WO2012014444A1

WO2012014444A1 - Optical communication processing device in optical network, and wavelength conversion method thereof

Info

Publication number: WO2012014444A1
Application number: PCT/JP2011/004200
Authority: WO
Inventors: 博一尾崎
Original assignee: 日本電気株式会社
Priority date: 2010-07-29
Filing date: 2011-07-26
Publication date: 2012-02-02
Also published as: JPWO2012014444A1

Abstract

Disclosed is an optical communication processing device that is in an optical network and that enables the effective and flexible use of a WDM wavelength resource. Further disclosed is a wavelength conversion method. The optical communication processing device (11) that performs processing of an optical signal that enters/exits a WDM optical network (10a) has an optical wavelength address conversion unit that associates at least one external wavelength (λ_AD, λ_AU) allocated from an external network (20) and a plurality of internal wavelengths (λ_1D-λ_nU, λ_1U-λ_nU) independently used within the optical network, and in accordance with the association, performs wavelength conversion between the external wavelength and the plurality of internal wavelengths.

Description

Optical communication processing apparatus in optical network and wavelength conversion method thereof

The present invention relates to a wavelength division multiplexing (hereinafter abbreviated as WDM) optical network system, and more particularly to an optical communication processing apparatus and a wavelength conversion method in an optical network.

In recent years, broadband access networks have been rapidly developed, and an optical network using a passive optical network (hereinafter abbreviated as PON) is being promoted. At present, PON based on time division multiplexing (TDM) is the mainstream, but research and development of PON using WDM is underway for future ultra-high-capacity and high-speed communication, and several proposals have been made.

For example, in Patent Document 1, in PON using WDM, a common wavelength is used for IP broadcast data transmission from a station side device (OLT) to each user side device (ONU), and an individual wavelength is used for individual data transmission from each ONU. A system using is disclosed. Patent Document 2 discloses a wavelength allocation method for automatically acquiring a wavelength used between an OLT and an ONU by negotiation.

JP 2009-081887 A JP 2009-182997 A

Currently, PON is being introduced on the public network, but in the future, it is expected that it will also be used on private networks. For example, it is considered promising for use in a storage area network (SAN) for storing and storing a large amount of data. With the progress of technology and the increase in broadband demand, WDM-PON will eventually be used for both public and private networks.

However, the number of wavelengths that can be used in WDM technology is limited. In the above-mentioned patent document, since the use or allocation of the wavelengths used between the OLT and the ONU is only considered in the wavelength resources that can be used in WDM, the wavelength resources can be effectively used. Can not. Therefore, it is clear that the problem of depletion of wavelength resources becomes more prominent as the WDM-PON usage range expands from the public network to the private network.

Therefore, an object of the present invention is to provide an optical communication processing apparatus and a wavelength conversion method in an optical network that enable effective and flexible use of WDM wavelength resources.

An optical communication processing apparatus according to the present invention is an optical communication processing apparatus for processing an optical signal entering and exiting a wavelength division multiplexing (hereinafter referred to as WDM) optical network, and is assigned to the optical network from an external network. An association means for associating at least one external wavelength with a plurality of internal wavelengths used independently in the optical network, and performing wavelength conversion between the external wavelength and the plurality of internal wavelengths according to the association. And a wavelength conversion means for performing.

A wavelength conversion method according to the present invention is a wavelength conversion method in a wavelength division multiplexing (WDM) optical network, and is independent of at least one external wavelength assigned to the optical network from an external network within the optical network. A plurality of internal wavelengths to be used are associated with each other, and wavelength conversion is performed between the external wavelength and the plurality of internal wavelengths according to the association.

According to the present invention, since a plurality of internal wavelengths can be used independently from external wavelengths in an optical network, WDM wavelength resources can be used effectively and flexibly.

FIG. 1 is a network configuration diagram schematically showing an example of an optical network system to which the present invention is applied. FIG. 2 is a block diagram showing a functional configuration of the downstream optical wavelength address converter in the optical gateway device shown in FIG. FIG. 3 is a block diagram showing a functional configuration of the upstream optical wavelength address converter in the optical gateway device shown in FIG. FIG. 4 is a network configuration diagram schematically showing an optical network system according to an embodiment of the present invention. FIG. 5 is a schematic diagram showing an example of downstream optical wavelength address conversion in each private network shown in FIG. FIG. 6 is a schematic diagram showing an example of upstream optical wavelength address conversion in each private network shown in FIG. FIG. 7 is a schematic diagram for explaining an example of use of the downstream optical wavelength address converter shown in FIG. FIG. 8 is a schematic diagram showing an example of optical wavelength address conversion in the usage example shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The “private network” in the following description should be understood most widely as an optical network including a virtual private network, and the “optical gateway device” is provided at the edge of the private network and enters and exits the private network. This corresponds to an optical communication processing device that processes signals to be transmitted.

1. Optical Network System As shown in FIG. 1, an optical WDM network system to which the present invention is applied comprises a plurality of

private networks

10a, 10b, 10c,... And a public network 20 to which they are connected. The basic configuration is a passive optical network (WDM-PON) of wavelength division multiplexing. Hereinafter, the private network 10a will be exemplified and described in detail. It is assumed that the downstream wavelength λ _AD and the upstream wavelength λ _AU are assigned to the private network 10 a for communication with the public network 20.

The optical gateway device 11 connected to the public network 20 is provided at the edge of the private network 10a, and the optical gateway device 11 is provided with the optical wavelength address conversion unit 100 according to the present invention. The optical wavelength address conversion unit 100 is preferably provided in the optical gateway device 11 provided at the edge of the private network 10a.

As will be described later, the optical wavelength address converter 100 converts the downstream wavelength λ _AD into n different downstream wavelengths λ _1D -λ _nD used in the private network 10a, and n used in the private network 10a. The different upstream wavelengths λ _1U -λ _nU are converted to upstream wavelength λ _AU . The downstream wavelengths λ _1D -λ _nD and the upstream wavelengths λ _1U -λ _nU used in the private network 10a can be assigned to the terminal devices T1-Tn, respectively. The conversion contents in the optical wavelength address conversion unit 100 can be monitored and updated by the monitoring control system 13 of the private network 10a. The supervisory control system 13 can perform supervisory control of the optical wavelength address converter 100 locally as shown in FIG. 1, but remote supervisory control via a network may also be used.

The optical wavelength router 12 separates and transmits the downstream wavelengths λ _1D -λ _nD to the corresponding terminal devices, multiplexes the upstream wavelengths λ _1U -λ _nU from the terminal devices T ₁ _-Tn , and forwards them to the optical gateway device 11. To do. When the downstream wavelengths λ _1D -λ _nD and the upstream wavelengths λ _1U -λ _nU used in the private network 10a are associated with each of the terminal devices T1-Tn, these wavelengths are designated as “private wavelength addresses”. That's it.

As described above, the downstream wavelengths λ _1D -λ _nD and the upstream wavelengths λ _1U -λ _nU are defined for use in the private network 10 a in the optical gateway device 11. Therefore, the wavelength used in the private network 10a can be determined independently of the wavelengths used in the public network 20 and other private networks, and a finite number of WDM wavelengths are repeatedly assigned in a plurality of private networks. WDM wavelength resources can be used effectively. Hereinafter, the optical wavelength address conversion unit 100 of the optical gateway device 11 provided in each private network will be described in detail.

2. Optical wavelength allocation The optical wavelength address converter 100 includes a downstream optical wavelength address converter 100DL shown in FIG. 2 and an upstream optical wavelength address converter 100UL shown in FIG.
2.1) Downlink Optical Wavelength Allocation FIG. 2 shows the downstream optical wavelength address conversion unit 100DL of the optical gateway apparatus 11 showing the processing of signals from the public network 20 toward the private network 10. The downstream optical wavelength address conversion unit 100DL is provided with an optical / electrical conversion unit (O / E) 101 and a separation unit 102. The O / E 101 converts a downstream optical signal having a wavelength λ _D obtained by multiplexing signals addressed to a plurality of terminal devices accommodated by the private network into an electrical signal, and the separation unit 102 converts the received electrical signal into a main signal addressed to the terminal device. To separate. The individual main signals separated by the separation unit 102 are input to the corresponding electrical / optical conversion units (E / O) 104-1 to 104-n through the control information monitoring unit 103 and used in the private network. Each is converted into an optical main signal having a downstream wavelength λ _1D -λ _nD . These optical main signals are multiplexed by the optical wavelength multiplexer 105 and sent to the optical wavelength router 12.

The control information monitoring unit 103 uses the address and control information (for example, MAC address, VLAN identification information, public network side IP address (global IP address), TCP / UDP port number, etc.) from the individual main signal separated by the separation unit 102. Is output to the control unit 106. The control unit 106 refers to the downstream optical wavelength address conversion table 107 using the acquired address and control information, and controls each transmission wavelength of the E / Os 104-1 to 104-n. For example, if the transmission destination of the main signal input to the E / O 104-1 is the terminal device T1, the E / O 104-1 is controlled to emit light at the downstream wavelength λ _1D assigned to the terminal device T1. Further, if a plurality of downstream wavelengths (for example, λ _1D and λ _2D ) are assigned to the terminal device T1, a plurality of main signals are transmitted to the terminal device T1 by emitting a plurality of E / Os at these wavelengths, respectively. It is also possible.

Note that each of the E / Os 104-1 to 104-n may be a light source that can change the emission wavelength in accordance with a control signal from the control unit 106, or the light emission wavelength is fixed to λ _1D -λ _nD. It may be a single light source.

The downstream optical wavelength address conversion table 107 provides a means for converting the downstream wavelength λ _D on the public network side into n different downstream wavelengths λ _1D -λ _nD used in the private network. It may be fixed or may change over time (dynamic). In addition to wavelength conversion, IP address conversion can also be provided. The downstream optical wavelength address conversion table 107 is monitored and controlled by the monitoring control system 13.

2.2) Uplink Optical Wavelength Allocation FIG. 3 shows the upstream optical wavelength address conversion unit 100UL of the optical gateway apparatus 11 showing the processing of signals from the private network 10 to the public network 20. The upstream optical wavelength address converter 100UL is provided with an optical wavelength separator 201 and optical / electrical converters (O / E) 202-1 to 202-n. The optical wavelength demultiplexing unit 201 demultiplexes the upstream wavelength multiplexed signal received from the optical wavelength router 12 into n different upstream wavelengths λ _1U -λ _nU used in the private network, and O / E 202-1 to 202-n _Converts upstream optical signals of wavelengths λ _1U -λ _nU into electrical signals, respectively. The main signal converted into an electric signal is input to the multiplexing unit 204 through the control information monitoring unit 203, are electrically multiplexed by multiplexing section 204, the electric / optical converter section (E / O) 205 of the upstream wavelength lambda _U light It is converted into a main signal and sent to the public network 20.

The control information monitoring unit 203 converts the address and control information (for example, MAC address, VLAN identification information, public network side IP address (global IP address)) from the individual main signals converted into electric signals by the O / Es 202-1 to 202-n. ), TCP / UDP port number, etc.) are acquired and output to the control unit 206. The control unit 206 controls the transmission wavelength of the E / O 205 with reference to the upstream optical wavelength address conversion table 207.

The upstream optical wavelength address conversion table 207 provides means for converting n different upstream wavelengths λ _1U -λ _nU used in the private network into upstream wavelengths λ _U on the public network side, but this correspondence is fixed. Or dynamic. In addition to wavelength conversion, IP address conversion may be provided. The upstream optical wavelength address conversion table 207 is monitored and controlled by the monitoring control system 13.

The downstream optical wavelength address conversion unit 100DL shown in FIG. 2 and the upstream optical wavelength address conversion unit 100UL shown in FIG. 3 are provided in one optical gateway device 11 to perform wavelength conversion of optical signals entering and exiting the private network. it can. At that time, the

control units

106 and 206 can be realized by one gateway control unit, and the downstream optical wavelength address conversion table 107 and the upstream optical wavelength address conversion table 207 are stored in a storage means that can be referred to by the gateway control unit. Can do.

For the control unit 106 that controls the downstream wavelength address conversion and the control unit 206 (or the gateway control unit) that controls the upstream wavelength address conversion, the program stored in the recording medium is a program control processor such as a CPU (Central Processing Unit). An equivalent function can be realized by executing the above.

3. Embodiment As shown in FIG. 4, it is assumed that three private networks A, B, and C are connected to a public network 20. The public network 20 uses WDM-PON and has an OLT (Optical Line Termination) 21 as a station apparatus and an AWG (Array Waveguide Grating) 22 as an optical wavelength router. Downlink wavelengths λ _AD , λ _BD , and λ _CD separated by the AWG 22 are assigned to the private networks A, B, and C, respectively. The wavelength assignment by the public network may be fixed or dynamic. AWG is a passive device that performs wavelength allocation and multiplexing, and is used in WDM-PON.

Private networks A, B, and C are also configured by WDM-PON. Here, since it corresponds to the

private networks

10a, 10b, and 10c shown in FIG. 1, suffixes a, b, and c are added to the reference numerals in FIG. However, AWG is used for the optical wavelength router 12, and the terminal device is an ONU (Optical Network Unit). The

optical gateway devices

11a, 11b, and 11c installed at the edges of the private networks A, B, and C are devices that realize wavelength address conversion according to this embodiment. The optical wavelength address converter (100a, 100b, 100c) of the optical gateway device (11a, 11b, 11c) has a block configuration equivalent to the downstream and upstream optical wavelength address converters shown in FIGS. 2 and 3, respectively. To do.

As shown in FIG. 5, the downstream optical wavelength address conversion table 107 of the optical gateway device 11a provides a correspondence for converting the downstream wavelength λ _AD to the downstream wavelengths λ _1D -λ _3D used in the private network A. The downstream optical wavelength address conversion table 107 of the device 11b provides a correspondence for converting the downstream wavelength λ _BD to downstream wavelengths λ _1D -λ _3D used in the private network B, and the downstream optical wavelength address conversion table of the optical gateway device 11c. 107 provides a correspondence to convert the downstream wavelength λ _CD to the downstream wavelengths λ _1D -λ _3D used in the private network C.

In this way, the wavelengths in each private network can be determined independently of the wavelengths used in the public network 20 and other private networks, so the same downstream wavelength (here, λ _1D -λ _3D ) is set to a plurality of wavelengths. It can be used repeatedly in a private network. In FIG. 5, in the downstream optical wavelength address conversion table in each private network, a private IP address is also assigned to each terminal device (ONU) in the private network.

As shown in FIG. 6, the upstream optical wavelength address conversion table 207 of the optical gateway device 11a provides a correspondence for converting the upstream wavelengths λ _1U -λ _3U used in the private network A to the upstream wavelength λ _AU . The upstream optical wavelength address conversion table 207 of the device 11b provides a correspondence for converting the upstream wavelengths λ _1U -λ _3U used in the private network B to the upstream wavelength λ _BU, and the upstream optical wavelength address conversion table of the optical gateway device 11c. 207 provides a correspondence for converting the upstream wavelengths λ _1U -λ _3U used in the private network C to the upstream wavelength λ _CU . In this way, the wavelength used in each private network can be determined independently of the wavelength used in the public network 20 and other private networks, so the same upstream wavelength (here, λ _1U -λ _3U ) is set. It is possible to repeatedly assign within multiple private networks.

As described above, the public network 20 assigns reception and transmission optical wavelengths to the

optical gateway devices

11a, 11b, and 11c. This assignment may be fixed or performed dynamically. However, a different wavelength is assigned to each optical gateway device in order to perform wavelength multiplexing. A wavelength assigned from the public network side to the optical gateway device of each private network is called a global wavelength address.

Each optical gateway device assigns a wavelength for transmission and reception to a plurality of terminal devices ONU connected in the private network. A wavelength allocated from the optical gateway device to the terminal device ONU in the private network is called a private wavelength address.

Describing downstream wavelength address conversion with reference to FIG. 2, an optical signal received from the public network 20 is converted into an electric signal by the O / E 101 and separated into a signal to each terminal apparatus ONU by the separation unit 102. The control information monitoring unit 103 obtains address and control information (for example, MAC address, VLAN, public network side IP address (global IP address), TCP / IP port number, etc. as shown in FIG. 5) from these separated signals. To do. Upon receiving these pieces of information, the control unit 106 refers to the wavelength address conversion table 107 shown in FIG. 5 to determine the wavelength to be assigned to each terminal apparatus ONU on the private network side, and transmits it in the E / Os 104-1 to 104-3. Control the wavelength. The outputs from the E / Os 104-1 to 104-3 are multiplexed into one optical signal by the optical wavelength multiplexing unit 105 and sent to the terminal device side.

The upstream wavelength address conversion will be described with reference to FIG. 3. The optical wavelength demultiplexing unit 201 demultiplexes the optical signal received from the terminal device side for each wavelength, and each of them is converted into an electric signal by the O / Es 202-1 to 202-3. Converted. The control signal monitoring unit 203 obtains address and control information (for example, MAC address, VLAN, public network side IP address (global IP address), TCP / IP port number, etc. as shown in FIG. 5) from these separated signals. To do. Upon receiving these pieces of information, the control unit 206 refers to the wavelength address conversion table 207 to determine the wavelength to be transmitted to the public network side, and controls the transmission wavelength in the E / O 205. Each electric signal is bundled by the multiplexing unit 204 and transmitted to the public network side via the E / O 205. The contents of the wavelength address conversion table are set in the optical gateway device locally or remotely from the supervisory control system 13 of the private network.

4). As described above, according to this embodiment, it is possible to assign a wavelength (private wavelength address) to be used in each private network independently from the wavelength (global wavelength address) assigned from the public network. In addition, the wavelength resources can be used effectively and flexibly. For example, a wavelength address used in a public network can be freely used in a private network.

Also, in each optical gateway device, the wavelength allocation in the private network is determined by referring to the optical wavelength address conversion table, so by rewriting the optical wavelength address conversion table as desired by the user by the supervisory control system, There is also an advantage that it is easy to select optical signals of a plurality of wavelengths received through the public network for each terminal.

Furthermore, re-setting is unnecessary even if the terminal device moves by associating the private wavelength address with the MAC address, VLAN, public network side IP address (global IP address), TCP / IP port number, etc. Convenience in network maintenance is also improved. Furthermore, there is an effect that the security is improved by the conversion of the wavelength address.

5). 2. Usage Example In the downstream optical wavelength address conversion unit shown in FIG. 2, the control unit 106 can determine the wavelength allocation in the private network by referring to the downstream optical wavelength address conversion table 107. By rewriting 107, the change of the service provider and the change of the provided service can be easily executed.

For example, as shown in FIG. 7, there are a plurality of service providers SP _A , SP _B , and SP _C in the public network 20 (see FIG. 4), and the service provider SP _A has different wavelengths λ ₁ for voice, data, and video services. -Λ ₃ is provided, service provider SP _B provides them using wavelengths λ ₄ -λ ₆ , service provider SP _C provides them using wavelengths λ ₇ -λ ₉ , and each terminal device ONU provides WDM. It is assumed that it corresponds.

In this case, as shown in FIG. 8, the contents of the downstream optical wavelength address conversion table 107 for a certain end user are changed from the global wavelength addresses λ ₃ , λ ₅ , λ ₇ to the private wavelength addresses λ ₁ , λ ₂ , λ ₃ , respectively. It is easy to select three services from a plurality of services provided by three service providers simply by rewriting them so as to convert them. In the example shown in FIG. 7, the video service is selected from the service provider SP _A , the data service is selected from the service provider SP _B, and the voice service is selected from the service provider SP _C.

6). Other Embodiments In the above-described embodiments, an example based on the PON has been shown. However, the optical wavelength address conversion according to the present invention can be applied to other WDM network configurations (for example, P2P, rings, etc.). Also, there may be a plurality of wavelengths (global wavelength addresses) assigned from the public network to the optical gateway device.

7). Additional Notes Part or all of the above-described embodiments may be described as the following additional notes, but are not limited thereto.

(Appendix 1)
An optical communication processing apparatus for processing an optical signal entering and exiting an optical network of a wavelength division multiplexing (hereinafter referred to as WDM) system,
Association means for associating at least one external wavelength assigned to the optical network from an external network and a plurality of internal wavelengths used independently in the optical network;
Wavelength converting means for performing wavelength conversion between the external wavelength and the plurality of internal wavelengths according to the association;
An optical communication processing device comprising:

(Appendix 2)
The optical communication processing apparatus according to appendix 1, wherein the association unit further sets the allocation of the plurality of internal wavelengths to a plurality of terminal apparatuses accommodated in the optical network.

(Appendix 3)
The optical communication processing device according to attachment 2, wherein the association and / or the assignment can be changed.

(Appendix 4)
The association means includes a correspondence between the external wavelength and the plurality of internal wavelengths, a correspondence between the plurality of internal wavelengths and information for identifying a plurality of terminal devices accommodated in the optical network, 4. The optical communication processing device according to any one of appendices 1-3, further including a wavelength address conversion table for setting the address to be changeable.

(Appendix 5)
The wavelength converting means is
Optical / electrical conversion means for converting the optical signal of the external wavelength into an electrical signal;
Separating means for separating signals addressed to a plurality of terminal devices multiplexed on the electrical signal;
A plurality of electrical / optical conversion means for generating optical signals of the plurality of internal wavelengths according to the signals addressed to the plurality of terminal devices;
A multiplexing means for multiplexing the optical signals of the plurality of internal wavelengths into one optical signal;
Control means for controlling the transmission wavelengths of the plurality of electrical / optical conversion means according to the correspondence;
The optical communication processing device according to any one of appendixes 1-4, characterized by comprising:

(Appendix 6)
The external network is a public network, the optical network is a private network, and the public network and the private network are passive optical networks using WDM, according to any one of appendix 1-5, Optical communication processing device.

(Appendix 7)
A wavelength conversion method in a wavelength division multiplexing (WDM) optical network,
Associating at least one external wavelength assigned to the optical network from an external network with a plurality of internal wavelengths used independently in the optical network;
Performing wavelength conversion between the external wavelength and the plurality of internal wavelengths according to the association;
The wavelength conversion method characterized by the above-mentioned.

(Appendix 8)
The wavelength conversion method according to appendix 7, wherein the association further sets assignment of the plurality of internal wavelengths to a plurality of terminal devices accommodated in the optical network.

(Appendix 9)
The wavelength conversion method according to appendix 8, wherein the association and / or the assignment can be changed.

(Appendix 10)
The association includes a correspondence between the external wavelength and the plurality of internal wavelengths, and a correspondence between the plurality of internal wavelengths and information for identifying a plurality of terminal devices accommodated in the optical network. The wavelength conversion method according to any one of appendixes 7-9, wherein the wavelength address conversion table is set to be changeable.

(Appendix 11)
The wavelength conversion is
An optical / electrical conversion means converts the optical signal of the external wavelength into an electrical signal;
Separating means separates signals destined for a plurality of terminal devices multiplexed on the electrical signal,
A plurality of electrical / optical conversion means respectively generate optical signals of the plurality of internal wavelengths in accordance with signals addressed to the plurality of terminal devices,
Multiplexing means multiplexes the optical signals of the plurality of internal wavelengths into one optical signal,
A control unit controls transmission wavelengths of the plurality of electrical / optical conversion units according to the correspondence;
Item 11. The wavelength conversion method according to any one of Appendices 7-10, wherein:

(Appendix 12)
An optical network system comprising a wavelength division multiplexing (hereinafter referred to as WDM) public network and a plurality of private networks connected to the public network,
Each of the plurality of private networks is provided with an optical gateway device at a connection point with the public network,
The optical gateway device is
Association means for associating at least one external wavelength assigned from the public network and a plurality of internal wavelengths used independently in the private network;
Wavelength converting means for performing wavelength conversion between the external wavelength and the plurality of internal wavelengths according to the association;
An optical network system comprising:

(Appendix 13)
13. The optical network system according to appendix 12, wherein the associating unit further sets allocation of the plurality of internal wavelengths to a plurality of terminal devices accommodated in the private network.

(Appendix 14)
14. The optical network system according to appendix 13, wherein the association and / or the assignment can be changed.

(Appendix 15)
The association means includes a correspondence between the external wavelength and the plurality of internal wavelengths, a correspondence between the plurality of internal wavelengths and information for identifying a plurality of terminal devices accommodated in the private network, 15. The optical network system according to any one of appendices 12-14, further comprising a wavelength address conversion table for setting the address to be changeable.

(Appendix 16)
The wavelength converting means is
Optical / electrical conversion means for converting the optical signal of the external wavelength into an electrical signal;
Separating means for separating signals addressed to a plurality of terminal devices multiplexed on the electrical signal;
A plurality of electrical / optical conversion means for generating optical signals of the plurality of internal wavelengths according to the signals addressed to the plurality of terminal devices;
A multiplexing means for multiplexing the optical signals of the plurality of internal wavelengths into one optical signal;
Control means for controlling the transmission wavelengths of the plurality of electrical / optical conversion means according to the correspondence;
16. The optical network system according to any one of appendices 12-15, characterized by comprising:

(Appendix 17)
17. The optical network system according to any one of appendix 12-16, wherein the public network and the private network are passive optical networks using WDM.

(Appendix 18)
An optical gateway device including the optical communication processing device according to any one of appendix 1-6.

(Appendix 19)
A program for functioning a program control processor of an optical communication processing device that processes an optical signal entering and exiting an optical network of a wavelength division multiplexing (WDM) system,
A function of associating at least one external wavelength assigned to the optical network from an external network with a plurality of internal wavelengths used independently in the optical network;
A function of performing wavelength conversion between the external wavelength and the plurality of internal wavelengths according to the association;
Is realized by the program control processor.

(Appendix 20)
The program according to appendix 19, wherein the association further sets assignment of the plurality of internal wavelengths to a plurality of terminal devices accommodated in the optical network.

The present invention can be applied to an optical network system employing WDM-PON.

10a, 10b, 10c Private network 11 Optical gateway device 12 Optical wavelength router (AWG)
13 Monitoring and Control System 20 Public Network 101 Optical / Electric Conversion Unit 102 Separation Unit 103 Control Information Monitoring Units 104-1 to 104-n Electric / Optical Conversion Unit 105 Optical Wavelength Multiplexing Unit 106 Control Unit 107 Downlink Optical Wavelength Address Conversion Unit 201 Light Wavelength separation units 202-1 to 202-n Optical / electrical conversion unit 203 Control information monitoring unit 204 Multiplexing unit 205 Electric / optical conversion unit 206 Control unit 207 Upstream optical wavelength address conversion unit

Claims

An optical communication processing apparatus for processing an optical signal entering and exiting an optical network of a wavelength division multiplexing (hereinafter referred to as WDM) system,
Association means for associating at least one external wavelength assigned to the optical network from an external network and a plurality of internal wavelengths used independently in the optical network;
Wavelength converting means for performing wavelength conversion between the external wavelength and the plurality of internal wavelengths according to the association;
An optical communication processing device comprising:
The optical communication processing device according to claim 1, wherein the association unit further sets the allocation of the plurality of internal wavelengths to the plurality of terminal devices accommodated in the optical network.
3. The optical communication processing device according to claim 2, wherein the association and / or the assignment can be changed.
The association means includes a correspondence between the external wavelength and the plurality of internal wavelengths, a correspondence between the plurality of internal wavelengths and information for identifying a plurality of terminal devices accommodated in the optical network, The optical communication processing device according to claim 1, further comprising: a wavelength address conversion table for setting the address to be changeable.
The wavelength converting means is
Optical / electrical conversion means for converting the optical signal of the external wavelength into an electrical signal;
Separating means for separating signals addressed to a plurality of terminal devices multiplexed on the electrical signal;
A plurality of electrical / optical conversion means for generating optical signals of the plurality of internal wavelengths according to the signals addressed to the plurality of terminal devices;
A multiplexing means for multiplexing the optical signals of the plurality of internal wavelengths into one optical signal;
Control means for controlling the transmission wavelengths of the plurality of electrical / optical conversion means according to the correspondence;
The optical communication processing device according to claim 1, further comprising:
6. The external network is a public network, the optical network is a private network, and the public network and the private network are passive optical networks using WDM. Optical communication processing device.
A wavelength conversion method in a wavelength division multiplexing (WDM) optical network,
Associating at least one external wavelength assigned to the optical network from an external network with a plurality of internal wavelengths used independently in the optical network;
Performing wavelength conversion between the external wavelength and the plurality of internal wavelengths according to the association;
The wavelength conversion method characterized by the above-mentioned.
The wavelength conversion method according to claim 7, wherein the association further sets assignment of the plurality of internal wavelengths to a plurality of terminal devices accommodated in the optical network.
An optical network system comprising a wavelength division multiplexing (hereinafter referred to as WDM) public network and a plurality of private networks connected to the public network,
Each of the plurality of private networks is provided with an optical gateway device at a connection point with the public network,
The optical gateway device is
Association means for associating at least one external wavelength assigned from the public network and a plurality of internal wavelengths used independently in the private network;
Wavelength converting means for performing wavelength conversion between the external wavelength and the plurality of internal wavelengths according to the association;
An optical network system comprising:
A program for functioning a program control processor of an optical communication processing device that processes an optical signal entering and exiting an optical network of a wavelength division multiplexing (WDM) system,
A function of associating at least one external wavelength assigned to the optical network from an external network with a plurality of internal wavelengths used independently in the optical network;
A function of performing wavelength conversion between the external wavelength and the plurality of internal wavelengths according to the association;
Is realized by the program control processor.