WO2013189321A1 - 一种无源光网络中的波长调谐方法、系统及设备 - Google Patents

一种无源光网络中的波长调谐方法、系统及设备 Download PDF

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Publication number
WO2013189321A1
WO2013189321A1 PCT/CN2013/080853 CN2013080853W WO2013189321A1 WO 2013189321 A1 WO2013189321 A1 WO 2013189321A1 CN 2013080853 W CN2013080853 W CN 2013080853W WO 2013189321 A1 WO2013189321 A1 WO 2013189321A1
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WO
WIPO (PCT)
Prior art keywords
onu
wavelength
olt
tuning
state
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PCT/CN2013/080853
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English (en)
French (fr)
Inventor
耿丹
张伟良
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中兴通讯股份有限公司
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Publication of WO2013189321A1 publication Critical patent/WO2013189321A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
    • H04J14/0246—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
    • H04J14/0247—Sharing one wavelength for at least a group of ONUs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
    • H04J14/025—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
    • H04J14/0252—Sharing one wavelength for at least a group of ONUs, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0256—Optical medium access at the optical channel layer
    • H04J14/0257—Wavelength assignment algorithms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0256—Optical medium access at the optical channel layer
    • H04J14/0258—Wavelength identification or labelling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0267—Optical signaling or routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/1301—Optical transmission, optical switches
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
    • H04Q2213/13295—Wavelength multiplexing, WDM

Definitions

  • Wavelength tuning method Wavelength tuning method, system and device in passive optical network
  • the present invention relates to the field of communications technologies, and in particular, to a wavelength tuning method, system, and device in a passive optical network. Background technique
  • the topology of the PON system is shown in Figure 1.
  • the PON system usually consists of an optical line terminal (OLT) on the central office, an optical network unit (ONU) on the user side, and an optical distribution network (ODN), usually point-to-multipoint.
  • ODN optical distribution network
  • ODN usually point-to-multipoint.
  • ODN consists of single-mode fiber and passive optical components such as optical splitters and optical connectors, providing optical transmission media for the physical connection between the OLT and the ONU.
  • PON technology mainly includes time division multiplexing (TDM), PON systems, wavelength division multiplexing (WDM), PON systems, and Orthogonal Frequency Division Multiplexing (OFDM) systems.
  • TDM time division multiplexing
  • WDM wavelength division multiplexing
  • OFDM Orthogonal Frequency Division Multiplexing
  • the hybrid PON system includes a wavelength division time division hybrid PON system, a frequency division time division hybrid PON system, and the like, and a wavelength division time
  • the light wavelengths of the respective light emitters are respectively ⁇ (11, ⁇ 2, ..., ⁇ , where ⁇ (11 is the OLT communicates with the first ONU)
  • the wavelength used to transmit the downlink data ⁇ d 2 is the wavelength used to transmit the downlink data when the OLT communicates with the second ONU, ..., ⁇ (1 ⁇ is the transmitting wavelength of the transmitting transmitter when the OLT communicates with the nth ONU, for example
  • the first ONU is used to send uplink data transmission to the OLT.
  • the transmitting wavelength of the transmitter is ⁇ ⁇
  • the transmitting wavelength of the transmitter used by the second ONU to send uplink data to the OLT is ⁇ u2, ...
  • the transmitting wavelength of the transmitter used by the nth ONU to send uplink data to the OLT For ⁇ un, the OLT can send downlink data to all ONUs at the same time. Each ONU can also send uplink data at the same time. That is, the OLT and the ONU adopt a point-to-point structure on the optical channel.
  • each subcarrier there are multiple different subcarriers at the OLT, each of which is C l, C 2, ..., C n , and each subcarrier is orthogonal, and the OLT will send to the first ONU.
  • the downlink data is modulated onto the first subcarrier (or modulated onto the first subcarrier and other subcarriers), and the OLT modulates the downlink data sent to the second ONU to the second subcarrier (or modulated to the On the two subcarriers and other subcarriers, ..., the OLT modulates the downlink data sent to the nth ONU to the nth subcarrier (or to the nth subcarrier and other subcarriers), and sends it to different ONUs.
  • the subcarriers used in the downlink data there is no intersection between the subcarriers used in the downlink data, that is, different ONUs use different subcarriers, and the subcarriers used by the ONU to send uplink data to the OLT are the same as the subcarriers that the OLT uses to send downlink data to the current ONU.
  • the OLT can send downlink data to all ONUs at the same time.
  • Each ONU can also send uplink data at the same time. That is, the OLT and the ONU adopt a point-to-point structure on the optical channel.
  • each OLT manages a group of ONUs, and the group of ONUs in the wavelength division time division hybrid PON system is used for transmitting uplinks.
  • the uplink wavelengths of the data are the same, and the downlink wavelengths of the downlink data are also the same.
  • the subcarriers or the subcarrier groups used by the group of ONUs in the frequency division time division hybrid PON system to transmit uplink data are the same, and the subcarriers of the downlink data are received.
  • the subcarrier group is the same, and different ONUs in the group of ONUs transmit uplink data by means of time division multiplexing.
  • the downlink wavelengths (subcarriers or subcarrier groups) of different OLTs are different, and the uplink wavelengths (subcarriers or subcarrier groups) used by each group of ONUs managed by different OLTs are also different.
  • the system can be a Gigabit-Capable Passive Optical Network (GPON) system, an Ethernet Passive Optical Network (EPON) system, and a 10G-capable passive optical network (XG-PON, 10).
  • GPON Gigabit-Capable Passive Optical Network
  • EPON Ethernet Passive Optical Network
  • XG-PON 10G-capable passive optical network
  • -Gigabit-capable passive optical network system and 10-Gigabit-capable EPON system taking into account the wavelength assignment of the ONU, load balancing, energy saving, abnormal positioning ONU and protection switching The OLT needs to tune the wavelength of the ONU.
  • the OLT may generate the LOS alarm of the ONU and affect the service of the ONU.
  • the OLT may generate the LOS alarm of the ONU and affect the service of the ONU.
  • the ONU cannot receive the downlink frame.
  • the LOS alarm may be generated on the side, which also affects the services of the ONU.
  • the main purpose of the embodiments of the present invention is to provide a wavelength tuning method, system, and device in a passive optical network, which solves the problem that the ONU cannot respond to the bandwidth or wavelength allocation allocated by the OLT during the ONU wavelength tuning process. An alarm occurred on the side and ONU side.
  • a wavelength tuning method in a passive optical network comprising:
  • the ONU reports at least one of the ONU current use wavelength, the ONU wavelength tuning range, and the time required for the wavelength tuning of the ONU to the optical line terminal OLT;
  • the OLT allocates a wavelength to the ONU according to the information reported by the ONU.
  • the method further includes: the OLT allocates the ONU for the ONU, before reporting, to the OLT, the at least one of the ONU, the ONU wavelength tuning range, and the ONU wavelength tuning time.
  • the OLT allocates the ONU for the ONU, before reporting, to the OLT, the at least one of the ONU, the ONU wavelength tuning range, and the ONU wavelength tuning time.
  • the ONU Responding to the OLT the replied information includes at least two of the ONU's serial number information, the ONU currently used wavelength, the ONU wavelength tuning range, and the time required for the ONU's wavelength tuning.
  • the method further includes: the OLT allocates the ONU for the ONU, before reporting, to the OLT, the at least one of the ONU, the ONU wavelength tuning range, and the ONU wavelength tuning time.
  • the OLT allocates the ONU for the ONU, before reporting, to the OLT, the at least one of the ONU, the ONU wavelength tuning range, and the ONU wavelength tuning time.
  • the ONU returns information to the OLT;
  • the reply information includes at least two types of information such as registration information of the ONU, current wavelength of the ONU, ONU wavelength tuning range, and time required for wavelength tuning of the ONU.
  • the method further includes: the OLT interrogating the wavelength tuning of the ONU, before the ONU reports the at least one of the ONU current use wavelength, the ONU wavelength tuning range, and the ONU wavelength tuning time to the OLT. Capability, the ONU returns information to the OLT; the replied information includes at least one of an ONU current use wavelength, an ONU wavelength tuning range, and a time required for wavelength tuning of the ONU.
  • the method further includes: after receiving the command for allocating wavelengths sent by the OLT, the ONU implements state machine migration by using any of the following methods:
  • Manner 1 The ONU is in the state Ox before the tuning wavelength.
  • the ONU starts to receive the wavelength command and the ONU tunes the wavelength.
  • the ONU completes the wavelength tuning and regains the downlink frame synchronization.
  • the ONU remains in the Ox state.
  • Manner 2 The ONU is in the state Ox before the tuning wavelength, and the ONU tunes the wavelength, and shifts to the intermittent downlink synchronization loss state. When the ONU completes the wavelength tuning and regains the downlink synchronization, the ONU shifts back to the state Ox, or the ONU shifts back to the ranging state;
  • Mode 3 The ONU is in the state before the tuning wavelength. Ox, the ONU tunes the wavelength, and shifts to the wavelength tuning state. When the ONU completes the wavelength tuning and regains the downlink synchronization, the ONU shifts back to the state Ox, or the ONU shifts back to the ranging state.
  • a wavelength tuning system in a passive optical network comprising: an optical network unit ONU and Optical line terminal OLT; wherein
  • the ONU is configured to report to the OLT at least one of the ONU wavelength tuning phase, the ONU current use wavelength, the ONU wavelength tuning range, and the ONU wavelength tuning time;
  • the OLT is configured to allocate a wavelength to the ONU according to the information reported by the ONU.
  • the ONU is further configured to: when the OLT allocates a bandwidth for reporting the serial number information to the ONU, replying includes the serial number information of the ONU, the current use wavelength of the ONU, the ONU wavelength tuning range, and the time required for the wavelength tuning of the ONU. At least two kinds of information are given to the OLT.
  • the ONU is further configured to: when the OLT allocates a bandwidth for reporting the registration information to the ONU, the reply includes the registration information of the ONU, the current use wavelength of the ONU, the ONU wavelength tuning range, and the time required for the wavelength tuning of the ONU. At least two kinds of information are given to the OLT.
  • the ONU is further configured to: when the OLT queries the wavelength tuning capability of the ONU, return at least one of the information including the ONU current use wavelength, the ONU wavelength tuning range, and the ONU wavelength tuning time to the OLT. .
  • the ONU is further configured to implement state machine migration by using any one of the following methods after receiving the command for allocating wavelengths sent by the OLT:
  • Manner 1 The ONU is in the state Ox before the tuning wavelength.
  • the ONU starts to receive the wavelength command and the ONU tunes the wavelength.
  • the ONU completes the wavelength tuning and regains the downlink frame synchronization.
  • the ONU remains in the Ox state.
  • Manner 2 The ONU is in the state Ox before the tuning wavelength, and the ONU tunes the wavelength, and shifts to the intermittent downlink synchronization loss state. When the ONU completes the wavelength tuning and regains the downlink synchronization, the ONU shifts back to the state Ox, or the ONU shifts back to the ranging state;
  • Mode 3 The ONU is in the state Ox before the tuning wavelength, and the ONU is tuned to the wavelength tuning state. When the ONU completes the wavelength tuning and regains the downlink synchronization, the ONU transitions back. State Ox, or ONU is transferred back to the ranging state.
  • a wavelength tuning device in a passive optical network the device is located in an optical network unit ONU; the device is configured to adjust the ONU wavelength, ONU wavelength tuning range, and ONU wavelength tuning time in the ONU wavelength tuning phase At least one type of information is reported to the OLT.
  • the device is further configured to: when the OLT allocates a bandwidth for reporting the serial number information to the ONU, replying includes the serial number information of the ONU, the current use wavelength of the ONU, the ONU wavelength tuning range, and the time required for the wavelength tuning of the ONU. At least two kinds of information are given to the OLT.
  • the device is further configured to: when the OLT allocates a bandwidth for reporting the registration information to the ONU, the reply includes the registration information of the ONU, the current use wavelength of the ONU, the ONU wavelength tuning range, and the time required for the wavelength tuning of the ONU. At least two kinds of information are given to the OLT.
  • the device is further configured to: when the OLT queries the wavelength tuning capability of the ONU, return at least one of the information including the ONU current use wavelength, the ONU wavelength tuning range, and the ONU wavelength tuning time to the OLT. .
  • the device is further configured to: after receiving the command for allocating wavelengths sent by the OLT, implement state machine migration by using any of the following methods:
  • Manner 1 The ONU is in the state Ox before the tuning wavelength.
  • the ONU starts to receive the wavelength command and the ONU tunes the wavelength.
  • the ONU completes the wavelength tuning and regains the downlink frame synchronization.
  • the ONU remains in the Ox state.
  • Manner 2 The ONU is in the state Ox before the tuning wavelength, and the ONU tunes the wavelength, and shifts to the intermittent downlink synchronization loss state. When the ONU completes the wavelength tuning and regains the downlink synchronization, the ONU shifts back to the state Ox, or the ONU shifts back to the ranging state;
  • Mode 3 The ONU is in the state Ox before the tuning wavelength, and the ONU is tuned to the wavelength tuning state. When the ONU completes the wavelength tuning and regains the downlink synchronization, the ONU transitions back to the state Ox, or the ONU transitions back to the ranging state.
  • the ONU wavelength tuning phase the ONU reports at least one of the ONU current use wavelength, the ONU wavelength tuning range, and the ONU wavelength tuning time to the OLT.
  • the OLT reports the information reported by the ONU according to the ONU.
  • the ONU assigns a wavelength.
  • the ONU reports at least one of the current usage wavelength of the ONU, the ONU wavelength tuning range, and the time required for the wavelength tuning of the ONU to the OLT, because the OLT receives the required information.
  • the information can allocate a wavelength to the ONU according to the information reported by the ONU, and the ONU can respond to the bandwidth allocation allocated by the OLT. Therefore, the OLT side and the ONU caused by the ONU cannot respond to the bandwidth allocation allocated by the OLT during the ONU wavelength tuning process are solved. The problem of an alarm on the side.
  • Figure 1 is a topological structural diagram of an existing GPON system
  • FIG. 3 is another topology diagram of a conventional hybrid PON system
  • FIG. 4 is a schematic diagram of an implementation process of a method principle according to an embodiment of the present invention. detailed description
  • the ONU reports at least one of the ONU wavelength tuning period, the ONU wavelength tuning range, and the ONU wavelength tuning time to the OLT; the OLT reports the information according to the ONU. Assign a wavelength to the ONU.
  • a wavelength tuning method in a passive optical network comprising:
  • the ONU reports the following information to the OLT:
  • the information includes at least one of an ONU currently used wavelength, an ONU wavelength tuning range, and a time required for wavelength tuning of the ONU, or is referred to as an ONU current use wavelength, ONU One or more of the wavelength tuning range, the time required for wavelength tuning of the ONU;
  • the OLT allocates a wavelength to the ONU according to the information reported by the ONU.
  • the OLT when the OLT allocates a bandwidth for reporting the serial number information to the ONU, the ONU replies to the OLT with at least two types of information: ONU serial number information, ONU current use wavelength, ONU wavelength tuning range, and ONU wavelength. The time required for tuning.
  • the ONU replies to the OLT with at least two types of information: ONU registration information, ONU current use wavelength, ONU wavelength tuning range, and wavelength tuning of the ONU. time.
  • the ONU replies to the OLT with at least one of the following information or one or more types of information:
  • the ONU currently uses the wavelength, the ONU wavelength tuning range, and the time required for the ONU's wavelength tuning.
  • the OLT assigns a command for wavelength tuning to the ONU, and the ONU replies to the OLT with at least one of the following information or one or more types of information:
  • the ONU currently uses the wavelength, the ONU wavelength tuning range, and/or the time required for the ONU's wavelength tuning.
  • the OLT commands the ONU to tune the wavelength, and allocates a wavelength to the ONU after the time required for the wavelength tuning of the ONU arrives.
  • the ONU After receiving the command of allocating wavelengths sent by the OLT, the ONU implements state machine migration by using any one of the following three methods:
  • Manner 1 The ONU is in the state Ox before the tuning wavelength.
  • the ONU starts to receive the wavelength command and the ONU tunes the wavelength.
  • the ONU completes the wavelength tuning and regains the downlink frame synchronization.
  • the ONU remains in the Ox state.
  • Method 2 The ONU is in the state Ox before the tuning wavelength, the ONU is tuned to the wavelength, and is transferred to the interval. When the ONU completes the wavelength tuning and regains the downlink synchronization, the ONU transitions back to the state Ox, or the ONU transitions back to the ranging state;
  • Mode 3 The ONU is in the state before the tuning wavelength. Ox, the ONU tunes the wavelength, and shifts to the wavelength tuning state. When the ONU completes the wavelength tuning and regains the downlink synchronization, the ONU shifts back to the state Ox, or the ONU shifts back to the ranging state.
  • a wavelength tuning system in a passive optical network comprising: an ONU and an OLT; wherein the ONU is configured to be in the ONU wavelength tuning phase, and the ONU currently uses the wavelength, the ONU wavelength tuning range, and the time required for the ONU wavelength to be tuned At least one type of information is reported to the OLT.
  • the OLT is configured to allocate a wavelength to the ONU according to the information reported by the ONU.
  • the ONU is configured to: when the OLT allocates a bandwidth for reporting the sequence number information to the ONU, replying to at least the sequence number information of the ONU, the current use wavelength of the ONU, the ONU wavelength tuning range, and the time required for the wavelength tuning of the ONU Two kinds of information are given to the OLT.
  • the ONU is configured to restore at least two of the ONU registration information, the ONU current use wavelength, the ONU wavelength tuning range, and the ONU wavelength tuning time when the OLT allocates a bandwidth for reporting the registration information to the ONU.
  • Information is given to the OLT.
  • the ONU is configured to, when the OLT interrogates the wavelength tuning capability of the ONU, to reply to the OLT at least one of the ONU current use wavelength, the ONU wavelength tuning range, and the time required for wavelength tuning of the ONU.
  • the OLT is configured to receive the information reported by the ONU, and the OLT sends a command for assigning the wavelength of the ONU to the ONU, and allocates a wavelength to the ONU after the time required for the wavelength tuning of the ONU arrives.
  • the state machine migration is implemented in any of the following manners:
  • Manner 1 The ONU is in the state Ox before the tuning wavelength. The ONU starts from the command to receive the wavelength to the ONU to tune the wavelength. The ONU completes the wavelength tuning and regains the downlink frame synchronization. ONU Always in the Ox state;
  • Manner 2 0NU is tuned to the state before 0x, the ONU is tuned to the wavelength, and is transferred to the intermittent downlink synchronization loss state. When the ONU completes the wavelength tuning and regains the downlink synchronization, the ONU transitions back to the state ⁇ , or the ONU transitions back to the ranging state;
  • Mode 3 The ONU is in the state before the tuning wavelength. Ox, the ONU tunes the wavelength, and shifts to the wavelength tuning state. When the ONU completes the wavelength tuning and regains the downlink synchronization, the ONU shifts back to the state Ox, or the ONU shifts back to the ranging state.
  • a wavelength tuning device in a passive optical network the device is located at the ONU;
  • the device is configured to report to the OLT at least one of a current wavelength of the ONU, an ONU wavelength tuning range, and a time required for wavelength tuning of the ONU in the ONU wavelength tuning phase.
  • the device is configured to: when the OLT allocates a bandwidth for reporting the serial number information to the ONU, the reply includes at least the serial number information of the ONU, the current use wavelength of the ONU, the ONU wavelength tuning range, and the time required for the wavelength tuning of the ONU. Two kinds of information are given to the OLT.
  • the responsive when the device is configured to allocate the bandwidth for reporting the registration information to the ONU, the responsive includes at least two of the registration information of the ONU, the current use wavelength of the ONU, the ONU wavelength tuning range, and the time required for the wavelength tuning of the ONU. Information is given to the OLT.
  • the device is configured to, when the OLT interrogates the wavelength tuning capability of the ONU, to reply to the OLT at least one of the ONU current usage wavelength, the ONU wavelength tuning range, and the time required for wavelength tuning of the ONU.
  • the state machine migration is implemented in any of the following manners:
  • Manner 1 The ONU is in the state Ox before the tuning wavelength.
  • the ONU starts to receive the wavelength command and the ONU tunes the wavelength.
  • the ONU completes the wavelength tuning and regains the downlink frame synchronization.
  • the ONU remains in the Ox state.
  • Method 2 The ONU is in the state Ox before the tuning wavelength, the ONU is tuned to the wavelength, and is transferred to the interval.
  • the downlink downlink synchronization loss state when the ONU completes the wavelength tuning and regains the downlink synchronization, the ONU shifts back to the state ⁇ , or the ONU shifts back to the ranging state;
  • Mode 3 The ONU is in the state before the tuning wavelength. Ox, the ONU tunes the wavelength, and shifts to the wavelength tuning state. When the ONU completes the wavelength tuning and regains the downlink synchronization, the ONU shifts back to the state Ox, or the ONU shifts back to the ranging state.
  • the OLT when the ONU is tuned by the wavelength, the OLT can suppress the LOS alarm about the ONU, and the ONU can also suppress the LOS alarm, ensure the normal migration of the ONU state, and protect the normal transmission of the service between the OLT and the ONU. .
  • FIG. 4 is a schematic flowchart of an implementation of a method principle according to an embodiment of the present invention. The method embodiment includes the following steps:
  • Step 101 In the ONU wavelength tuning phase, the ONU reports at least one of the ONU current use wavelength, the ONU wavelength tuning range, and the time required for the ONU wavelength tuning to the OLT.
  • Step 102 The OLT allocates a wavelength to the ONU according to the information reported by the ONU.
  • the OLT commands the ONU to tune the wavelength.
  • the OLT and ONU use the following main steps to complete the wavelength tuning of the ONU:
  • Step 1 The OLT allocates a bandwidth allocation for the ONU to report the sequence number information to the ONU in the serial number state;
  • Step 2 After receiving the bandwidth allocation in step 1, the ONU in the sequence number state replies with one or more kinds of information in the uplink bandwidth allocated by the OLT: the serial number information of the ONU, the current wavelength of the ONU, and the ONU Wavelength tuning range, the time required for wavelength tuning of the ONU;
  • Step 3 The OLT allocates a wavelength tuning command to the ONU according to the information sent by the ONU in step 2.
  • Step 4 After the ONU receives the command sent by the OLT in step 3, if the wavelength allocated by the OLT is the current wavelength used by the ONU, the ONU keeps the current used wavelength unchanged, if the wavelength allocated by the OLT is not the current used wavelength, and the ONU is in the ONU Within the range of tunable wavelengths, the ONU tunes the wavelength and shifts from the current state to the intermittent downlink loss (06). When the ONU captures the current wavelength, the OLT is in the OLT. The assigned wavelength, completes the wavelength tuning and regains the downlink synchronization, and the ONU transitions back to the current state.
  • step 5 the OLT allocates an uplink bandwidth to the ONU after the time required for the ONU wavelength to be tuned, and after the ONU completes the wavelength tuning, it responds to the uplink bandwidth allocated by the OLT.
  • the OLT allocates a bandwidth allocation for the ONU to report the sequence number information to the ONU in the sequence number state; the ONU in the sequence number state replies to one or more of the following information in the uplink bandwidth allocated by the OLT. : ONU serial number information, ONU current wavelength, ONU wavelength tuning range, ONU wavelength tuning time required.
  • the OLT may be used to allocate the bandwidth allocation for the ONU to report the sequence number information to the ONU in the running state; the ONU in the running state replies to one or more of the following information within the bandwidth allocated by the OLT. : ONU serial number information, ONU current wavelength, ONU wavelength tuning range, ONU wavelength tuning time required.
  • the OLT may be configured to allocate bandwidth allocation for reporting the registration information to the ONU in the ranging state or in the running state, and the ONU in the ranging state or the running state replies within the bandwidth allocated by the OLT.
  • One or more of the following information Serial number information of the ONU, current wavelength of the ONU, ONU wavelength tuning range, time required for wavelength tuning of the ONU.
  • steps 1 and 2 can also use 0LT to query the wavelength tuning capability of 0NU.
  • 0NU returns 0LT to one or more of the following information: 0NU current wavelength, 0NU wavelength tuning range, and 0NU wavelength tuning required time.
  • the current state of 0NU can be the running state, the serial number. Status or ranging status.
  • the ONU tunes the wavelength, it shifts from the current state to the 06 state, completes the wavelength tuning, and regains the downlink synchronization and then transfers back to the current state.
  • the ONU can also use the tuning wavelength.
  • the current state transitions to the wavelength tuning state 08 state, completes the wavelength tuning and regains the downlink synchronization and then transitions back to the current state.
  • the ONU completes the wavelength tuning from the tuning wavelength to the ONU and regains the downlink frame synchronization, and the ONU remains in the current state.
  • Step one the OLT commands the ONU to tune the wavelength, and assigns the ONU an uplink bandwidth for the time required to recover the wavelength tuning;
  • Step 2 The ONU replies with one or more of the following information: the serial number information of the ONU, the current wavelength of the ONU, the tuning range of the ONU wavelength, and the time required for the wavelength tuning of the ONU; and, if the wavelength allocated by the OLT is the current wavelength of the ONU.
  • the ONU keeps the current wavelength of use unchanged. If the wavelength allocated by the OLT is not the current wavelength of use and is within the range of the tunable wavelength of the ONU, the ONU tunes the wavelength and shifts from the current state to the intermittent downlink synchronization loss dog state. (Intermittent Loss of downstream synchronization, 06), when the ONU tuned the current wavelength to the wavelength assigned by the OLT in step 1, completes the wavelength tuning and regains the downlink synchronization, the 0NU transitions back to the current state.
  • Intermittent Loss of downstream synchronization, 06 when the ONU tuned the current wavelength to the wavelength assigned by the OLT in step 1, completes the wavelength tuning and regains the downlink synchronization,
  • step 3 the 0LT allocates an upstream bandwidth to the 0NU after the time required for the 0NU wavelength tuning, and after the 0NU completes the wavelength tuning, it responds to the upstream bandwidth allocated by the 0LT.
  • the current state of the 0NU may be the running state, the serial number state, or the ranging state.
  • the 0NU tuning wavelength when the 0NU tuning wavelength is transferred from the current state to the 06 state, the wavelength tuning is completed and the downlink synchronization is regained and then transferred back to the current state.
  • the 0NU tuning wavelength can also be used.
  • the current state is transferred to The wavelength tuning state 08 state, completes the wavelength tuning and regains the downlink synchronization and then transitions back to the current state.
  • the ONU completes the wavelength tuning from the tuning wavelength to the ONU and regains the downlink frame synchronization, and the ONU remains in the current state.
  • the OLT commands the ONU to tune the wavelength.
  • the OLT and ONU use the following main steps to complete the wavelength tuning of the ONU:
  • Step one the OLT commands the ONU to tune the wavelength, and assigns the ONU an uplink bandwidth for the time required to recover the wavelength tuning;
  • Step 2 If the wavelength allocated by the OLT is the current wavelength used by the ONU, the ONU keeps the current wavelength of use unchanged, and returns to the OLT the information of the currently used wavelength, that is, the wavelength allocated by the OLT; if the wavelength allocated by the OLT is not the current wavelength used, and The OLT commands the tuned wavelength within the range of the tunable wavelength of the ONU, and the ONU replies to the OLT with one or more of the following information: The wavelength of the ONU is tuned, and the ONU begins to tune the wavelength and from the current state Transfer to the intermittent downlink synchronization loss state (Intermittent Loss of downstream synchronization, 06), when the ONU tunes the current wavelength to the wavelength assigned by the OLT in step 1, completes the wavelength tuning and regains the downlink synchronization, and the 0NU transitions back to the current state. .
  • the intermittent downlink synchronization loss state Intermittent Loss of downstream synchronization, 06
  • step 3 the 0LT allocates an upstream bandwidth to the 0NU after the time required for the 0NU wavelength tuning, and after the 0NU completes the wavelength tuning, it responds to the upstream bandwidth allocated by the 0LT.
  • the current state of the 0NU may be the running state, the serial number state, or the ranging state.
  • the 0NU tuning wavelength when the 0NU tuning wavelength is transferred from the current state to the 06 state, the wavelength tuning is completed and the downlink synchronization is regained and then transferred back to the current state.
  • the 0NU tuning wavelength can also be used.
  • the current state transitions to the wavelength tuning state 08 state, completes the wavelength tuning and regains the downlink synchronization and then transitions back to the current state.
  • 0NU completes the wavelength tuning from the tuning wavelength to 0NU and regains the downlink Frame synchronization, ONU - remains in the current state.
  • the ONU reports at least one of the ONU current wavelength, the ONU wavelength tuning range, and the ONU wavelength tuning time to the OLT, because the OLT receives the required
  • the information can be allocated to the ONU according to the information reported by the ONU, and the ONU can respond to the bandwidth allocation allocated by the OLT. Therefore, the embodiment of the present invention solves the problem that the ONU cannot respond to the bandwidth allocation allocated by the OLT during the ONU wavelength tuning process. An alarm occurred on the side and ONU side.

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Abstract

本发明公开了一种无源光网络中的波长调谐方法，包括：光线路终端（OLT）根据光网络单元（ONU）上报的所述信息为ONU分配波长。本发明还公开了一种无源光网络中的波长调谐系统，OLT配置为根据ONU上报的所述信息为ONU分配波长。本发明还公开了一种无源光网络中的波长调谐设备，配置为在ONU波长调谐阶段，将ONU当前使用波长、ONU波长调谐范围、ONU的波长调谐需要的时间中的至少一种信息上报给OLT。采用本发明，解决了ONU波长调谐过程中ONU不能响应OLT分配的带宽或者波长分配而导致的OLT侧和ONU侧出现告警的问题。

Description

一种无源光网络中的波长调谐方法、 系统及设备 技术领域
本发明涉及通信技术领域， 尤其涉及一种无源光网络中的波长调谐方 法、 系统及设备。 背景技术
随着网络技术的发展， 可以利用网络传输大量的语音、 数据、 视频等 业务， 因此对带宽的要求不断提高， 无源光网络（PON)就是在这种需求 下产生的。
PON系统的拓朴结构如图 1所示， PON系统通常由局侧的光线路终端 (OLT)、 用户侧的光网络单元（ONU)和光分配网络 (ODN)组成， 通常 采用点到多点的网络结构。 ODN由单模光纤和光分路器、 光连接器等无源 光器件组成， 为 OLT和 ONU之间的物理连接提供光传输媒质。 目前 PON 技术中主要有时分复用 （TDM， Time Division Multiplexing) PON系统、 波 分复用 （WDM， Wavelength Division Multiplexing) PON系统、 正交频分复 用 ( OFDM, Orthogonal Frequency Division Multiplexing ) PON系统和混合 PON系统， 混合 PON系统中包括波分时分混合 PON系统、 频分时分混合 PON系统等和波分频分时分混合 PON系统。
在 WDM-PON系统中， OLT处有多个不同波长的光发射器， 各个光发 射器的光波长分别为 λ(11， λά2, …， λάη, 其中 λ(11为 OLT与第一个 ONU通信时发送下行数据采用的波长， λ d 2为 OLT与第二个 ONU通信 时发送下行数据采用的波长， …， λ(1η为 OLT与第 n个 ONU通信时发送 处发射器的发射波长， 例如第一个 ONU用于给 OLT发送上行数据的发射 器的发射波长为 λ ιιΐ , 第二个 ONU用于给 OLT发送上行数据的发射器的 发射波长为 λ u2， ...， 第 n个 ONU用于给 OLT发送上行数据的发射器的 发射波长为 λ un，采用上述技术， OLT可以同时给所有 ONU发送下行数据， 每个 ONU也可以同时发送上行数据，即 OLT和 ONU在光通道上是采用点 到点的结构。
在 OFDM-PON系统中， OLT处有多个不同的子载波，各个子载波分别 为 C l， C 2, …， C n， 且各个子载波是正交的， OLT将发送给第一个 ONU 的下行数据调制到第一个子载波上 （或者调制到第一个子载波和其他子载 波上）， OLT将发送给第二个 ONU的下行数据调制到第二个子载波上 （或 者调制到第二个子载波和其他子载波上）， …， OLT将发送给第 n个 ONU 的下行数据调制到第 n个子载波上 （或者调制到第 n个子载波和其他子载 波上）， 发送给不同 ONU的下行数据所采用的子载波之间没有交集， 即不 同的 ONU使用不同的子载波， ONU处用于给 OLT发送上行数据的子载波 与 OLT采用给当前 ONU发送下行数据的子载波相同。采用上述技术， OLT 可以同时给所有 ONU发送下行数据，每个 ONU也可以同时发送上行数据， 即 OLT和 ONU在光通道上是采用点到点的结构。
波分时分混合 PON和频分时分混合 PON系统的拓朴结构如图 2和图 3 所示，每个 OLT管理一组 ONU，波分时分混合 PON系统中的所述一组 ONU 用于发送上行数据的上行波长相同， 并且接收下行数据的下行波长也相同， 频分时分混合 PON系统中的所述一组 ONU用于发送上行数据的子载波或 者子载波组相同， 并且接收下行数据的子载波或者子载波组也相同， 所述 一组 ONU中的不同 ONU通过时分复用的方式传输上行数据。不同 OLT的 下行波长（子载波或者子载波组） 不同， 不同 OLT管理的每组 ONU使用 的上行波长（子载波或者子载波组）也不同。
在 WDM-PON和混合 PON系统中，其中混合 PON系统中的时分 PON 系统可以为吉比特无源光网络 （ GPON， Gigabit-Capable Passive Optical Network )系统、以太网无源光网络（ EPON， Ethernet Passive Optical Network ) 系统、 10G 能力的无源光网络（ XG-PON， 10-Gigabit-capable passive optical network )系统和 10G 能力的以太网无源光网络（ 10-Gigabit-capable EPON ) 系统， 考虑到 ONU的波长分配、 负载均衡、 节能、 定位异常 ONU和实现 保护倒换的目的， OLT需要调谐 ONU的波长。
在 ONU波长调谐的过程中， ONU不能响应 OLT分配的带宽分配， 从 而， 可能导致 OLT侧产生该 ONU的 LOS告警， 影响该 ONU的业务； 并 且在 ONU调谐波长时， ONU不能接收下行帧， ONU侧可能产生 LOS告警， 这也会影响 ONU的业务。
针对 ONU波长调谐过程中 OLT侧和 ONU侧出现告警的问题，现有技 术中并未提出解决该问题的方案。 发明内容
有鉴于此， 本发明实施例的主要目的在于提供一种无源光网络中的波 长调谐方法、系统及设备，解决了 ONU波长调谐过程中 ONU不能响应 OLT 分配的带宽或者波长分配而导致的 OLT侧和 ONU侧出现告警的问题。
为达到上述目的， 本发明实施例的技术方案是这样实现的：
一种无源光网络中的波长调谐方法， 该方法包括：
在光网络单元 ONU波长调谐阶段， 所述 ONU将 ONU当前使用波长、 ONU波长调谐范围、ONU的波长调谐需要的时间中的至少一种信息上报给 光线路终端 OLT;
所述 OLT根据 ONU上报的所述信息为 ONU分配波长。
其中， 在所述 ONU将 ONU当前使用波长、 ONU波长调谐范围、 ONU 的波长调谐需要的时间中的至少一种信息上报给 OLT之前，该方法还包括： 所述 OLT为所述 ONU分配用于上报序列号信息的带宽时， 所述 ONU 给所述 OLT回复信息； 回复的信息包括 ONU的序列号信息、 ONU当前使 用波长、 ONU波长调谐范围、 ONU的波长调谐需要的时间中的至少两种信 息。
其中， 在所述 ONU将 ONU当前使用波长、 ONU波长调谐范围、 ONU 的波长调谐需要的时间中的至少一种信息上报给 OLT之前，该方法还包括： 所述 OLT为所述 ONU分配用于上报注册信息的带宽时，所述 ONU给 所述 OLT回复信息； 回复的信息包括 ONU的注册信息、 ONU当前使用波 长、 ONU波长调谐范围、 ONU的波长调谐需要的时间中的至少两种信息。
其中， 在所述 ONU将 ONU当前使用波长、 ONU波长调谐范围、 ONU 的波长调谐需要的时间中的至少一种信息上报给 OLT之前，该方法还包括： 所述 OLT询问所述 ONU的波长调谐能力， 所述 ONU给所述 OLT回复信 息； 回复的信息包括 ONU当前使用波长、 ONU波长调谐范围、 ONU的波 长调谐需要的时间中的至少一种信息。
其中， 该方法还包括： ONU收到 OLT发送的分配波长的命令后， 采用 以下任一种方式实现状态机迁移：
方式一： ONU调谐波长前处于状态 Ox， ONU从收到分配波长的命令 开始到 ONU调谐波长， ONU完成波长调谐并重新获得下行帧同步， ONU 一直保持在 Ox状态；
方式二： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到间歇 性下行同步丟失状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU 转移回状态 Ox， 或者 ONU转移回测距状态；
方式三： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到波长 调谐状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU转移回状 态 Ox， 或者 ONU转移回测距状态。
一种无源光网络中的波长调谐系统， 该系统包括： 光网络单元 ONU和 光线路终端 OLT; 其中，
所述 ONU， 配置为在 ONU波长调谐阶段， 将 ONU当前使用波长、 ONU波长调谐范围、ONU的波长调谐需要的时间中的至少一种信息上报给 OLT;
所述 OLT， 配置为根据 ONU上报的所述信息为 ONU分配波长。
其中， 所述 ONU， 进一步配置为 OLT为 ONU分配用于上报序列号信 息的带宽的情况下， 回复包括 ONU的序列号信息、 ONU当前使用波长、 ONU波长调谐范围、ONU的波长调谐需要的时间中的至少两种信息给所述 OLT。
其中， 所述 ONU， 进一步配置为 OLT为 ONU分配用于上报注册信息 的带宽的情况下， 回复包括 ONU的注册信息、 ONU当前使用波长、 ONU 波长调谐范围、 ONU的波长调谐需要的时间中的至少两种信息给所述 OLT。
其中， 所述 ONU， 进一步配置为在 OLT询问 ONU的波长调谐能力的 情况下， 回复包括 ONU当前使用波长、 ONU波长调谐范围、 ONU的波长 调谐需要的时间中的至少一种信息给所述 OLT。
其中， 所述 ONU， 进一步配置为收到 OLT发送的分配波长的命令后， 采用以下任一种方式实现状态机迁移：
方式一： ONU调谐波长前处于状态 Ox， ONU从收到分配波长的命令 开始到 ONU调谐波长， ONU完成波长调谐并重新获得下行帧同步， ONU 一直保持在 Ox状态；
方式二： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到间歇 性下行同步丟失状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU 转移回状态 Ox， 或者 ONU转移回测距状态；
方式三： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到波长 调谐状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU转移回状 态 Ox， 或者 ONU转移回测距状态。
一种无源光网络中的波长调谐设备， 该设备位于光网络单元 ONU; 该设备， 配置为在 ONU波长调谐阶段， 将 ONU当前使用波长、 ONU 波长调谐范围、 ONU的波长调谐需要的时间中的至少一种信息上报给 OLT。
其中， 所述设备， 进一步配置为 OLT为 ONU分配用于上报序列号信 息的带宽的情况下， 回复包括 ONU的序列号信息、 ONU当前使用波长、 ONU波长调谐范围、ONU的波长调谐需要的时间中的至少两种信息给所述 OLT。
其中， 所述设备， 进一步配置为 OLT为 ONU分配用于上报注册信息 的带宽的情况下， 回复包括 ONU的注册信息、 ONU当前使用波长、 ONU 波长调谐范围、 ONU的波长调谐需要的时间中的至少两种信息给所述 OLT。
其中， 所述设备， 进一步配置为在 OLT询问 ONU的波长调谐能力的 情况下， 回复包括 ONU当前使用波长、 ONU波长调谐范围、 ONU的波长 调谐需要的时间中的至少一种信息给所述 OLT。
其中， 所述设备， 进一步配置为收到 OLT发送的分配波长的命令后， 采用以下任一种方式实现状态机迁移：
方式一： ONU调谐波长前处于状态 Ox， ONU从收到分配波长的命令 开始到 ONU调谐波长， ONU完成波长调谐并重新获得下行帧同步， ONU 一直保持在 Ox状态；
方式二： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到间歇 性下行同步丟失状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU 转移回状态 Ox， 或者 ONU转移回测距状态；
方式三： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到波长 调谐状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU转移回状 态 Ox， 或者 ONU转移回测距状态。 本发明实施例在 ONU波长调谐阶段， 所述 ONU将 ONU当前使用波 长、 ONU波长调谐范围、 ONU的波长调谐需要的时间中的至少一种信息上 报给 OLT; OLT根据 ONU上报的所述信息为 ONU分配波长。
采用本发明实施例， 在 ONU波长调谐阶段， 所述 ONU将 ONU当前 使用波长、 ONU波长调谐范围、 ONU的波长调谐需要的时间中的至少一种 信息上报给 OLT， 由于 OLT收到所需的所述信息， 根据 ONU上报的所述 信息能为 ONU分配波长， ONU能响应 OLT分配的带宽分配， 因此， 解决 了 ONU波长调谐过程中 ONU不能响应 OLT分配的带宽分配而导致的 OLT 侧和 ONU侧出现告警的问题。 附图说明
图 1为现有 GPON系统的拓朴结构图；
图 2为现有混合 PON系统的一种拓朴结构图；
图 3为现有混合 PON系统的另一种拓朴结构图；
图 4为本发明实施例方法原理的实现流程示意图。 具体实施方式
在本发明实施例中： 在 ONU波长调谐阶段， ONU将 ONU当前使用波 长、 ONU波长调谐范围、 ONU的波长调谐需要的时间中的至少一种信息上 报给 OLT; OLT根据 ONU上报的所述信息为 ONU分配波长。
下面结合附图对技术方案的实施作进一步的详细描述。
本发明实施例主要包括以下内容：
一种无源光网络中的波长调谐方法， 包括：
ONU将以下信息上报给 OLT:
这里， 所述信息包括 ONU当前使用波长、 ONU波长调谐范围、 ONU 的波长调谐需要的时间中的至少一种， 或称为 ONU 当前使用波长、 ONU 波长调谐范围、 ONU的波长调谐需要的时间中的一种或多种信息；
OLT根据 ONU上报的所述信息为 ONU分配波长。
优选地， OLT给 ONU分配用于上报序列号信息的带宽时， ONU给 OLT 回复下述信息中的至少两种信息： ONU的序列号信息、 ONU当前使用波长、 ONU波长调谐范围和 ONU的波长调谐需要的时间。
优选地， OLT给 ONU分配用于上报注册信息的带宽时， ONU给 OLT 回复下述信息中的至少两种信息： ONU的注册信息、 ONU当前使用波长、 ONU波长调谐范围和 ONU的波长调谐需要的时间。
优选地， OLT询问 ONU的波长调谐能力时， ONU给 OLT回复下述至 少一种信息或称为一种或者多种信息：
ONU当前使用波长、 ONU波长调谐范围和 ONU的波长调谐需要的时 间。
优选地， OLT给 ONU分配波长调谐的命令， ONU给 OLT回复下述至 少一种信息或称为一种或者多种信息：
ONU当前使用波长、 ONU波长调谐范围和 /或 ONU的波长调谐需要的 时间。
优选地， OLT收到 ONU中发送的所述信息后， 命令所述 ONU调谐 波长， 并在 ONU的波长调谐所需时间到达后给该 ONU分配波长。
优选地， ONU收到 OLT发送的分配波长的命令后， 采用下述三种方 式中的任一种实现状态机迁移：
方式一： ONU调谐波长前处于状态 Ox， ONU从收到分配波长的命令 开始到 ONU调谐波长， ONU完成波长调谐并重新获得下行帧同步， ONU 一直保持在 Ox状态；
方式二： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到间歇 当 ONU完成波长调谐， 并重新获得下行同步， ONU转移回状态 Ox， 或者 ONU转移回测距状态；
方式三： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到波长 调谐状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU转移回状 态 Ox， 或者 ONU转移回测距状态。
一种无源光网络中的波长调谐系统，该系统包括： ONU和 OLT; 其中， ONU配置为在 ONU波长调谐阶段， 将 ONU当前使用波长、 ONU波长调 谐范围、 ONU的波长调谐需要的时间中的至少一种信息上报给 OLT。 OLT 用于根据 ONU上报的所述信息为 ONU分配波长。
优选地， ONU配置为 OLT为 ONU分配用于上报序列号信息的带宽的 情况下， 回复包括 ONU的序列号信息、 ONU当前使用波长、 ONU波长调 谐范围、 ONU的波长调谐需要的时间中的至少两种信息给所述 OLT。
优选地， ONU配置为 OLT为 ONU分配用于上报注册信息的带宽的情 况下， 回复包括 ONU的注册信息、 ONU当前使用波长、 ONU波长调谐范 围、 ONU的波长调谐需要的时间中的至少两种信息给所述 OLT。
优选地， ONU配置为在 OLT询问 ONU的波长调谐能力的情况下， 回 复包括 ONU当前使用波长、 ONU波长调谐范围、 ONU的波长调谐需要的 时间中的至少一种信息给所述 OLT。
优选地， OLT 配置为在收到 ONU上报的所述信息， OLT发送 ONU分 配波长的命令给 ONU， 并在 ONU的波长调谐所需时间到达后为所述 ONU 分配波长。
优选地， ONU配置为收到 OLT发送的分配波长的命令后， 采用以下任 一种方式实现状态机迁移：
方式一： ONU调谐波长前处于状态 Ox， ONU从收到分配波长的命令 开始到 ONU调谐波长， ONU完成波长调谐并重新获得下行帧同步， ONU 一直保持在 Ox状态；
方式二： 0NU调谐波长前处于状态 0x， ONU调谐波长， 转移到间歇 性下行同步丟失状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU 转移回状态 θχ， 或者 ONU转移回测距状态；
方式三： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到波长 调谐状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU转移回状 态 Ox， 或者 ONU转移回测距状态。
一种无源光网络中的波长调谐设备， 该设备位于 ONU;
该设备， 配置为在 ONU波长调谐阶段， 将 ONU当前使用波长、 ONU 波长调谐范围、 ONU的波长调谐需要的时间中的至少一种信息上报给 OLT。
优选地， 设备配置为 OLT为 ONU分配用于上报序列号信息的带宽的 情况下， 回复包括 ONU的序列号信息、 ONU当前使用波长、 ONU波长调 谐范围、 ONU的波长调谐需要的时间中的至少两种信息给所述 OLT。
优选地， 设备配置为 OLT为 ONU分配用于上报注册信息的带宽的情 况下， 回复包括 ONU的注册信息、 ONU当前使用波长、 ONU波长调谐范 围、 ONU的波长调谐需要的时间中的至少两种信息给所述 OLT。
优选地， 设备配置为在 OLT询问 ONU的波长调谐能力的情况下， 回 复包括 ONU当前使用波长、 ONU波长调谐范围、 ONU的波长调谐需要的 时间中的至少一种信息给所述 OLT。
优选地， 设备配置为收到 OLT发送的分配波长的命令后， 采用以下任 一种方式实现状态机迁移：
方式一： ONU调谐波长前处于状态 Ox， ONU从收到分配波长的命令 开始到 ONU调谐波长， ONU完成波长调谐并重新获得下行帧同步， ONU 一直保持在 Ox状态；
方式二： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到间歇 性下行同步丟失状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU 转移回状态 θχ， 或者 ONU转移回测距状态；
方式三： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到波长 调谐状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU转移回状 态 Ox， 或者 ONU转移回测距状态。
通过采用本发明实施例的方法， ONU在波长调谐时， OLT可以抑制关 于 ONU的 LOS的告警， ONU也可以抑制 LOS告警， 保证 ONU状态的正 常迁移， 保护了 OLT与 ONU之间业务的正常传输。
如图 4为本发明实施例方法原理的实现流程示意图， 该方法实施例包 括以下步骤：
步骤 101、 在 ONU波长调谐阶段， ONU将 ONU当前使用波长、 ONU 波长调谐范围、 ONU的波长调谐需要的时间中的至少一种信息上报给 OLT。
步骤 102、 OLT根据 ONU上报的所述信息为 ONU分配波长。
具体应用实例一：
当考虑到 ONU的波长分配、 负载均衡、 节能、 解决异常 ONU问题和 保护倒换时， OLT命令 ONU调谐波长， OLT和 ONU采用下述主要步骤完 成 ONU的波长调谐：
步骤一， OLT给处于序列号状态的 ONU分配用于 ONU上报序列号信 息的带宽分配；
步骤二， 处于序列号状态的 ONU收到 OLT在步骤一分配的带宽分配 后，在 OLT分配的上行带宽内回复下述一种或者多种信息： ONU的序列号 信息， ONU当前使用波长， ONU波长调谐范围， ONU的波长调谐需要的 时间；
步骤三， OLT根据 ONU在步骤二中发送的信息给 ONU分配波长调谐 命令； 步骤四， ONU收到 OLT在步骤三中发送的命令后， 如果 OLT分配的 波长是 ONU当前使用波长， ONU保持当前的使用波长不变， 如果 OLT分 配的波长不是当前使用波长， 并且在该 ONU 可调谐的波长的范围内， 则 ONU调谐波长，并从当前状态转移到间歇性下行同步丟失状态（ Intermittent Loss of downstream synchronization, 06 )，当 ONU 夺当前的波长调 i皆为 OLT 在步骤三中分配的波长， 完成波长调谐并重新获得下行同步， ONU转移回 上述当前状态。
步骤五，OLT在 ONU波长调谐需要的时间之后给 ONU分配上行带宽， ONU完成波长调谐后， 响应 OLT分配的上行带宽。
在本应用实例中， OLT给处于序列号状态的 ONU分配用于 ONU上报 序列号信息的带宽分配； 处于序列号状态的 ONU在 OLT分配的所述上行 带宽内回复下述一种或者多种信息： ONU的序列号信息， ONU当前使用波 长， ONU波长调谐范围， ONU的波长调谐需要的时间。 在其他的应用实例 中也可以采用 OLT给处于运行状态的 ONU分配用于 ONU上报序列号信息 的带宽分配； 处于运行状态的 ONU在 OLT分配的所述带宽内回复下述一 种或者多种信息： ONU的序列号信息， ONU当前使用波长， ONU波长调 谐范围，ONU的波长调谐需要的时间。在其他的应用实例中也可以采用 OLT 给处于测距状态的或者处于运行状态的 ONU 分配用于上报注册信息的带 宽分配， 处于测距状态或者运行状态的 ONU在 OLT分配的所述带宽内回 复下述一种或者多种信息： ONU的序列号信息， ONU当前使用波长， ONU 波长调谐范围， ONU的波长调谐需要的时间。 在其他的应用实例中步骤一 和步骤二也可以采用 0LT询问 0NU的波长调谐能力， 0NU给 0LT回复下 述一种或者多种信息： 0NU当前使用波长、 0NU波长调谐范围和 0NU的 波长调谐需要的时间。
在本应用实例的步骤四中， 0NU的当前状态可以为运行状态， 序列号 状态或者测距状态。 在本应用实例中， ONU调谐波长时从所述当前状态转 移到 06状态， 完成波长调谐并重新获得下行同步后转移回所述当前状态， 在其他的应用实例中也可以采用 ONU 调谐波长时从所述当前状态转移到 波长调谐状态 08状态，完成波长调谐并重新获得下行同步后转移回所述当 前状态。 或者 ONU从调谐波长开始到 ONU完成波长调谐并重新获得下行 帧同步， ONU—直保持在所述当前状态。
具体应用实例二： 当考虑到 ONU的波长分配、 负载均衡、 节能、 解决 异常 ONU问题和保护倒换时， OLT命令 ONU调谐波长， OLT和 ONU采 用下述主要步骤完成 ONU的波长调谐：
步骤一， OLT命令 ONU调谐波长， 并给 ONU分配回复波长调谐需要 的时间的上行带宽；
步骤二， ONU回复下述一种或者多种信息： ONU的序列号信息， ONU 当前使用波长， ONU波长调谐范围， ONU的波长调谐需要的时间； 并且， 如果 OLT分配的波长是 ONU当前使用波长， ONU保持当前的使用波长不 变， 如果 OLT分配的波长不是当前使用波长， 并且在该 ONU可调谐的波 长的范围内， 则 ONU调谐波长， 并从当前状态转移到间歇性下行同步丟失 犬态 ( Intermittent Loss of downstream synchronization , 06 )， 当 ONU 夺当 前的波长调谐为 OLT在步骤一中分配的波长， 完成波长调谐并重新获得下 行同步， 0NU转移回上述当前状态。
步骤三，0LT在 0NU波长调谐需要的时间之后给 0NU分配上行带宽， 0NU完成波长调谐后， 响应 0LT分配的上行带宽。
在本应用实例的步骤四中， 0NU的当前状态可以为运行状态， 序列号 状态或者测距状态。 在本应用实例中， 0NU调谐波长时从所述当前状态转 移到 06状态， 完成波长调谐并重新获得下行同步后转移回所述当前状态， 在其他的应用实例中也可以采用 0NU 调谐波长时从所述当前状态转移到 波长调谐状态 08状态，完成波长调谐并重新获得下行同步后转移回所述当 前状态。 或者 ONU从调谐波长开始到 ONU完成波长调谐并重新获得下行 帧同步， ONU—直保持在所述当前状态。
具体应用实例三：
当考虑到 ONU的波长分配、 负载均衡、 节能、 解决异常 ONU问题和 保护倒换时， OLT命令 ONU调谐波长， OLT和 ONU采用下述主要步骤完 成 ONU的波长调谐：
步骤一， OLT命令 ONU调谐波长， 并给 ONU分配回复波长调谐需要 的时间的上行带宽；
步骤二， 如果 OLT分配的波长是 ONU当前使用波长， ONU保持当前 的使用波长不变，并给 OLT回复当前使用波长即为 OLT分配的波长的信息； 如果 OLT分配的波长不是当前使用波长，并且所述 OLT命令调谐后的波长 在该 ONU可调谐的波长的范围内， ONU给 OLT回复下述一种或者多种信 息： ONU的波长调谐需要的时间， 并且 ONU开始调谐波长， 并从当前状 态转移到间歇性下行同步丟失状态 （ Intermittent Loss of downstream synchronization, 06 )， 当 ONU将当前的波长调谐为 OLT在步骤一中分配 的波长， 完成波长调谐并重新获得下行同步， 0NU转移回上述当前状态。
步骤三，0LT在 0NU波长调谐需要的时间之后给 0NU分配上行带宽， 0NU完成波长调谐后， 响应 0LT分配的上行带宽。
在本应用实例的步骤四中， 0NU的当前状态可以为运行状态， 序列号 状态或者测距状态。 在本应用实例中， 0NU调谐波长时从所述当前状态转 移到 06状态， 完成波长调谐并重新获得下行同步后转移回所述当前状态， 在其他的应用实例中也可以采用 0NU 调谐波长时从所述当前状态转移到 波长调谐状态 08状态，完成波长调谐并重新获得下行同步后转移回所述当 前状态。 或者 0NU从调谐波长开始到 0NU完成波长调谐并重新获得下行 帧同步， ONU—直保持在所述当前状态。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。 工业实用性
本发明实施例在 ONU波长调谐阶段， 所述 ONU将 ONU当前使用波 长、 ONU波长调谐范围、 ONU的波长调谐需要的时间中的至少一种信息上 报给 OLT， 由于 OLT收到所需的所述信息， 根据 ONU上报的所述信息能 为 ONU分配波长， ONU能响应 OLT分配的带宽分配， 因此， 采用本发明 实施例解决了 ONU波长调谐过程中 ONU不能响应 OLT分配的带宽分配而 导致的 OLT侧和 ONU侧出现告警的问题。

Claims

权利要求书
1、 一种无源光网络中的波长调谐方法， 该方法包括：
在光网络单元 ONU波长调谐阶段， 所述 ONU将 ONU当前使用波长、 ONU波长调谐范围、ONU的波长调谐需要的时间中的至少一种信息上报给 光线路终端 OLT;
所述 OLT根据 ONU上报的所述信息为 ONU分配波长。
2、根据权利要求 1所述的方法， 其中， 在所述 ONU将 ONU当前使用 波长、 ONU波长调谐范围、 ONU的波长调谐需要的时间中的至少一种信息 上报给 OLT之前， 该方法还包括：
所述 OLT为所述 ONU分配用于上报序列号信息的带宽时， 所述 ONU 给所述 OLT回复信息； 回复的信息包括 ONU的序列号信息、 ONU当前使 用波长、 ONU波长调谐范围、 ONU的波长调谐需要的时间中的至少两种信 息。
3、根据权利要求 1所述的方法， 其中， 在所述 ONU将 ONU当前使用 波长、 ONU波长调谐范围、 ONU的波长调谐需要的时间中的至少一种信息 上报给 OLT之前， 该方法还包括：
所述 OLT为所述 ONU分配用于上报注册信息的带宽时，所述 ONU给 所述 OLT回复信息； 回复的信息包括 ONU的注册信息、 ONU当前使用波 长、 ONU波长调谐范围、 ONU的波长调谐需要的时间中的至少两种信息。
4、根据权利要求 1所述的方法， 其中， 在所述 ONU将 ONU当前使用 波长、 ONU波长调谐范围、 ONU的波长调谐需要的时间中的至少一种信息 上报给 OLT之前， 该方法还包括： 所述 OLT询问所述 ONU的波长调谐能 力，所述 ONU给所述 OLT回复信息；回复的信息包括 ONU当前使用波长、 ONU波长调谐范围、 ONU的波长调谐需要的时间中的至少一种信息。
5、根据权利要求 1所述的方法， 其中， 该方法还包括： ONU收到 OLT 发送的分配波长的命令后， 采用以下任一种方式实现状态机迁移： 方式一： ONU调谐波长前处于状态 Ox， ONU从收到分配波长的命令 开始到 ONU调谐波长， ONU完成波长调谐并重新获得下行帧同步， ONU 一直保持在 Ox状态；
方式二： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到间歇 性下行同步丟失状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU 转移回状态 Ox， 或者 ONU转移回测距状态；
方式三： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到波长 调谐状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU转移回状 态 Ox， 或者 ONU转移回测距状态。
6、一种无源光网络中的波长调谐系统， 该系统包括： 光网络单元 ONU 和光线路终端 OLT; 其中，
所述 ONU， 配置为在 ONU波长调谐阶段， 将 ONU当前使用波长、 ONU波长调谐范围、ONU的波长调谐需要的时间中的至少一种信息上报给 OLT;
所述 OLT， 配置为根据 ONU上报的所述信息为 ONU分配波长。
7、根据权利要求 6所述的系统， 其中， 所述 ONU， 进一步配置为 OLT 为 ONU分配用于上报序列号信息的带宽的情况下， 回复包括 ONU的序列 号信息、 ONU当前使用波长、 ONU波长调谐范围、 ONU的波长调谐需要 的时间中的至少两种信息给所述 OLT。
8、根据权利要求 6所述的系统， 其中， 所述 ONU， 进一步配置为 OLT 为 ONU分配用于上报注册信息的带宽的情况下， 回复包括 ONU的注册信 息、 ONU当前使用波长、 ONU波长调谐范围、 ONU的波长调谐需要的时 间中的至少两种信息给所述 OLT。
9、 根据权利要求 6所述的系统， 其中， 所述 ONU， 进一步配置为在 OLT询问 ONU的波长调谐能力的情况下， 回复包括 ONU当前使用波长、 ONU波长调谐范围、ONU的波长调谐需要的时间中的至少一种信息给所述 OLT。
10、 根据权利要求 6所述的系统， 其中， 所述 ONU， 进一步配置为收 到 OLT发送的分配波长的命令后， 采用以下任一种方式实现状态机迁移： 方式一： ONU调谐波长前处于状态 Ox， ONU从收到分配波长的命令 开始到 ONU调谐波长， ONU完成波长调谐并重新获得下行帧同步， ONU 一直保持在 Ox状态；
方式二： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到间歇 性下行同步丟失状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU 转移回状态 Ox， 或者 ONU转移回测距状态；
方式三： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到波长 调谐状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU转移回状 态 Ox， 或者 ONU转移回测距状态。
11、一种无源光网络中的波长调谐设备，该设备位于光网络单元 ONU; 该设备， 配置为在 ONU波长调谐阶段， 将 ONU当前使用波长、 ONU 波长调谐范围、 ONU的波长调谐需要的时间中的至少一种信息上报给 OLT。
12、 根据权利要求 11 所述的设备， 其中， 所述设备， 进一步配置为 OLT为 ONU分配用于上报序列号信息的带宽的情况下， 回复包括 ONU的 序列号信息、 ONU当前使用波长、 ONU波长调谐范围、 ONU的波长调谐 需要的时间中的至少两种信息给所述 OLT。
13、 根据权利要求 11 所述的设备， 其中， 所述设备， 进一步配置为 OLT为 ONU分配用于上报注册信息的带宽的情况下， 回复包括 ONU的注 册信息、 ONU当前使用波长、 ONU波长调谐范围、 ONU的波长调谐需要 的时间中的至少两种信息给所述 OLT。
14、 根据权利要求 11所述的设备， 其中， 所述设备， 进一步配置为在 OLT询问 ONU的波长调谐能力的情况下， 回复包括 ONU当前使用波长、 ONU波长调谐范围、ONU的波长调谐需要的时间中的至少一种信息给所述 OLT。
15、 根据权利要求 11所述的设备， 其中， 所述设备， 进一步配置为收 到 OLT发送的分配波长的命令后， 采用以下任一种方式实现状态机迁移： 方式一： ONU调谐波长前处于状态 Ox， ONU从收到分配波长的命令 开始到 ONU调谐波长， ONU完成波长调谐并重新获得下行帧同步， ONU 一直保持在 Ox状态；
方式二： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到间歇 性下行同步丟失状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU 转移回状态 Ox， 或者 ONU转移回测距状态；
方式三： ONU调谐波长前处于状态 Ox， ONU调谐波长， 转移到波长 调谐状态， 当 ONU完成波长调谐， 并重新获得下行同步， ONU转移回状 态 Ox， 或者 ONU转移回测距状态。
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