Wavelength division multiplexing transmission system, wavelength division multiplexing transmission apparatus and method for controlling wavelength division multiplexing transmission apparatus

• US 20060216028A1
• Filed: 03/28/2006
• Published: 09/28/2006
• Est. Priority Date: 03/28/2005
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Ozawa, Kimio
• Granted Patent: US 7,747,164 B2
• Time in Patent Office: Days
• US Class Current: 398/79
• CPC Class Codes: H04B 10/07 Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
• CPC Class Codes: H04B 10/0775 Performance monitoring and measurement of transmission parameters
• CPC Class Codes: H04J 14/0227 Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
• CPC Class Codes: H04J 14/0241 Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
• CPC Class Codes: H04J 14/028 WDM bus architectures
• CPC Class Codes: H04J 14/0294 Dedicated protection at the optical channel (1+1)
• CPC Class Codes: H04J 14/0295 Shared protection at the optical channel (1:1, n:m)
• CPC Class Codes: H04J 14/0297 Optical equipment protection

Abstract

A wavelength division multiplexing transmission system that comprises an input/output terminal station for an optical signal, and an intermediate station located between the terminal stations and connected by an optical transmission line for performing wavelength division multiplexing and transmission of the optical signal, wherein the signal transmission system comprising the terminal station and the intermediate station has a redundant configuration comprising the active system and standby system, and an input/output means for the optical signal to be transmitted through the active system and the standby system is provided on both the active system and the standby system on the side of the active system of the terminal station.

Claims

1. A wavelength division multiplexing transmission system comprising input/output terminal stations for an optical signal and an intermediate station located between said terminal stations and connected through an optical transmission line for performing wavelength division multiplexing and transmission of said optical signal,

wherein a signal transmission system comprising said terminal stations and said intermediate station has a redundant configuration comprising an active system station and a standby system station,

wherein said input/output means for the optical signal is provided on both said active system and said standby system, on the side of said active system of said terminal stations.

2. The wavelength division multiplexing transmission system as set forth in claim 1,

wherein said terminal stations and said intermediate station comprise a plurality of wavelength division multiplexing transmission apparatuses, each comprising said active system and said standby system.

3. The wavelength division multiplexing transmission system as set forth in claim 1, comprising

a control unit for controlling the clock synchronization of optical signal transmission on the said active system or said standby system, based on the prescribed control information set based on said redundant configuration, through said input/output means.

4. The wavelength division multiplexing transmission system as set forth in claim 1,

wherein said terminal stations and said intermediate station comprise a plurality of wavelength division multiplexing transmission apparatuses, each comprising said active system and said standby system, and

comprising a control unit for controlling the clock synchronization of the optical signal transmission on the said active system or said standby system, based on the prescribed control information set based on said redundant configuration, through said input/output means.

5. A wavelength division multiplexing transmission system having terminal stations for entering/delivering an optical signal and performing wavelength division multiplexing and transmission of said optical signal,

wherein a signal transmission system comprising said terminal stations has a redundant configuration comprising an active system and a standby system,

wherein said input/output means for the optical signal is provided on both said active system and said standby system, on the side of said active system of said terminal stations.

6. The wavelength division multiplexing transmission system as set forth in claim 5, comprising

a control unit for controlling the clock synchronization of the optical signal transmission on the said active system or said standby system, based on the prescribed control information set based on said redundant configuration, through said input/output means.

7. The wavelength division multiplexing transmission system as set forth in claim 6,

wherein said control unit synchronizes the clock signal between said active system and said standby system

based on control information determined for each of the wavelength division multiplexing transmission apparatus of said terminal station and the wavelength division multiplexing transmission apparatus of said intermediate station of said active system and said standby system,

including positional information indicating where the wavelength division multiplexing transmission apparatus of said terminal station and the wavelength division multiplexing transmission apparatus of said intermediate station are positioned, connection information indicating the connection relationship of the optical signal transmission in the upstream or the downstream direction, and clock information indicating the master-slave relationship of the base clock signal, which is to be the basis of the clock synchronization.

8. The wavelength division multiplexing transmission system as set forth in claim 5,

wherein, in the wavelength division multiplexing transmission apparatus of said intermediate station, multiple wavelength number information indicating the number of multiple wavelengths of said optical signal contained in said optical signal to be transmitted is transmitted to said downstream wavelength division multiplexing transmission apparatus through a transmission bus different from the transmission line for the optical signal.

9. The wavelength division multiplexing transmission system as set forth in claim 5, comprising

a control unit for controlling the clock synchronization of the optical signal transmission on the said active system or said standby system, based on the prescribed control information set based on said redundant configuration, through said input/output means,

wherein, in the wavelength division multiplexing transmission apparatus of said intermediate station, multiple wavelength number information indicating the number of multiple wavelengths of said optical signal contained in said optical signal to be transmitted is transmitted to said downstream wavelength division multiplexing transmission apparatus through a transmission bus different from the transmission line for the optical signal.

10. The wavelength division multiplexing transmission system as set forth in claim 6,

wherein said control unit synchronizes the clock signal between said active system and said standby system

based on control information determined for each of the wavelength division multiplexing transmission apparatus of said terminal station and the wavelength division multiplexing transmission apparatus of said intermediate station of said active system and said standby system,

including positional information indicating where the wavelength division multiplexing transmission apparatus of said terminal station and the wavelength division multiplexing transmission apparatus of said intermediate station are positioned, connection information indicating the connection relationship of the optical signal transmission in the upstream or the downstream direction, and clock information indicating the master-slave relationship of the base clock signal, which is to be the basis of the clock synchronization,

wherein, in the wavelength division multiplexing transmission apparatus of said intermediate station, multiple wavelength number information indicating the number of multiple wavelengths of said optical signal contained in said optical signal to be transmitted is transmitted to said downstream wavelength division multiplexing transmission apparatus through a transmission bus different from the transmission line for the optical signal.

11. The wavelength division multiplexing transmission system as set forth in claim 8, wherein

the wavelength division multiplexing transmission apparatus of said intermediate station comprises an external communication interface unit for entering/delivering said multiple wavelength number information.

12. The wavelength division multiplexing transmission system as set forth in claim 8, wherein

said communication bus for transmitting said multiple wavelength number information between the wavelength division multiplexing transmission apparatuses of said intermediate station is configured by an optical patch cord or an electrical cable.

13. The wavelength division multiplexing transmission system as set forth in claim 8,

wherein the wavelength division multiplexing transmission apparatus of said intermediate station comprises an external communication interface unit for entering/delivering said multiple wavelength number information,

wherein said communication bus for transmitting said multiple wavelength number information between the wavelength division multiplexing transmission apparatuses of said intermediate station is configured by an optical patch cord or an electrical cable.

14. The wavelength division multiplexing transmission system as set forth in claim 8,

wherein the number of multiple wavelengths of the optical signal transmitted between the wavelength division multiplexing transmission apparatuses of said intermediate station is determined based on said multiple wavelength number information and the power level of the optical signal from which said multiple wavelength number information has been extracted.

15. The wavelength division multiplexing transmission system as set forth in claim 8,

wherein the wavelength division multiplexing transmission apparatus of said intermediate station comprises an external communication interface unit for entering/delivering said multiple wavelength number information,

wherein the number of multiple wavelengths of the optical signal transmitted between the wavelength division multiplexing transmission apparatuses of said intermediate station is determined based on said multiple wavelength number information and the power level of the optical signal from which said multiple wavelength number information has been extracted.

16. The wavelength division multiplexing transmission system as set forth in claim 8,

wherein said communication bus for transmitting said multiple wavelength number information between the wavelength division multiplexing transmission apparatuses of said intermediate station is configured by an optical patch cord or an electrical cable,

wherein the number of multiple wavelengths of the optical signal transmitted between the wavelength division multiplexing transmission apparatuses of said intermediate station is determined based on said multiple wavelength number information and the power level of the optical signal from which said multiple wavelength number information has been extracted.

17. A wavelength division multiplexing transmission apparatus comprising input/output terminal stations for an optical signal, and performing wavelength division multiplexing and transmission of said optical signal,

wherein a signal transmission system comprising said terminal stations has a redundant configuration comprising an active system station and a standby system station,

wherein said input/output means for an optical signal to be transmitted through said active system or said standby system is provided on both said active system and said standby system, on the side of said active system of said terminal stations.

18. The wavelength division multiplexing transmission apparatus as set forth in claim 17,

wherein said terminal station comprises a plurality of wavelength division multiplexing transmission means, each comprising said active system and said standby system.

19. The wavelength division multiplexing transmission apparatus as set forth in claim 17, comprising

a control unit for controlling the clock synchronization of the optical signal transmission on the said active system or said standby system, based on the prescribed control information set based on said redundant configuration, through said input/output means.

20. The wavelength division multiplexing transmission apparatus as set forth in claim 17,

wherein said terminal station comprises a plurality of wavelength division multiplexing transmission means, each comprising said active system and said standby system, and

comprising a control unit for controlling the clock synchronization of the optical signal transmission on the said active system or said standby system, based on the prescribed control information set based on said redundant configuration, through said input/output means.

21. A method for controlling a wavelength division multiplexing transmission apparatus comprising input/output terminal stations for an optical signal, and performing wavelength division multiplexing and transmission of said optical signal, comprising steps of:

rendering a signal transmission system comprising said terminal stations a redundant configuration comprising an active system and a standby system, and providing said input/output means for the optical signal on both said active system and said standby system, on the side of said active system of said terminal station, and

controlling the clock synchronization of the optical signal transmission on the said active system or said standby system, based on the prescribed control information set based on said redundant configuration, through said input/output means.

22. The method for controlling the wavelength division multiplexing transmission apparatus as set forth in claim 21, comprising the step of:

synchronizing the clock signal of said active system and said standby system

based on control information determined for each of the wavelength division multiplexing transmission apparatus of said terminal station and the wavelength division multiplexing transmission apparatus of said intermediate station of said active system and said standby system,

including positional information indicating where the wavelength division multiplexing transmission apparatus of said terminal station and the wavelength division multiplexing transmission apparatus of said intermediate station are positioned, connection information indicating the connection relationship of the optical signal transmission in the upstream or the downstream direction, and clock information indicating the master-slave relationship of the base clock signal, which is to be the basis of the clock synchronization.

23. The method for controlling the wavelength division multiplexing transmission apparatus as set forth in claim 21, comprising the step of:

in the wavelength division multiplexing transmission apparatus of said intermediate station, transmitting multiple wavelength number information indicating the number of the multiple wavelengths of said optical signal contained in said optical signal to be transmitted to said downstream wavelength division multiplexing transmission apparatus through a transmission bus different from the transmission line of said optical signal.

24. The method for controlling the wavelength division multiplexing transmission apparatus as set forth in claim 21, comprising the steps of:

synchronizing the clock signal of said active system and said standby system

based on control information determined for each of the wavelength division multiplexing transmission apparatus of said terminal station and the wavelength division multiplexing transmission apparatus of said intermediate station of said active system and said standby system,

including positional information indicating where the wavelength division multiplexing transmission apparatus of said terminal station and the wavelength division multiplexing transmission apparatus of said intermediate station are positioned, connection information indicating the connection relationship of the optical signal transmission in the upstream or the downstream direction, and clock information indicating the master-slave relationship of the base clock signal, which is to be the basis of the clock synchronization, and

in the wavelength division multiplexing transmission apparatus of said intermediate station, transmitting multiple wavelength number information indicating the number of the multiple wavelengths of said optical signal contained in said optical signal to be transmitted to said downstream wavelength division multiplexing transmission apparatus through a transmission bus different from the transmission line of said optical signal.

25. The method for controlling the wavelength division multiplexing transmission apparatus as set forth in claim 23, comprising the step of:

determining the number of multiple wavelengths of the optical signal transmitted between the wavelength division multiplexing transmission apparatuses of said intermediate station based on said multiple wavelength number information and the power level of the optical signal from which said multiple wavelength number information has been extracted.