CN103841474A - Passive optical network wavelength tuning method, system and device - Google Patents

Passive optical network wavelength tuning method, system and device Download PDF

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Publication number
CN103841474A
CN103841474A CN201210480965.6A CN201210480965A CN103841474A CN 103841474 A CN103841474 A CN 103841474A CN 201210480965 A CN201210480965 A CN 201210480965A CN 103841474 A CN103841474 A CN 103841474A
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China
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onu
wavelength
olt
tuning
wavelength tuning
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CN201210480965.6A
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CN103841474B (en
Inventor
耿丹
张伟良
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ZTE Corp
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ZTE Corp
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Priority to CN201210480965.6A priority Critical patent/CN103841474B/en
Priority to PCT/CN2013/080853 priority patent/WO2013189321A1/en
Publication of CN103841474A publication Critical patent/CN103841474A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—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

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Small-Scale Networks (AREA)

Abstract

The invention discloses a passive optical network wavelength tuning method. The method comprises an optical line terminal (OLT) which allocates a wavelength to an optical network unit (ONU) according to information reported by the ONU. The invention also discloses a passive optical network wavelength tuning system. An OLT is used to allocate a wavelength to an ONU according to information reported by the ONU. The invention also discloses a passive optical network wavelength tuning device, which is used in an ONU wavelength tuning phase and reports at least one of the following information to an OLT: a current wavelength used by an ONU, a wavelength tuning range of the ONU and time required for ONU wavelength tuning. The method, the system and the device solves the problem that during ONU wavelength tuning, an ONU cannot response to a bandwidth allocated by an OLT or wavelength allocation induces warnings on the OLT side and the ONU side.

Description

Wavelength tuning method, system and equipment in passive optical network
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, a system, and a device for tuning a wavelength in a passive optical network.
Background
With the development of network technology, a large amount of services such as voice, data, video and the like can be transmitted by using a network, so that the requirement for bandwidth is continuously increased, and a Passive Optical Network (PON) is generated under the requirement.
As shown in fig. 1, a PON system generally includes an Optical Line Terminal (OLT) on a central office side, an Optical Network Unit (ONU) on a subscriber side, and an Optical Distribution Network (ODN), and generally adopts a point-to-multipoint network structure. The ODN is composed of a single-mode optical fiber, an optical splitter, an optical connector, and other passive optical devices, and provides an optical transmission medium for physical connection between the OLT and the ONU. In the PON technology, a Time Division Multiplexing (TDM) PON system, a Wavelength Division Multiplexing (WDM) PON system, an Orthogonal Frequency Division Multiplexing (OFDM) PON system, and a hybrid PON system are mainly used, and 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 frequency Division Time Division hybrid PON system.
In a WDM-PON system, an OLT has a plurality of optical transmitters with different wavelengths, and the optical wavelengths of the optical transmitters are λ d1, λ d2,. and λ dn, respectively, where λ d1 is a wavelength used by the OLT to transmit downstream data when communicating with a first ONU, λ d2 is a wavelength used by the OLT to transmit downstream data when communicating with a second ONU, and λ dn is a wavelength used by the OLT to transmit downstream data when communicating with an nth ONU; the generation wavelength of the transmitter at each ONU is different from the transmission wavelengths of the transmitters at other ONUs, for example, the transmission wavelength of the transmitter used by the first ONU to send upstream data to the OLT is λ u1, the transmission wavelength of the transmitter used by the second ONU to send upstream data to the OLT is λ u 2.
In the OFDM-PON system, there are a plurality of different sub-carriers at the OLT, each of which is C1, C2.., Cn, the OLT modulates the downlink data sent to the second ONU to the second subcarrier (or to the second subcarrier 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 there is no intersection between the subcarriers used by the downlink data sent to different ONUs, that is, different ONUs use different subcarriers, and the subcarriers used by the ONUs to send uplink data to the OLT are the same as the subcarriers used by the OLT to send downlink data to the current ONU. By adopting the technology, the OLT can simultaneously send downlink data to all the ONUs, and each ONU can also simultaneously send uplink data, namely, the OLT and the ONUs adopt a point-to-point structure on an optical channel.
As shown in fig. 2 and 3, each OLT manages a group of ONUs, the uplink wavelengths used by the ONUs in the wdm-wdm system to transmit uplink data are the same, the downlink wavelengths used by the ONUs to receive downlink data are the same, the subcarriers or subcarrier groups used by the ONUs in the fdd-tdm system to transmit uplink data are the same, the subcarriers or subcarrier groups used by the ONUs in the fdd-tdm system to receive downlink data are the same, and different ONUs in the group of ONUs transmit uplink data in a tdm manner. 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.
In a WDM-PON system and a hybrid PON system, wherein a time division PON system in the hybrid PON system may be a Gigabit-Capable Passive Optical Network (GPON) system, an Ethernet Passive Optical Network (EPON) system, a 10G-Capable Passive Optical Network (XG-PON, 1O-Gigabit-Capable Passive Optical Network) system, and a 10G-Capable Ethernet Passive Optical Network (10-Gigabit-Capable PON) system, and the OLT needs to tune a wavelength of an ONU in consideration of wavelength allocation, load balancing, energy saving, positioning of an abnormal ONU, and realization of protection switching of the ONU.
In the process of tuning the wavelength of the ONU, the ONU cannot respond to the bandwidth allocation allocated by the OLT, which may cause the OLT side to generate an LOS alarm of the ONU, thereby affecting the service of the ONU; and when the ONU adjusts the wavelength, the ONU cannot receive the downlink frame, and the ONU side may generate an LOS alarm, which also affects the service of the ONU.
Aiming at the problem that alarms occur at an OLT side and an ONU side in the ONU wavelength tuning process, a scheme for solving the problem is not provided in the prior art.
Disclosure of Invention
In view of this, the main objective of the present invention is to provide a method, a system, and a device for tuning a wavelength in a passive optical network, which solve the problem that an OLT side and an ONU side alarm due to the fact that an ONU cannot respond to a bandwidth allocated by an OLT or a wavelength allocation in an ONU wavelength tuning process.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method of wavelength tuning in a passive optical network, the method comprising:
in the wavelength tuning stage of an Optical Network Unit (ONU), the ONU reports at least one of the current used wavelength of the ONU, the wavelength tuning range of the ONU and the time required by the wavelength tuning of the ONU to an Optical Line Terminal (OLT);
and the OLT allocates wavelength for the ONU according to the information reported by the ONU.
Before the ONU reports at least one of the currently used wavelength of the ONU, the wavelength tuning range of the ONU, and the time required for tuning the wavelength of the ONU to the OLT, the method further includes:
when the OLT allocates a bandwidth for reporting serial number information to the ONU, the ONU replies information to the OLT; the replied information comprises at least two information of the serial number information of the ONU, the current wavelength used by the ONU, the wavelength tuning range of the ONU and the time required by the wavelength tuning of the ONU.
Before the ONU reports at least one of the currently used wavelength of the ONU, the wavelength tuning range of the ONU, and the time required for tuning the wavelength of the ONU to the OLT, the method further includes:
when the OLT allocates a bandwidth for reporting registration information to the ONU, the ONU replies information to the OLT; the replied information comprises at least two information of the registration information of the ONU, the current used wavelength of the ONU, the wavelength tuning range of the ONU and the time required by the wavelength tuning of the ONU.
Before the ONU reports at least one of the currently used wavelength of the ONU, the wavelength tuning range of the ONU, and the time required for tuning the wavelength of the ONU to the OLT, the method further includes: the OLT inquires the wavelength tuning capability of the ONU, and the ONU replies information to the OLT; the returned information comprises at least one of the current used wavelength of the ONU, the wavelength tuning range of the ONU and the time required for the wavelength tuning of the ONU.
Wherein, the method also comprises: after receiving a wavelength allocation command sent by the OLT, the ONU realizes state machine migration by adopting any one of the following modes:
the first method is as follows: before the ONU tunes the wavelength, the ONU is in a state Ox, the ONU tunes the wavelength from the moment the ONU receives a command of distributing the wavelength, the ONU finishes tuning the wavelength and obtains the downlink frame synchronization again, and the ONU is kept in the state Ox all the time;
the second method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to an intermittent downlink synchronization loss state, and when the ONU finishes tuning the wavelength and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state;
the third method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to a wavelength tuning state, and when the ONU finishes wavelength tuning and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state.
A wavelength tuning system in a passive optical network, the system comprising: an optical network unit ONU and an optical line terminal OLT; wherein,
the ONU is used for reporting at least one of the current used wavelength of the ONU, the wavelength tuning range of the ONU and the time required by the wavelength tuning of the ONU to the OLT in the wavelength tuning stage of the ONU;
and the OLT is used for allocating 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, reply at least two information including the serial number information of the ONU, a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for tuning the wavelength of the ONU to the OLT.
The ONU is further configured to, when the OLT allocates a bandwidth for reporting the registration information to the ONU, reply at least two information including the registration information of the ONU, a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for tuning the wavelength of the ONU to the OLT.
The ONU is further configured to, when the OLT queries the wavelength tuning capability of the ONU, reply information including at least one of a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU to the OLT.
The ONU is further configured to implement state machine migration by using any one of the following manners after receiving a wavelength allocation command sent by the OLT:
the first method is as follows: before the ONU tunes the wavelength, the ONU is in a state Ox, the ONU tunes the wavelength from the moment the ONU receives a command of distributing the wavelength, the ONU finishes tuning the wavelength and obtains the downlink frame synchronization again, and the ONU is kept in the state Ox all the time;
the second method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to an intermittent downlink synchronization loss state, and when the ONU finishes tuning the wavelength and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state;
the third method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to a wavelength tuning state, and when the ONU finishes wavelength tuning and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state.
A wavelength tuning device in a passive optical network, the device located at an optical network unit, ONU;
the equipment is used for reporting at least one of the current used wavelength of the ONU, the wavelength tuning range of the ONU and the time required by the wavelength tuning of the ONU to the OLT in the wavelength tuning stage of the ONU.
The device is further configured to, when the OLT allocates a bandwidth for reporting the serial number information to the ONU, reply to the OLT with at least two information including the serial number information of the ONU, a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for tuning the wavelength of the ONU.
The device is further configured to, when the OLT allocates a bandwidth for reporting the registration information to the ONU, reply to the OLT with at least two types of information including the registration information of the ONU, a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for tuning the wavelength of the ONU.
The device is further configured to, when the OLT queries the wavelength tuning capability of the ONU, reply information including at least one of a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU to the OLT.
The device is further configured to implement state machine migration in any one of the following manners after receiving a wavelength allocation command sent by the OLT:
the first method is as follows: before the ONU tunes the wavelength, the ONU is in a state Ox, the ONU tunes the wavelength from the moment the ONU receives a command of distributing the wavelength, the ONU finishes tuning the wavelength and obtains the downlink frame synchronization again, and the ONU is kept in the state Ox all the time;
the second method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to an intermittent downlink synchronization loss state, and when the ONU finishes tuning the wavelength and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state;
the third method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to a wavelength tuning state, and when the ONU finishes wavelength tuning and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state.
In the ONU wavelength tuning stage, the ONU reports at least one of the current used wavelength of the ONU, the ONU wavelength tuning range and the time required by the ONU wavelength tuning to the OLT; and the OLT allocates wavelength for the ONU according to the information reported by the ONU.
By adopting the invention, in the ONU wavelength tuning stage, the ONU reports at least one of the current used wavelength of the ONU, the ONU wavelength tuning range and the time required by the ONU wavelength tuning to the OLT, because the OLT receives the required information, the ONU can be allocated with the wavelength according to the information reported by the ONU, and the ONU can respond to the bandwidth allocation allocated by the OLT, the problem that the OLT side and the ONU side are alarmed because the ONU can not respond to the bandwidth allocation allocated by the OLT in the ONU wavelength tuning process is solved.
Drawings
Fig. 1 is a topology structure diagram of a conventional GPON system;
fig. 2 is a topology structure diagram of a conventional hybrid PON system;
fig. 3 is another topology structure diagram of the existing hybrid PON system;
fig. 4 is a schematic flow chart of the implementation of the principle of the method of the present invention.
Detailed Description
The basic idea of the invention is: in the ONU wavelength tuning stage, the ONU reports at least one of the current used wavelength of the ONU, the ONU wavelength tuning range and the time required by the ONU wavelength tuning to the OLT; and the OLT allocates wavelength for the ONU according to the information reported by the ONU.
The following describes the embodiments in further detail with reference to the accompanying drawings.
The invention mainly comprises the following contents:
a method of wavelength tuning in a passive optical network, comprising:
the ONU reports the following information to the OLT:
here, the information includes at least one of a wavelength currently used by the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU, or one or more of information called the wavelength currently used by the ONU, the wavelength tuning range of the ONU, and the time required for wavelength tuning of the ONU;
and the OLT allocates wavelength for the ONU according to the information reported by the ONU.
Further, when the OLT allocates a bandwidth for reporting the serial number information to the ONU, the ONU replies at least two kinds of information among the following information to the OLT: the ONU serial number information, the ONU currently used wavelength, the ONU wavelength tuning range and the time required for the ONU wavelength tuning.
Further, when the OLT allocates a bandwidth for reporting the registration information to the ONU, the ONU replies at least two kinds of information among the following information to the OLT: the method comprises the following steps of registering information of the ONU, the currently used wavelength of the ONU, the wavelength tuning range of the ONU and the time required for the wavelength tuning of the ONU.
Further, when the OLT queries the wavelength tuning capability of the ONU, the ONU sends back at least one of the following information or one or more information to the OLT:
the ONU currently uses a wavelength, an ONU wavelength tuning range, and a time required for wavelength tuning of the ONU.
Further, the OLT assigns a wavelength tuning command to the ONU, and the ONU sends back at least one of the following information or one or more information to the OLT:
the ONU currently uses a wavelength, an ONU wavelength tuning range, and/or a time required for wavelength tuning of the ONU.
Further, after receiving the information sent by the ONU, the OLT commands the ONU to tune the wavelength, and allocates the wavelength to the ONU after the time required for wavelength tuning of the ONU arrives.
Further, after receiving the wavelength allocation command sent by the OLT, the ONU implements state machine transition in any one of the following three ways:
the first method is as follows: before the ONU tunes the wavelength, the ONU is in a state Ox, the ONU tunes the wavelength from the moment the ONU receives a command of distributing the wavelength, the ONU finishes tuning the wavelength and obtains the downlink frame synchronization again, and the ONU is kept in the state Ox all the time;
the second method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to an Intermittent downlink synchronization Loss state (O6), and when the ONU completes the wavelength tuning and obtains the downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to the ranging state;
the third method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to a wavelength tuning state, and when the ONU finishes wavelength tuning and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state.
A wavelength tuning system in a passive optical network, the system comprising: ONU and OLT; the ONU is used for reporting at least one of the current used wavelength of the ONU, the wavelength tuning range of the ONU and the time required by the wavelength tuning of the ONU to the OLT in the wavelength tuning stage of the ONU. And the OLT is used for allocating the wavelength to the ONU according to the information reported by the ONU.
Further, the ONU is configured to, when the OLT allocates a bandwidth for reporting the serial number information to the ONU, reply to the OLT, information including at least two of the serial number information of the ONU, a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU.
Further, the ONU is configured to, when the OLT allocates a bandwidth for reporting the registration information to the ONU, reply to the OLT with at least two information including the registration information of the ONU, a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU.
Further, the ONU is configured to reply, to the OLT, information including at least one of a wavelength currently used by the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU, in a case where the OLT queries a wavelength tuning capability of the ONU.
Further, the OLT is configured to send, to the ONU, a wavelength assignment command for the ONU when receiving the information reported by the ONU, and assign a wavelength to the ONU after a time required for wavelength tuning of the ONU arrives.
Further, after receiving the wavelength assignment command sent by the OLT, the ONU implements state machine transition by using any one of the following methods:
the first method is as follows: before the ONU tunes the wavelength, the ONU is in a state Ox, the ONU tunes the wavelength from the moment the ONU receives a command of distributing the wavelength, the ONU finishes tuning the wavelength and obtains the downlink frame synchronization again, and the ONU is kept in the state Ox all the time;
the second method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to an intermittent downlink synchronization loss state, and when the ONU finishes tuning the wavelength and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state;
the third method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to a wavelength tuning state, and when the ONU finishes wavelength tuning and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state.
A wavelength tuning device in a passive optical network, the device located at an ONU;
the equipment is used for reporting at least one of the current used wavelength of the ONU, the wavelength tuning range of the ONU and the time required by the wavelength tuning of the ONU to the OLT in the wavelength tuning stage of the ONU.
Further, the device is configured to, when the OLT allocates a bandwidth for reporting the serial number information to the ONU, reply to the OLT with at least two kinds of information including the serial number information of the ONU, a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU.
Further, the device is configured to, when the OLT allocates a bandwidth for reporting the registration information to the ONU, reply to the OLT with at least two types of information including the registration information of the ONU, a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU.
Further, the device is configured to reply, to the OLT, information including at least one of a wavelength currently used by the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU, in a case where the OLT queries a wavelength tuning capability of the ONU.
Further, after receiving the wavelength allocation command sent by the OLT, the device is configured to implement state machine migration in any one of the following manners:
the first method is as follows: before the ONU tunes the wavelength, the ONU is in a state Ox, the ONU tunes the wavelength from the moment the ONU receives a command of distributing the wavelength, the ONU finishes tuning the wavelength and obtains the downlink frame synchronization again, and the ONU is kept in the state Ox all the time;
the second method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to an intermittent downlink synchronization loss state, and when the ONU finishes tuning the wavelength and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state;
the third method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to a wavelength tuning state, and when the ONU finishes wavelength tuning and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state.
By adopting the method of the invention, when the ONU tunes the wavelength, the OLT can restrain the LOS alarm of the ONU, and the ONU can restrain the LOS alarm, thereby ensuring the normal migration of the ONU state and protecting the normal transmission of the service between the OLT and the ONU.
Fig. 4 is a schematic diagram of an implementation flow of the principle of the method of the present invention, and the embodiment of the method includes the following steps:
step 101, in the ONU wavelength tuning stage, the ONU reports at least one of the currently used wavelength of the ONU, the ONU wavelength tuning range, and the time required for the wavelength tuning of the ONU to the OLT.
And 102, the OLT allocates the wavelength for the ONU according to the information reported by the ONU.
Specific application example one:
when wavelength allocation, load balancing, energy saving, abnormal ONU problem solving and protection switching of the ONU are considered, the OLT commands the ONU to tune the wavelength, and the OLT and the ONU adopt the following main steps to finish the wavelength tuning of the ONU:
step one, an OLT allocates a bandwidth for an ONU in a serial number state to report serial number information;
step two, after receiving the bandwidth allocation allocated by the OLT in step one, the ONU in the serial number state replies one or more of the following information in the uplink bandwidth allocated by the OLT: the method comprises the following steps of ONU serial number information, the ONU currently used wavelength, the ONU wavelength tuning range and the time required by the ONU wavelength tuning;
step three, the OLT distributes a wavelength tuning command to the ONU according to the information sent by the ONU in the step two;
and step four, after the ONU receives the command sent by the OLT in step three, if the wavelength allocated by the OLT is the current used wavelength of the ONU, the ONU keeps the current used wavelength unchanged, if the wavelength allocated by the OLT is not the current used wavelength and is within the range of the wavelength tunable by the ONU, the ONU tunes the wavelength and shifts from the current state to an Intermittent downlink synchronization Loss state (O6), and when the ONU tunes the current wavelength to the wavelength allocated by the OLT in step three, the ONU completes wavelength tuning and reacquires downlink synchronization, and shifts back to the current state.
And step five, the OLT allocates the uplink bandwidth to the ONU after the time required by the wavelength tuning of the ONU, and the ONU responds to the uplink bandwidth allocated by the OLT after the wavelength tuning of the ONU is finished.
In the application example, the OLT allocates bandwidth allocation for reporting serial number information by the ONU to the ONU in the serial number state; the ONU in the serial number state replies one or more of the following information in the upstream bandwidth allocated by the OLT: the ONU wavelength tuning method comprises the following steps of ONU serial number information, the ONU currently used wavelength, the ONU wavelength tuning range and the time required by the ONU wavelength tuning. In other application examples, the OLT can also be adopted to allocate the bandwidth for the ONU in the running state to report the serial number information; the ONU in the running state replies one or more of the following information in the bandwidth allocated by the OLT: the ONU wavelength tuning method comprises the following steps of ONU serial number information, the ONU currently used wavelength, the ONU wavelength tuning range and the time required by the ONU wavelength tuning. In other application examples, the OLT may also allocate bandwidth allocation for reporting registration information to an ONU in a ranging state or an operating state, and the ONU in the ranging state or the operating state replies one or more of the following information within the bandwidth allocated by the OLT: the ONU wavelength tuning method comprises the following steps of ONU serial number information, the ONU currently used wavelength, the ONU wavelength tuning range and the time required by the ONU wavelength tuning. In other application examples, the OLT may also be used to query the wavelength tuning capability of the ONU in step one and step two, and the ONU replies to the OLT with one or more of the following information: the ONU currently uses a wavelength, an ONU wavelength tuning range, and a time required for wavelength tuning of the ONU.
In step four of this application example, the current state of the ONU may be a running state, a serial number state, or a ranging state. In this application example, the ONU performs wavelength tuning and acquires downlink synchronization again, and then transfers to the O6 state, and in other application examples, the ONU performs wavelength tuning and acquires downlink synchronization again, and then transfers to the O8 state, and then performs wavelength tuning and acquires downlink synchronization again, and then transfers to the current state. Or the ONU finishes wavelength tuning from the beginning of wavelength tuning to the ONU and acquires downlink frame synchronization again, and the ONU is kept in the current state all the time.
Specific application example two: when wavelength allocation, load balancing, energy saving, abnormal ONU problem solving and protection switching of the ONU are considered, the OLT commands the ONU to tune the wavelength, and the OLT and the ONU adopt the following main steps to finish the wavelength tuning of the ONU:
step one, an OLT commands an ONU to tune a wavelength, and allocates an uplink bandwidth for the time required by the tuning of a reply wavelength to the ONU;
and step two, the ONU replies one or more of the following information: the method comprises the following steps of ONU serial number information, the ONU currently used wavelength, the ONU wavelength tuning range and the time required by the ONU wavelength tuning; and if the wavelength allocated by the OLT is the current usage wavelength of the ONU, the ONU keeps the current usage wavelength unchanged, if the wavelength allocated by the OLT is not the current usage wavelength and is within the wavelength range that the ONU can tune, the ONU tunes the wavelength and shifts from the current state to an intermittent downstream synchronization loss state (O6), and when the ONU tunes the current wavelength to the wavelength allocated by the OLT in the first step, the ONU completes the wavelength tuning and reacquires downstream synchronization, and the ONU shifts back to the current state.
And step three, the OLT allocates the uplink bandwidth to the ONU after the time required by the wavelength tuning of the ONU, and the ONU responds to the uplink bandwidth allocated by the OLT after the wavelength tuning of the ONU is finished.
In step four of this application example, the current state of the ONU may be a running state, a serial number state, or a ranging state. In this application example, the ONU performs wavelength tuning and acquires downlink synchronization again, and then transfers to the O6 state, and in other application examples, the ONU performs wavelength tuning and acquires downlink synchronization again, and then transfers to the O8 state, and then performs wavelength tuning and acquires downlink synchronization again, and then transfers to the current state. Or the ONU finishes wavelength tuning from the beginning of wavelength tuning to the ONU and acquires downlink frame synchronization again, and the ONU is kept in the current state all the time.
Specific application example three:
when wavelength allocation, load balancing, energy saving, abnormal ONU problem solving and protection switching of the ONU are considered, the OLT commands the ONU to tune the wavelength, and the OLT and the ONU adopt the following main steps to finish the wavelength tuning of the ONU:
step one, an OLT commands an ONU to tune a wavelength, and allocates an uplink bandwidth for the time required by the tuning of a reply wavelength to the ONU;
step two, if the wavelength allocated by the OLT is the current use wavelength of the ONU, the ONU keeps the current use wavelength unchanged, and replies information that the current use wavelength is the wavelength allocated by the OLT to the OLT; if the wavelength allocated by the OLT is not the currently used wavelength and the OLT commands the tuned wavelength to be within the range of the wavelength tunable by the ONU, the ONU replies one or more of the following information to the OLT: and (3) the time required by the wavelength tuning of the ONU, starting the wavelength tuning of the ONU, and shifting from the current state to an Intermittent downlink synchronization Loss state (O6), and when the ONU tunes the current wavelength to the wavelength allocated by the OLT in the step one, completing the wavelength tuning and reacquiring downlink synchronization, the ONU shifts back to the current state.
And step three, the OLT allocates the uplink bandwidth to the ONU after the time required by the wavelength tuning of the ONU, and the ONU responds to the uplink bandwidth allocated by the OLT after the wavelength tuning of the ONU is finished.
In step four of this application example, the current state of the ONU may be a running state, a serial number state, or a ranging state. In this application example, the ONU performs wavelength tuning and acquires downlink synchronization again, and then transfers to the O6 state, and in other application examples, the ONU performs wavelength tuning and acquires downlink synchronization again, and then transfers to the O8 state, and then performs wavelength tuning and acquires downlink synchronization again, and then transfers to the current state. Or the ONU finishes wavelength tuning from the beginning of wavelength tuning to the ONU and acquires downlink frame synchronization again, and the ONU is kept in the current state all the time.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (15)

1. A method of wavelength tuning in a passive optical network, the method comprising:
in the wavelength tuning stage of an Optical Network Unit (ONU), the ONU reports at least one of the current used wavelength of the ONU, the wavelength tuning range of the ONU and the time required by the wavelength tuning of the ONU to an Optical Line Terminal (OLT);
and the OLT allocates wavelength for the ONU according to the information reported by the ONU.
2. The method of claim 1, wherein before the ONU reports to the OLT at least one of a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU, the method further comprises:
when the OLT allocates a bandwidth for reporting serial number information to the ONU, the ONU replies information to the OLT; the replied information comprises at least two information of the serial number information of the ONU, the current wavelength used by the ONU, the wavelength tuning range of the ONU and the time required by the wavelength tuning of the ONU.
3. The method of claim 1, wherein before the ONU reports to the OLT at least one of a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU, the method further comprises:
when the OLT allocates a bandwidth for reporting registration information to the ONU, the ONU replies information to the OLT; the replied information comprises at least two information of the registration information of the ONU, the current used wavelength of the ONU, the wavelength tuning range of the ONU and the time required by the wavelength tuning of the ONU.
4. The method of claim 1, wherein before the ONU reports to the OLT at least one of a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU, the method further comprises: the OLT inquires the wavelength tuning capability of the ONU, and the ONU replies information to the OLT; the returned information comprises at least one of the current used wavelength of the ONU, the wavelength tuning range of the ONU and the time required for the wavelength tuning of the ONU.
5. The method of claim 1, further comprising: after receiving a wavelength allocation command sent by the OLT, the ONU realizes state machine migration by adopting any one of the following modes:
the first method is as follows: before the ONU tunes the wavelength, the ONU is in a state Ox, the ONU tunes the wavelength from the moment the ONU receives a command of distributing the wavelength, the ONU finishes tuning the wavelength and obtains the downlink frame synchronization again, and the ONU is kept in the state Ox all the time;
the second method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to an intermittent downlink synchronization loss state, and when the ONU finishes tuning the wavelength and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state;
the third method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to a wavelength tuning state, and when the ONU finishes wavelength tuning and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state.
6. A wavelength tuning system in a passive optical network, the system comprising: an optical network unit ONU and an optical line terminal OLT; wherein,
the ONU is used for reporting at least one of the current used wavelength of the ONU, the wavelength tuning range of the ONU and the time required by the wavelength tuning of the ONU to the OLT in the wavelength tuning stage of the ONU;
and the OLT is used for allocating wavelength to the ONU according to the information reported by the ONU.
7. The system of claim 6, wherein the ONU is further configured to, if the OLT allocates a bandwidth for reporting the serial number information to the ONU, reply at least two information of the serial number information of the ONU, a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU to the OLT.
8. The system of claim 6, wherein the ONU is further configured to, if the OLT allocates a bandwidth for reporting the registration information to the ONU, reply the OLT with at least two information selected from the registration information of the ONU, a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU.
9. The system of claim 6, wherein the ONU is further configured to reply to the OLT with information including at least one of a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU if the OLT queries the wavelength tuning capability of the ONU.
10. The system according to claim 6, wherein the ONU is further configured to implement the state machine migration after receiving a wavelength assignment command sent by the OLT by any one of the following manners:
the first method is as follows: before the ONU tunes the wavelength, the ONU is in a state Ox, the ONU tunes the wavelength from the moment the ONU receives a command of distributing the wavelength, the ONU finishes tuning the wavelength and obtains the downlink frame synchronization again, and the ONU is kept in the state Ox all the time;
the second method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to an intermittent downlink synchronization loss state, and when the ONU finishes tuning the wavelength and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state;
the third method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to a wavelength tuning state, and when the ONU finishes wavelength tuning and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state.
11. A wavelength tuning device in a passive optical network, characterized in that the device is located at an optical network unit, ONU;
the equipment is used for reporting at least one of the current used wavelength of the ONU, the wavelength tuning range of the ONU and the time required by the wavelength tuning of the ONU to the OLT in the wavelength tuning stage of the ONU.
12. The apparatus of claim 11, wherein the apparatus is further configured to, if the OLT allocates a bandwidth for reporting the serial number information to the ONU, reply to the OLT with at least two information of the serial number information of the ONU, a wavelength currently used by the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU.
13. The apparatus according to claim 11, wherein the apparatus is further configured to, if the OLT allocates a bandwidth for reporting the registration information to the ONU, reply to the OLT with at least two information of the registration information of the ONU, a currently used wavelength of the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU.
14. The apparatus of claim 11, wherein the apparatus is further configured to reply to the OLT with information including at least one of a wavelength currently used by the ONU, a wavelength tuning range of the ONU, and a time required for wavelength tuning of the ONU, if the OLT queries the wavelength tuning capability of the ONU.
15. The apparatus according to claim 11, wherein the apparatus is further configured to implement the state machine migration after receiving a wavelength assignment command sent by the OLT, in any one of the following manners:
the first method is as follows: before the ONU tunes the wavelength, the ONU is in a state Ox, the ONU tunes the wavelength from the moment the ONU receives a command of distributing the wavelength, the ONU finishes tuning the wavelength and obtains the downlink frame synchronization again, and the ONU is kept in the state Ox all the time;
the second method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to an intermittent downlink synchronization loss state, and when the ONU finishes tuning the wavelength and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state;
the third method comprises the following steps: before the ONU tunes the wavelength, the ONU tunes the wavelength and shifts to a wavelength tuning state, and when the ONU finishes wavelength tuning and obtains downlink synchronization again, the ONU shifts back to the state Ox or the ONU shifts back to a ranging state.
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