WO2015180508A1 - 基于波分pon系统的开放网络架构及信号传输方法 - Google Patents

基于波分pon系统的开放网络架构及信号传输方法 Download PDF

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Publication number
WO2015180508A1
WO2015180508A1 PCT/CN2015/071916 CN2015071916W WO2015180508A1 WO 2015180508 A1 WO2015180508 A1 WO 2015180508A1 CN 2015071916 W CN2015071916 W CN 2015071916W WO 2015180508 A1 WO2015180508 A1 WO 2015180508A1
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optical
signal
service
current
wavelength
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French (fr)
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王素椅
何岩
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Fiberhome Telecommunication Technologies Co Ltd
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Fiberhome Telecommunication Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/03—WDM arrangements
    • H04J14/0305—WDM arrangements in end terminals

Definitions

  • the present invention relates to the field of passive optical network optical access technology based on WDM (Wavelength Division and Multiplexing) technology, and particularly relates to an open network architecture and a signal transmission method based on a wavelength division PON system.
  • WDM Widelength Division and Multiplexing
  • the optical access network is an important part of the optical fiber communication network.
  • a large number of optical access devices such as PON equipment, central office OLT equipment, ODN equipment, ONU equipment, etc.
  • the PON network architecture is closed, so the services carried in the PON network are single.
  • most PON networks generally carry fixed-line Ethernet signals and rarely carry mobile signals.
  • the BBU Building Baseband Unit
  • RRU Remote Radio Unit
  • a point-to-point fiber connection is generally used between a single BBU and a single RRU.
  • the BBU and the RRU transmit more signals, which wastes a large amount of optical fiber resources.
  • the closed network architecture has the following drawbacks:
  • the existing fixed network and mobile network respectively use independent access network facilities.
  • Both the fixed network and the mobile network need to adopt the access network infrastructure (such as ODN) with a service life of 30 to 40 years.
  • the use of fixed network and mobile network in the infrastructure of two sets of access networks not only wastes a lot of resources, reduces the utilization of network resources, but also has high maintenance costs.
  • the present invention aims to provide an open network architecture and a signal transmission method based on a wavelength division PON system, which can integrate multiple mobile services, such as mobile services and fixed network services, into the same optical interface.
  • multiple mobile services such as mobile services and fixed network services
  • the present invention aims to provide an open network architecture and a signal transmission method based on a wavelength division PON system, which can integrate multiple mobile services, such as mobile services and fixed network services, into the same optical interface.
  • Into the infrastructure complete the uplink signal transmission and downlink signal transmission of a variety of different services; not only the service access capability is strong, the scope of application is relatively wide, and resource sharing can be realized, resource waste is reduced, and the use cost is low.
  • an open network architecture based on a wavelength division PON system including an open optical line terminal device OOLT, an optical distribution network ODN, a plurality of service providing devices providing different services, and a plurality of bearers.
  • the optical remote unit ORU device of different services, the service providing device is connected to the OOLT, and the OOLT is connected to each ORU device through the ODN;
  • the OOLT includes a control unit, a service selection unit, an optical transceiver array unit, a clock unit, and a plurality of service-side optical modules that carry different services;
  • the control unit is respectively connected to the service selection unit, the optical transceiver array unit, and the clock unit;
  • the optical module is connected to a service providing device corresponding to the service;
  • the service selecting unit is provided with a plurality of service data channels carrying different services, and each service-side optical module passes data corresponding to the service.
  • the channel is connected to the optical transceiver array unit;
  • the ODN includes a trunk fiber, a periodic arrayed waveguide grating AWG, and a plurality of branch fibers; the optical transceiver array unit is connected to the AWG through the trunk fiber; the AWG is connected to the optical modules of all the ORU devices through the branch fiber, and the 1 branch fiber connection 1 Taiwan ORU equipment;
  • the service providing devices that provide different services include at least one of an Ethernet ETH switch, a repeater near-end device, and an indoor baseband processing unit BBU.
  • a plurality of ORU devices carrying different services include at least one of an optical network unit ONU, a repeater remote unit, and a remote radio module RRU.
  • the optical transceiver array unit comprises an optical receiver array, a demultiplexer, an optical transmission array, a multiplexer and a filter, and the service selection unit is respectively connected to the optical receiver array and the optical transmission array.
  • the optical receiver array is connected to the filter through a demultiplexer
  • the optical transmitting array is connected to the filter through a multiplexer
  • the filter is connected to the AWG.
  • a signal transmission method based on a wavelength division PON system for the above open network architecture comprising the following steps:
  • the service side optical module photoelectrically converts the optical signal into an electrical signal, and the control unit determines the data channel of the service selection unit according to the current electrical signal; the service side optical module sends the current electrical signal to the optical transceiver array unit through the determined data channel. ;
  • the optical transceiver array unit converts the current electrical signal into an optical signal by electro-optical, and will After the optical signal is wavelength-multiplexed, it is output to the AWG through the backbone fiber.
  • the AWG performs wavelength demultiplexing on the current optical signal, and then outputs the downlink optical signal to the ORU device corresponding to the service of the current service-side optical module through the branch fiber.
  • the optical module of the ORU device converts the current data into an optical signal by the electro-optical.
  • the ORU device outputs the current optical signal to the AWG, the AWG through the branch fiber corresponding to the working wavelength of the current optical signal. After the current optical signal is wavelength-multiplexed, it is transmitted to the optical transceiver array unit through the trunk optical fiber;
  • the optical transceiver array unit performs wavelength demultiplexing on the current optical signal and photoelectrically converts it into an electrical signal, and the control unit and the clock unit determine a data channel of the service selection unit according to the current electrical signal; the optical transceiver array unit passes the current electrical signal The determined data channel is transmitted to the service-side optical module corresponding to the current electrical signal service, and the service-side optical module converts the current electrical signal into an optical signal through the electro-optical signal, and outputs the data to the service providing device corresponding to the current optical signal service. The transmission of the uplink signal is completed and ends.
  • the AWG After the AWG performs wavelength demultiplexing on the current optical signal, the AWG outputs the branch optical fiber to the ORU device corresponding to the service of the current service-side optical module, including the following steps: the AWG will present The optical signal is split to a branch fiber corresponding to the wavelength, and the branch fiber is output to the ORU device corresponding to the service of the current service-side optical module.
  • the AWG in the step D performs wavelength multiplexing on the current optical signal, and then transmits the optical signal to the optical transceiver array unit through the trunk optical fiber, including the following steps: the working wavelength of the current optical signal of the AWG is different from the other After the working wavelengths are combined, they are transmitted to the optical transceiver array unit through the backbone fiber.
  • the service providing device that provides different services includes an ETH switch and a BBU, and the service-side optical modules that carry different services include 1.25G ETH optical modules and 3G optical modules, and several bear different services.
  • ORU The equipment unit includes an ONU and an RRU;
  • the ETH switch is connected to the 1.25G ETH optical module, and the 1.25G ETH optical module is connected to the service selection unit through the ETH interface.
  • the service selection unit is provided with a data channel Ch8 carrying the 1.25G ETH service, and the Ch8 is connected to the ONU through one branch fiber.
  • the BBU is connected to the 3G optical module.
  • the 3G optical module is connected to the service selection unit through the common public radio interface CPRI interface.
  • the service selection unit is configured with a data channel Ch1 carrying the 3G service; Ch1 is connected to the RRU through one branch fiber.
  • the signal transmission method based on the wavelength division PON system includes the following steps:
  • the 1.25G ETH optical module receives the output signal of the ETH switch, the current Ethernet signal flows in the downlink direction; the 1.25G ETH optical module converts the current Ethernet signal into an electrical signal; the 1.25G ETH optical module will be the current one.
  • the signal is output to the optical transceiver array unit through the data channel Ch8; the corresponding working wavelength of the data channel Ch8 is ⁇ d/u8, where d indicates that the downlink signal is carried, and u indicates that the uplink signal is carried;
  • the optical transceiver array unit converts the current electrical signal into an Ethernet optical signal, and wavelength-multiplexes the current optical signal with other optical signals of different working wavelengths, and then outputs the optical signal to the AWG through the backbone optical fiber;
  • the wavelength Ethernet optical signal is wavelength-demultiplexed and passed through a branch fiber with a working wavelength of ⁇ d8 and output to the receiving end of the ONU to complete transmission of the downlink Ethernet signal;
  • the ONU receives data from the user, the current Ethernet signal flows in the upstream direction; the ONU optical module converts the current data into an optical signal, and the output wavelength is ⁇ u8; the ORU device passes the branch fiber with the working wavelength ⁇ u8. Outputting the current optical signal to the AWG; the AWG optically multiplexes the current optical signal with the output wavelength of the other ORU device, and then outputs the optical transceiver array unit through the trunk optical fiber;
  • the optical transceiver array unit performs wavelength demultiplexing on the wavelength-multiplexed optical signal and photoelectrically converts it into an electrical signal; the optical transceiver array unit outputs the current electrical signal to the 1.25G ETH optical module through the data channel Ch8, and the 1.25G ETH optical module The current electrical signal is converted into an optical signal by electro-optical, and output to the ETH switch to complete the transmission of the uplink Ethernet signal.
  • the signal transmission method based on the wavelength division PON system includes the following steps:
  • the 3G optical module receives the output signal of the BBU, the current 3G mobile signal flows in the downlink direction; the 3G optical module photoelectrically converts the current 3G mobile signal into an electrical signal; the 3G optical module outputs the current electrical signal through the data channel Ch1 to The optical transceiver array unit, the corresponding wavelength of the data channel Ch1 is ⁇ d/u1;
  • the optical transceiver unit converts the current electrical signal into an optical signal
  • the current optical signal is wavelength-multiplexed with other optical signals having different working wavelengths, and then output to the AWG through the backbone optical fiber;
  • the AWG converts the wavelength-multiplexed optical signal Performing wavelength demultiplexing and outputting the branch fiber with the working wavelength ⁇ d1 to the receiving end of the RRU to complete the transmission of the downlink 3G mobile signal;
  • the RRU receives the data from the user, the current 3G mobile signal flows in the uplink direction; the optical module of the RRU converts the current data into an optical signal, and the output wavelength is ⁇ u1, and the ORU device passes the branch fiber with the working wavelength ⁇ u1.
  • the current optical signal is output to the AWG; the AWG wavelength-multiplexes the current optical signal with the output wavelength of other ORU devices, and then outputs the optical signal to the optical transceiver array unit through the backbone optical fiber.
  • the optical transceiver array unit wavelength-demultiplexes the wavelength-multiplexed optical signal and photoelectrically converts it into an electrical signal; the optical transceiver array unit outputs the current electrical signal to the 3G optical module through the data channel Ch1, and the 3G optical module outputs the current electrical signal. It is converted into an optical signal by electro-optical light and output to the BBU to complete the transmission of the uplink 3G mobile signal.
  • the network architecture of the present invention includes a service selection unit.
  • the service selection unit can add a corresponding service according to the service requirement, select a corresponding optical module, and configure a data channel corresponding to the service.
  • the ORU devices corresponding to different services are connected to the supported service branches. Therefore, the network architecture of the present invention is open, and can integrate multiple mobile services, such as mobile services and fixed network services, into the same optical access infrastructure, and complete uplink signal transmission and downlink signal transmission of multiple different services; The access capability is strong, and the network resource utilization rate is improved.
  • the network architecture of the present invention is based on the WPON system, which can save the backbone fiber and reduce the use cost.
  • the network architecture of the present invention When used, it can access a plurality of different services and realize multi-service sharing. Therefore, the present invention can be applied to various ORU devices, which can not only improve device utilization, but also save device developers to repeat. Development costs for development.
  • the present invention only needs to maintain a single network architecture, and the maintenance cost is low; and the network architecture of the present invention uses a standard physical communication interface. It is convenient for users (devices of various manufacturers) to communicate and use.
  • FIG. 1 is a structural block diagram of an open network architecture based on a wavelength division PON system according to an embodiment of the present invention
  • FIG. 2 is a structural block diagram of an OOLT according to an embodiment of the present invention.
  • FIG. 3 is a structural block diagram of an optical transceiver array unit according to an embodiment of the present invention.
  • FIG. 4 is a structural block diagram of an open network architecture based on a wavelength division PON system in an application embodiment of the present invention.
  • an open network architecture based on a WDM Passive Optical Network (WDM) system includes an OOLT (Open Optical Line Termination). Equipment, ODN (Optical Distribution Network), a number of service providers that provide different services, and a number of ORUs (Optical Remote Units) that carry different services.
  • the service providing device is connected to the OOLT, and the OOLT is connected to each ORU device through the ODN.
  • the service provider device is an ETH (Ethernet) switch, a near-end device of the repeater, and a BBU (Building Baseband Unit).
  • the service-side optical module has corresponding service-providing devices. In all cases, all services are free to access the network architecture.
  • the ORU device is an RRU (Remote Radio Unit), a remote unit of the repeater, and an ONU (Optical Network Unit) of the type such as SFU/MDU;
  • the optical module has a wavelength adaptive function (ie, the output wavelength can be tuned to the corresponding wavelength output according to different wavelengths of the ODN branch fiber).
  • the OOLT includes a control unit, a service selection unit, an optical transceiver array unit, a clock unit, and a plurality of service-side optical modules for connecting uplinks.
  • the control unit has a CDR (Clock and Data Recovery) function, and the control unit is respectively connected to the service selection unit, the optical transceiver array unit, and the clock unit.
  • Each service-side optical module in the OOLT carries different services.
  • Each service-side optical module is connected to a service-providing device corresponding to the service.
  • the service selection unit is configured with a plurality of service data channels carrying different services.
  • the edge optical module passes the data channel corresponding to its service. Connected to the optical transceiver array unit.
  • the ODN includes a backbone fiber, an AWG (Periodic Arrayed Waveguide Grating), and a plurality of branch fibers.
  • the optical transceiver array unit is connected to the AWG through a trunk fiber, and the AWG is connected to the optical modules of all the ORU devices through the branch fiber, and one branch fiber connection 1
  • An ORU device; a branch fiber can allow multiple different wavelengths to operate simultaneously.
  • the optical transceiver array unit includes an optical receiver array, a demultiplexer, an optical transmission array, a multiplexer and a filter, and the service selection unit is respectively connected to the optical receiver array and the optical transmission array, and the optical receiver
  • the array is connected to the filter through a demultiplexer, and the optical transmission array is connected to the filter through a multiplexer, and the filter is connected to the AWG of the ODN.
  • step S1 determining the flow direction of the signal, if the service side optical module receives the optical signal sent by the service providing device corresponding to the service, the current signal flows in the downlink direction, and proceeds to step S2; if the ORU device receives the data from the user Then, the current signal flows in the upward direction, and the process goes to step S4.
  • the service side optical module photoelectrically converts the optical signal into an electrical signal, and the control unit determines the data channel of the service selection unit according to the current electrical signal, and the control unit controls the clock unit to configure the reference clock for the current data channel; the service side optical module will be the current power
  • the signal is sent to the optical transceiver array unit through the determined data channel.
  • the optical transceiver array unit converts the current electrical signal into an optical signal, and wavelength-multiplexes the current optical signal, and then outputs the optical signal to the AWG through the trunk optical fiber, and the AWG performs wavelength demultiplexing on the current optical signal (ie, the current optical signal)
  • the branching fiber is output to the ORU device corresponding to the service of the current service-side optical module, and the downlink signal is transmitted and terminated.
  • the optical module of the ORU device After the ORU device receives the data from the user, the optical module of the ORU device will be The pre-data is converted into an optical signal by electro-optical, and the ORU device outputs the current optical signal to the AWG through a branch fiber corresponding to the working wavelength of the current optical signal, and the AWG performs wavelength multiplexing on the current optical signal (ie, output with other ORU devices). Wavelength multiplexing) is transmitted to the optical transceiver array unit through the backbone fiber.
  • the optical transceiver array unit performs wavelength demultiplexing on the current optical signal and photoelectrically converts the electrical signal into an electrical signal, and the control unit and the clock unit determine the data channel of the service selection unit according to the current electrical signal.
  • the optical transceiver module transmits the current electrical signal to the service-side optical module corresponding to the current electrical signal service through the determined data channel, and the service-side optical module converts the current electrical signal into an optical signal by the electro-optical signal, and outputs the current electrical signal to the current
  • the service providing device corresponding to the optical signal service completes the transmission of the uplink signal and ends.
  • the control unit is mainly used to complete the management and control functions of the entire OOLT device, including different service selection of different data channels, and configuration of corresponding clock output and management control of the optical module according to the service of the channel.
  • the clock unit When the data channel of the service selection unit is determined, the clock unit provides a clock for the service selection unit. Because different service rates are different and clock precision requirements are different, the clock unit can provide corresponding reference for different data channels according to different service configurations. Clock output.
  • the receiving end and the transmitting end of the optical transceiver array unit can operate at the same wavelength or different wavelengths.
  • the optical transceiver array unit transmits the signal in the downlink direction
  • the electrical signal from the service selection unit is converted into an optical signal and then sent to the ODN
  • the optical signal from the ODN is converted into an electrical signal. After that, it is sent to the corresponding data channel of the service selection unit.
  • the upstream working wavelength and the downstream operating wavelength may be the same or different.
  • Upstream working wavelength and downstream operating wavelength by WPON The technical decision adopted by the system; if the WPON system adopts the wavelength reuse mode, the uplink working wavelength and the downlink working wavelength are the same; if the WPON system adopts the tunable laser mode, the uplink working wavelength and the downlink working wavelength are generally different.
  • the open network architecture of the wavelength division PON system and the method for transmitting signals thereof according to the present invention are specifically described below through an application embodiment.
  • the open network architecture in this application embodiment is based on a wavelength division PON system; the wavelength division PON system covers eight wavelength pairs, wherein the uplink 8 wavelengths and the downlink 8 wavelengths.
  • the working wavelength of the uplink is different from the working wavelength of the downlink, the working wavelength of the uplink is the C-band, and the working wavelength of the downlink is the L-band, thereby achieving single-fiber bidirectional transmission.
  • the service transmitted in this application embodiment is an Ethernet service at a rate of 1.25 Gb/s and a mobile service at a 3G rate.
  • the open network architecture based on the wavelength division PON system in the application embodiment includes an OOLT, an ODN, an ORU device with different services, and a service providing device.
  • the OOLT includes a control unit, a service selection unit, an 8-way optical transceiver array unit, a clock unit, and a plurality of service-side optical modules with different services.
  • the service selection unit includes a 16 ⁇ 16 cross chip supporting multi-service and with CDR function, which includes 16 ports: port 1, port 2, port 3, port 4, port 5, port 6, port 7, port 8, port 9. Port 10, port 11, port 12, port 13, port 14, port 15, port 16; port 1 to port 8 are respectively connected to one service optical module, and ports 9 to 16 are connected to eight optical transceiver units. .
  • the clock unit includes a clock selector, a 49.152MMhz crystal and a 125Mhz crystal, and the 49.152MMhz crystal and the 125Mhz crystal are all connected to the service selection unit through a clock selector.
  • the service providing device includes an ETH switch and a BBU, and the service side optical module includes a 1.25G ETH optical module and a 3G optical module, and the ORU device unit includes an ONU and an RRU.
  • ONU The optical module connected to the AWG and the optical module connected to the RRU and the AWG have automatic wavelength adaptation.
  • the ETH switch is connected to the 1.25G ETH optical module.
  • the 1.25G ETH optical module is connected to the port 1 through the ETH interface.
  • the port 1 and the port 16 form a data channel Ch8 carrying the 1.25G ETH service.
  • the Ch8 is connected to the ONU through a branch fiber.
  • the BBU is connected to the 3G optical module.
  • the 3G optical module is connected to the port 8 through the CPRI interface (general public wireless interface).
  • the port 8 and the port 9 form a data channel Ch1 that carries the 3G service.
  • the Ch1 is connected to the RRU through one branch fiber.
  • the ODN includes the backbone fiber, the AWG, and the branch fiber.
  • the 8-channel optical transceiver array unit is connected to the AWG through the backbone fiber.
  • the AWG is connected to the ONU and the RRU through two branch fibers respectively.
  • Each branch fiber allows one L-band wavelength and one C. The wavelength of the band works at the same time, achieving single-fiber bidirectional transmission.
  • the 1.25G ETH optical module receives the output signal of the ETH switch, the current Ethernet signal flows in the downstream direction.
  • the 1.25G ETH optical module photoelectrically converts the current Ethernet signal into an electrical signal; the control unit controls the clock unit to configure a 125Mhz clock for the data channel Ch8, and the 1.25G ETH optical module passes the current electrical signal through the data channel Ch8 (ie, input from the port 1)
  • the output from the port 16 is output to the 8-channel optical transceiver array unit, and the corresponding wavelength of the data channel Ch8 is ⁇ d/u8 (d indicates that the downlink signal is carried, and u indicates that the uplink signal is carried).
  • the 8-channel optical transceiver array unit converts the current electrical signal into an Ethernet optical signal, and operates at a branch of wavelength ⁇ d8, and ⁇ d8 is wavelength-multiplexed with other optical signals of different working wavelengths ( ⁇ d1 ⁇ ⁇ d7), and then passes through the trunk. Fiber output to AWG, AWG vs. wavelength
  • the multiplexed multi-wavelength Ethernet optical signal is wavelength demultiplexed (ie, split-wave), and the wavelength-demultiplexed optical signal works on the respective branch fibers, and the optical signal of Ch8 is output to the ONU through the branch optical fiber of ⁇ d8. End, complete the transmission of the downlink Ethernet signal.
  • the current Ethernet signal flows in the upstream direction.
  • the ONU's optical module converts the current data into an optical signal with an output wavelength of ⁇ u8.
  • the ORU device outputs the current optical signal to the AWG through a branch fiber with a working wavelength of ⁇ u8.
  • the AWG wavelength-multiplexes the current optical signal with the output wavelength of other ORU devices (ie, wavelength multiplexed), and outputs it to the 8 through the backbone fiber.
  • Road light transceiver array unit converts the current data into an optical signal with an output wavelength of ⁇ u8.
  • the ORU device outputs the current optical signal to the AWG through a branch fiber with a working wavelength of ⁇ u8.
  • the AWG wavelength-multiplexes the current optical signal with the output wavelength of other ORU devices (ie, wavelength multiplexed), and outputs it to the 8 through the backbone fiber.
  • Road light transceiver array unit converts the current data into an optical signal with an output wavelength of ⁇ u8
  • the 8-channel optical transceiver array unit performs wavelength demultiplexing (ie, wavelength division) on the wavelength-multiplexed optical signal, and photoelectrically converts it into an electrical signal; the 8-channel optical transceiver array unit passes the current electrical signal through the data channel Ch8 (ie, from Port 16 input, output from port 1) is output to the 1.25GETH optical module.
  • the 1.25G ETH optical module converts the current electrical signal into an optical signal and outputs it to the ETH switch to complete the transmission of the uplink Ethernet signal.
  • the method for transmitting a 3G mobile signal signal based on a signal of a wavelength division PON system in this application embodiment includes the following steps:
  • the 3G optical module receives the output signal of the BBU, the current 3G mobile signal flows in the downlink direction.
  • the 3G optical module photoelectrically converts the current 3G mobile signal into an electrical signal; the control unit controls the clock unit to configure a clock of 49.125 Mhz (or a frequency having a multiple relationship with the 3G rate) for the data channel Ch1, and the 3G optical module passes the current electrical signal through the data.
  • the channel Ch1 i.e., input from port 8 and output from port 9) is output to eight optical transceiver units, and the corresponding wavelength of the data channel Ch1 is ⁇ d/u1.
  • the 8-channel optical transceiver array unit converts the current electrical signal into an optical signal
  • the working wavelength is ⁇ d1
  • ⁇ d1 is wavelength-multiplexed with other optical signals of different working wavelengths.
  • the optical fiber output to the AWG and the AWG is wavelength-demultiplexed, and is output to the receiving end of the RRU through the branch fiber with the working wavelength of ⁇ d1 to complete the transmission of the downlink 3G mobile signal.
  • the current 3G mobile signal flows in the upstream direction.
  • the optical module of the RRU converts the current data into an optical signal by electro-optical, and its output wavelength is ⁇ u1.
  • the ORU device outputs the current optical signal to the AWG through a branch fiber operating at ⁇ u1.
  • the AWG wavelength-multiplexes the current optical signal with the output wavelength of other ORU devices (ie, wavelength multiplexing), and outputs it to the 8-channel optical transceiver array unit through the backbone fiber.
  • the 8-channel optical transceiver array unit wavelength-demultiplexes the wavelength-multiplexed optical signal and photoelectrically converts it into an electrical signal; the 8-channel optical transceiver array unit passes the current electrical signal through the data channel Ch1 (ie, input from port 9 and from the port) 8 output) output to the 3G optical module, the 3G optical module converts the current electrical signal into an optical signal by electric light, and outputs it to the BBU to complete the transmission of the uplink 3G mobile signal.
  • Ch1 ie, input from port 9 and from the port 8 output

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Abstract

本发明公开了一种基于波分PON系统的开放网络架构及信号传输方法，涉及无源光网络光接入技术领域。该网络架构包括控制单元、业务选择单元、光收发阵列单元、时钟单元和若干业务侧光模块；控制单元分别与业务选择单元、光收发阵列单元、时钟单元相连；每个业务侧光模块与一个业务提供设备相连；业务选择单元设置有若干业务数据通道，每个业务侧光模块通过与其业务对应的数据通道与光收发阵列单元相连；光收发阵列单元通过AWG与所有ORU设备的光模块相连。本发明能够将多种不同业务综合接入同一光接入基础设施，完成多种不同业务的上下行信号传输；不仅业务接入能力较强，适用范围比较广泛，而且能够实现资源共享，使用成本较低。

Description

基于波分PON系统的开放网络架构及信号传输方法 技术领域
本发明涉及基于WDM(Wavelength Division and Multiplexing，波分复用)技术的无源光网络光接入技术领域，具体涉及一种基于波分PON系统的开放网络架构及信号传输方法。
背景技术
光接入网络为光纤通信网络中的重要部分，随着光线通信的进步，我国已经部署了大量的光接入设备(例如PON设备、局端OLT设备、ODN设备、ONU设备等)；由于整个PON网络架构是封闭性的，因此PON网络中承载的业务单一。目前，大多数PON网络一般承载固网以太网信号，很少承载移动信号；移动信号在接入段普遍以BBU(Building Baseband Unit，室内基带处理单元)-RRU(Remote Radio Unit，远端射频模块)、直放站等为承载媒介。单个BBU与单个RRU之间一般采用点对点的光纤连接，在BBU和RRU数量较多的情况下，BBU和RRU传输信号所需的光纤较多，进而浪费了大量的光纤资源。
与此同时，随着通信业务发展，封闭的网络架构使用时存在以下缺陷：
(1)对于拥有固网设备的运营商而言，运营商若需要使用移动信号，需要增加移动信号的承载设备、并部署新的网络来承载新增加的移动信号，进而使得设备供应商需要开发新的设备来支持新的网络，不仅增加了运营商的建设成本和设备供应商的开发成本，而且会 造成设备的巨大浪费。
(2)现有网络中所承载的业务种类单一，现有设备和网络架构难以根据业务的需求灵活的增加新业务，不便于人们使用。
(3)目前现有的固定网络和移动网络分别采用各自独立的接入网设施，固定网络和移动网络均需要采用使用寿命为30～40年的接入网的基础设施(例如ODN)，分别采用2套接入网的基础设施使用固定网络和移动网络不仅浪费了大量的资源，降低了网络资源利用率，而且维护成本较高。
发明内容
针对现有技术中存在的缺陷，本发明的目的在于提供一种基于波分PON系统的开放网络架构及信号传输方法，能够将移动业务和固网业务等多种不同业务综合接入同一光接入基础设施，完成多种不同业务的上行信号传输和下行信号传输；不仅业务接入能力较强，适用范围比较广泛，而且能够实现资源共享，减少资源浪费，使用成本较低。
为达到以上目的，本发明采取的技术方案是：一种基于波分PON系统的开放网络架构，包括开放的光线路终端设备OOLT、光分配网络ODN、若干提供不同业务的业务提供设备、若干承载不同业务的光远端单元ORU设备，业务提供设备与OOLT相连，OOLT通过ODN分别与每台ORU设备相连；
所述OOLT包括控制单元、业务选择单元、光收发阵列单元、时钟单元和若干承载不同业务的业务侧光模块；控制单元分别与业务选择单元、光收发阵列单元、时钟单元相连；每个业务侧光模块与一个与之业务对应的业务提供设备相连；业务选择单元设置有若干承载不同业务的业务数据通道，每个业务侧光模块通过与其业务对应的数据 通道与光收发阵列单元相连；
所述ODN包括主干光纤、周期性的阵列波导光栅AWG和若干分支光纤；光收发阵列单元通过主干光纤与AWG相连；AWG通过分支光纤分别与所有ORU设备的光模块相连，1根分支光纤连接1台ORU设备；
在上述技术方案的基础上，所述若干提供不同业务的业务提供设备包括以太网ETH交换机、直放站近端设备和室内基带处理单元BBU中的至少一种。
在上述技术方案的基础上，若干承载不同业务的ORU设备包括光网络单元ONU、直放站远端单元和远端射频模块RRU中的至少一种。
在上述技术方案的基础上，所述光收发阵列单元包括光接收机阵列、解复用器、光发送阵列、复用器和滤波器，业务选择单元分别与光接收机阵列、光发送阵列相连，光接收机阵列通过解复用器与滤波器相连，光发送阵列通过复用器与滤波器相连，滤波器与AWG相连。
一种用于上述开放网络架构的基于波分PON系统的信号传输方法，包括以下步骤：
A、确定信号的流向，若业务侧光模块收到与之对应业务的业务提供设备发送的光信号，则当前信号的流向为下行方向，转到步骤B；若ORU设备收到来自用户的数据，则当前信号的流向为上行方向，转到步骤D；
B、业务侧光模块将光信号经光电转换成电信号，控制单元根据当前电信号确定业务选择单元的数据通道；业务侧光模块将当前电信号通过确定后的数据通道发送至光收发阵列单元；
C、光收发阵列单元将当前电信号经电光转换成光信号，将当前 光信号进行波长复用后，通过主干光纤输出至AWG；AWG对当前光信号进行波长解复用后，通过分支光纤输出至与当前业务侧光模块的业务对应的ORU设备，完成下行信号的传输，结束；
D、ORU设备接收来自用户的数据后，ORU设备的光模块将当前数据经电光转换为光信号，ORU设备通过与当前光信号的工作波长对应的分支光纤，将当前光信号输出至AWG，AWG对当前光信号进行波长复用后，通过主干光纤传输至光收发阵列单元；
E、光收发阵列单元对当前光信号进行波长解复用、并经光电转换成电信号，控制单元和时钟单元根据当前电信号确定业务选择单元的数据通道；光收发阵列单元将当前电信号通过确定后的数据通道，传输至与当前电信号业务对应的业务侧光模块，该业务侧光模块将当前电信号经电光转换成光信号后，输出至与当前光信号业务对应的业务提供设备，完成上行信号的传输，结束。
在上述技术方案的基础上，步骤C中所述AWG对当前光信号进行波长解复用后，通过分支光纤输出至与当前业务侧光模块的业务对应的ORU设备，包括以下步骤：AWG将当前光信号分波至波长与其对应的分支光纤，通过该分支光纤输出至与当前业务侧光模块的业务对应的ORU设备。
在上述技术方案的基础上，步骤D中所述AWG对当前光信号进行波长复用后，通过主干光纤传输至光收发阵列单元，包括以下步骤：AWG对当前光信号的工作波长与其他不同的工作波长合波后，通过主干光纤传输至光收发阵列单元。
在上述技术方案的基础上，其特征在于：若干提供不同业务的业务提供设备包括ETH交换机和BBU，若干承载不同业务的业务侧光模块包括1.25G ETH光模块和3G光模块，若干承载不同业务的ORU 设备单元包括ONU和RRU；
ETH交换机与1.25G ETH光模块相连，1.25G ETH光模块通过ETH接口与业务选择单元相连；业务选择单元设置有承载1.25G ETH业务的数据通道Ch8，Ch8通过1根分支光纤与ONU相连；
BBU与3G光模块相连，3G光模块通过通用公共无线接口CPRI接口与业务选择单元相连；业务选择单元设置有承载3G业务的数据通道Ch1；Ch1通过1根分支光纤与RRU相连。
在上述技术方案的基础上，需要传输以太网信号时，所述基于波分PON系统的信号传输方法包括以下步骤：
确定以太网信号的流向：
若1.25G ETH光模块收到ETH交换机的输出信号，则当前以太网信号的流向为下行方向；1.25G ETH光模块将当前以太网信号经光电转换为电信号；1.25G ETH光模块将当前电信号通过数据通道Ch8输出至光收发阵列单元；数据通道Ch8的对应工作波长为λd/u8，其中d表示承载下行信号，u表示承载上行信号；
光收发阵列单元将当前电信号经电光转换成以太网光信号，将当前光信号与其他不同工作波长的光信号进行波长复用后，通过主干光纤输出至AWG；AWG对波长复用后的多波长以太网光信号进行波长解复用、并通过工作波长为λd8的分支光纤并输出至ONU的接收端，完成下行以太网信号的传输；
若ONU收到来自用户的数据，则当前以太网信号的流向为上行方向；ONU的光模块将当前数据经电光转换为光信号，其输出波长为λu8；ORU设备通过工作波长为λu8的分支光纤，将当前光信号输出至AWG；AWG对当前光信号与其他ORU设备的输出波长进行波长复用后，通过主干光纤输出至的光收发阵列单元；
光收发阵列单元对波长复用后的光信号进行波长解复用、并光电转换为电信号；光收发阵列单元将当前电信号通过数据通道Ch8输出至1.25G ETH光模块，1.25G ETH光模块将当前电信号经电光转换为光信号、并输出至ETH交换机，完成上行以太网信号的传输。
在上述技术方案的基础上，需要传输3G移动信号时，所述基于波分PON系统的信号传输方法包括以下步骤：
确定3G移动信号的流向：
若3G光模块收到BBU的输出信号，则当前3G移动信号的流向为下行方向；3G光模块将当前3G移动信号经光电转换为电信号；3G光模块将当前电信号通过数据通道Ch1输出至光收发阵列单元，数据通道Ch1的对应波长为λd/u1；
光收发阵列单元将当前电信号经电光转换成光信号后，将当前光信号与其他工作波长不同的光信号进行波长复用后，通过主干光纤输出至AWG；AWG将波长复用后的光信号进行波长解复用、并通过工作波长为λd1的分支光纤输出至RRU的接收端，完成下行3G移动信号的传输；
若RRU收到来自用户的数据，则当前3G移动信号的流向为上行方向；RRU的光模块将当前数据经电光转换为光信号，其输出波长为λu1，ORU设备通过工作波长为λu1的分支光纤，将当前光信号输出至AWG；AWG对当前光信号与其他ORU设备的输出波长进行波长复用后，通过主干光纤输出至光收发阵列单元。
光收发阵列单元对波长复用后的光信号进行波长解复用、并光电转换为电信号；光收发阵列单元将当前电信号通过数据通道Ch1输出至3G光模块，3G光模块将当前电信号经电光转换为光信号、并输出至BBU，完成上行3G移动信号的传输。
与现有技术相比，本发明的优点在于：
(1)本发明的网络架构包括业务选择单元，网络架构使用时，不需要更改OOLT物理硬件，业务选择单元能够根据业务需要增加相应的业务、选择相应的光模块、配置与业务对应的数据通道，进而将与不同业务对应的ORU设备接入至所支持的业务分支。因此，本发明的网络架构具有开放性，能够将移动业务和固网业务等多种不同业务综合接入同一光接入基础设施，完成多种不同业务的上行信号传输和下行信号传输；不仅业务接入能力较强，而且提高了网络资源利用率。
(2)本发明的网络架构基于WPON系统，能够节约主干光纤，降低了使用成本。
(3)本发明的网络架构使用时，能够接入多种不同的业务，实现多业务共享，因此本发明能够适用于多种ORU设备，不仅能够提高设备利用率，而且能够节约设备开发商重复开发的开发成本。
(4)与现有技术中需要同时维护固网设备和移动网络设备相比，本发明只需对单一的网络架构进行维护，维护成本较低；而且本发明的网络架构使用标准的物理通信接口，便于用户(各厂家设备)互通和使用。
附图说明
图1为本发明实施例中基于波分PON系统的开放网络架构的结构框图；
图2为本发明实施例中OOLT的结构框图；
图3为本发明实施例中光收发阵列单元的结构框图；
图4为本发明的应用实施例中基于波分PON系统的开放网络架构的结构框图。
具体实施方式
以下结合附图及实施例对本发明作进一步详细说明。
参见图1所示，本发明实施例中的基于波分PON(WDM Passive Optical Network，波分复用无源光纤网络)系统的开放网络架构，包括OOLT(Open Optical Line Termination，开放的光线路终端设备)、ODN(Optical Distribution Network，光分配网络)、若干提供不同业务的业务提供设备、若干承载不同业务的ORU(Optical Remote Unit，光远端单元)设备。业务提供设备与OOLT相连，OOLT通过ODN分别与每台ORU设备相连。
参见图1所示，业务提供设备为ETH(Ethernet，以太网)交换机、直放站近端设备和BBU(Building Baseband Unit，室内基带处理单元)等；在业务侧光模块有相应的业务提供设备的情况下，所有业务均能够自由接入至网络架构。
参见图1所示，ORU设备为RRU(Remote Radio Unit，远端射频模块)、直放站远端单元和型号为SFU/MDU等类型的ONU(Optical Network Unit，光网络单元)等；ORU设备的光模块具有波长自适应功能(即能够根据ODN分支光纤的不同波长将输出波长调谐至相应的波长输出)。
参见图2所示，OOLT包括控制单元、业务选择单元、光收发阵列单元、时钟单元和若干用于连接上联的业务侧光模块。控制单元具有CDR(Clock and Data Recovery，数据时钟恢复)功能，控制单元分别与业务选择单元、光收发阵列单元、时钟单元相连。OOLT中每个业务侧光模块承载的业务均不相同，每个业务侧光模块与一个与之业务对应的业务提供设备相连；业务选择单元设置有若干承载不同业务的业务数据通道，每个业务侧光模块通过与其业务对应的数据通道 与光收发阵列单元相连。
ODN包括主干光纤、AWG(周期性的阵列波导光栅)和若干分支光纤，光收发阵列单元通过主干光纤与AWG相连，AWG通过分支光纤分别与所有ORU设备的光模块相连，1根分支光纤连接1台ORU设备；分支光纤能够允许多个不同波长同时工作。
参见图3所示，光收发阵列单元包括光接收机阵列、解复用器、光发送阵列、复用器和滤波器，业务选择单元分别与光接收机阵列、光发送阵列相连，光接收机阵列通过解复用器与滤波器相连，光发送阵列通过复用器与滤波器相连，滤波器与ODN的AWG相连。
本发明实施例中的用于上述网络架构的基于波分PON系统的信号传输方法，包括以下步骤：
S1：确定信号的流向，若业务侧光模块收到与之对应业务的业务提供设备发送的光信号，则当前信号的流向为下行方向，转到步骤S2；若ORU设备收到来自用户的数据，则当前信号的流向为上行方向，转到步骤S4。
S2：业务侧光模块将光信号经光电转换成电信号，控制单元根据当前电信号确定业务选择单元的数据通道，控制单元控制时钟单元为当前数据通道配置参考时钟；业务侧光模块将当前电信号通过确定后的数据通道发送至光收发阵列单元。
S3：光收发阵列单元将当前电信号经电光转换成光信号，将当前光信号进行波长复用后，通过主干光纤输出至AWG，AWG对当前光信号进行波长解复用后(即将当前光信号分波至波长与其对应的分支光纤)，通过分支光纤输出至与当前业务侧光模块的业务对应的ORU设备，完成下行信号的传输，结束。
S4：ORU设备接收来自用户的数据后，ORU设备的光模块将当 前数据经电光转换为光信号，ORU设备通过与当前光信号的工作波长对应的分支光纤，将当前光信号输出至AWG，AWG对当前光信号进行波长复用后(即与其他ORU设备的输出波长合波)，通过主干光纤传输至光收发阵列单元。
S5：光收发阵列单元对当前光信号进行波长解复用、并经光电转换成电信号，控制单元和时钟单元根据当前电信号确定业务选择单元的数据通道。光收发阵列单元将当前电信号通过确定后的数据通道，传输至与当前电信号业务对应的业务侧光模块，该业务侧光模块将当前电信号经电光转换成光信号后，输出至与当前光信号业务对应的业务提供设备，完成上行信号的传输，结束。
本发明实施例中基于波分PON系统的信号传输方法的工作原理如下：
控制单元主要用来完成整个OOLT设备的管理控制功能，其中包括不同的业务选择不同的数据通道，以及根据通道的业务来配置相应的时钟输出和光模块的管理控制等功能。
确定业务选择单元的数据通道时，时钟单元为业务选择单元提供时钟，由于不同的业务速率不同、对时钟的精度要求不同，因此时钟单元能够根据不同业务的配置为不同的数据通道提供相应的参考时钟输出。
光收发阵列单元的接收端和发送端能够在相同波长或不同波长的情况下工作。光收发阵列单元传送下行方向的信号时，将来自业务选择单元的电信号转成光信号后，发送至ODN；光收发阵列单元传送上行方向的信号时，将来自ODN的光信号转换成电信号后，发送至业务选择单元的相应数据通道。上行的工作波长和下行的工作波长可以相同，也可以不同。上行的工作波长和下行的工作波长由WPON 系统所采用的技术决定；若WPON系统采用波长重用方式，上行的工作波长和下行的工作波长相同；若WPON系统采用可调激光器方式，上行的工作波长和下行的工作波长一般不同。
下面通过一个应用实施例对本发明的基于波分PON系统的开放网络架构及其传输信号方法进行具体说明。
参见图4所示，本应用实施例中的开放网络架构基于波分PON系统；波分PON系统涵盖8个波长对，其中上行8个波长，下行8个波长。上行的工作波长和下行的工作波长不同，上行的工作波长为C波段，下行的工作波长为L波段，进而实现单纤双向传输。本应用实施例传输的业务为1.25Gb/s速率的以太网业务和3G速率的移动业务。
本应用实施例中的基于波分PON系统的开放网络架构包括、OOLT、ODN、若干业务不同的ORU设备和业务提供设备。OOLT包括控制单元、业务选择单元、8路光收发阵列单元、时钟单元和若干业务不同的业务侧光模块。
业务选择单元包括支持多业务、并且带CDR功能的16×16交叉芯片，其包括16个端口：端口1、端口2、端口3、端口4、端口5、端口6、端口7、端口8、端口9、端口10、端口11、端口12、端口13、端口14、端口15、端口16；其中端口1～端口8分别连接一个业务光模块，端口9～端口16均与8路光收发阵列单元相连。
时钟单元包括时钟选择器、49.152MMhz晶振和125Mhz晶振，49.152MMhz晶振和125Mhz晶振均通过时钟选择器与业务选择单元相连。
业务提供设备包括ETH交换机和BBU，业务侧光模块包括1.25G ETH光模块和3G光模块，ORU设备单元包括ONU和RRU。ONU 与AWG连接的光模块、RRU与AWG连接的光模块均具有波长自动适应功能。
ETH交换机与1.25G ETH光模块相连，1.25G ETH光模块通过ETH接口与端口1相连；端口1与端口16形成承载1.25G ETH业务的数据通道Ch8，Ch8通过1根分支光纤与ONU相连。
BBU与3G光模块相连，3G光模块通过CPRI接口(通用公共无线接口)与端口8相连；端口8与端口9形成承载3G业务的数据通道Ch1，Ch1通过1根分支光纤与RRU相连。
ODN包括主干光纤、AWG和分支光纤，8路光收发阵列单元通过主干光纤与AWG相连，AWG分别通过2根分支光纤与ONU、RRU相连；每根分支光纤均允许一个L波段的波长和一个C波段的波长同时工作，实现了单纤双向的传输。
本应用实施例中的基于波分PON系统的信号传输以太网信号的方法包括以下步骤：
确定以太网信号的流向：
若1.25G ETH光模块收到ETH交换机的输出信号，则当前以太网信号的流向为下行方向。1.25G ETH光模块将当前以太网信号经光电转换为电信号；控制单元控制时钟单元为数据通道Ch8配置125Mhz的时钟，1.25G ETH光模块将当前电信号通过数据通道Ch8(即从端口1输入，从端口16输出)输出至8路光收发阵列单元，数据通道Ch8的对应波长为λd/u8(d表示承载下行信号，u表示承载上行信号)。
8路光收发阵列单元将当前电信号经电光转换成以太网光信号后，工作在波长为λd8的分支，λd8与其他不同工作波长(λd1～λd7)的光信号进行波长复用后，通过主干光纤输出至AWG，AWG对波长 复用后的多波长以太网光信号进行波长解复用(即分波)，波长解复用后的光信号工作在各自的分支光纤，Ch8的光信号通过λd8的分支光纤输出至ONU的接收端，完成下行以太网信号的传输。
若ONU收到来自用户的数据，则当前以太网信号的流向为上行方向。ONU的光模块将当前数据经电光转换为光信号，其输出波长为λu8。ORU设备通过工作波长为λu8的分支光纤，将当前光信号输出至AWG；AWG对当前光信号与其他ORU设备的输出波长进行波长复用后(即波长合波)，通过主干光纤输出至的8路光收发阵列单元。
8路光收发阵列单元对波长复用后的光信号进行波长解复用(即波长分波)、并光电转换为电信号；8路光收发阵列单元将当前电信号通过数据通道Ch8(即从端口16输入，从端口1输出)输出至1.25GETH光模块，1.25G ETH光模块将当前电信号经电光转换为光信号、并输出至ETH交换机，完成上行以太网信号的传输。
本应用实施例中的基于波分PON系统的信号传输3G移动信号信号的方法包括以下步骤：
确定3G移动信号的流向：
若3G光模块收到BBU的输出信号，则当前3G移动信号的流向为下行方向。3G光模块将当前3G移动信号经光电转换为电信号；控制单元控制时钟单元为数据通道Ch1配置49.125Mhz(或者与3G速率具有倍数关系的频率)的时钟，3G光模块将当前电信号通过数据通道Ch1(即从端口8输入，从端口9输出)输出至8路光收发阵列单元，数据通道Ch1的对应波长为λd/u1。
8路光收发阵列单元将当前电信号经电光转换成光信号后，工作波长为λd1，λd1与其他不同工作波长的光信号进行波长复用后，通 过主干光纤输出至AWG、AWG将波长复用后的光信号进行波长解复用、并通过工作波长为λd1的分支光纤输出至RRU的接收端，完成下行3G移动信号的传输。
若RRU收到来自用户的数据，则当前3G移动信号的流向为上行方向。RRU的光模块将当前数据经电光转换为光信号，其输出波长为λu1。ORU设备通过工作波长为λu1的分支光纤，将当前光信号输出至AWG。AWG对当前光信号与其他ORU设备的输出波长进行波长复用后(即波长合波)，通过主干光纤输出至8路光收发阵列单元。
8路光收发阵列单元对波长复用后的光信号进行波长解复用、并光电转换为电信号；8路光收发阵列单元将当前电信号通过数据通道Ch1(即从端口9输入，从端口8输出)输出至3G光模块，3G光模块将当前电信号经电光转换为光信号、并输出至BBU，完成上行3G移动信号的传输。
本发明不局限于上述实施方式，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围之内。本说明书中未作详细描述的内容属于本领域专业技术人员公知的现有技术。

Claims (10)

  1. 一种基于波分PON系统的开放网络架构，包括开放的光线路终端设备OOLT、光分配网络ODN、若干提供不同业务的业务提供设备、若干承载不同业务的光远端单元ORU设备，业务提供设备与OOLT相连，OOLT通过ODN分别与每台ORU设备相连；其特征在于：
    所述OOLT包括控制单元、业务选择单元、光收发阵列单元、时钟单元和若干承载不同业务的业务侧光模块；控制单元分别与业务选择单元、光收发阵列单元、时钟单元相连；每个业务侧光模块与一个与之业务对应的业务提供设备相连；业务选择单元设置有若干承载不同业务的业务数据通道，每个业务侧光模块通过与其业务对应的数据通道与光收发阵列单元相连；
    所述ODN包括主干光纤、周期性的阵列波导光栅AWG和若干分支光纤；光收发阵列单元通过主干光纤与AWG相连；AWG通过分支光纤分别与所有ORU设备的光模块相连，1根分支光纤连接1台ORU设备；
  2. 如权利要求1所述的基于波分PON系统的开放网络架构，其特征在于：所述若干提供不同业务的业务提供设备包括以太网ETH交换机、直放站近端设备和室内基带处理单元BBU中的至少一种。
  3. 如权利要求2所述的基于波分PON系统的开放网络架构，其特征在于：若干承载不同业务的ORU设备包括光网络单元ONU、直放站远端单元和远端射频模块RRU中的至少一种。
  4. 如权利要求1所述的基于波分PON系统的开放网络架构，其特征在于：所述光收发阵列单元包括光接收机阵列、解复用器、光发送阵列、复用器和滤波器，业务选择单元分别与光接收机阵列、光发 送阵列相连，光接收机阵列通过解复用器与滤波器相连，光发送阵列通过复用器与滤波器相连，滤波器与AWG相连。
  5. 一种用于权利要求1至4任一项所述开放网络架构的基于波分PON系统的信号传输方法，其特征在于，包括以下步骤：
    A、确定信号的流向，若业务侧光模块收到与之对应业务的业务提供设备发送的光信号，则当前信号的流向为下行方向，转到步骤B；若ORU设备收到来自用户的数据，则当前信号的流向为上行方向，转到步骤D；
    B、业务侧光模块将光信号经光电转换成电信号，控制单元根据当前电信号确定业务选择单元的数据通道；业务侧光模块将当前电信号通过确定后的数据通道发送至光收发阵列单元；
    C、光收发阵列单元将当前电信号经电光转换成光信号，将当前光信号进行波长复用后，通过主干光纤输出至AWG；AWG对当前光信号进行波长解复用后，通过分支光纤输出至与当前业务侧光模块的业务对应的ORU设备，完成下行信号的传输，结束；
    D、ORU设备接收来自用户的数据后，ORU设备的光模块将当前数据经电光转换为光信号，ORU设备通过与当前光信号的工作波长对应的分支光纤，将当前光信号输出至AWG，AWG对当前光信号进行波长复用后，通过主干光纤传输至光收发阵列单元；
    E、光收发阵列单元对当前光信号进行波长解复用、并经光电转换成电信号，控制单元和时钟单元根据当前电信号确定业务选择单元的数据通道；光收发阵列单元将当前电信号通过确定后的数据通道，传输至与当前电信号业务对应的业务侧光模块，该业务侧光模块将当前电信号经电光转换成光信号后，输出至与当前光信号业务对应的业务提供设备，完成上行信号的传输，结束。
  6. 如权利要求5所述的基于波分PON系统的信号传输方法，其特征在于：步骤C中所述AWG对当前光信号进行波长解复用后，通过分支光纤输出至与当前业务侧光模块的业务对应的ORU设备，包括以下步骤：AWG将当前光信号分波至波长与其对应的分支光纤，通过该分支光纤输出至与当前业务侧光模块的业务对应的ORU设备。
  7. 如权利要求5所述的基于波分PON系统的信号传输方法，其特征在于：步骤D中所述AWG对当前光信号进行波长复用后，通过主干光纤传输至光收发阵列单元，包括以下步骤：AWG对当前光信号的工作波长与其他不同的工作波长合波后，通过主干光纤传输至光收发阵列单元。
  8. 如权利要求5所述的基于波分PON系统的信号传输方法，其特征在于：若干提供不同业务的业务提供设备包括ETH交换机和BBU，若干承载不同业务的业务侧光模块包括1.25G ETH光模块和3G光模块，若干承载不同业务的ORU设备单元包括ONU和RRU；
    ETH交换机与1.25G ETH光模块相连，1.25G ETH光模块通过ETH接口与业务选择单元相连；业务选择单元设置有承载1.25G ETH业务的数据通道Ch8，Ch8通过1根分支光纤与ONU相连；
    BBU与3G光模块相连，3G光模块通过通用公共无线接口CPRI接口与业务选择单元相连；业务选择单元设置有承载3G业务的数据通道Ch1；Ch1通过1根分支光纤与RRU相连。
  9. 如权利要求8所述的基于波分PON系统的信号传输方法，其特征在于：需要传输以太网信号时，所述基于波分PON系统的信号传输方法包括以下步骤：
    确定以太网信号的流向：
    若1.25G ETH光模块收到ETH交换机的输出信号，则当前以太 网信号的流向为下行方向；1.25G ETH光模块将当前以太网信号经光电转换为电信号；1.25G ETH光模块将当前电信号通过数据通道Ch8输出至光收发阵列单元；数据通道Ch8的对应工作波长为λd/u8，其中d表示承载下行信号，u表示承载上行信号；
    光收发阵列单元将当前电信号经电光转换成以太网光信号，将当前光信号与其他不同工作波长的光信号进行波长复用后，通过主干光纤输出至AWG；AWG对波长复用后的多波长以太网光信号进行波长解复用、并通过工作波长为λd8的分支光纤并输出至ONU的接收端，完成下行以太网信号的传输；
    若ONU收到来自用户的数据，则当前以太网信号的流向为上行方向；ONU的光模块将当前数据经电光转换为光信号，其输出波长为λu8；ORU设备通过工作波长为λu8的分支光纤，将当前光信号输出至AWG；AWG对当前光信号与其他ORU设备的输出波长进行波长复用后，通过主干光纤输出至的光收发阵列单元；
    光收发阵列单元对波长复用后的光信号进行波长解复用、并光电转换为电信号；光收发阵列单元将当前电信号通过数据通道Ch8输出至1.25G ETH光模块，1.25G ETH光模块将当前电信号经电光转换为光信号、并输出至ETH交换机，完成上行以太网信号的传输。
  10. 如权利要求8所述的基于波分PON系统的信号传输方法，其特征在于：需要传输3G移动信号时，所述基于波分PON系统的信号传输方法包括以下步骤：
    确定3G移动信号的流向：
    若3G光模块收到BBU的输出信号，则当前3G移动信号的流向为下行方向；3G光模块将当前3G移动信号经光电转换为电信号；3G光模块将当前电信号通过数据通道Ch1输出至光收发阵列单元，数 据通道Ch1的对应波长为λd/u1；
    光收发阵列单元将当前电信号经电光转换成光信号后，将当前光信号与其他工作波长不同的光信号进行波长复用后，通过主干光纤输出至AWG；AWG将波长复用后的光信号进行波长解复用、并通过工作波长为λd1的分支光纤输出至RRU的接收端，完成下行3G移动信号的传输；
    若RRU收到来自用户的数据，则当前3G移动信号的流向为上行方向；RRU的光模块将当前数据经电光转换为光信号，其输出波长为λu1，ORU设备通过工作波长为λu1的分支光纤，将当前光信号输出至AWG；AWG对当前光信号与其他ORU设备的输出波长进行波长复用后，通过主干光纤输出至光收发阵列单元。
    光收发阵列单元对波长复用后的光信号进行波长解复用、并光电转换为电信号；光收发阵列单元将当前电信号通过数据通道Ch1输出至3G光模块，3G光模块将当前电信号经电光转换为光信号、并输出至BBU，完成上行3G移动信号的传输。
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