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WO2021120203A1 - 一种海底光缆系统 - Google Patents

一种海底光缆系统 Download PDF

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Publication number
WO2021120203A1
WO2021120203A1 PCT/CN2019/127132 CN2019127132W WO2021120203A1 WO 2021120203 A1 WO2021120203 A1 WO 2021120203A1 CN 2019127132 W CN2019127132 W CN 2019127132W WO 2021120203 A1 WO2021120203 A1 WO 2021120203A1
Authority
WO
WIPO (PCT)
Prior art keywords
trunk
optical fiber
transmission channel
service
branch
Prior art date
Application number
PCT/CN2019/127132
Other languages
English (en)
French (fr)
Inventor
许昌武
马立苹
王燕
Original Assignee
华为海洋网络有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为海洋网络有限公司 filed Critical 华为海洋网络有限公司
Priority to CN201980102158.0A priority Critical patent/CN114902584B/zh
Priority to PCT/CN2019/127132 priority patent/WO2021120203A1/zh
Priority to JP2022537859A priority patent/JP7383157B2/ja
Publication of WO2021120203A1 publication Critical patent/WO2021120203A1/zh
Priority to US17/841,149 priority patent/US20220308301A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/0213—Groups of channels or wave bands arrangements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/444—Systems or boxes with surplus lengths
    • G02B6/4452—Distribution frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4415—Cables for special applications
    • G02B6/4427—Pressure resistant cables, e.g. undersea cables
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects
    • H04Q2011/0052—Interconnection of switches

Definitions

  • This application relates to the field of submarine optical cable communication, and in particular to a submarine optical cable system.
  • the optical fibers in the submarine optical cable exist in pairs. For the land end station of each submarine optical cable communication system, one optical fiber in the pair of optical fibers is used to send optical signals to the opposite land end station, and the other optical fiber It is used to receive the optical signal sent by the land end station of the opposite end.
  • the submarine optical cable trunk is generally connected to multiple branch sites for uploading or downloading services.
  • each member of the submarine optical cable alliance purchases an independent optical fiber pair, and each member's business can only allocate bandwidth within the optical fiber pair purchased by itself.
  • For a tributary site with busy business many members need to perform service transmission with the site, so the site needs to configure a tributary fiber connected to each member's fiber pair.
  • arranging branch optical fibers for each group of optical fiber pairs will result in higher complexity of the submarine optical cable system.
  • the embodiment of the present application provides a submarine optical cable system, which reduces the complexity of the submarine optical cable system.
  • an embodiment of the present application provides a submarine optical cable system, including: a first trunk site, a second trunk site, a branch site, a first optical cross-connect (OXC) device, and a second trunk site.
  • OXC equipment, trunk optical fiber assembly and branch optical fiber One end of the first OXC equipment is connected to the first trunk site through the trunk optical fiber assembly, and the other end of the first OXC equipment is connected to the second OXC equipment through the trunk optical fiber assembly.
  • One end of the second OXC device is connected to the second trunk site through a trunk optical fiber assembly.
  • the trunk optical fiber assembly includes at least the first trunk optical fiber and the second trunk optical fiber.
  • the branch site is connected to the second trunk optical fiber through the branch optical fiber.
  • each trunk fiber has a corresponding transmission channel set for transmitting services, that is, the first trunk fiber has a corresponding first transmission channel set, and the second trunk fiber has a corresponding second transmission channel.
  • Set, and the service transmitted by each transmission channel uniquely corresponds to the transmission channel;
  • the first trunk site is used to send the first service through the first transmission channel in the first transmission channel set, and to send the second service through the second transmission channel in the second transmission channel set;
  • the first OXC device is used to send the first service through the second transmission channel in the second transmission channel set;
  • One transmission channel is transferred to the second trunk optical fiber;
  • the branch site is used to upload or download the first service and the second service through the second trunk optical fiber;
  • the second OXC equipment is used to transfer the transferred first transmission channel to the second A trunk optical fiber;
  • the second trunk site is used to receive the first service through the first transmission channel, and to receive the second service through the second transmission channel.
  • the first OXC device can transfer the first transmission channel in the first transmission channel set corresponding to the first trunk fiber to the second trunk fiber.
  • the optical fiber is connected to the first trunk optical fiber, and the service originally transmitted in the first trunk optical fiber can still be uploaded or downloaded through the branch optical fiber connected to the second trunk optical fiber. That is to say, based on the submarine optical cable system of the present application, the branch site only needs to be connected to one of the trunk optical fibers in the trunk optical fiber set to upload or download any service transmitted in the trunk optical fiber set.
  • the branch site is equipped with multiple branch optical fibers, which reduces the complexity of the submarine optical cable system.
  • the first OXC device can transfer the first transmission channel by means of transmission channel exchange, that is, the first OXC device can transfer the first transmission channel and the second transmission channel set.
  • the third transmission channel is exchanged.
  • the second OXC device can exchange the first transmission channel after the exchange and the third transmission channel after the exchange again.
  • the first transmission channel set is the first spectral bandwidth corresponding to the first trunk fiber
  • the first spectral bandwidth includes N spectral subbands, where N is an integer greater than 1
  • the first The first spectral subband in the spectral bandwidth is used to transmit the first service
  • the second transmission channel set is the second spectral bandwidth corresponding to the second trunk fiber.
  • the second spectral bandwidth includes M spectral subbands, where M is greater than 1. Integer, the second spectral subband in the second spectral bandwidth is used to transmit the second service;
  • the first OXC device exchanges the first spectral subband and the third spectral subband in the second spectral bandwidth.
  • the wavelength range of the first spectral subband is the same as the wavelength range of the third spectral subband; the second OXC device exchanges The first spectral subband after the exchange and the third spectral subband after the exchange are exchanged again;
  • the first OXC device can add the first spectral subband to the second spectral bandwidth, and the second OXC device can add the first spectral subband to the second spectral bandwidth. Shift back to the first spectral bandwidth.
  • different services occupy the spectral subbands of different trunk fibers, and the different services are combined and transmitted in a trunk fiber through the exchange or transfer of the spectral subbands, which has high practical value.
  • each spectral subband in the first spectral bandwidth may include one wavelength value or multiple wavelength values; similarly, each spectral subband in the second spectral bandwidth
  • the band can include one wavelength value or multiple wavelength values.
  • the wavelength range of each spectral sub-band can be the same (equal division) or different (non-equal division).
  • the first transmission channel set is a first core set included in the first trunk optical fiber, the first core set includes N cores, and the first core set in the first core set One core is used to transmit the first service
  • the second transmission channel set is the second core set included in the second trunk fiber, the second core set includes M cores, M is an integer greater than 1, and the second fiber The second core in the core set is used to transmit the second service;
  • the first OXC device exchanges the first core and the third core in the second core set; the second OXC device exchanges the exchanged first core and the exchanged third core again.
  • the first OXC device adds the first core to the second trunk fiber; the second OXC device transfers the first core back to the first trunk fiber.
  • each trunk optical fiber may also be a multi-core optical fiber, and different services are combined and transmitted in a trunk optical fiber through core exchange or transfer, which makes the scope of application of this solution wider.
  • the first trunk site includes at least a first terminal and a second terminal
  • the second trunk site includes at least a third terminal and a fourth terminal
  • the branch site includes at least a fifth terminal.
  • the first terminal is used to send the first service through the first transmission channel; the second terminal is used to send the second service through the second transmission channel; the fifth terminal is used to upload or download the second service through the second transmission channel, and through the second transmission channel.
  • a transmission channel uploads or downloads the first service; the third terminal is used to receive the first service through the first transmission channel; the fourth terminal is used to receive the second service through the second transmission channel.
  • multiple terminals may be set in each trunk road site, and different terminals specifically transmit different services, which improves the practicability of the solution.
  • the trunk optical fiber set further includes a third trunk optical fiber, and the third trunk optical fiber corresponds to the third transmission channel set;
  • the first trunk site is also used to send the third service through the fourth transmission channel in the third transmission channel set; the first OXC device is also used to transfer the fourth transmission channel to the second trunk fiber; the branch site also uses For uploading or downloading the third service through the second trunk optical fiber; the second OXC device is used to transfer the transferred fourth transmission channel to the third trunk optical fiber; the second trunk site is used to receive the third service through the fourth transmission channel Three business.
  • the solution is not limited to a submarine optical cable system with two trunk optical fibers. On this basis, it can also support more trunk optical fibers, converging the services transmitted in different trunk optical fibers into one of them. On the trunk optical fiber, this solution is more scalable.
  • the first trunk optical fiber is one of the optical fibers in the first trunk optical fiber pair
  • the second trunk optical fiber is one of the optical fibers in the second trunk optical fiber pair.
  • each trunk optical fiber exists in a pair, and one of the optical fibers in the optical fiber pair is used for receiving and the other is used for transmitting, which makes this solution more practical.
  • the submarine optical cable system further includes a branching unit (BU), which is arranged between the first OXC device and the second OXC device, and the BU also includes an optical switch, an optical switch Set on the second trunk fiber between the first OXC device and the second OXC device, the branch fiber is connected to the second trunk fiber between the first OXC device and the second OXC device through an optical switch;
  • BU branching unit
  • the optical switch is used to switch the first service and the second service to the branch fiber for transmission.
  • a BU including an optical switch may also be provided on the trunk fiber between the first OXC device and the second OXC device, which improves the scalability of the solution.
  • the submarine optical cable system further includes a reconfigurable optical add-drop multiplexer (ROADM) device, and one end of the ROADM device is connected to the branch site through a branch optical fiber , The other end of the ROADM device is connected to the second trunk fiber between the first OXC device and the second OXC device through a branch fiber;
  • ROADM reconfigurable optical add-drop multiplexer
  • ROADM equipment is used to download the second service to the branch site through the branch fiber, and download the first service to the branch site through the branch fiber;
  • the ROADM device is used to upload the second service from the branch site through the branch optical fiber, and upload the first service from the branch site through the branch optical fiber.
  • a ROADM device may also be provided on the branch optical fiber, and the branch site can select the services that need to be downloaded through the ROADM device, and the processing is more flexible.
  • the submarine optical cable system further includes at least one repeater, and the repeater is arranged on the trunk optical fiber assembly between the first OXC device and the second OXC device, or the relay The device is installed on the branch optical fiber;
  • the repeater is used to amplify the optical signal sent by the first trunk site, and the first service and the second service are transmitted in the form of optical signals;
  • the repeater is used to amplify the optical signal sent by the branch site.
  • a repeater may be provided on the trunk optical fiber between the first OXC device and the second OXC device, which further improves the scalability of the solution.
  • the fiber types of the trunk fiber and branch fiber in the trunk fiber set include single mode fiber (Single Mode Fiber, SMF) and multimode fiber (Multi Mode Fiber, MMF). Or Multicore Fiber (MCF), etc.
  • the branch site may also be connected to the first trunk optical fiber between the first OXC device and the second OXC device through another branch optical fiber.
  • the branch site may also be connected to different trunk optical fibers through multiple branch optical fibers.
  • the first OXC device can transfer the interrupted service to another trunk fiber for transmission, and then the branch site can pass through and Another intact branch optical fiber connected to another trunk optical fiber downloads the service.
  • the interrupted service can still be guaranteed to be transmitted normally.
  • embodiments of the present application provide a submarine optical fiber cable system, including: a first trunk site, a second trunk site, a first optical crossover OXC device, a second OXC device, and a trunk optical fiber assembly.
  • One end of an OXC device is connected to the first trunk site through a trunk fiber assembly
  • the other end of the first OXC device is connected to one end of the second OXC device through a trunk fiber assembly
  • the other end of the second OXC device is connected through a trunk fiber
  • the assembly is connected to the second trunk site.
  • the trunk optical fiber set includes at least a first trunk optical fiber and a second trunk optical fiber.
  • the first trunk optical fiber has a corresponding first transmission channel set
  • the second trunk optical fiber has a corresponding first transmission channel set.
  • the first trunk site is used to send the first service through the first transmission channel in the first transmission channel set, and to send the second service through the second transmission channel in the second transmission channel set;
  • the first OXC device is used to send the first service through the second transmission channel in the second transmission channel set;
  • One transmission channel is transferred to the second trunk optical fiber;
  • the second OXC equipment is used to transfer the transferred first transmission channel to the first trunk optical fiber;
  • the second trunk site is used to receive the first service through the first transmission channel, And receive the second service through the second transmission channel.
  • the first OXC device can transfer the first transmission channel in the first transmission channel set corresponding to the first trunk optical fiber to the second trunk optical fiber.
  • the site is not connected to the first trunk fiber via the branch fiber, and can still upload or download the services originally transmitted in the first trunk fiber via the branch fiber connected to the second trunk fiber. That is to say, based on the submarine optical cable system of the present application, the branch site only needs to be connected to one of the trunk optical fibers in the trunk optical fiber set to upload or download any service transmitted in the trunk optical fiber set, and there is no need for
  • the branch site is equipped with multiple branch optical fibers, which reduces the complexity of the submarine optical cable system.
  • Figure 1 is a schematic diagram of an existing submarine optical cable system
  • Figure 2 is a schematic diagram of a submarine optical cable system provided by this application.
  • Figure 3 is a schematic diagram of optical fiber pairs in a submarine optical cable
  • FIG. 4 is a schematic diagram of another submarine optical cable system provided by this application.
  • Figure 5 is a schematic diagram of shifting spectral subbands by OXC equipment
  • Figure 6 is a schematic diagram of a spectral bandwidth divided into spectral subbands
  • Fig. 7 is a schematic diagram of fiber core transfer by OXC equipment
  • Fig. 8 is a schematic diagram of another submarine optical cable system provided by this application.
  • the embodiment of the application provides a submarine optical fiber cable system.
  • the branch site only needs to be connected to one of the trunk fibers in the trunk optical fiber set to upload or download any service transmitted in the trunk optical fiber set.
  • the branch site is equipped with multiple branch optical fibers, which reduces the complexity of the submarine optical cable system.
  • the terms "first”, “second”, “third”, “fourth”, etc. (if any) in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects, without having to use To describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in a sequence other than the content illustrated or described herein.
  • FIG. 1 is a schematic diagram of an existing submarine optical cable system.
  • Site A and Site B are trunk sites, and Site C is a branch site.
  • Site A and site B are connected by a trunk fiber
  • site C is connected with a trunk fiber by a branch fiber.
  • multiple optical fibers may be connected between site A and site B, and each site may be provided with multiple terminals, and each optical fiber is independent of each other and bandwidth is not shared.
  • each optical fiber only transmits the service of a certain customer. For example, the first service is transmitted between the terminal A1 and the terminal B1 through the first trunk optical fiber, and the first service is transmitted between the terminal A2 and the terminal B2 through the second trunk optical fiber.
  • both the first service and the second service may also need to be transmitted to site C, then terminal C1 needs to be connected to the first trunk fiber via the first branch fiber, and terminal C2 needs to be connected via the second branch fiber To the second trunk fiber, and each branch fiber is also configured with a reconfigurable optical add-drop multiplexer (ROADM) device, which is used to download services from the trunk fiber or upload services To the trunk optical fiber.
  • ROADM reconfigurable optical add-drop multiplexer
  • this application provides a new type of submarine optical cable system, which can effectively reduce the complexity of the submarine optical cable system.
  • FIG. 2 is a schematic diagram of a submarine optical cable system provided by this application.
  • the submarine optical cable system includes: a first trunk site 101, a second trunk site 102, a branch site 103, a first optical cross-connect (OXC) device 104, a second OXC device 105, and a trunk fiber assembly 106 and branch fiber 107.
  • the first trunk site 101 is connected to one end of the first OXC device 104 through the trunk fiber assembly 106
  • the other end of the first OXC device 104 is connected to one end of the second OXC device 105 through the trunk fiber assembly 106
  • the second The other end of the OXC device 105 is connected to the second trunk site 102 through the trunk fiber assembly 106.
  • the trunk optical fiber assembly 106 includes at least a first trunk optical fiber 106a and a second trunk optical fiber 106b.
  • the branch site 103 passes through the branch optical fiber assembly 107 and the second trunk between the first OXC device 104 and the second OXC device 105.
  • the optical fiber 106b is connected.
  • Each trunk optical fiber has a corresponding transmission channel set for transmitting services, that is, the first trunk optical fiber 106a corresponds to the first transmission channel set, the second trunk optical fiber 106b corresponds to the second transmission channel set, and each The service transmitted by the transmission channel uniquely corresponds to the transmission channel.
  • the transmission channel may be a spectral subband divided by the spectral bandwidth of the optical fiber, each spectral subband includes one or more wavelengths, and each transmission channel may include one or more spectral subbands. If each trunk fiber is a multi-core fiber, the transmission channel can also be the core of the multi-core fiber. The different types of transmission channels will be further described below.
  • the first OXC device 104 is installed in the first arterial site 101
  • the second OXC device 105 is installed in the second arterial site 102.
  • multiple terminals may be provided in the first trunk site 101 and the second trunk site 102, and different terminals are used to send different services.
  • the first arterial site 101 includes at least a first terminal 101a and a second terminal 101b
  • the second arterial site 102 includes at least a third terminal 102a and a fourth terminal 102b
  • the branch site 103 includes at least a fifth terminal 103a.
  • the first terminal 101a and the third terminal 102a collectively transmit services through the first transmission channel
  • the second terminal 101b and the fourth terminal 102b collectively transmit services through the second transmission channel.
  • each of the foregoing terminals may specifically be Terminal Transmission Equipment (TTE).
  • TTE Terminal Transmission Equipment
  • the first terminal 101a transmits the first service through the first transmission channel in the first transmission channel set.
  • the second terminal 101b sends the second service through the second transmission channel in the second transmission channel set.
  • the first OXC device 104 moves the first transmission channel to the second trunk optical fiber 106b. In other words, after processing by the first OXC device 104, the first service originally transmitted on the first trunk optical fiber 106a will be transferred to the second trunk optical fiber 106b for transmission.
  • the fifth terminal 103a can upload or download the first service and the second service through the second trunk optical fiber 106b.
  • the second OXC device 105 can transfer the first transmission channel that has been transferred to the second trunk fiber 106b back to the first trunk fiber 106a.
  • the third terminal 102a is the opposite device of the first terminal 101a
  • the fourth terminal 102b is the opposite device of the second terminal 101b.
  • the first terminal 101a and the third terminal 102a are equipment of company A
  • the second terminal 101b and the fourth terminal 102b are equipment of company B
  • the interface (Interoperable reference point Interface, IPI) of company A can only identify the first Business
  • the IPI of Company B can only identify the second business. Therefore, before the first service is transmitted to the second site 102, the second OXC device 105 needs to transfer the first transmission channel back to the first trunk optical fiber 106a.
  • the third terminal 102a receives the first service through the first transmission channel
  • the fourth terminal 102b receives the second service through the second transmission channel. It can be understood that in practical applications, the third terminal 102a and the fourth terminal 102b can also be used as service transmitters, and the first terminal 101a and the second terminal 101b can be used as service receivers, which is not specifically limited here.
  • FIG. 3 is a schematic diagram of optical fiber pairs in a submarine optical cable.
  • a set of fiber pair refers to two optical fibers connected to the receiving port and the transmitting port of a communication transmission equipment (line transmission equipment, LTE). The two optical fibers form a communication link for receiving and transmitting. .
  • Different fiber pairs are kept isolated from each other, that is, there is no physical connection between different fiber pairs. That is, the aforementioned first trunk optical fiber 106a is one of the optical fibers in the first trunk optical fiber pair, and the second trunk optical fiber 106b is one of the optical fibers in the second trunk optical fiber pair.
  • the branch optical fiber set 107 is also an optical fiber pair, in which one optical fiber is used for uploading services, and the other optical fiber is used for downloading services.
  • the submarine optical cable system may further include a branching unit (BU) 108, which is arranged on the trunk optical fiber assembly 106 and located between the first OXC device 104 and the second OXC device 105.
  • the branch device 108 is also equipped with an optical switch 108a.
  • the optical switch 108a is arranged on the second trunk optical fiber 106b, and the branch optical fiber assembly 107 is connected to the second trunk optical fiber through the optical switch 108a.
  • the optical switch 108a can switch the first service and the second service to the branch optical fiber assembly 107 for transmission.
  • the submarine optical cable system may further include ROADM equipment 109.
  • One end of the ROADM device 109 is connected to the fifth terminal 103a through the branch optical fiber assembly 107, and the other end of the ROADM device 109 is connected to the optical switch 108a on the second trunk optical fiber 106b through the branch optical fiber assembly 107.
  • the ROADM device 109 can download services from the second trunk optical fiber 106b to the fifth terminal 103a through the branch optical fiber assembly 107, or upload services to the second trunk optical fiber 106b through the branch optical fiber assembly 107.
  • the ROADM device 109 is configured to select from the services transmitted by the second trunk optical fiber 106b according to actual needs. Download business. If all the services transmitted in the second trunk optical fiber 106b need to be downloaded to the branch site 103, then the ROADM device 109 may not be configured.
  • the submarine optical cable system may further include at least one repeater (Repeater) 110, where the repeater 110 may be provided on the trunk optical fiber assembly 106 between the first OXC device 104 and the branch device 108.
  • the services sent by the first trunk site 101 to the second trunk site 102 are all transmitted in the trunk optical fiber assembly 106 in the form of optical signals.
  • the repeater 110 may amplify the optical signal sent by the first trunk site 101 to the second trunk site 102.
  • the repeater 110 may also be set on the trunk optical fiber assembly 106 between the second OXC device 105 and the branch device 108, and is used to perform the optical signal transmission from the second trunk site 102 to the first trunk site 101. enlarge.
  • the repeater 110 can also be set on the branch optical fiber assembly 107 between the branch site 103 and the ROADM device 109, and is used to connect the branch site 103 to the first trunk site 101 or the second trunk site 102.
  • the transmitted optical signal is amplified.
  • the types of the trunk fiber and branch fiber may include single mode fiber (SMF), multimode fiber (MMF), or multicore fiber (MCF), etc. There is no limitation here.
  • SMF single mode fiber
  • MMF multimode fiber
  • MCF multicore fiber
  • the trunk fiber set 106 may also include more trunk fibers. Then, referring to the implementation of the foregoing embodiment, the third station 103 may also receive more trunk fibers through the branch fiber set 107. Business from other trunk optical fibers.
  • FIG. 4 is a schematic diagram of another submarine optical cable system provided by this application.
  • the trunk optical fiber set 106 may also include a third trunk optical fiber 106c, and the third trunk optical fiber 106c has a corresponding third transmission channel set.
  • the sixth terminal 101c in the first trunk site 101 can also send the third service through one of the transmission channels in the third transmission channel set.
  • the first OXC device 104 may also transfer the transmission channel used for transmitting the third service to the second trunk optical fiber 106b.
  • the fifth terminal 103a can upload or download the third service through the second trunk optical fiber 106b.
  • the second OXC device 105 can also transfer the transmission channel back to the third trunk optical fiber 106c.
  • the seventh terminal 102c in the second trunk site 102 may also receive the third service through the transmission channel. It can be understood that the number of trunk fibers in the trunk fiber set 106 is subject to actual applications, and is not specifically limited here.
  • the set of transmission channels corresponding to each trunk fiber is the spectral bandwidth of each trunk fiber.
  • the spectral bandwidth of each trunk fiber can be divided into multiple spectral subbands, and different spectral subbands transmit different services. .
  • Figure 5 is a schematic diagram of the OXC device shifting the spectral subbands.
  • the first spectral bandwidth of the first trunk fiber 106a includes a total of N spectral subbands from the wavelength ⁇ 1 to the wavelength ⁇ n
  • the second spectral bandwidth of the second trunk fiber 106b also includes a total of N spectral subbands from ⁇ 1 to ⁇ n.
  • the first service and the second service are transmitted in the form of optical signals
  • the demultiplexer 104a can demultiplex the optical signals transmitted in the first trunk optical fiber 106a to obtain spectral subbands ⁇ 1 to ⁇ n, where, The first service occupies the spectral subband ⁇ 2 in the first spectral bandwidth.
  • the demultiplexer 104b can demultiplex the optical signal transmitted in the second trunk fiber 106b to obtain spectral subbands ⁇ 1 to ⁇ n, where the second service occupies the spectral subband ⁇ 1 in the second spectral bandwidth.
  • the spectral subbands occupied by each customer's business can be agreed in advance. For example, whether it is the first spectral bandwidth of the first trunk fiber 106a or the second spectral bandwidth of the second trunk fiber 106b, the spectral sub-band ⁇ 1 is used to transmit the second service, and the spectral sub-band ⁇ 2 is used to transmit the second service.
  • the bandwidth allocated for each customer's business is no longer limited to a certain fiber pair, but the spectral bandwidth of all fiber pairs is divided into multiple spectral subbands, and bandwidth is uniformly allocated for each customer's business.
  • the first OXC device 104 exchanges the spectral subband ⁇ 2 in the first spectral bandwidth and the spectral subband ⁇ 2 in the second spectral bandwidth. Furthermore, the multiplexer 104c multiplexes the optical signals in each spectral subband after the exchange and couples them to the first trunk optical fiber 106a. In the same way, the multiplexer 104d multiplexes the optical signals in each spectral subband after the exchange and couples them to the second trunk optical fiber 106b. It can be seen that after the first service originally transmitted on the first trunk optical fiber 106a is processed by the first OXC device 104, the first service is transferred to the second trunk optical fiber 106b for transmission.
  • the processing method of the second OXC device 105 is similar to that of the first OXC device 104.
  • the second OXC device exchanges the spectral subband ⁇ 2 in the first spectral bandwidth and the spectral subband ⁇ 2 in the second spectral bandwidth again, namely can.
  • the first spectral bandwidth of the first trunk fiber 106a and the second spectral bandwidth of the second trunk fiber 106a may include the same spectral subband.
  • the first spectral bandwidth and the second spectral bandwidth may both include There are 100 spectral subbands from ⁇ 1 to ⁇ 100.
  • the first spectral bandwidth and the second spectral bandwidth include different spectral subbands.
  • the first spectral bandwidth includes 20 spectral subbands from ⁇ 1 to ⁇ 20
  • the second spectral bandwidth includes 30 spectral subbands from ⁇ 21 to ⁇ 50. Spectral subbands.
  • the first OXC device 104 can perform the above-described method for the same spectral subbands in the first spectral bandwidth and the second spectral bandwidth. Bring to exchange. If the first spectral bandwidth and the second spectral bandwidth include different spectral subbands, the first OXC device 104 transfers the spectral subband used to transmit the first service to the second spectral bandwidth, for example, the original second spectral bandwidth The bandwidth includes spectral subbands ⁇ 21 to ⁇ 50. After processing by the first OXC device 104, ⁇ 2 is added to the second spectral bandwidth.
  • each spectral subband in the spectral bandwidth may include one wavelength value, or may include multiple wavelength values.
  • Figure 6 is a schematic diagram of a spectral bandwidth divided into spectral subbands.
  • the spectral bandwidth includes wavelength ⁇ 1 to wavelength ⁇ 100, wavelength ⁇ 1 to wavelength ⁇ 10 corresponds to one spectral subband, wavelength ⁇ 11 to wavelength ⁇ 20 corresponds to one spectral subband, and so on, the spectral bandwidth is divided into 10 spectral subbands.
  • each wavelength may correspond to a spectral subband.
  • the wavelength range of each spectral sub-band can be the same (equal division) or different (non-equal division), and the specifics are not limited here.
  • each trunk fiber is a multi-core fiber, and each fiber core corresponds to a transmission channel.
  • Figure 7 is a schematic diagram of the OXC device transferring the core.
  • the first trunk optical fiber 106a includes a total of N cores from core 1 to core n
  • the second trunk optical fiber 106b also includes a total of N cores from core 1 to core n.
  • the fan-out (FAN-out) module 104e strips the N cores in the first trunk optical fiber 106a, and the fan-out module 104f strips the N cores in the second trunk optical fiber 106b.
  • the core 2 in the first trunk optical fiber 106a is used to transmit the first service
  • the core 1 in the second trunk optical fiber 106b is used to transmit the second service.
  • the first OXC device 104 can exchange the core 2 in the first trunk optical fiber 106a and any core except the core 1 in the second trunk optical fiber 106b. Furthermore, the fan-in (FAN-in) module 104g merges the exchanged core into the first trunk optical fiber 106a. Similarly, the fan-in module 104h merges the exchanged core into the second trunk optical fiber 106b. Through the exchange of cores, the first service originally transmitted in the first trunk optical fiber 106a will be transferred to the second trunk optical fiber 106b for transmission.
  • the processing method of the second OXC device 105 is similar to that of the first OXC device 104, and the second OXC device only needs to exchange the two fiber cores previously exchanged back.
  • the first OXC device 104 may also add the core 2 in the first trunk optical fiber 106a to the second trunk optical fiber 106b, and the original core in the second trunk optical fiber 106b remains unchanged. After that, the second OXC device 105 transfers the core 2 added to the second trunk optical fiber 106b back to the first trunk optical fiber 106a.
  • the number of cores in the first trunk optical fiber 106a and the second trunk optical fiber 106b may be the same or different, which is not specifically limited here.
  • the first OXC device can transfer the first transmission channel in the first transmission channel set corresponding to the first trunk optical fiber to the second trunk optical fiber.
  • the site is not connected to the first trunk fiber via the branch fiber, and can still upload or download the services originally transmitted in the first trunk fiber via the branch fiber connected to the second trunk fiber. That is to say, based on the submarine optical cable system of the present application, the branch site only needs to be connected to one of the trunk optical fibers in the trunk optical fiber set to upload or download any service transmitted in the trunk optical fiber set, and there is no need for
  • the branch site is equipped with multiple branch optical fibers, which reduces the complexity of the submarine optical cable system.
  • FIG. 8 is a schematic diagram of another submarine optical cable system provided by this application. It can be seen that the difference from the submarine optical cable system shown in FIG. 2 is that the eighth terminal 103b in the branch site 103 is connected to the first trunk optical fiber 106a through another branch optical fiber 111.
  • an optical switch 108b may also be configured in the branch device 108, wherein the optical switch 108b is disposed on the first trunk optical fiber 106a.
  • a ROADM device 112 may also be provided on the branch optical fiber 111.
  • the first service sent by the first terminal 101a is transmitted in the first trunk optical fiber 106a, and the optical switch 108b can switch the first service to the branch optical fiber 111 for transmission.
  • the ROADM device 112 can download the first service to the eighth terminal 103b through the branch optical fiber 111.
  • the first OXC device 104 can transfer the first service originally transmitted on the first trunk fiber 106a to It is transmitted in the second trunk optical fiber 106b to ensure that the first service can be transmitted to the branch site 103 normally.

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Abstract

一种海底光缆系统，降低了海底光缆系统的复杂度。海底光缆系统包括：第一干路站点（101）、第二干路站点（102）、支路站点（103）、第一OXC设备（104）、第二OXC设备（105）、干路光纤集合（106）和支路光纤（107），其中，干路光纤集合（106）至少包括第一干路光纤（106a）和第二干路光纤（106b），支路站点（103）通过支路光纤（107）与第一OXC设备（104）和第二OXC设备（105）之间的第二干路光纤（106b）相连；第一干路站点（101）通过第一传输通道集合中的第一传输通道发送第一业务，并通过第二传输通道集合中的第二传输通道发送第二业务；第一OXC设备（104）将第一传输通道转移至第二干路光纤（106b）；支路站点（103）通过第二干路光纤（106b）上载或下载第一业务和第二业务；第二OXC设备（105）将转移后的第一传输通道转移至第一干路光纤（106a）。

Description

一种海底光缆系统 技术领域
本申请涉及海底光缆通信领域，尤其涉及一种海底光缆系统。
背景技术
海底光缆中的光纤以成对的方式存在，对每个海底光缆通信系统的陆地端站来说，成对光纤中的一根光纤用于发送光信号到对端的陆地端站，另一根光纤用于接收对端的陆地端站发送的光信号。
在海底光缆系统中，海底光缆干路一般连接多个支路站点，用于实现业务的上载或下载。通常的，海底光缆联盟每个成员购买独立的光纤对，每个成员的业务只能在自己购买的光纤对内分配带宽。对于业务繁忙的支路站点，很多成员都需要与该站点进行业务传输，那么该站点需要为每个成员的光纤对都分别配置与之相连的支路光纤。然而，为每组光纤对都配置支路光纤将导致海底光缆系统的复杂度较高。
发明内容
本申请实施例提供了一种海底光缆系统，降低了海底光缆系统的复杂度。
第一方面，本申请实施例提供了一种海底光缆系统，包括：第一干路站点、第二干路站点、支路站点、第一光交叉(Optical cross-connect，OXC)设备、第二OXC设备、干路光纤集合和支路光纤，其中，第一OXC设备的一端通过干路光纤集合与第一干路站点相连，第一OXC设备的另一端通过干路光纤集合与第二OXC设备的一端相连，第二OXC设备的另一端通过干路光纤集合与第二干路站点相连，干路光纤集合至少包括第一干路光纤和第二干路光纤，支路站点通过支路光纤与第一OXC设备和第二OXC设备之间的第二干路光纤相连；
具体地，每一路干路光纤都具有与之对应的用于传输业务的传输通道集合，即第一干路光纤具有对应的第一传输通道集合，第二干路光纤具有对应的第二传输通道集合，并且每个传输通道所传输的业务与该传输通道唯一对应；
第一干路站点用于通过第一传输通道集合中的第一传输通道发送第一业务，并通过第二传输通道集合中的第二传输通道发送第二业务；第一OXC设备用于将第一传输通道转移至第二干路光纤；支路站点用于通过第二干路光纤上载或下载第一业务和第二业务；第二OXC设备用于将转移后的第一传输通道转移至第一干路光纤；第二干路站点用于通过第一传输通道接收第一业务，并通过第二传输通道接收第二业务。
在该实施方式中，第一OXC设备可以将第一干路光纤对应的第一传输通道集合中的第一传输通道转移至第二干路光纤，这样一来，虽然支路站点没有通过支路光纤与第一干路光纤相连，仍然可以通过与第二干路光纤相连的支路光纤上载或下载原本在第一干路光纤中传输的业务。也就是说，基于本申请的海底光缆系统，支路站点只需要与干路光纤集合中的其中一路干路光纤相连即可实现对干路光纤集合中传输的任意业务进行上载或下载， 无需为支路站点配置多条支路光纤，降低了海底光缆系统的复杂度。
可选地，在一些可能的实施方式中，第一OXC设备可以通过传输通道交换的方式对第一传输通道进行转移，即第一OXC设备可以对第一传输通道和第二传输通道集合中的第三传输通道进行交换。相应的，第二OXC设备可以对交换后的第一传输通道和交换后的第三传输通道再进行一次交换。
在该实施方式中，提供了一种通过传输通道交换来将第一传输通道转移至第二干路光纤的实施方式，提高了本方案的可实现性。另外，也可以不通过交换直接将第一传输通道转移到第二干路光纤，扩展了本方案的实现方式。
可选地，在一些可能的实施方式中，第一传输通道集合为第一干路光纤对应的第一光谱带宽，第一光谱带宽包括N个光谱子带，N为大于1的整数，第一光谱带宽中的第一光谱子带用于传输第一业务，第二传输通道集合为第二干路光纤对应的第二光谱带宽，第二光谱带宽包括M个光谱子带，M为大于1的整数，第二光谱带宽中的第二光谱子带用于传输第二业务；
第一OXC设备对第一光谱子带和第二光谱带宽中的第三光谱子带进行交换，第一光谱子带的波长范围与第三光谱子带的波长范围相同；第二OXC设备对交换后的第一光谱子带和交换后的第三光谱子带再进行一次交换；
或者，若第一光谱带宽与第二光谱带宽对应的波长范围并不相同，那么第一OXC设备可以将第一光谱子带添加至第二光谱带宽，第二OXC设备再将第一光谱子带转移回第一光谱带宽。
在该实施方式中，不同的业务占用不同干路光纤的光谱子带，通过光谱子带的交换或转移将不同的业务汇合在一路干路光纤中传输，实用价值较高。
可选地，在一些可能的实施方式中，第一光谱带宽中的每个光谱子带可以包括一个波长值，也可以包括多个波长值；同理，第二光谱带宽中的每个光谱子带可以包括一个波长值，也可以包括多个波长值。另外，每个光谱子带的波长范围可以相同(等分)，也可以不同(非等分)。
在该实施方式中，提供了多种光谱子带的划分方式，提高了本方案的灵活性。
可选地，在一些可能的实施方式中，第一传输通道集合为第一干路光纤包括的第一纤芯集合，第一纤芯集合包括N根纤芯，第一纤芯集合中的第一纤芯用于传输第一业务，第二传输通道集合为第二干路光纤包括的第二纤芯集合，第二纤芯集合包括M根纤芯，M为大于1的整数，第二纤芯集合中的第二纤芯用于传输第二业务；
第一OXC设备对第一纤芯和第二纤芯集合中的第三纤芯进行交换；第二OXC设备对交换后的第一纤芯和交换后的第三纤芯再进行一次交换。
或者，第一OXC设备将第一纤芯添加至第二干路光纤；第二OXC设备再将第一纤芯转移回第一干路光纤。
在该实施方式中，各干路光纤还可以是多芯光纤，通过纤芯的交换或转移将不同的业务汇合在一路干路光纤中传输，使得本方案的适用范围更广。
可选地，在一些可能的实施方式中，第一干路站点至少包括第一终端和第二终端，第 二干路站点至少包括第三终端和第四终端，支路站点至少包括第五终端；
第一终端用于通过第一传输通道发送第一业务；第二终端用于通过第二传输通道发送第二业务；第五终端用于通过第二传输通道上载或下载第二业务，并通过第一传输通道上载或下载第一业务；第三终端用于通过第一传输通道接收第一业务；第四终端用于通过第二传输通道接收第二业务。
在该实施方式中，各干路站点中可以设置有多个终端，具体由不同的终端发送不同的业务，提高了本方案的实用性。
可选地，在一些可能的实施方式中，干路光纤集合还包括第三干路光纤，第三干路光纤对应第三传输通道集合；
第一干路站点还用于通过第三传输通道集合中的第四传输通道发送第三业务；第一OXC设备还用于将第四传输通道转移至第二干路光纤；支路站点还用于通过第二干路光纤上载或下载第三业务；第二OXC设备用于将转移后的第四传输通道转移至第三干路光纤；第二干路站点用于通过第四传输通道接收第三业务。
在该实施方式中，本方案并不局限于两路干路光纤的海底光缆系统，在此基础上还可以支持更多的干路光纤，将不同干路光纤中传输的业务都汇合到其中一路干路光纤上，使得本方案更具有扩展性。
可选地，在一些可能的实施方式中，第一干路光纤为第一干路光纤对中的其中一路光纤，第二干路光纤为第二干路光纤对中的其中一路光纤。
在该实施方式中，每路干路光纤都是以成对的形式存在的，光纤对中的其中一条光纤用于接收，另一条用于发送，使得本方案的实用性更强。
可选地，在一些可能的实施方式中，海底光缆系统还包括分支设备(Branching unit，BU)，分支设备设置于第一OXC设备和第二OXC设备之间，BU还包括光开关，光开关设置于第一OXC设备和第二OXC设备之间的第二干路光纤上，支路光纤通过光开关与第一OXC设备和第二OXC设备之间的第二干路光纤相连；
光开关用于将第一业务和第二业务切换至支路光纤上传输。
在该实施方式中，第一OXC设备和第二OXC设备之间的干路光纤上还可以设置有包括光开关的BU，提高了本方案的扩展性。
可选地，在一些可能的实施方式中，海底光缆系统还包括可重构光分叉复用(Reconfigurable optical add-drop multiplexer，ROADM)设备，ROADM设备的一端通过支路光纤与支路站点相连，ROADM设备的另一端通过支路光纤与第一OXC设备和第二OXC设备之间的第二干路光纤相连；
ROADM设备用于通过支路光纤将第二业务下载至支路站点，并通过支路光纤将第一业务下载至支路站点；
或者，ROADM设备用于通过支路光纤上载来自支路站点的第二业务，并通过支路光纤上载来自支路站点的第一业务。
在该实施方式中，支路光纤上还可以设置有ROADM设备，支路站点可以通过该ROADM设备对需要下载的业务进行选择，处理更灵活。
可选地，在一些可能的实施方式中，海底光缆系统还包括至少一个中继器，中继器设置于第一OXC设备和第二OXC设备之间的干路光纤集合上，或者，中继器设置于支路光纤上；
中继器用于对第一干路站点发送的光信号进行放大，第一业务和第二业务以光信号的形式传输；
或者，中继器用于对支路站点发送的光信号进行放大。
在该实施方式中，第一OXC设备和第二OXC设备之间的干路光纤上还可以设置有中继器，进一步提高了本方案的扩展性。
可选地，在一些可能的实施方式中，干路光纤集合中的干路光纤和支路光纤的光纤类型包括单模光纤(Single Mode Fiber，SMF)、多模光纤(Multi Mode Fiber，MMF)或多芯光纤(Multicore fiber，MCF)等。
在该实施方式中，本方案所采用的光纤的类型可以有很多种，适用范围更广。
可选地，在一些可能的实施方式中，支路站点还可以通过另一条支路光纤与第一OXC设备和第二OXC设备之间的第一干路光纤相连。
在该实施方式中，支路站点也可以通过多条支路光纤分别与不同的干路光纤相连。在这种系统架构中，如果因为某一条支路光纤故障导致的某一路业务中断时，第一OXC设备可以将这一路中断的业务转移至另一条干路光纤中传输，进而支路站点通过与另一条干路光纤连接的另一条完好的支路光纤下载该业务。也就是说，即使某一条支路光纤出现故障，仍然可以保证中断的业务可以正常传输。
第二方面，本申请实施例提供了一种海底光缆系统，包括：第一干路站点、第二干路站点、第一光交叉OXC设备、第二OXC设备和干路光纤集合，其中，第一OXC设备的一端通过干路光纤集合与第一干路站点相连，第一OXC设备的另一端通过干路光纤集合与第二OXC设备的一端相连，第二OXC设备的另一端通过干路光纤集合与第二干路站点相连，干路光纤集合至少包括第一干路光纤和第二干路光纤，第一干路光纤具有对应的第一传输通道集合，第二干路光纤具有对应的第二传输通道集合；
第一干路站点用于通过第一传输通道集合中的第一传输通道发送第一业务，并通过第二传输通道集合中的第二传输通道发送第二业务；第一OXC设备用于将第一传输通道转移至第二干路光纤；第二OXC设备用于将转移后的第一传输通道转移至第一干路光纤；第二干路站点用于通过第一传输通道接收第一业务，并通过第二传输通道接收第二业务。
本申请实施例提供的海底光缆系统中，第一OXC设备可以将第一干路光纤对应的第一传输通道集合中的第一传输通道转移至第二干路光纤，这样一来，虽然支路站点没有通过支路光纤与第一干路光纤相连，仍然可以通过与第二干路光纤相连的支路光纤上载或下载原本在第一干路光纤中传输的业务。也就是说，基于本申请的海底光缆系统，支路站点只需要与干路光纤集合中的其中一路干路光纤相连即可实现对干路光纤集合中传输的任意业务进行上载或下载，无需为支路站点配置多条支路光纤，降低了海底光缆系统的复杂度。
附图说明
图1为现有的一种海底光缆系统的示意图；
图2为本申请提供的一种海底光缆系统的示意图；
图3为海底光缆中光纤对的示意图；
图4为本申请提供的另一种海底光缆系统的示意图；
图5为OXC设备对光谱子带进行转移的示意图；
图6为一种光谱带宽划分为光谱子带的示意图；
图7为OXC设备对纤芯进行转移的示意图；
图8为本申请提供的另一种海底光缆系统的示意图。
具体实施方式
本申请实施例提供了一种海底光缆系统，支路站点只需要与干路光纤集合中的其中一路干路光纤相连即可实现对干路光纤集合中传输的任意业务进行上载或下载，无需为支路站点配置多条支路光纤，降低了海底光缆系统的复杂度。本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的实施例能够以除了在这里图示或描述的内容以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
图1为现有的一种海底光缆系统的示意图。站点A和站点B为干路(trunk)站点，站点C为支路(branch)站点。站点A和站点B之间通过干路光纤相连，站点C通过支路光纤与干路光纤相连。具体地，站点A和站点B之间可以连接有多路光纤，并且每个站点可以设置有多个终端，各路光纤之间相互独立且带宽不共享。通常情况下，每路光纤只传输某一家客户的业务，例如，终端A1和终端B1之间通过第一干路光纤传输第一业务，终端A2和终端B2之间通过第二干路光纤传输第二业务。对于站点C来说，第一业务和第二业务可能也都需要传输到站点C，那么终端C1需要通过第一支路光纤连接到第一干路光纤，终端C2需要通过第二支路光纤连接到第二干路光纤，并且每个支路光纤上还配置有可重构光分叉复用(Reconfigurable optical add-drop multiplexer，ROADM)设备，用于实现从干路光纤下载业务，或上载业务至干路光纤。以第一业务为例，设置在第一光路光纤上的光开关将原本在第一干路光纤上传输的第一业务切换到第一支路光纤，进而，可以通过ROADM将该第一业务下载至终端C1。
从图1所示的海底光缆系统可以看出，需要为站点C配置多条支路光纤分别与对应的干路光纤相连，以使得站点C实现对多路业务的上载或下载。然而，实际应用中可能会有数量繁多的干路光纤，如果为每一路干路光纤都配置与之对应的支路光纤会导致该海底光缆系统的复杂度较高。
为此本申请提供了一种新型的海底光缆系统，可以有效降低海底光缆系统的复杂度。
图2为本申请提供的一种海底光缆系统的示意图。该海底光缆系统包括：第一干路站点101、第二干路站点102、支路站点103、第一光交叉(Optical cross-connect，OXC)设备104、第二OXC设备105、干路光纤集合106和支路光纤107。其中，第一干路站点101通过干路光纤集合106与第一OXC设备104的一端相连，第一OXC设备104的另一端通过干路光纤集合106与第二OXC设备105的一端相连，第二OXC设备105的另一端通过干路光纤集合106与第二干路站点102相连。该干路光纤集合106至少包括第一干路光纤106a和第二干路光纤106b，支路站点103通过支路光纤集合107与第一OXC设备104和第二OXC设备105之间的第二干路光纤106b相连。
每一路干路光纤都具有与之对应的用于传输业务的传输通道集合，即第一干路光纤106a对应第一传输通道集合，第二干路光纤106b对应第二传输通道集合，并且每个传输通道所传输的业务与该传输通道唯一对应。传输通道可以是由光纤的光谱带宽划分得到的光谱子带，每个光谱子带包括一个或多个波长，并且每个传输通道可以包括一个或多个光谱子带。如果每路干路光纤都为多芯光纤，那么传输通道也可以是多芯光纤中的纤芯。下文会对传输通道的不同类型分别进行更进一步的描述。
第一OXC设备104设置于第一干路站点101中，第二OXC设备105设置于第二干路站点102中。另外，第一干路站点101和第二干路站点102中还可以设置有多个终端，不同的终端用于发送不同的业务。例如，第一干路站点101至少包括第一终端101a和第二终端101b，第二干路站点102至少包括第三终端102a和第四终端102b。另外，支路站点103至少包括第五终端103a。第一终端101a和第三终端102a之间通过第一传输通道集合传输业务，第二终端101b和第四终端102b之间通过第二传输通道集合传输业务。需要说明的是，上述各终端具体可以是终端传输设备(Terminal Transmission Equipment，TTE)。
具体地，第一终端101a通过第一传输通道集合中的第一传输通道发送第一业务。第二终端101b通过第二传输通道集合中的第二传输通道发送第二业务。
第一OXC设备104将第一传输通道移至第二干路光纤106b。也就是说，经过第一OXC设备104的处理后，原本在第一干路光纤106a中传输的第一业务将转移到第二干路光纤106b中传输。
由于支路光纤集合107与第二干路光纤106b相连，那么第五终端103a可以通过第二干路光纤106b上载或下载第一业务和第二业务外。
第二OXC设备105可以将已经转移到第二干路光纤106b的第一传输通道再转移回第一干路光纤106a。可以理解的是，第三终端102a是第一终端101a的对端设备，第四终端102b是第二终端101b的对端设备。例如，第一终端101a和第三终端102a是A公司的设备，第二终端101b和第四终端102b是B公司的设备，A公司的接口界面(Interoperable reference point Interface，IPI)只能识别第一业务，B公司的IPI只能识别第二业务。因此，在第一业务传输到第二站点102之前，第二OXC设备105需要将第一传输通道转移回第一干路光纤106a。
第三终端102a通过第一传输通道接收第一业务，第四终端102b通过第二传输通道接收第二业务。可以理解的是，在实际应用中，第三终端102a和第四终端102b也可以作为 业务的发送端，第一终端101a和第二终端101b作为业务的接收端，具体此处不做限定。
需要说明的是，海底光缆中的光纤都是以成对的方式存在。图3为海底光缆中光纤对的示意图。一组光纤对(fiber pair，FP)是指与一个通信传输设备(line transmission equipment，LTE)的接收端口和发送端口相连的两路光纤，这两路光纤组成一路接收、一路发送的通信链路。不同的光纤对之间相互保持隔离，即不同的光纤对之间没有物理连接。也就是说，上述的第一干路光纤106a是第一干路光纤对中的其中一路光纤，第二干路光纤106b是第二干路光纤对中的其中一路光纤。支路光纤集合107也是光纤对，其中一路光纤用于上载业务，另一路光纤用于下载业务。
可选地，该海底光缆系统还可以包括分支设备(Branching unit，BU)108，该分支设备设置于干路光纤集合106上，且位于第一OXC设备104和第二OXC设备105之间。该分支设备108内还配置有光开关108a。其中，光开关108a设置于第二干路光纤106b上，支路光纤集合107通过光开关108a与第二干路光纤相连。该光开关108a可以将第一业务和第二业务切换到支路光纤集合107中传输。
可选地，该海底光缆系统还可以包括ROADM设备109。该ROADM设备109的一端通过支路光纤集合107与第五终端103a相连，该ROADM设备109的另一端通过支路光纤集合107与第二干路光纤106b上的光开关108a相连。该ROADM设备109可以通过支路光纤集合107从第二干路光纤106b下载业务至第五终端103a，也可以通过支路光纤集合107向第二干路光纤106b上载业务。需要说明的是，若第二干路光纤106b中传输的业务多于第三站点103需要下载的业务，则配置ROADM设备109，以根据实际需求从第二干路光纤106b传输的业务中选择需要下载的业务。而若第二干路光纤106b中传输的所有业务都需要下载到支路站点103，那么也可以不配置该ROADM设备109。
可选地，该海底光缆系统还可以包括至少一个中继器(Repeater)110，其中，该中继器110可以设置于第一OXC设备104和分支设备108之间的干路光纤集合106上。具体地，第一干路站点101向第二干路站点102发送的业务都是以光信号的形式在干路光纤集合106中传输。中继器110可以对第一干路站点101向第二干路站点102发送的光信号进行放大。或者，中继器110也可以设置于第二OXC设备105和分支设备108之间的干路光纤集合106上，用于对第二干路站点102向第一干路站点101发送的光信号进行放大。又或者，中继器110还可以设置于支路站点103与ROADM设备109之间的支路光纤集合107上，用于对支路站点103向第一干路站点101或第二干路站点102发送的光信号进行放大。
可选地，上述干路光纤和支路光纤的类型可以包括单模光纤(Single Mode Fiber，SMF)、多模光纤(Multi Mode Fiber，MMF)或多芯光纤(Multicore fiber，MCF)等，具体此处不做限定。
在某些可能的应用场景中，上述干路光纤集合106中还可以包括更多的干路光纤，那么参照上述实施例的实施方式，第三站点103还可以通过支路光纤集合107接收更多来自其他干路光纤的业务。
图4为本申请提供的另一种海底光缆系统的示意图。例如，干路光纤集合106还可以包括第三干路光纤106c，第三干路光纤106c具有对应的第三传输通道集合。相较于图2 所示的海底光缆系统，第一干路站点101中的第六终端101c还可以通过第三传输通道集合中的其中一条传输通道发送第三业务。第一OXC设备104还可以将用于传输第三业务的传输通道转移至第二干路光纤106b。那么，第五终端103a就可以通过第二干路光纤106b上载或下载第三业务。第二OXC设备105还可以将该传输通道再转移回第三干路光纤106c。第二干路站点102中的第七终端102c还可以通过该传输通道接收第三业务。可以理解的是，干路光纤集合106中干路光纤的数量以实际应用为准，具体此处不做限定。
需要说明的是，上述实施例中干路光纤对应的传输通道的具体形式可以有多种，下面分别进行介绍：
第一种、每路干路光纤对应的传输通道集合为每路干路光纤的光谱带宽，每路干路光纤的光谱带宽可以划分为多个光谱子带，不同的光谱子带传输不同的业务。
图5为OXC设备对光谱子带进行转移的示意图。第一干路光纤106a的第一光谱带宽包括波长λ1至波长λn的共N个光谱子带，第二干路光纤106b的第二光谱带宽同样包括λ1至λn共N个光谱子带。
具体地，第一业务和第二业务是以光信号的形式进行传输，解复用器104a可以对第一干路光纤106a中传输的光信号进行分波得到光谱子带λ1至λn，其中，第一业务占用第一光谱带宽中的光谱子带λ2。同理，解复用器104b可以对第二干路光纤106b中传输的光信号进行分波得到光谱子带λ1至λn，其中，第二业务占用第二光谱带宽中的光谱子带λ1。
需要说明的是，在实际应用中可以事先约定好每个客户的业务所占用的光谱子带。例如，不论是第一干路光纤106a的第一光谱带宽，还是第二干路光纤106b的第二光谱带宽，光谱子带λ1都用于传输第二业务，光谱子带λ2都用于传输第一业务。这样一来，为每个客户的业务分配带宽不再局限于某个光纤对，而是将所有光纤对的光谱带宽都划分为多个光谱子带，并统一为每个客户的业务分配带宽。
第一OXC设备104对第一光谱带宽中的光谱子带λ2和第二光谱带宽中的光谱子带λ2进行交换。进而，复用器104c对交换后的各光谱子带中的光信号进行合波并耦合至第一干路光纤106a。同理，复用器104d对交换后的各光谱子带中的光信号进行合波并耦合至第二干路光纤106b。可以看出，原本在第一干路光纤106a中传输的第一业务经过第一OXC设备104的处理后，第一业务转移到第二干路光纤106b中传输。同样的，第二OXC设备105与第一OXC设备104的处理方式类似，第二OXC设备对第一光谱带宽中的光谱子带λ2和第二光谱带宽中的光谱子带λ2再进行一次交换即可。
可选地，第一干路光纤106a的第一光谱带宽和第二干路光纤106a的第二光谱带宽可以包括相同的光谱子带，例如，第一光谱带宽和第二光谱带宽可以都是包括λ1至λ100共100个光谱子带。又或者，第一光谱带宽和第二光谱带宽所包括的光谱子带是不同的，例如，第一光谱带宽包括λ1至λ20共20个光谱子带，第二光谱带宽包括λ21至λ50共30个光谱子带。
需要说明的是，若第一光谱带宽和第二光谱带宽所包括的光谱子带相同，那么第一OXC设备104可以按照上述描述的方式对第一光谱带宽和第二光谱带宽中相同的光谱子带进行 交换。而若第一光谱带宽和第二光谱带宽所包括的光谱子带不同，那么第一OXC设备104就将用于传输第一业务的光谱子带转移至第二光谱带宽，例如，原本第二光谱带宽包括光谱子带λ21至λ50，经过第一OXC设备104的处理后，第二光谱带宽中还添加了λ2。
可选地，光谱带宽中的每个光谱子带可以包括一个波长值，也可以包括多个波长值。图6为一种光谱带宽划分为光谱子带的示意图。例如，光谱带宽包括波长λ1至波长λ100，波长λ1至波长λ10对应一个光谱子带，波长λ11至波长λ20对应一个光谱子带，以此类推，该光谱带宽划分为10个光谱子带。或者，也可以是每个波长对应一个光谱子带，例如，光谱带宽包括波长λ1至波长λ100，那么该光谱带宽划分为100个光谱子带。另外，在实际应用中，每个光谱子带的波长范围可以相同(等分)，也可以不同(非等分)，具体此处不做限定。
第二种、每路干路光纤均为多芯光纤，每根纤芯对应一条传输通道。
图7为OXC设备对纤芯进行转移的示意图。第一干路光纤106a包括纤芯1至纤芯n共N根纤芯，第二干路光纤106b同样包括纤芯1至纤芯n共N根纤芯。
具体地，扇出(FAN-out)模块104e将第一干路光纤106a中的N根纤芯剥离开来，扇出模块104f将第二干路光纤106b中的N根纤芯剥离开来。其中，第一干路光纤106a中的纤芯2用于传输第一业务，第二干路光纤106b中的纤芯1用于传输第二业务。
第一OXC设备104可以对第一干路光纤106a中的纤芯2和第二干路光纤106b中除了纤芯1外的任意一根纤芯进行交换。进而，扇入(FAN-in)模块104g将交换后的纤芯再并入第一干路光纤106a。同样的，扇入模块104h将交换后的纤芯再并入第二干路光纤106b。通过纤芯的交换，原本在第一干路光纤106a中传输的第一业务将转移到第二干路光纤106b中传输。第二OXC设备105与第一OXC设备104的处理方式类似，第二OXC设备将之前交换过的两根纤芯再交换回来即可。
可选地，第一OXC设备104也可以将第一干路光纤106a中的纤芯2添加到第二干路光纤106b中，原本就在第二干路光纤106b中的纤芯保持不变。之后，第二OXC设备105再将添加到第二干路光纤106b中的纤芯2再转移回第一干路光纤106a中。
可选地，第一干路光纤106a和第二干路光纤106b中的纤芯数量可以相同也可以不同，具体此处不做限定。
需要说明的是，实际应用中，凡是可以对业务的传输通道进行转移或交换的装置都属于本申请中所述的OXC设备。
本申请实施例提供的海底光缆系统中，第一OXC设备可以将第一干路光纤对应的第一传输通道集合中的第一传输通道转移至第二干路光纤，这样一来，虽然支路站点没有通过支路光纤与第一干路光纤相连，仍然可以通过与第二干路光纤相连的支路光纤上载或下载原本在第一干路光纤中传输的业务。也就是说，基于本申请的海底光缆系统，支路站点只需要与干路光纤集合中的其中一路干路光纤相连即可实现对干路光纤集合中传输的任意业务进行上载或下载，无需为支路站点配置多条支路光纤，降低了海底光缆系统的复杂度。
需要说明的是，本申请也可以应用于包括多条支路光纤的海底光缆系统中。图8为本申请提供的另一种海底光缆系统的示意图。可以看出，与图2所示的海底光缆系统的不同 之处在于，支路站点103中的第八终端103b通过另一条支路光纤111与第一干路光纤106a相连。相应的，分支设备108内还可以配置光开关108b，其中，光开关108b设置于第一干路光纤106a上。支路光纤111上还可以设置有ROADM设备112。
在该海底光缆系统中所有设备都正常工作的情况下，第一终端101a发送的第一业务在第一干路光纤106a中传输，光开关108b可以将第一业务切换到支路光纤111中传输。ROADM设备112可以通过支路光纤111将第一业务下载至第八终端103b。然而，在由于ROADM设备112出现故障或支路光纤111出现故障等原因导致的第一业务中断时，第一OXC设备104可以将原本在第一干路光纤106a中传输的第一业务将转移到第二干路光纤106b中传输，以保证第一业务可以正常向支路站点103传输。
可以理解的是，凡是可以通过OXC设备对用于传输业务的传输通道进行转移或交换的海底光缆系统均在本申请的保护范围之内。
需要说明的是，以上实施例仅用以说明本申请的技术方案，而非对其限制。尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (12)

  1. 一种海底光缆系统，其特征在于，包括：第一干路站点、第二干路站点、支路站点、第一光交叉OXC设备、第二OXC设备、干路光纤集合和支路光纤，其中，所述第一OXC设备的一端通过所述干路光纤集合与所述第一干路站点相连，所述第一OXC设备的另一端通过所述所述干路光纤集合与所述第二OXC设备的一端相连，所述第二OXC设备的另一端通过所述干路光纤集合与所述第二干路站点相连，所述干路光纤集合至少包括第一干路光纤和第二干路光纤，所述支路站点通过支路光纤与所述第一OXC设备和所述第二OXC设备之间的第二干路光纤相连，所述第一干路光纤对应第一传输通道集合，所述第二干路光纤对应第二传输通道集合；
    所述第一干路站点用于通过所述第一传输通道集合中的第一传输通道发送第一业务，并通过所述第二传输通道集合中的第二传输通道发送第二业务；
    所述第一OXC设备用于将所述第一传输通道转移至所述第二干路光纤；
    所述支路站点用于通过所述第二干路光纤上载或下载所述第一业务和所述第二业务；
    所述第二OXC设备用于将转移后的第一传输通道转移至所述第一干路光纤；
    所述第二干路站点用于通过所述第一传输通道接收所述第一业务，并通过所述第二传输通道接收所述第二业务。
  2. 根据权利要求1所述的海底光缆系统，其特征在于，所述第一OXC设备用于对所述第一传输通道和所述第二传输通道集合中的第三传输通道进行交换；
    所述第二OXC设备用于对交换后的第一传输通道和交换后的第三传输通道进行交换。
  3. 根据权利要求2所述的海底光缆系统，其特征在于，所述第一传输通道集合为所述第一干路光纤对应的第一光谱带宽，所述第一光谱带宽包括N个光谱子带，所述N为大于1的整数，所述第一光谱带宽中的第一光谱子带用于传输所述第一业务，所述第二传输通道集合为所述第二干路光纤对应的第二光谱带宽，所述第二光谱带宽包括所述M个光谱子带，所述M为大于1的整数，所述第二光谱带宽中的第二光谱子带用于传输所述第二业务；
    所述第一OXC设备用于对所述第一光谱子带和所述第二光谱带宽中的第三光谱子带进行交换，所述第一光谱子带的波长范围与所述第三光谱子带的波长范围相同；
    所述第二OXC设备用于对交换后的第一光谱子带和交换后的第三光谱子带进行交换。
  4. 根据权利要求3所述的海底光缆系统，其特征在于，所述第一光谱带宽中的每个光谱子带包括至少一个波长值，所述第二光谱带宽中的每个光谱子带包括至少一个波长值。
  5. 根据权利要求2所述的海底光缆系统，其特征在于，所述第一传输通道集合为所述第一干路光纤包括的第一纤芯集合，所述第一纤芯集合包括N根纤芯，所述第一纤芯集合中的第一纤芯用于传输所述第一业务，所述第二传输通道集合为所述第二干路光纤包括的第二纤芯集合，所述第二纤芯集合包括M根纤芯，所述M为大于1的整数，所述第二纤芯集合中的第二纤芯用于传输所述第二业务；
    所述第一OXC设备用于对所述第一纤芯和所述第二纤芯集合中的第三纤芯进行交换；
    所述第二OXC设备用于对交换后的第一纤芯和交换后的第三纤芯进行交换。
  6. 根据权利要求1至5中任一项所述的海底光缆系统，其特征在于，所述第一干路站 点至少包括第一终端和第二终端，所述第二干路站点至少包括第三终端和第四终端，所述支路站点至少包括第五终端；
    所述第一终端用于通过所述第一传输通道发送第一业务；
    所述第二终端用于通过所述第二传输通道发送第二业务；
    所述第五终端用于通过所述第二传输通道上载或下载所述第二业务，并通过所述第一传输通道上载或下载所述第一业务；
    所述第三终端用于通过所述第一传输通道接收所述第一业务；
    所述第四终端用于通过所述第二传输通道接收所述第二业务。
  7. 根据权利要求1至6中任一项所述的海底光缆系统，其特征在于，所述干路光纤集合还包括第三干路光纤，所述第三干路光纤对应第三传输通道集合；
    所述第一干路站点还用于通过所述第三传输通道集合中的第四传输通道发送第三业务；
    所述第一OXC设备还用于将所述第四传输通道转移至所述第二干路光纤；
    所述支路站点还用于通过所述第二干路光纤上载或下载所述第三业务；
    所述第二OXC设备用于将转移后的第四传输通道转移至所述第三干路光纤；
    所述第二干路站点用于通过所述第四传输通道接收所述第三业务。
  8. 根据权利要求1至7中任一项所述的海底光缆系统，其特征在于，所述第一干路光纤为第一干路光纤对中的其中一路光纤，所述第二干路光纤为第二干路光纤对中的其中一路光纤。
  9. 根据权利要求1至8中任一项所述的海底光缆系统，其特征在于，所述海底光缆系统还包括分支设备BU，所述分支设备设置于所述第一OXC设备和所述第二OXC设备之间，所述BU还包括光开关，所述光开关设置于所述第一OXC设备和所述第二OXC设备之间的第二干路光纤上，所述支路光纤通过所述光开关与所述第一OXC设备和所述第二OXC设备之间的第二干路光纤相连；
    所述光开关用于将所述第一业务和所述第二业务切换至所述支路光纤上传输。
  10. 根据权利要求1至9中任一项所述的海底光缆系统，其特征在于，所述海底光缆系统还包括可重构光分叉复用ROADM设备，所述ROADM设备的一端通过所述支路光纤与所述支路站点相连，所述ROADM设备的另一端通过所述支路光纤与所述第一OXC设备和所述第二OXC设备之间的第二干路光纤相连；
    所述ROADM设备用于通过所述支路光纤将所述第二业务下载至所述支路站点，并通过所述支路光纤将所述第一业务下载至所述支路站点；
    或者，
    所述ROADM设备用于通过所述支路光纤上载来自所述支路站点的所述第二业务，并通过所述支路光纤上载来自所述支路站点的所述第一业务。
  11. 根据权利要求1至10中任一项所述的海底光缆系统，其特征在于，所述海底光缆系统还包括至少一个中继器，所述中继器设置于所述第一OXC设备和所述第二OXC设备之间的干路光纤集合上，或者，所述中继器设置于所述支路光纤上；
    所述中继器用于对所述第一干路站点发送的光信号进行放大，所述第一业务和所述第 二业务以光信号的形式传输；
    或者，
    所述中继器用于对所述支路站点发送的光信号进行放大。
  12. 根据权利要求1至11中任一项所述的海底光缆系统，其特征在于，所述干路光纤集合中的干路光纤和所述支路光纤的光纤类型包括单模光纤SMF、多模光纤MMF或多芯光纤MCF。
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