WO2011009368A1 - 无源光网络中传输信息的方法、装置和系统 - Google Patents

无源光网络中传输信息的方法、装置和系统 Download PDF

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Publication number
WO2011009368A1
WO2011009368A1 PCT/CN2010/074772 CN2010074772W WO2011009368A1 WO 2011009368 A1 WO2011009368 A1 WO 2011009368A1 CN 2010074772 W CN2010074772 W CN 2010074772W WO 2011009368 A1 WO2011009368 A1 WO 2011009368A1
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WIPO (PCT)
Prior art keywords
optical signal
oam information
downlink
sent
olt
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PCT/CN2010/074772
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English (en)
French (fr)
Inventor
李昆
操时宜
周建林
叶敏
Original Assignee
华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP20100801927 priority Critical patent/EP2451096B1/en
Publication of WO2011009368A1 publication Critical patent/WO2011009368A1/zh
Priority to US13/356,430 priority patent/US9008516B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/04Network management architectures or arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/27Arrangements for networking
    • H04B10/272Star-type networks or tree-type networks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/34Signalling channels for network management communication
    • H04L41/344Out-of-band transfers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • H04Q11/0067Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • H04Q2011/0079Operation or maintenance aspects

Definitions

  • the present application claims to be submitted to the Chinese Patent Office on July 24, 2009, the application number is CN 20091008981 1.2, and the invention is entitled "Method and device for transmitting information in a passive optical network"
  • the priority of the Chinese Patent Application the entire disclosure of which is incorporated herein by reference.
  • the present invention relates to the field of PON (Passive Optical Network) technology, and in particular, to a method, device and system for transmitting information in a PON.
  • PON Passive Optical Network
  • the composition of the P0N system and its location in the traditional network architecture are shown in Figure 1.
  • the P0N system mainly includes: OLT (Optical Line Terminals), ONU (Optical Network Unit), and optical division. Part of the device and ODN (Optical Distribution Network).
  • the OLT and the optical splitter are connected by a trunk fiber, and the optical splitter realizes point-to-multipoint optical power distribution, and is connected to multiple 0NUs through multiple branch fibers.
  • the backbone fiber, optical splitter, and branch fiber between the OLT and the ONU are collectively referred to as 0DN.
  • the direction from 0LT to 0NU is called the downstream direction
  • the direction from 0NU to 0LT is called the upstream direction.
  • the split ratio of the optical splitter is from 1:16, 1:32 to 1:64, and the maximum can be 1:128.
  • the number of 0NUs that 0LT is connected through the optical splitter is small, covering The radius does not exceed 20km, resulting in a large number of OLTs in the traditional network architecture, and the location area is remote and scattered, which is inconvenient to manage and maintain, and the equipment investment and maintenance costs are high.
  • P0N's remoteness helps simplify access
  • the network level such as layer and aggregation layer, the number of network nodes is reduced, the number of users carried by a single OLT is increased, and the cost is maximized, thereby ultimately reducing equipment investment, saving management and maintenance costs.
  • the basic architecture of a LR-PON (Long Reach PON) is shown in Figure 2.
  • the RE device can be an electrical relay or an all-optical relay. After joining the RE device, the traditional 0DN network is split into two 0DN networks, namely 0DN1 and 0DN2.
  • the all-optical RE device performs functions such as amplification of the optical signal.
  • the active RE device is introduced, and the stability and reliability of the entire 0DN network are not as good as those of the previous passive optical path node;
  • the fiber transmission path is extended from the previous 20km range to over 100km, introducing the probability of failure of the long-distance fiber path;
  • the coverage is expanded.
  • the number of users connected to the OLT is several times to several tens of times.
  • the business impact of the fault is wider;
  • the RE device is added to divide the fiber path into two or more segments. If a segment fails, you need to locate the fault cause and fault point as soon as possible so that it can be processed as soon as possible.
  • a solution for establishing a communication channel between an RE device and an OLT device in the prior art mainly includes: placing the 0AM information between the RE device and the OLT device into the uplink and downlink GTC (GP0N Transmission Converge) or In the GEM (GPON Encapsulation Mode) frame, in order to not affect the existing customer service, the line rate between the RE device and the 0LT device can be increased, and the increased line rate can be used to accommodate The above OAM information.
  • the OLT and the RE device perform operations such as photoelectric conversion, deframing/framing, and electro-optical conversion, and take out the above OAM information from the GTC or GEM frame.
  • the RE device and the OLT device need to perform optical-electrical-to-optical conversion, deframing/framing, etc., in order to extract the above OAM information from the GTC or GEM frame, which is complicated and costly.
  • Another solution for establishing a communication channel between an RE device and an OLT device in the prior art mainly includes: establishing a communication channel between the all-optical RE device and the OLT device using a new wavelength different from the upstream and downstream wavelengths of the PON, RE The OAM information between the device and the OLT device is transmitted through the communication channel established by the newly added wavelength.
  • Embodiments of the present invention provide a method, apparatus, and system for transmitting information in a PON, so as to transmit OAM between an RE device and an OLT device without affecting the existing PON system and increasing the line rate of the PON. information.
  • a remote RE device includes: a downlink optical signal demodulation unit, configured to demodulate a downlink optical signal sent by the optical line terminal OLT device, and obtain a downlink operation that is sent by the OLT device to the RE device included in the downlink optical signal, Manage and maintain OAM information;
  • An OAM information processing unit configured to receive the downlink sent by the downlink optical signal demodulation unit OAM information
  • control unit configured to generate uplink OAM information that needs to be reported to the OLT device, and send the information to the OAM information processing unit, and receive the downlink OAM information sent by the OAM information processing unit, and an uplink optical signal modulation unit, configured to The uplink OAM information sent by the OAM information processing unit modulates the downlink optical signal sent by the OLT device, and sends the optical signal including the uplink OAM information after the modulation processing to the OLT device.
  • An OLT device including:
  • a RE return optical signal extracting unit configured to extract, from the optical signal received by the OLT device, the optical signal sent back by the RE device;
  • An optical signal demodulation unit configured to demodulate the optical signal sent by the RE return optical signal extracting unit, to obtain uplink OAM information in the optical signal
  • An OAM information processing unit configured to receive uplink OAM information sent by the optical signal demodulation unit;
  • a control unit configured to generate downlink OAM information that needs to be sent to the RE device, and send the information to the OAM information processing unit, and receive the uplink OAM information sent by the OAM information processing unit.
  • the optical signal modulation unit is configured to use the OAM according to the OAM.
  • the downlink OAM information sent by the information processing unit modulates the downlink optical signal sent to the RE device, and transmits the modulated optical signal including the downlink OAM information to the RE device.
  • a communication system in a bare-edge optical network comprising: the RE device and the OLT device,
  • the RE device performs a modulation process on the downlink optical signal sent by the OLT device according to the uplink OAM information that needs to be reported to the OLT device, and sends the modulated optical signal including the uplink OAM information to the OLT device;
  • the OLT device sends the downlink OAM information sent to the RE device to the OLT device according to the need.
  • the downlink optical signal sent to the RE device is subjected to modulation processing, and the modulated processing includes the downlink
  • An optical signal of the OAM information is sent to the RE device.
  • a method for transmitting OAM information to an optical line terminal OLT device by a remote RE device includes: acquiring uplink OAM information that the RE device needs to report to the OLT device, and performing modulation processing on the downlink optical signal sent by the OLT device according to the uplink OAM information Transmitting, by the OLT device, the optical signal that includes the uplink OAM information to the OLT device, and acquiring the downlink OAM information that the OLT device needs to send to the RE device, and sending the OLT device to the RE device according to the downlink OAM information.
  • the downlink optical signal is subjected to modulation processing, and the modulated optical signal including the downlink OAM information is transmitted to the RE device.
  • the RE device uses the OAM information to modulate the downlink optical signal sent by the OLT device, and sends the modulated optical signal back to the OLT device.
  • the OLT device uses the OAM information to modulate the downlink optical signal sent to the RE device.
  • the OAM information can be transmitted between the RE device and the OLT device without affecting the existing PON system and the line rate of the PON is not increased, and the OLT device can manage and control the all-optical RE device.
  • FIG. 1 is a schematic diagram of a composition of a PON system in the prior art and its position in a conventional network architecture
  • FIG. 2 is a schematic diagram of a basic architecture of an LR-PON in the prior art
  • FIG. 3 is a schematic diagram of transmitting a management letter between an RE device and an OLT device according to Embodiment 1 of the present invention; Schematic diagram of the system of interest;
  • FIG. 4 is a schematic structural diagram of an all-optical RE device according to Embodiment 2 of the present invention.
  • FIG. 5 is a schematic structural diagram of an OLT device according to Embodiment 3 of the present invention.
  • the uplink OAM information that the RE device needs to report to the OLT device is obtained, and the downlink optical signal sent by the OLT device is modulated according to the uplink OAM information, and the uplink processed by the modulation process is included.
  • the optical signal of the OAM information is sent to the OLT device;
  • the structure of the system for transmitting management information between the RE device and the OLT device provided by this embodiment is shown in Fig. 3, and includes an all-optical RE device and an OLT device.
  • An OAM processing module is added to the all-optical RE device, and the OAM processing module separates a downlink optical signal sent by the OLT device to the all-optical RE device, and modulates the optical signal, and may be in the optical signal during the modulation process. Encapsulate the upstream OAM information that needs to be transmitted to the OLT. Then, the modulated optical signal is sent back to the OLT to establish a communication channel of the all-optical RE device to the OLT device.
  • An OAM processing module is also added to the OLT device.
  • the OAM processing module directly modulates the continuous optical signal in the downlink direction sent by the OLT device to the all-optical RE device.
  • the optical signal may be encapsulated and transmitted to the all-optical RE. Downstream OAM information of the device.
  • the modulated optical signal is sent to the all-optical RE device, thereby establishing a communication channel of the OLT device to the all-optical RE device.
  • a two-way communication channel between the OLT device and the all-optical RE device is established in the optical layer, and the communication channel can be used in the OLT device and the all-optical RE device. Transfer OAM information between.
  • the modulation method of the optical signal by the OAM processing module in the all-optical R E device and the 0 LT device may be various methods such as frequency modulation, amplitude modulation, amplitude keying, frequency shift keying, and phase shift keying.
  • the above modulation process for optical signals mainly includes:
  • the upstream optical signal modulation unit converts the OAM information into a corresponding voltage signal.
  • the binary “1” corresponds to the output voltage value at which the output VOA does not attenuate any of the optical signals passing through it
  • the binary "0" corresponds to the control voltage value at which the output VOA attenuates 5% of the optical signal passing through it.
  • the above voltage signal is sent to the control terminal of the VOA to control the amount of attenuation of the optical signal passing through the VOA.
  • the OAM information is modulated onto the optical signal.
  • the method of frequency modulation is similar, for example, the binary “1” is represented by 10KHz of 0.1 ms duration, and the binary "0" is represented by 20KHz of 0.1 ms duration.
  • each device of the all-optical RE device may be assigned a different device identifier, and the OLT device sends information to the specific all-optical RE device according to the device identifier; likewise, the all-optical RE device is sent to the OLT device.
  • the device also carries the device identification of the device.
  • the all-optical RE device Before the all-optical RE device sends information to the OLT device, it needs to detect whether the next-level all-optical RE device is transmitting information. If the information is being sent, it needs to wait until the information of the next-level all-optical RE device is sent before the OLT device can be sent. send Message. To avoid collision of optical signals.
  • only the communication channel of the all-optical RE device to the OLT device or the communication channel of the OLT device to the all-optical RE device may be established as needed.
  • This embodiment can solve the problem of unmodulation caused by no optical signal in the uplink burst interval in the PON system, and appropriately select the modulation amplitude of the optical signal between the all-optical RE device and the OLT device, so as to ensure that the all-optical RE device and the OLT are not affected.
  • the optical signal of the device is received, so it will not affect the existing PON network. Network.
  • the average transmitted optical power of Class A defined in G.894 is between 0 dBm and 4 dBm.
  • the average emitted optical power of the actual OLT device is about 2.5 dBm, and the minimum extinction ratio is 10 dB.
  • the modulation amplitude of 5% can be selected, and the average optical power of the transmitting end is reduced by 0.22 dB at most, which is equivalent to the insertion loss of a fiber connector or a 500-meter-long fiber, as long as the optical power budget of the entire PON system is 0.22.
  • the redundancy of dB has a strong enough optical signal at the receiving end.
  • the modulation amplitude at the time of transmission is controlled from 1% to 5%.
  • FIG. 4 is a schematic structural diagram of an all-optical RE device provided by the embodiment, including: a downlink optical signal separator, a downlink optical signal demodulation, an OAM information processing, an uplink optical signal modulation, a control unit, and an optical signal distribution unit.
  • the main features of each module include:
  • the downlink optical signal separator unit is configured to separate the optical signals in the downlink direction that are sent by the OLT device to the all-optical RE device into three channels, and respectively send them to the downlink optical signal demodulation unit, the uplink optical signal modulation unit, and the downlink direction light.
  • Amplifier is configured to separate the optical signals in the downlink direction that are sent by the OLT device to the all-optical RE device into three channels, and respectively send them to the downlink optical signal demodulation unit, the uplink optical signal modulation unit, and the downlink direction light.
  • Amplifier is configured to separate the optical signals in the downlink direction that are sent by the OLT device to the all-optical RE device into three channels, and respectively send them to the downlink optical signal demodulation unit, the uplink optical signal modulation unit, and the downlink direction light.
  • a downlink optical signal demodulating unit configured to extract an envelope from a downlink optical signal transmitted from the OLT device and transmitted by the downlink optical signal splitter unit, and transmit the downlink OAM information to the OAM corresponding to the optical signal modulation of the OLT device Information processing unit.
  • the OAM information processing unit is configured to perform an adaptation process on the downlink OAM information of the all-optical RE device by the OLT device transmitted by the downlink optical signal demodulation unit, where the adaptation process mainly includes: information according to the control unit of the all-optical RE device The format requires the necessary format conversion for the above downlink OAM information. Then, the downlink OAM information after the adaptation processing is sent to the control unit of the all-optical RE device; The uplink OAM information that needs to be reported to the OLT device is collected from the control unit of the all-optical RE device, and the uplink OAM information is adapted to be sent to the uplink optical signal modulation unit of the all-optical RE device. .
  • the all-optical RE device When the all-optical RE device is cascaded, it is determined whether the next-level all-optical RE device is transmitting information. If yes, after the next-level all-optical RE device sends the information, the 0AM after the adaptation process is performed. The information is sent to the upstream optical signal modulation unit of the all-optical RE device.
  • the optical signal modulation unit is configured to prevent the optical signal from being modulated by the OAM information processing unit, and the uplink OAM information that needs to be sent to the OLT device is subjected to modulation processing such as encapsulation and conversion, and the modulated optical signal is transmitted to the optical signal distribution. unit. Including: OAM information encapsulation module, OAM information modulation module, and Variable Optical Attenuator (VOA).
  • the OAM information encapsulating module in the uplink optical signal modulating unit is configured to encapsulate the received uplink 0AM information, and transmit the encapsulated uplink 0AM information to the 0AM information modulation module; and the 0AM information modulation in the uplink optical signal modulating unit.
  • a module configured to modulate uplink 0AM information transmitted by the 0AM information encapsulating module, convert the uplink 0AM information into a V0A control signal, and transmit the control signal to V0A;
  • the V0A in the upstream optical signal modulating unit is configured to change the intensity of the downlink optical signal transmitted by the 0LT device of the V0A according to the control signal transmitted by the 0AM information modulation module, and output the downlink optical signal with the changed intensity.
  • control unit configured to generate uplink 0AM information that needs to be reported to the 0LT device, and send the information to the 0AM information processing unit, and receive the downlink 0AM information sent by the 0AM information processing unit;
  • the optical signal distribution unit is configured to send the modulated optical signal transmitted by the upstream optical signal modulation unit to the 0LT device through the coupler, and the return path is related to the Diplexer design of the all-optical RE device,
  • the Diplexer inside the optical RE device can be a wavelength filter or Ring shaper.
  • the above OAM information processing unit may be integrated inside the control unit of the all-optical RE device, or may be separately set independently of the control unit.
  • FIG. 5 A schematic structural diagram of an OLT device provided in this embodiment is shown in FIG. 5, and includes the following modules: RE echo optical signal extraction, optical signal demodulation, OAM information processing unit, optical signal demodulation unit, and control unit.
  • the RE loopback optical signal extracting unit is configured to extract an optical signal returned by the RE device from the optical signal received by the OLT, and transmit the optical signal to the optical signal demodulating unit.
  • the optical signal demodulation unit is configured to extract a modulation signal from the optical signal transmitted by the RE return optical signal extraction unit, and perform a demodulation process corresponding to the modulation of the all-optical RE device to obtain a total light in the modulated signal.
  • the uplink OAM information reported by the RE device is transmitted to the OAM information processing unit.
  • filtering FFT (Fast Fourier Transform) transform.
  • the OAM information processing unit is configured to perform an adaptation process on the uplink OAM information transmitted by the optical signal demodulation unit, and then send the information to the control unit of the OLT device, where the adaptation process mainly includes: information according to the control unit of the OLT device
  • the format requires the necessary format conversion for the above uplink OAM information.
  • the downlink OAM information that needs to be sent to the RE device is collected from the control unit of the OLT device, and the downlink OAM information is adapted and processed, and then sent to the optical signal modulation unit.
  • the optical signal modulating unit is configured to perform modulation processing such as encapsulation and conversion on the downlink OAM information that is transmitted to the RE and transmitted by the OAM information processing unit, to form a control signal of the VOA, and use the control signal to change the OLT device sent by the VOA.
  • the strength of the downlink optical signal is implemented, so that the downlink OAM information is sent to the all-optical RE device.
  • OAM information encapsulation module Including: OAM information encapsulation module, OAM letter Information Modulation Module and VOA.
  • the OAM information encapsulating module in the optical signal modulating unit is configured to encapsulate the received downlink OAM information, and transmit the encapsulated downlink OAM information to the OAM information modulation module.
  • the OAM information modulation module in the optical signal modulating unit is configured to modulate downlink OAM information transmitted by the OAM information encapsulating module, convert the downlink OAM information into a VOA control signal, and transmit the control signal to the VOA;
  • the VOA in the optical signal modulating unit is configured to change the strength of the downlink optical signal transmitted by the OLT device of the VOA according to the control signal transmitted by the OAM information modulation module, and output the downlink optical signal with the changed strength.
  • a control unit configured to generate downlink OAM information that needs to be sent to the RE device, and send the information to the OAM information processing unit, and receive the uplink OAM information sent by the OAM information processing unit.
  • the optical modulation signal sent by the optical signal modulation unit may also be received by the optical signal demodulation unit in the OLT device. Therefore, the optical modulation modes of the OLT device and the all-optical RE device need to be different. For example, when frequency modulation is used, the OLT device and the all-optical RE device use different frequency points, and the optical signal demodulation unit of the OLT device filters the modulated signal emitted by the OLT device with a band pass filter.
  • the internal Diplexer in the above OLT device can be a coupler, a wavelength filter or a ring.
  • the above OAM information processing unit may be integrated inside the control unit of the OLT device, or may be separately set independently of the control unit.
  • Embodiment 4 The processing procedure of a method for transmitting uplink OAM information to a 0 LT device by the RE device provided by the embodiment includes the following steps:
  • Step s1 The all-optical RE device generates uplink OAM information that needs to be transmitted to the OLT device, and performs adaptation processing on the uplink OAM information.
  • the foregoing adaptation process mainly includes: performing necessary format conversion on the OAM information according to an information format requirement of an uplink optical signal modulation unit of the all-optical RE device.
  • the all-optical RE device is cascaded, it is also necessary to determine whether other all-optical RE devices are transmitting data. If yes, after waiting for data transmission of other all-optical RE devices, the uplink OAM information is processed.
  • Step s2 Encapsulate the uplink OAM information after the adaptation process to adapt to a specific physical transmission channel.
  • PPP Point-to-Point Protocol
  • HDLC High Level Data Link Control
  • LAPS Link Access Procedure-SDH, SDH link
  • GFP Generic Framing Procedure
  • GMP Generic Mapping Procedure
  • custom format to determine the start/end position and adaptation channel rate of the above uplink 0AM information .
  • the encapsulated 0AM information is converted into a V0A control signal according to the set modulation mode, and the control signal is transmitted to V0A.
  • the all-optical RE device also separates part of the optical signal from the continuous downstream optical signal of the PON system, and transmits the partial optical signal to the above V0A.
  • the V0A changes the intensity of the partial optical signal passing through the V0A according to the received control signal, and superimposes the above-mentioned 0AM information on the partial optical signal to complete the process of modulating the partial optical signal.
  • the V0A modulated intensity optical signal is then coupled to the upstream direction by a coupler and sent to the OLT device.
  • Step s4 performing signal amplification, band pass filtering, and removing interference signal processing on the optical signal, and then de-encapsulating the 0AM information and de-encapsulating the 0AM information opposite to the all-optical RE device to obtain all-optical light.
  • Uplink OAM information sent by the RE device Thereby, the uploading process of the uplink 0AM information of the all-optical RE device to the OLT device is completed.
  • the VOA of the all-optical RE device cannot use the optical signal emitted by the ONU.
  • the all-optical RE device separates part of the optical signal from the continuous downlink optical signal of the PON system, and sends it to the VOA of the all-optical RE device for amplitude modulation, thereby ensuring that the input optical signal of the VOA in the all-optical RE device is continuous,
  • the OAM information is continuously transmitted to the OLT device using the VOA.
  • the processing procedure of the method for transmitting the downlink OAM information to the all-optical RE device by the OLT device provided by the embodiment includes the following steps: Step p1: The OLT device generates downlink OAM information that needs to be transmitted to the all-optical RE device, and The downlink OAM information is subjected to adaptation processing.
  • the foregoing adaptation process mainly includes: performing necessary format conversion on the downlink OAM information according to an information format requirement of an optical signal modulation unit of the OLT device.
  • the downlink OAM information after the adaptation processing is encapsulated to adapt to a specific physical transmission channel.
  • the downlink OAM information is encapsulated in a format such as PPP, HDLC, LAPS, GFP, GMP, or custom to determine the start/end position of the downlink OAM information.
  • the encapsulated downlink information is converted into a VOA control signal according to the set modulation mode, and the control signal is transmitted to the VOA.
  • the VOA changes the strength of the downlink optical signal transmitted by the OLT device of the VOA according to the received control signal, and superimposes the downlink OAM information on the downlink optical signal to complete the process of modulating the downlink optical signal. Then, the modulated downlink optical signal is sent to the all-optical RE device. Therefore, the downlink OAM information is sent to the all-optical RE device.
  • Step p3 After the all-optical RE device receives the modulated optical signal from the OLT device, the light is The signal is demodulated by the OAM information and decapsulated by the OAM information, and the downlink OAM information sent by the OLT device is obtained. The process of sending the downlink OAM information of the OLT device to the all-optical RE device is completed.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).
  • the embodiment of the present invention realizes the transmission of OAM information between the RE device and the OLT device without affecting the existing PON system and the line rate of the PON, and realizes the management and control function of the OLT device to the all-optical RE device. .
  • the function of the all-optical RE device can be extended and improved, for example, the PON protection is better supported, the protection switching speed and the success rate of the PON system are improved, and the embodiment of the present invention does not affect the existing PON system, and can be down.
  • the embodiments of the present invention are also applicable to a burst all-optical repeater that performs OAM for other types of optical burst relay devices, such as WDM (wavelength division multiplex)-PON.

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Description

无源光网络中传输信息的方法、 装置和系统 本申请要求于 2009年 7月 24日提交中国专利局、 申请号为 CN 20091008981 1.2、 发明名称为"无源光网络中传输信息的方法、 装置和系统" 的中国专利申请的优先权, 其全部内容通过引用结合在本申请中。 技术领域 本发明涉及 PON ( Passive Optical Network, 无源光网络)技术领域, 尤其涉及一种 PON中传输信息的方法、 装置和系统。 背景技术 随着视频点播、 高清晰度电视、 网络游戏等新兴业务的兴起, 用户对带 宽的需求日益增长, 发展光纤到户可有效地保证 "最后一公里" 的接入网带 宽。 其中, P0N系统是目前应用最广泛的光纤到户技术之一。
P0N系统的组成及其在传统的网络架构中的位置示意图如图 1所示, P0N系统主要包括: OLT ( Optical Line Terminals , 光线路终端) 、 ONU ( Optical Network Unit , 光网络单元) 、 光分路器和 ODN ( Optical Distribution Network, 光分配网) 等部分。 OLT和光分路器之间由主干光纤 连接, 光分路器实现点对多点的光功率分配, 通过多个分支光纤连接到多个 0NU。 OLT和 ONU之间的主干光纤、 光分路器和分支光纤统称为 0DN。 从 0LT到 0NU的方向称为下行方向, 从 0NU到 0LT的方向称为上行方向。
在传统的 P0N系统中, 光分路器的分路比从 1 :16、 1 :32到 1 :64, 最大可 选为 1 :128 , 0LT通过光分路器对接的 0NU数量较少, 覆盖半径不超过 20km , 导致传统的网络架构中 OLT数量较多, 且位置区域偏远、 分散, 很不 方便管理和维护, 设备投资和维护成本较高。 P0N的拉远有利于简化接入 层、 汇聚层等网络层次, 减少网络节点数, 增加单个 OLT所带的用户数量, 最大程度地分摊成本, 最终实现降低设备投资、 节省管理和维护成本。
一种 LR-PON ( Long Reach PON , 长距离 PON ) 的基本架构如图 2所 示。 在光分路器和 0LT之间放置 RE ( Reach Extension , 拉远设备)设备, RE设备可以是电中继方式或者全光中继方式。 加入 RE设备后, 传统的 0DN 网络被分开为两个 0DN网络, 即 0DN1和 0DN2。 在全光中继方式中, 全光 RE设备完成光信号的放大等功能。
上述图 2所示的 LP-P0N基本架构中存在下述问题:
1、 引入了有源 RE设备, 整个 0DN网络的稳定性和可靠性不如以前的无 源光路节点;
2、 光纤传输路径由以前的 20km范围以内扩展到超过 100km范围, 引入 了长距离光纤路径的故障概率;
3、 覆盖范围扩大, OLT对接的用户数量是以前的几倍到几十倍, 故障导 致的业务影响面较广;
4、 RE设备的加入, 把光纤路径划分成两段或者更多段路径, 如果某段 路径出现故障, 需要尽快定位出故障原因和故障点, 以便尽快处理。
由于以上几个方面的原因, 需要在 LR-PON的应用中, 对光信号和 RE设 备本身做监测, 并产生相应的告警、 性能等信息, 实现例如保护、 故障定位 等功能。 因此, 需要建立 RE设备和 OLT设备之间的通信通道, 以支持对 RE ϋ々ΟΑΜ ( Operation , Administration and Maintenance, 才喿作、 管理和 维护)功能。
现有技术中的一种建立 RE设备和 0LT设备之间的通信通道的方案主要包 括: 将 RE设备和 0LT设备之间的 0AM信息放入上下行的 GTC ( GP0N Transmission Converge , GPON传输汇聚 ) 或者 GEM ( GPON Encapsulation Mode , GPON封装模式) 帧中, 为了不影响现有的客户业 务, 可以提高 RE设备和 0LT设备之间的线路速率, 用增加的线路速率来容纳 上述 OAM信息。 OLT和 RE设备做光电转换、 解帧 /组帧、 电光转换等操作, 从 GTC或者 GEM帧中取出上述 OAM信息。
在实现本发明过程中, 发明人发现上述现有技术中的一种建立 RE设备和 0LT设备之间的通信通道的方案中至少存在如下问题:
需要提高 RE设备和 OLT设备之间的线路速率, 更改现有 PON体制, 不能 兼容现有的 OLT设备。 RE设备和 OLT设备需要做光-电-光转换、 解帧 /组帧等 操作, 才能从 GTC或者 GEM帧中取出上述 OAM信息, 处理复杂, 成本高。
现有技术中的另一种建立 RE设备和 OLT设备之间的通信通道的方案主要 包括: 全光 RE设备和 OLT设备之间使用和 PON上下行方向波长不同的新增波 长建立通信通道, RE设备和 OLT设备之间的 OAM信息通过此新增波长建立的 通信通道传送。
在实现本发明过程中, 发明人发现上述现有技术中的另一种建立 RE设备 和 OLT设备之间的通信通道的方案中至少存在如下问题:
RE设备和 OLT设备需要处理上述新增波长, 实现复杂, 对现有的 RE设 备和 OLT设备改动较大, 提高了 RE和 OLT的设备成本。 发明内容 本发明的实施例提供了一种 PON中传输信息的方法、 装置和系统, 以实 现在不影响现有 PON体制、 不提高 PON的线路速率下, 在 RE设备和 OLT设 备之间传输 OAM信息。
一种拉远 RE设备, 包括: 下行光信号解调单元, 用于解调光线路终端 OLT设备发送的下行光信 号, 得到所述下行光信号中包含的 OLT设备发送给 RE设备的下行操作、 管理 和维护 OAM信息;
OAM信息处理单元, 用于接收所述下行光信号解调制单元发送的下行 OAM信息;
控制单元, 用于产生需要上报给 OLT设备的上行 OAM信息并发送给所述 OAM信息处理单元, 并接收所述 OAM信息处理单元发送的下行 OAM信息; 上行光信号调制单元, 用于根据所述 OAM信息处理单元发送的所述上行 OAM信息对 OLT设备发送的下行光信号进行调制处理, 将调制处理后包含所 述上行 OAM信息的光信号发送给 OLT设备。
一种 OLT设备, 包括:
RE回送光信号提取单元, 用于从 OLT设备接收的光信号中提取 RE设备 回送的光信号;
光信号解调制单元, 用于解调所述 RE回送光信号提取单元发送的光信 号, 得到所述光信号中的上行 OAM信息;
OAM信息处理单元, 用于接收所述光信号解调制单元发送的上行 OAM信 息;
控制单元, 用于产生需要发送给 RE设备的下行 OAM信息并发送给所述 OAM信息处理单元, 并接收所述 OAM信息处理单元发送的上行 OAM信息; 光信号调制单元, 用于根据所述 OAM信息处理单元发送的所述下行 OAM 信息对发送给 RE设备的下行光信号进行调制处理, 将调制处理后的包含所述 下行 OAM信息的光信号发送给 RE设备。 一种无缘光网络中的通信系统, 包括: 所述的 RE设备和所述的 OLT设 备,
所述的 RE设备, 根据需要上报给 OLT设备的上行 OAM信息对 OLT设备发 送的下行光信号进行调制处理, 将调制处理后的包含所述上行 OAM信息的光 信号发送给所述 OLT设备;
所述的 OLT设备, 根据需要下发给 RE设备的下行 OAM信息对 OLT设备发 送给 RE设备的下行光信号进行调制处理, 将调制处理后的包含所述下行
OAM信息的光信号发送给所述 RE设备。
一种拉远 RE设备向光线路终端 OLT设备传输 OAM信息的方法, 包括: 获取 RE设备需要上报给 OLT设备的上行 OAM信息, 根据所述上行 OAM 信息对 OLT设备发送的下行光信号进行调制处理, 将调制处理后的包含所述 上行 OAM信息的光信号发送给所述 OLT设备; 获取 OLT设备需要下发给 RE设备的下行 OAM信息, 根据所述下行 OAM 信息对 OLT设备发送给 RE设备的下行光信号进行调制处理, 将调制处理后的 包含所述下行 OAM信息的光信号发送给所述 RE设备。 由上述本发明的实施例提供的技术方案可以看出, 本发明实施例通过 RE 设备利用 OAM信息对 OLT设备发送的下行光信号进行调制处理, 将调制处理 后的光信号回送给所述 OLT设备; OLT设备利用 OAM信息对发送给 RE设备的 下行光信号进行调制处理。 可以在不影响现有 PON体制、 不提高 PON的线路 速率下, 实现在 RE设备和 OLT设备之间传输 OAM信息, 实现 OLT设备对全光 RE设备的管理控制功能。 附图说明 为了更清楚地说明本发明实施例的技术方案, 下面将对实施例描述中所 需要使用的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发 明的一些实施例, 对于本领域普通技术人员来讲, 在不付出创造性劳动性的 前提下, 还可以根据这些附图获得其他的附图。
图 1为现有技术中的一种 PON系统的组成及其在传统的网络架构中的位 置示意图;
图 2为现有技术中的一种 LR-PON的基本架构示意图;
图 3为本发明实施例一提供的一种在 RE设备和 OLT设备之间传输管理信 息的系统的结构示意图;
图 4为本发明实施例二提供的一种全光 RE设备的结构示意图;
图 5为本发明实施例三提供的一种 OLT设备的结构示意图。 具体实施方式 在本发明实施例中, 获取 RE设备需要上报给 OLT设备的上行 OAM信 息, 根据所述上行 OAM信息对 OLT设备发送的下行光信号进行调制处理, 将 调制处理后的包含所述上行 OAM信息的光信号发送给所述 OLT设备;
获取 OLT设备需要下发给 RE设备的下行 OAM信息, 根据所述下行 OAM 信息对 OLT设备发送给 RE设备的下行光信号进行调制处理, 将调制处理后的 包含所述下行 OAM信息的光信号发送给所述 RE设备。 为便于对本发明实施例的理解, 下面将结合附图以几个具体实施例为例 做进一步的解释说明, 且各个实施例并不构成对本发明实施例的限定。
实施例一
该实施例提供的在 RE设备和 OLT设备之间传输管理信息的系统的结构示 意图如图 3所示, 包括全光 RE设备和 OLT设备。
在全光 RE设备中增加了 OAM处理模块, 该 OAM处理模块分离出部分 OLT设备发送给全光 RE设备的下行方向的光信号, 对该光信号进行调制, 在 调制过程中可以在光信号中封装需要传送给 OLT的上行 OAM信息。 然后, 将 调制后的光信号回送给 OLT, 从而建立全光 RE设备到 OLT设备的通信通道。
在 OLT设备中也增加了 OAM处理模块, 该 OAM处理模块直接调制 OLT设 备发送给全光 RE设备的下行方向的连续的光信号, 在调制过程中可以在光信 号中封装需要传送给全光 RE设备的下行 OAM信息。 然后, 将调制后的光信 号发送给全光 RE设备, 从而建立 OLT设备到全光 RE设备的通信通道。 通过上述在全光 RE设备和 OLT设备中增加的 OAM处理模块, 在光层建 立了 OLT设备和全光 RE设备之间的双向的通信通道, 通过该通信通道可以在 OLT设备和全光 RE设备之间传输 OAM信息。
上述全光 R E设备和 0 LT设备中的 OAM处理模块对光信号的调制方法可 以是调频、 调幅、 幅度键控、 频移键控和相移键控等多种方式。
以调幅为例, 上述对光信号的调制过程主要包括:
上行光信号调制单元将 OAM信息转换成对应的电压信号。 例如二进制 "1 " 对应输出 VOA不对经过其中的光信号做任何衰减的控制电压值, 二进 制 "0" 对应输出 VOA对经过其中的光信号衰减 5%的控制电压值。 将上述电 压信号送到 VOA的控制端, 控制经过 VOA的光信号衰减量。 经过上述处理, OAM信息即被调制到光信号上。
调频的方法类似, 例如用 0.1 ms时长的 10KHz表示二进制 " 1 " , 用 0.1 ms时长的 20KHz表示二进制 "0" 。
当全光 RE设备级联使用时, 可以给每个全光 RE设备分配不同的设备标 识, OLT设备按照设备标识给特定的全光 RE设备发送信息; 同样, 全光 RE 设备发送给 OLT设备的信息中也携带本设备的设备标识。 在全光 RE设备向 OLT设备发送信息前, 需要检测下一级全光 RE设备是否正在发送信息, 如果 正在发送信息, 需要等到下一级全光 RE设备的信息发送完成后, 才能向 OLT 设备发送信息。 以避免光信号发生冲突。
在实际应用中, 还可以根据需要只建立全光 RE设备到 OLT设备的通信通 道或者 OLT设备到全光 RE设备的通信通道。
该实施例可以解决 PON系统中上行突发间隔时没有光信号而引起的无法 调制问题, 适当选择全光 RE设备和 OLT设备之间光信号的调制幅度, 保证不 影响到全光 RE设备和 OLT设备的光信号接收, 所以不会影响到现有 PON网 络。
以 GPON系统 Class A激光器参数为例, G.894中定义 Class A的平均发射 光功率在 OdBm到 4dBm之间, 实际 OLT设备的平均发射光功率约 2.5dBm , 消光比最小是 10dB。 本发明实施例中, 可以选择 5%的调制幅度, 发射端的 平均光功率最大降低 0.22dB , 大约和一个光纤连接器或者 500米长光纤的插 入损耗相当, 只要整个 PON系统的光功率预算有 0.22dB的冗余, 接收端就有 足够强的光信号, 事实上, 在本发明实施例中, 最少要求有 3dB以上的光功 率预算冗余, 所以在发射端做 5%的幅度调制, 不会对光信号接收造成影响。 在本发明实施中, 发射时的调制幅度控制在 1 % ~ 5%。
实施例二
该实施例提供的一种全光 RE设备的结构示意图如图 4所示, 包括: 下行 光信号分离器、 下行光信号解调、 OAM信息处理、 上行光信号调制、 控制单 元和光信号分配单元。 各个模块的主要功能包括:
下行光信号分离器单元, 用于将 OLT设备发送给全光 RE设备的下行方向 的光信号中分离成 3路, 分别送给下行光信号解调制单元、 上行光信号调制单 元和下行方向的光放大器。
下行光信号解调单元, 用于从下行光信号分离器单元传输过来的来自 OLT设备的下行光信号中取出包络线, 经过和 OLT设备的光信号调制对应的 将该下行 OAM信息传输给 OAM信息处理单元。
OAM信息处理单元, 用于对下行光信号解调单元传输过来的 OLT设备对 全光 RE设备的下行 OAM信息进行适配处理, 该适配处理主要包括: 根据全 光 RE设备的控制单元的信息格式要求对上述下行 OAM信息进行必要的格式 转换。 然后, 将适配处理后的下行 OAM信息送给全光 RE设备的控制单元; 从全光 RE设备的控制单元收集需要上报给 OLT设备的上行 OAM信息, 对该上行 OAM信息进行适配处理, 将适配处理后的上行 OAM信息发送给全光 RE设备的上行光信号调制单元。
在全光 RE设备级联使用时, 判断下一级全光 RE设备是否正在发送信 息, 如果是, 则等到所述下一级全光 RE设备发送信息完毕后, 再将适配处理 后的 0AM信息发送给全光 RE设备的上行光信号调制单元。 以避免光信号冲 上行光信号调制单元, 用于将 OAM信息处理单元传输过来的需要发送到 OLT设备的上行 OAM信息进行封装、 转换等调制处理, 将调制处理后的光信 号传输给光信号分配单元。 包括: OAM信息封装模块、 OAM信息调制模块和 光可变衰减器(VOA, Variable Optical Attenuator ) 。
上述上行光信号调制单元中的 OAM信息封装模块, 用于对接收到的上行 0AM信息进行封装, 将封装后的上行 0AM信息传输给 0AM信息调制模块; 上述上行光信号调制单元中的 0AM信息调制模块, 用于对所述 0AM信息 封装模块传输过来的上行 0AM信息进行调制, 将所述上行 0AM信息转换成 V0A的控制信号, 并将该控制信号传输给 V0A;
上述上行光信号调制单元中的 V0A, 用于根据所述 0AM信息调制模块传 输过来的控制信号, 改变通过 V0A的 0LT设备发送的下行光信号的强度, 将 改变了强度的下行光信号输出。
控制单元, 用于产生需要上报给 0LT设备的上行 0AM信息并发送给所述 0AM信息处理单元, 并接收所述 0AM信息处理单元发送的下行 0AM信息;
光信号分配单元, 用于将上行光信号调制单元传输过来的经过调制后的 光信号通过耦合器回送给 0LT设备, 回送路径和全光 RE设备内部的 Diplexer (双工器)设计有关, 上述全光 RE设备内部的 Diplexer可以为波长滤波器或 环型器。
在实际应用中, 上述 OAM信息处理单元可以集成在全光 RE设备的控制 单元内部, 也可以独立于控制单元而单独设置。 实施例三
该实施例提供的一种 OLT设备的结构示意图如图 5所示, 包括如下模块: RE回送光信号提取、 光信号解调制、 OAM信息处理单元、 光信号解调单元 和控制单元。
RE回送光信号提取单元, 用于从 OLT接收的光信号中提取 RE设备回送 的光信号, 将该光信号传输给光信号解调制单元。
光信号解调制单元, 用于从 RE回送光信号提取单元传输过来的光信号中 提取出调制信号, 对该调制信号经过和全光 RE设备调制对应的解调制过程, 得到调制信号中的全光 RE设备上报的上行 OAM信息, 将该上行 OAM信息传 输给 OAM信息处理单元。 在实际应用中, 来自全光 RE设备的光信号中可能 有较大的幅度跳变, 需要在设计时特别处理, 例如做滤波、 做 FFT ( Fast Fourier Transform: 快速傅里叶变换) 变换等。
OAM信息处理单元, 用于对所述光信号解调制单元传输过来的上行 OAM 信息进行适配处理后, 发送给 OLT设备的控制单元, 该适配处理主要包括: 根据 OLT设备的控制单元的信息格式要求对上述上行 OAM信息进行必要的格 式转换。 从 OLT设备的控制单元收集需要发送给 RE设备的下行 OAM信息, 对 该下行 OAM信息进行适配处理后, 发送给光信号调制单元;
光信号调制单元, 用于将 OAM信息处理单元传输过来的需要发送到 RE 的下行 OAM信息进行封装、 转换等调制处理, 形成 VOA的控制信号, 利用所 述控制信号改变通过 VOA的 OLT设备发送的下行光信号的强度, 从而实现将 上述下行 OAM信息下发给全光 RE设备。 包括: OAM信息封装模块、 OAM信 息调制模块和 VOA。 上述光信号调制单元中的 OAM信息封装模块, 用于对接收到的下行 OAM 信息进行封装, 将封装后的下行 OAM信息传输给 OAM信息调制模块;
上述光信号调制单元中的 OAM信息调制模块, 用于对所述 OAM信息封装 模块传输过来的下行 OAM信息进行调制, 将所述下行 OAM信息转换成 VOA 的控制信号, 并将该控制信号传输给 VOA;
上述光信号调制单元中的 VOA, 用于根据所述 OAM信息调制模块传输过 来的控制信号, 改变通过 VOA的 OLT设备发送的下行光信号的强度, 将改变 了强度的下行光信号输出。
控制单元, 用于产生需要发送给 RE设备的下行 OAM信息并发送给所述 OAM信息处理单元, 并接收所述 OAM信息处理单元发送的上行 OAM信息; 在实际应用中, 上述 0 L T设备中的光信号调制单元发出的光调制信号也 可能被 OLT设备中的光信号解调制单元接收到, 所以, OLT设备和全光 RE设 备的光调制方式需要有差异。 例如使用频率调制时, OLT设备和全光 RE设备 使用不同的频点, OLT设备的光信号解调制单元釆用带通滤波器过滤 OLT设 备自己发出的调制信号。
上述 OLT设备中内部的 Diplexer可以为耦合器、 波长滤波器或环型器。 在实际应用中, 上述 OAM信息处理单元可以集成在 OLT设备的控制单元 内部, 也可以独立于控制单元而单独设置。
实施例四 该实施例提供的一种 RE设备向 0 LT设备传送上行 OAM信息的方法的处 理流程包括如下步骤:
步骤 s1、 全光 RE设备产生需要传送给 OLT设备的上行 OAM信息, 对上 述上行 OAM信息进行适配处理。 上述适配处理主要包括: 根据全光 RE设备的上行光信号调制单元的信息 格式要求对上述 OAM信息进行必要的格式转换。 当全光 RE设备级联使用时, 还需要判断是否有其它全光 RE设备正在发 送数据, 如果有, 等待其它全光 RE设备的数据发送完成后, 再处理上述上行 OAM信息。 步骤 s2、 对上述适配处理后的上行 OAM信息进行封装, 以适应具体的物 理传输通道。 例如对上述上行 OAM信息做 PPP ( Point-to-Point Protocol, 点 到点协议) 、 HDLC ( High level Data Link Control, 高级数据链路控制) 、 LAPS ( Link Access Procedure-SDH , SDH的链路接入规程) 、 GFP ( Generic Framing Procedure, 通用成帧程序) 、 GMP ( Generic Mapping Procedure , 通用映射规程) 或者自定义等格式的封装, 以确定上述上行 0AM信息的开始 /结束位置和适配通道速率。 再将封装后的上述 0AM信息, 根据设定的调制方式, 转换成 V0A的控制 信号, 并将该控制信号传输给 V0A。 全光 RE设备还从 PON系统的连续下行光信号中分离出部分光信号, 将该 部分光信号传输到上述 V0A。 V0A根据接收到的控制信号, 改变通过 V0A的 所述部分光信号的强度, 实现将上述 0AM信息叠加到所述部分光信号, 完成 对所述部分光信号进行调制的过程。 然后, 通过耦合器将上述 V0A调制了强度的光信号耦合到上行方向, 发 送到 0LT设备。 步骤 S3、 0LT设备从接收到的光信号中得到上述全光 RE设备送来的经过 调制了强度的光信号。
步骤 s4、 对上述光信号做信号放大、 带通滤波和去除干扰信号处理, 然 后经过和全光 RE设备相反的 0AM信息解调制和 0AM信息解封装, 得到全光 RE设备送来的上行 OAM信息。 从而完成一次全光 RE设备到 OLT设备的上行 0AM信息的上传过程。 在该实施例中, 因为从 ONU到 OLT设备的是突发光信号, 全光 RE设备的 VOA不能使用 ONU发出的光信号。 于是, 用全光 RE设备从 PON系统的连续 下行光信号中分离出部分光信号, 送到全光 RE设备的 VOA做幅度调制, 保证 了全光 RE设备中的 VOA的输入光信号连续, 可以利用该 VOA向 OLT设备连续 地发送 OAM信息。 实施例五 该实施例提供的一种 OLT设备向全光 RE设备传送下行 OAM信息的方法 的处理流程包括如下步骤: 步骤 p1、 OLT设备产生需要传送给全光 RE设备的下行 OAM信息, 对该 下行 OAM信息进行适配处理。 上述适配处理主要包括: 根据 OLT设备的光信 号调制单元的信息格式要求对上述下行 OAM信息进行必要的格式转换。 步骤 p2、 对上述适配处理后的下行 OAM信息进行封装, 以适应具体的物 理传输通道。 例如对上述下行 OAM信息做 PPP、 HDLC、 LAPS , GFP、 GMP或者自定义等格式的封装, 以确定上述下行 OAM信息的开始 /结束位置 矛 o 西己 。 再将封装后的上述下行 ΟΑΜ信息, 根据设定的调制方式, 转换成 VOA的 控制信号, 并将该控制信号传输给 VOA。 VOA根据接收到的控制信号, 改变 通过 VOA的 OLT设备发送的下行光信号的强度, 实现将上述下行 OAM信息叠 加到下行光信号上, 完成对下行光信号进行调制的过程。 然后, 将调制后的 上述下行光信号发送给全光 RE设备。 从而实现将上述下行 OAM信息下发给 全光 RE设备。 步骤 p3、 全光 RE设备接收到来自 OLT设备经过调制的光信号后, 对该光 信号经过和 OLT设备相反的 OAM信息解调制和 OAM信息解封装, 得到 OLT设 备送来的下行 OAM信息。 从而完成一次 OLT设备到全光 RE设备的下行 OAM 信息的下发过程。 本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流 程, 是可以通过计算机程序来指令相关的硬件来完成, 所述的程序可存储于 一计算机可读取存储介质中, 该程序在执行时, 可包括如上述各方法的实施 例的流程。 其中, 所述的存储介质可为磁碟、 光盘、 只读存储记忆体 ( Read-Only Memory , ROM ) 或随机存储记忆体 ( Random Access Memory, RAM )等。
综上所述, 本发明实施例在不影响现有 PON体制、 不提高 PON的线路速 率下, 实现在 RE设备和 OLT设备之间传输 OAM信息, 实现 OLT设备对全光 RE设备的管理控制功能。
发送 OAM信息, 可以扩展和提高全光 RE设备的功能和性能, 例如更好的支 持 PON保护、 提高 PON系统的保护倒换速度和成功率, 本发明实施例不影响现有 PON体制, 能够向下兼容现有的 PON设备, 保 护用户投资, 并提供未来升级的可能性; 可以降低 LR-PON系统的维护使用 成本。 本发明实施例还适用于对其它类型的光突发中继设备做 OAM , 例如 WDM ( wavelength division multiplex , 波分复用) -PON的突发全光中继 器。
以上所述, 仅为本发明较佳的具体实施方式, 但本发明的保护范围并不 局限于此, 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可 轻易想到的变化或替换, 都应涵盖在本发明的保护范围之内。 因此, 本发明 的保护范围应该以权利要求的保护范围为准。

Claims

权 利 要 求
1、 一种拉远 RE设备, 其特征在于, 包括: 下行光信号解调单元, 用于解调光线路终端 OLT设备发送的下行光信 号, 得到所述下行光信号中包含的 OLT设备发送给 RE设备的下行操作、 管理 和维护 OAM信息;
OAM信息处理单元, 用于接收所述下行光信号解调制单元发送的下行 OAM信息; 控制单元, 用于产生需要上报给 OLT设备的上行 OAM信息并发送给所述 OAM信息处理单元, 并接收所述 OAM信息处理单元发送的下行 OAM信息; 上行光信号调制单元, 用于根据所述 OAM信息处理单元发送的所述上行 OAM信息对 OLT设备发送的下行光信号进行调制处理, 将调制处理后包含所 述上行 OAM信息的光信号发送给 OLT设备。
2、 根据权利要求 1所述的 RE设备, 其特征在于, 所述的 RE设备还包 括: 下行光信号分离器单元, 用于将所述 OLT设备发送的下行方向的光信号 中分离成 3路, 分别发送给所述下行光信号解调制单元、 上行光信号调制单元 和 RE设备中的下行方向的光放大器。
3、 根据权利要求 1所述的 RE设备, 其特征在于: 当所述 RE设备级联使用时, 所述 OAM信息处理单元, 还用于判断是否 有下级的 RE设备正在发送数据, 如果有, 则等待所述下级 RE设备的数据发 送完成后, 再将所述 OAM信息传输给所述上行光信号调制单元。
4、 根据权利要求 1或 2或 3所述的 RE设备, 其特征在于, 所述的上行光 信号调制单元包括:
OAM信息封装模块, 用于对接收到的上行 OAM信息进行封装, 将封装后 的上行 OAM信息传输给 OAM信息调制模块;
OAM信息调制模块, 用于对所述 OAM信息封装模块传输过来的上行 OAM信息进行调制, 将所述上行 OAM信息转换成光可变衰减器的控制信号, 并将该控制信号传输给光可变衰减器;
光可变衰减器, 用于根据所述 OAM信息调制模块传输过来的控制信号, 改变通过光可变衰减器的 OLT设备发送的下行光信号的强度, 将改变了强度 的下行光信号输出。
5、 一种 OLT设备, 其特征在于, 包括:
RE回送光信号提取单元, 用于从 OLT设备接收的光信号中提取 RE设备 回送的光信号;
光信号解调制单元, 用于解调所述 RE回送光信号提取单元发送的光信 号, 得到所述光信号中的上行 OAM信息;
OAM信息处理单元, 用于接收所述光信号解调制单元发送的上行 OAM信 息;
控制单元, 用于产生需要发送给 RE设备的下行 OAM信息并发送给所述 OAM信息处理单元, 并接收所述 OAM信息处理单元发送的上行 OAM信息; 光信号调制单元, 用于根据所述 OAM信息处理单元发送的所述下行 OAM 信息对发送给 RE设备的下行光信号进行调制处理, 将调制处理后的包含所述 下行 OAM信息的光信号发送给 RE设备。
6、 根据权利要求 5所述的 OLT设备, 其特征在于, 所述的光信号调制单 元包括:
OAM信息封装模块, 用于对接收到的下行 OAM信息进行封装, 将封装后 的下行 OAM信息传输给 OAM信息调制模块;
OAM信息调制模块, 用于对所述 OAM信息封装模块传输过来的下行 OAM信息进行调制, 将所述下行 OAM信息转换成光可变衰减器的控制信号, 并将该控制信号传输给光可变衰减器;
光可变衰减器, 用于根据所述 OAM信息调制模块传输过来的控制信号, 改变通过光可变衰减器的 OLT设备发送给 RE设备的下行光信号的强度, 将改 变了强度的下行光信号输出。
7、 一种无缘光网络中的通信系统, 其特征在于, 包括: 如权利要求 1至 4任一项所述的 RE设备和权利要求 5至 6任一项所述的 OLT设备,
所述的 RE设备, 根据需要上报给 OLT设备的上行 OAM信息对 OLT设备发 送的下行光信号进行调制处理, 将调制处理后的包含所述上行 OAM信息的光 信号发送给所述 OLT设备;
所述的 OLT设备, 根据需要下发给 RE设备的下行 OAM信息对 OLT设备发 送给 RE设备的下行光信号进行调制处理, 将调制处理后的包含所述下行 OAM信息的光信号发送给所述 RE设备。
8、 一种拉远 RE设备向光线路终端 OLT设备传输 OAM信息的方法, 其特 征在于, 包括:
获取 RE设备需要上报给 OLT设备的上行 OAM信息, 根据所述上行 OAM 信息对 OLT设备发送的下行光信号进行调制处理, 将调制处理后的包含所述 上行 OAM信息的光信号发送给所述 OLT设备;
获取 OLT设备需要下发给 RE设备的下行 OAM信息, 根据所述下行 OAM 信息对 OLT设备发送给 RE设备的下行光信号进行调制处理, 将调制处理后的 包含所述下行 OAM信息的光信号发送给所述 RE设备。
9、 根据权利要求 8所述的方法, 其特征在于, 所述的根据所述上行 OAM 信息对 OLT设备发送的下行光信号进行调制处理, 将调制处理后的包含所述 上行 OAM信息的光信号发送给所述 OLT设备, 包括: 对所述上行 OAM信息进行封装和调制处理, 将所述上行 OAM信息转换成 光可变衰减器的控制信号;
从 OLT设备发送的下行光信号中分离出部分光信号, 根据所述控制信号 改变通过光可变衰减器的所述部分光信号的强度, 将改变了强度的所述部分 光信号回送给所述 OLT设备。
10、 根据权利要求 8所述的方法, 其特征在于, 所述的方法还包括: 当所述 RE设备级联使用时, 当有下级的 RE设备正在向所述 OLT设备发 送数据时, 则等待所述下级 RE设备的数据发送完成后, 再将所述调制处理后 的包含所述上行 OAM信息的光信号发送给所述 OLT设备。
1 1、 根据权利要求 8或 9或 10所述的方法, 其特征在于, 所述的方法还包 括:
对 OLT设备发送的下行光信号经过和 OLT设备的光信号调制对应的解调 制过程, 得到所述下行光信号中包含的 OLT设备发送给 RE设备的下行 OAM信 息;
对所述下行 OAM信息进行适配处理后, 发送给 RE设备的控制单元。
12、 根据权利要求 8所述的方法, 其特征在于, 所述的根据所述下行 OAM信息对 OLT设备发送给 RE设备的下行光信号进行调制处理, 将调制处理 后的包含所述下行 OAM信息的光信号发送给所述 RE设备, 包括:
对所述下行 OAM信息进行封装和调制处理, 将所述下行 OAM信息转换成 光可变衰减器的控制信号;
根据所述控制信号改变通过光可变衰减器的所述 OLT设备发送给 RE设备 的下行光信号的强度, 将改变了强度的所述下行光信号发送给所述 RE设备。
13、 根据权利要求 8或 12所述的方法, 其特征在于, 所述的方法还包 括: 从 OLT设备接收的光信号中提取 RE设备发送的光信号, 对该光信号经过 和 RE设备调制对应的解调制过程, 得到所述光信号中的上行 OAM信息; 对所述上行 OAM信息进行适配处理后, 发送给 OLT设备的控制单元。
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