (digital video broadcasting).
Apparatus for transmitting signal and signal receiver are SONET/SDH (synchronous digital hierarchy) equipment, router device or digital television transfer equipment, and optical branching filter is film filtering slice optical branching filter or array waveguide grating optical branching filter.
In addition, this non symmetric wave division multiplexing transmission system 100 also comprises: image intensifer is used for amplifying nonspecific wavelength light signal and an above specific wavelength light signal, to adapt to transmission range.This image intensifer is erbium-doped fiber amplifier.
Each non-central office 104 includes: at least one first coupler, and the user of non-central office under a part that is used for the light signal that will receive sends to, and send another part of the light signal that receives to next non-central office; And at least one second coupler, be used for the specific wavelength light signal that affiliated non-central innings user sends is incorporated into an above specific wavelength light signal.
At least one first coupler and at least one second coupler are the Coupling power devices.
Fig. 2 is the block diagram according to the asymmetric WDM optical transmission system of the embodiment of the invention.As shown in Figure 2, optical transmission system of the present invention is comprised of three parts: central office, non-central office, circuit optical fiber.As shown in Figure 2.The central office is 1, non-central office be 1 to M (M=1,2,3 ...), the optical fiber of interoffice is connected to two fine two-way.
The central office adopts nonspecific wavelength light signal to transmit to all non-central office broadcasting.Each non-central office is combined the specific wavelength light signal and gives the central office.Central office to non-central office be A to, be for non-central innings B to the central office to.A to B be asymmetric to light signal.A is to transmitting 1 nonspecific wavelength light signal, and B transmits N specific wavelength light signal (λ to the mode that adopts wavelength division multiplexing
1λ
2... λ
N).A to signal type and speed and B to signal type and speed can be fully different.
A is to transmitting broadcasting service, and type of service can be SONET/SDH, Ethernet, FC and DVB, and B is to transmitting N convergence service, and type of service can be SONET/SDH, Ethernet, FC and DVB.Each convergence service distributes a specific wavelength, and Wavelength Assignment meets industry standard.
In the central office, " the professional Tx in central office " is apparatus for transmitting signal, sends the light mouth and only has one, is nonspecific wavelength light signal." central office professional Rx " be signal receiver, receive the light mouth have N (N=1,2,3 ...), receive the specific wavelength light signal from N user's transmission in the non-central office, wavelength meets the WDM standard.ODU (optical branching filter) is with N specific wavelength light signal (λ in the optical fiber
1λ
2... λ
N) partial wave is to N root optical fiber.OA is image intensifer, with optical signal amplification, is used for bucking-out system optical fiber and optical device to the decay of light signal, has prolonged transmission range, makes native system can be applied to long-distance transmission.
" the professional Tx in central office " and " the professional Rx in central office " can be SONET/SDH equipment, router device, digital television transfer equipment.ODU can be TFF (film filtering slice) optical branching filter or AWG (array waveguide grating) optical branching filter.OA generally adopts EDFA (erbium-doped fiber amplifier).According to transmission range, the OA of central office can use or not use or part is used.
Coupler 1 in the non-central office is the Coupling power device, is used for a main optical signal minute part is given the user of local exchange, and a part continues to transmit for non-central innings downstream in addition, according to number of users, can dispose a plurality of couplers 1 in the same non-central office.Coupler 2 is the Coupling power device, is used for the specific wavelength light signal that the local subscriber sends is incorporated into main optical signal, according to number of users, can dispose a plurality of couplers 2 in the same non-central office.
In addition, in the non-central office, user 1 uses λ 1 wavelength to send light signal, and user 2 uses λ 2 wavelength to send light signal ..., user N uses λ N wavelength to send light signal.The below elaborates embodiment one and the embodiment two of non-central office.
Fig. 3 is the first structure (embodiment one) diagram of the non-central office among the present invention.As shown in Figure 3, non-central office is comprised of coupler 1, coupler 2, OA, connect K user (K=1,2 ...), K＜=N.Coupler 1 is passive optical coupler, processes for the subscriber equipment of a main optical signal minute part being given local exchange, and a part continues downstream non-central office transmission in addition, according to number of users, can dispose a plurality of couplers 1 in the same non-central office.Coupler 1 can adopt the optical coupler of 80:20 or 95:5 or other splitting ratios.Coupler 2 is passive optical coupler, is used for the specific wavelength light signal that the local subscriber sends is incorporated into main optical signal, according to number of users, can dispose a plurality of couplers 2 in the same non-central office.Coupler 2 can adopt the optical coupler of 80:20 or 95:5 or other splitting ratios.According to transmission range, OA can use or not use or part is used.
Fig. 4 is the second structure (embodiment two) diagram of the non-central office among the present invention.As shown in Figure 4, non-central office is comprised of coupler 1, coupler 2, coupler 3, optical multiplexer, OA, connect K user (K=1,2 ...), K＜=N.Coupler 1 is passive optical coupler, is used for a main optical signal minute part is given the subscriber equipment processing of local exchange, and a part continues to transmit for non-central innings downstream in addition.Coupler 1 can adopt the optical coupler of 80:20 or 95:5 or other splitting ratios.Coupler 2 is passive optical coupler, is used for the specific wavelength light signal that the local subscriber sends is incorporated into main optical signal.Coupler 2 can adopt the optical coupler of 80:20 or 95:5 or other splitting ratios.Coupler 3 is " 1 enters K goes out " passive optical coupler, and the light signal of inputting is dispensed to K output according to power averaging.Optical multiplexer is with K specific wavelength light signal (λ of input
1λ
2... λ
K) close in ripple to an optical fiber, can adopt TFF (film filtering slice) optical multiplexer or AWG (array waveguide grating) optical multiplexer.According to transmission range, OA can use or not use or part is used.
In sum, adopt system of the present invention, in the fiber resource anxiety, central office to non-central office has large capacity service broadcast to transmit, and non-central office to central office has in the situation of large capacity service convergence transmission, has simplified system's composition, thereby has reduced system cost.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a non symmetric wave division multiplexing transmission system is characterized in that, comprising:
The central office, be used for transmitting a nonspecific wavelength light signal to non-central office broadcasting more than one, and from described more than one non-central office receive an above specific wavelength light signal, wherein, a described above specific wavelength light signal comprises a plurality of different wave length signals; And
Described non-central office more than is used for receiving the described nonspecific wavelength light signal from described central office, and adopts the mode of wavelength division multiplexing, and a described above specific wavelength light signal is sent to described central office,
Wherein, described nonspecific wavelength light signal and a described above special wavelength light asymmetric information.
2. system according to claim 1 is characterized in that,
Between described central office and the described non-central office and the optical fiber between the described non-central office to be connected be that two fibres are two-way.
3. system according to claim 2 is characterized in that, described central office to described non-central office is broadcasting service, and described non-central office is convergence service to described central office.
4. system according to claim 3 is characterized in that, the type of described broadcasting service and described convergence service comprises: synchronous digital hierarchy, Ethernet, optical-fibre channel, digital video broadcasting.
5. system according to claim 1 is characterized in that, described central office comprises:
Apparatus for transmitting signal has one and sends the light mouth, is used for launching described nonspecific wavelength light signal;
Signal receiver has a plurality of reception light mouths, is used for receiving a described above specific wavelength light signal; And
Optical branching filter is used for the described above specific wavelength light signal partial wave of optical fiber bar optical fiber at the most.
6. system according to claim 5, it is characterized in that, described apparatus for transmitting signal and described signal receiver are synchronous digital series devices, or router device, or digital television transfer equipment, and described optical branching filter is film filtering slice optical branching filter or array waveguide grating optical branching filter.
7. system according to claim 1 is characterized in that, also comprises:
Image intensifer is used for amplifying described nonspecific wavelength light signal and a described above specific wavelength light signal, to adapt to transmission range.
8. system according to claim 7 is characterized in that, described image intensifer is erbium-doped fiber amplifier.
9. system according to claim 1 is characterized in that, each described non-central office includes:
At least one first coupler, a part that is used for the light signal that will receive sends the user of described non-central office to, and sends another part of the light signal that receives to next non-central office; And
At least one second coupler is used for the specific wavelength light signal that described non-central innings described user sends is incorporated into a described above specific wavelength light signal.
10. system according to claim 9 is characterized in that, described at least one first coupler and described at least one second coupler are the Coupling power devices.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007026749A1 (en) * | 2005-08-31 | 2007-03-08 | Mitsubishi Electric Corporation | Optical communication network system, parent station optical communication device, and child station optical communication device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2007026749A1 (en) * | 2005-08-31 | 2007-03-08 | Mitsubishi Electric Corporation | Optical communication network system, parent station optical communication device, and child station optical communication device |
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