CN105577265A

CN105577265A - Calibration method for uplink wavelength channel of PON (Passive Optical Network) system and ONU (Optical Network Unit)

Info

Publication number: CN105577265A
Application number: CN201410555256.9A
Authority: CN
Inventors: 耿丹; 张德智; 张伟良
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2014-10-17
Filing date: 2014-10-17
Publication date: 2016-05-11
Anticipated expiration: 2034-10-17
Also published as: CN105577265B

Abstract

The invention discloses a calibration method for uplink wavelength channels of PON and an ONU. The calibration method comprises that the ONU calibrates the uplink wavelength channels according to the sequence of the uplink wavelength channels and/or the sequence of related values of the uplink wavelength channels, and uplink wavelength channels and/or related values thereof are ordered from high to low or from low to high to form the sequence. Thus, the uplink wavelength is calibrated.

Description

The calibration steps of the upgoing wave long-channel of passive optical network and optical network unit

Technical field

The present invention relates to the communications field, in particular to calibration steps and the optical network unit of the upgoing wave long-channel of a kind of EPON (PassiveOpticalNetwork, referred to as PON) system.

Background technology

Along with the development of network technology, the business such as voice, data, video that Internet Transmission can be utilized a large amount of, therefore improve constantly the requirement of bandwidth, PON produces under this demand.The topological structure of PON system as shown in Figure 1, PON system is usually by the optical line terminal (OpticalLineTerminal of office side, referred to as OLT), the optical network unit (OpticalNetworkUnit of user side, referred to as ONU) and Optical Distribution Network (OpticalDistributionNetwork, referred to as ODN) composition, usually adopt point-to-multipoint network configuration.ODN is made up of monomode fiber and the Passive Optical Components such as optical splitter, optical connector, for the physical connection between OLT and ONU provides light-transmitting medium.In order to promote the bandwidth of network further, multichannel wavelength is transmitted in trunk optical fiber, Bing Mei road wavelength recycles the PON system that time division technique provides access, is called as time-division wavelength division multiplexing (TimewavelengthDivisionMultiplexing is called for short TWDM) PON system.

The topological structure of TWDMPON system as shown in Figure 2, multiple TWDM channel end (ChannelTermination is had in TWDMPONOLT, be called for short CT), the up-downgoing wavelength channel (composition TWDMChannel) that each TWDMCT process is associated together for a pair, and access and maintenance service for all ONU be operated in this pair wavelength channel provide.ONU transmits data by time-multiplexed mode in this pair wavelength channel.The up-downgoing wavelength channel of different TWDMCT process is all not identical.Each ONU sends upstream data according to the instruction of OLTCT in specific ascending time slot.

In order to realize load balancing, energy-conservation and reduce the reason such as stock group of ONU, ONU in TWDMPON system is colourless, the reflector of that is all ONU and receiver are being all physically identical, and transmission wavelength and the reception wavelength of ONU are then arranged to tunable.ONU by the operation wavelength of tuning device, thus can be operated in the up-downgoing wavelength channel of arbitrary OLTCT.Because in heterogeneous networks, the wavelength value of OLTCT is not fixed, be therefore unitized ONU device, reduce the cost of ONU, ONU does not arrange fixing operation wavelength, does not carry out wavelength calibration with regard to saying yet.For when ensureing that ONU works in real network can accurately be tuned to up wavelength in TWDM passage corresponding to each CT of OLT and downstream wavelength work, when ONU is connected to PON system, ONU needs to complete wavelength calibration work under the assistance of OLTCT.This process is called as on-line calibration.The process of on-line calibration is wherein had for downstream wavelength and up wavelength.

Due in ONU up wavelength on-line calibration process, ONU mainly by regulating transmitter, in its tunable scope, each wavelength location sends corresponding detectable signal, and attempts the feedback obtaining OLTCT.Determine that whether the current wavelength position of emission detection signal is the upgoing wave long-channel of some OLTCT with this.If obtain the feedback of OLTCT, then can record, complete the up wavelength calibration of this OLTCT.If complete the up wavelength calibration of all OLTCT, then need repetition said process repeatedly, until complete.In the evolution of technology, for the different launching techniques of ONU detectable signal, develop two kinds of technology.

First method to utilize in XGPON ONU to register in state of activation machine static window in O3 state, and in this static window, the ONU of normal work can not send upstream data within the time period of static window.Thus detectable signal under the prerequisite not disturbing existing normal ONU, can send detectable signal, also avoids detectable signal to be submerged in data transfer signal.Because ONU is when emission detection signal, the up wavelength of its which OLTCT belonging cannot be determined, therefore in order to avoid the transfer of data for all OLTCT affects, all CT of OLT need the static window of the open equal length of Complete Synchronization, launch upstream data to complete the upstream data of wavelength calibration ONU interference to other when can avoid the up wavelength calibration of ONU like this at any data feedback channel.The method does not have extra requirement for the device capabilities of ONU, but high requirement is proposed for the different CT of OLT: one is when all TWDM synchronously open quiet window, whole TWDMPON system can not send uplink business data, the efficiency of transmission of upstream data can be affected, and synchronously open quiet window at all TWDM and also require that all TWDM passages realize strict time synchronized, time synchronized adds the complexity of system, and adds the probability occurring abnormal ONU.Also have a shortcoming to be if when different OLTCT is subordinated to different operators in addition, in fact operation easier is very high to link up Bandwidth Allocation Policy between different operators.

Second method is that the low frequency part modulation be arranged in by detectable signal in same wavelength points sends low speed detectable signal, thus avoids intermediate frequency and the HFS of data transmission, also just indirectly avoids the shortcoming using static window.But second method also brings larger shortcoming, mainly in PON, in order to make detectable signal not cause crosstalk to data-signal, the transmitted power of detectable signal is pressed very low, thus raised the ability of OLT receiver greatly, be technically difficult to realize and suitability for industrialized production.And if ONU utilizes low frequency to send data, then need additionally to add low frequency filtering, and modulation device, cost also can increase.

Described on comprehensive, two methods, all while the up wavelength on-line calibration problem of solution, introduce the new problem being difficult to solve or overcome.Can on the basis of above-mentioned two kinds of methods, propose a kind of newly or the method for improvement, both solved up wavelength on-line calibration problem, again can the cost of less new introducing or complexity, be the problem that industry is being studied.

Summary of the invention

For the problem of the up wavelength on-line calibration of ONU in PON system, the invention provides a kind of calibration steps and optical network unit of upgoing wave long-channel of PON system, at least to solve the problem.

According to an aspect of the present invention, provide a kind of calibration steps of up wavelength of PON system, comprise: optical network unit ONU is according to the order of the correlation of upgoing wave long-channel and/or upgoing wave long-channel, described upgoing wave long-channel is calibrated, wherein, described order is the correlation sequence from big to small or from small to large according to upgoing wave long-channel and/or upgoing wave long-channel.

Preferably, ONU is according to the order of the correlation of upgoing wave long-channel and/or upgoing wave long-channel, described upgoing wave long-channel is calibrated, comprise: described ONU obtains at least one first signal in described PON system at least one TWDM passage, wherein, described first signal is by the order of the correlation instruction upgoing wave long-channel of the upgoing wave long value of TWDM passage that carries and/or upgoing wave long-channel; Described ONU calibrates according to the selective sequential upgoing wave long-channel of described upgoing wave long-channel.

Preferably, described ONU calibrates described upgoing wave long-channel, comprising: described ONU determines the original position to selecting the upgoing wave long-channel obtained to calibrate; Described ONU calibrates the upgoing wave long-channel that described selection obtains from described original position.

Preferably, described ONU determines that the upgoing wave long-channel selecting to obtain carries out the original position of calibrating, comprise one of following: when ONU does not exist calibrated upgoing wave long-channel, described ONU selects the maximum wavelength in the tuning range self supported or minimum wavelength as described original position; When ONU exists calibrated upgoing wave long-channel, described ONU determines described original position according to calibrated upgoing wave long-channel.

Preferably, described ONU calibrates described upgoing wave long-channel, comprising: described ONU obtains the resource information that can be used in the TWDM passage of upgoing wave long-channel place calibrating; Described ONU, from the original position determined, sends secondary signal based on described resource information; Described ONU calibrates according to the response whether receiving described secondary signal the upgoing wave long-channel that described selection obtains.

Preferably, described ONU calibrates according to the response whether receiving described secondary signal the upgoing wave long-channel that described selection obtains, comprise one of following: when not receiving described response on a preset condition based, described ONU sends the wavelength of described secondary signal according to default step-length adjustment, and wavelength location after the adjustment sends described secondary signal based on described resource information; When described pre-conditioned under receive described response time, the wavelength location sending described secondary signal is recorded as the calibration information of described upgoing wave long-channel by described ONU, and adjusts wavelength location according to default step-length and send described secondary signal based on described resource information; When after the signal receiving the instruction conflict that TWDM channel end sends, ONU again sends described secondary signal based on described resource information in existing wavelength location.

Preferably, also comprise: described ONU suspends after receiving the order of TWDM passage transmission or continues wavelength calibration.

Preferably, described ONU sends the wavelength of described secondary signal according to the adjustment of default step-length, at least comprises one of following: if original position is greater than current calibrated wavelength, described in be adjusted to increase wavelength; If original position is less than described current calibrated wavelength, described in be adjusted to reduction wavelength; Original position be described ONU select in the tuning range self supported maximum wavelength time, described in be adjusted to reduction wavelength; Original position be described ONU select in the tuning range self supported minimum wavelength time, described in be adjusted to increase wavelength.

Preferably, also comprise: described ONU, after record calibration information, adjusts wavelength location according to default step-length and sends described secondary signal based on described resource information.

Preferably, also comprise: up transmission wavelength location when receiving described response is for the first time recorded as the minimum wavelength value of described up wavelength by described ONU; The up transmission wavelength location of the response correspondence received for the last time is recorded as the maximum wavelength value of described up wavelength by described ONU.

Preferably, also comprise: determine to receive described response to during receiving described response for the last time from first time, the received power indicated in described response up wavelength location that is maximum or optimum position is the intermediate wave long value of described up wavelength.

Preferably, describedly pre-conditionedly to comprise: the scheduled time and/or predetermined number of retransmissions; Wherein, if do not receive the response of described secondary signal in the scheduled time after sending described secondary signal, then determine not receive described response; If or do not receive described response within the described scheduled time, would then retransmit described secondary signal, until receive described response or sending times is greater than described predetermined number of retransmissions.

Preferably, the information that described response is carried comprise following one of at least: current upgoing wave long-channel mark, send mark, current upgoing wave long value, the received power information of described secondary signal, the received power change information of described secondary signal of the TWDM passage of response.

Preferably, according to calibrated upgoing wave long-channel, described ONU determines that described original position comprises: described ONU is according to the up wavelength location of the best of calibrating upgoing wave long-channel, and the spacing value between upgoing wave long-channel, determine the original position of current alignment upgoing wave long-channel; Wherein, when having calibrated upgoing wave long-channel described in being greater than from original position, mobile for increase up wavelength according to described spacing value; Calibrated upgoing wave long-channel constantly described in being less than when original position, described movement is for reduce up wavelength according to described spacing value.

According to another aspect of the present invention, additionally provide a kind of calibration steps of up wavelength of passive optical network PON system, described method comprises: optical line terminal OLT sends at least one first signal on time-division wavelength division multiplexing TWDM passage, wherein, described first signal indicates the order of upper wavelength channel by the upgoing wave long-channel of described TWDM passage that carries and/or upgoing wave long-channel correlation, wherein, described order is according to wavelength and/or the sequence from big to small or from small to large of upgoing wave long-channel correlation.

Preferably, described optical line terminal OLT sends the ascending resource information being used for the calibration of upgoing wave long-channel on TWDM passage.

Preferably, also comprise: described OLT receives the secondary signal for the calibration of upgoing wave long-channel that at least one ONU sends, and wherein, described secondary signal carries mark or the relevant information of the ONU sending described secondary signal; Described OLT sends the response of described secondary signal at least one ONU described, wherein, the information of carrying in described response comprise following one of at least: current upgoing wave long-channel mark, current TWDM gap marker, current upgoing wave long-channel wavelength value, the received power information of receiver, the received power change information of receiver.

Preferably, also comprise: after described OLT detects the secondary signal of conflict in an ascending resource calibrated for upgoing wave long-channel, OLT notifies that described ONU detects the 3rd signal of conflict.

Preferably, also comprise: described OLT is after receiving described secondary signal, and what increase described ascending resource arranges frequency; And/or described OLT is not after receiving described secondary signal, the described ascending resource that slows down frequency is set.

According to another aspect of the present invention, provide a kind of optical network unit ONU, comprise: calibrating installation, for the order of the correlation according to upgoing wave long-channel and/or upgoing wave long-channel, described upgoing wave long-channel is calibrated, wherein, described order is the correlation sequence from big to small or from small to large according to upgoing wave long-channel and/or upgoing wave long-channel.

Preferably, described calibrating installation, comprise: acquisition module, for obtaining at least one first signal in PON system at least one TWDM passage, wherein, described first signal is by the order of the correlation instruction upgoing wave long-channel of the upgoing wave long value of TWDM passage that carries and/or upgoing wave long-channel; Calibration module, calibrates for the selective sequential upgoing wave long-channel according to described upgoing wave long-channel.

Preferably, described calibration module, comprising: determining unit, for determining the original position to selecting the upgoing wave long-channel obtained to calibrate; Alignment unit, for calibrating the upgoing wave long-channel that described selection obtains from described original position.

Preferably, described determining unit, determine that the original position to selecting the upgoing wave long-channel obtained to calibrate comprises with next: when there is not calibrated upgoing wave long-channel, the maximum wavelength in the tuning range selecting self to support or minimum wavelength are as described original position; When there is calibrated upgoing wave long-channel, determine described original position according to calibrated upgoing wave long-channel.

According to another aspect of the present invention, also be supplied to a kind of optical line terminal OLT, comprise: the first sending module, for sending at least one first signal on time-division wavelength division multiplexing TWDM passage, wherein, described first signal indicates the order of upper wavelength channel by the upgoing wave long-channel of described TWDM passage that carries and/or upgoing wave long-channel correlation, and wherein, described order is according to wavelength and/or the sequence from big to small or from small to large of upgoing wave long-channel correlation.

Preferably, described first sending module, also for sending the ascending resource information being used for the calibration of upgoing wave long-channel on TWDM passage.

Preferably, also comprise: receiver module, for receiving the secondary signal for the calibration of upgoing wave long-channel that at least one ONU sends, wherein, described secondary signal carries mark or the relevant information of the ONU sending described secondary signal; Second sending module, for sending the response of described secondary signal at least one ONU described, wherein, the information of carrying in described response comprise following one of at least: current upgoing wave long-channel mark, current TWDM gap marker, current upgoing wave long-channel wavelength value, the received power information of receiver, the received power change information of receiver.

Preferably, also comprise: notification module, for one for upgoing wave long-channel calibration ascending resource in the secondary signal of conflict detected after, OLT notifies that described ONU detects the 3rd signal of conflict.

Preferably, also comprise: increase module, for after receiving described secondary signal, what increase described ascending resource arranges frequency; And/or minimizing module, for after not receiving described secondary signal, the described ascending resource that slows down frequency is set.

Pass through the present invention, ONU carries out up wavelength calibration according to the order of up wavelength and/or upgoing wave long correlation value scope, can improve, the uplink efficiency of PON system, reduce the precision of the clock synchronous between all TWDM to OLT in TWDMPON system, passage, reduce the complexity of OLT, improve network service quality.

Accompanying drawing explanation

Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is the structure chart of the PON system according to correlation technique;

Fig. 2 is the topology diagram of the TWDMPON system according to correlation technique;

Fig. 3 is the flow chart one of the calibration steps of the upgoing wave long-channel of PON system according to the embodiment of the present invention;

Fig. 4 is the structured flowchart of the optical network unit ONU according to the embodiment of the present invention;

Fig. 5 is the flowchart 2 of the calibration steps of the upgoing wave long-channel of PON system according to the embodiment of the present invention;

Fig. 6 is the structured flowchart of the optical line terminal OLT according to the embodiment of the present invention;

Fig. 7 is the schematic flow sheet one of the up method for wavelength calibration of the PON of the preferred embodiment of the present invention;

Fig. 8 is the schematic flow sheet two of the up method for wavelength calibration of the PON of the preferred embodiment of the present invention;

Fig. 9 is the schematic flow sheet three of the up method for wavelength calibration of the PON of the preferred embodiment of the present invention; And

Figure 10 is the schematic flow sheet four of the up method for wavelength calibration of the PON of the preferred embodiment of the present invention.

Embodiment

Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.

In the examples below, see the system architecture shown in Fig. 1 and Fig. 2, but be not limited thereto.Can be expected that following examples can be realized by computer program element, computer program element can store in memory, performs computer program element by processor.

Embodiments provide a kind of calibration steps of up wavelength of PON system, wherein, above-mentioned PON system comprises multiple TWDM passage, each TWDM has up wave-length coverage and downstream wavelength scope, the up wave-length coverage of above-mentioned each TWDM passage is different, and one or more ONU is used in the up wave-length coverage of above-mentioned each TWDM passage to carrying out uplink.

Fig. 3 is the flow chart one of the calibration steps of the upgoing wave long-channel of PON system according to the embodiment of the present invention, as shown in Figure 3, and the method comprising the steps of S302:

Step S302, optical network unit ONU is according to the order of the correlation of upgoing wave long-channel and/or upgoing wave long-channel, calibrate upgoing wave long-channel, wherein, order is the correlation sequence from big to small or from small to large according to upgoing wave long-channel and/or upgoing wave long-channel.

In an execution mode of the embodiment of the present invention, in above-mentioned steps S302, above-mentioned ONU can monitor at least one first signal in above-mentioned multiple TWDM passage at least one TWDM passage, wherein, the first signal is by the order of the correlation instruction upgoing wave long-channel of the upgoing wave long value of TWDM passage that carries and/or upgoing wave long-channel; ONU calibrates according to the selective sequential upgoing wave long-channel of upgoing wave long-channel.

In an execution mode of the embodiment of the present invention, ONU carries out calibration to upgoing wave long-channel and can comprise:

Steps A, ONU determines the original position to selecting the upgoing wave long-channel obtained to calibrate;

Step B, ONU calibrate the upgoing wave long-channel that selection obtains from original position.

Wherein, ONU determines that the upgoing wave long-channel selecting to obtain carries out the original position of calibrating, comprise one of following: when ONU does not exist calibrated upgoing wave long-channel, ONU selects maximum wavelength in the tuning range self supported or minimum wavelength as original position; When ONU exists calibrated upgoing wave long-channel, ONU is according to calibrated upgoing wave long-channel determination original position.

Step C, ONU obtain the resource information that can be used in the TWDM passage of upgoing wave long-channel place calibrating;

Step D, ONU, from the original position determined, send secondary signal based on resource information;

Step e, ONU selects the upgoing wave long-channel obtained according to the response calibration whether receiving secondary signal.

Wherein, ONU selects the upgoing wave long-channel obtained according to the response calibration whether receiving secondary signal, comprise one of following: when not receiving response on a preset condition based, ONU sends the wavelength of secondary signal according to default step-length adjustment, and wavelength location after the adjustment sends secondary signal based on resource information; When receiving response on a preset condition based, the wavelength location sending secondary signal is recorded as the calibration information of upgoing wave long-channel by ONU, and according to default step-length adjustment wavelength location and based on resource information transmission secondary signal; When after the signal receiving the instruction conflict that TWDM channel end sends, ONU again sends secondary signal based on resource information in existing wavelength location.

In an execution mode of the embodiment of the present invention, ONU suspends after receiving the order of TWDM passage transmission or continues wavelength calibration.

ONU sends the wavelength of secondary signal according to the adjustment of default step-length, at least comprises one of following: if original position is greater than current calibrated wavelength, be adjusted to increase wavelength; If original position is less than current calibrated wavelength, be adjusted to reduction wavelength; Original position be ONU select in the tuning range self supported maximum wavelength time, be adjusted to reduction wavelength; Original position be ONU select in the tuning range self supported minimum wavelength time, be adjusted to increase wavelength.

In an execution mode of the embodiment of the present invention, ONU, after record calibration information, adjusts wavelength location according to default step-length and sends secondary signal based on resource information.

Preferably, up transmission wavelength location when receiving response is for the first time recorded as the minimum wavelength value of up wavelength by ONU; The up transmission wavelength location of the response correspondence received for the last time is recorded as the maximum wavelength value of up wavelength by ONU.

Preferably, determine to receive response to during receiving response for the last time from first time, the received power indicated in response up wavelength location that is maximum or optimum position is the intermediate wave long value of up wavelength.

It should be noted that, pre-conditionedly to comprise: the scheduled time and/or predetermined number of retransmissions; Wherein, if do not receive the response of secondary signal in the scheduled time after sending secondary signal, then determine not receive response; If or do not receive response in the given time, then retransmit secondary signal, until receive response or sending times be greater than predetermined number of retransmissions.

Preferably, respond the information of carrying comprise following one of at least: current upgoing wave long-channel mark, send mark, current upgoing wave long value, the received power information of secondary signal, the received power change information of secondary signal of the TWDM passage of response.

Preferably, ONU comprises according to calibrated upgoing wave long-channel determination original position: ONU is according to the up wavelength location of the best of calibrating upgoing wave long-channel, and the spacing value between upgoing wave long-channel, determine the original position of current alignment upgoing wave long-channel; Wherein, when be greater than from original position calibrate upgoing wave long-channel time, mobile for increase up wavelength according to spacing value; Upgoing wave long-channel is calibrated constantly when original position is less than, mobile for reduce up wavelength according to spacing value.

The embodiment of the present invention additionally provides a kind of optical network unit ONU, wherein, be arranged in PON system, above-mentioned PON system comprises multiple TWDM passage, each TWDM has up wave-length coverage and downstream wavelength scope, the up wave-length coverage of above-mentioned each TWDM passage is different, and one or more ONU is used in the up wave-length coverage of above-mentioned each TWDM passage to carrying out uplink.

Fig. 4 is the structured flowchart of the optical network unit ONU according to the embodiment of the present invention, as shown in Figure 4, this ONU comprises: calibrating installation 42, for the order of the correlation according to upgoing wave long-channel and/or upgoing wave long-channel, upgoing wave long-channel is calibrated, wherein, order is the correlation sequence from big to small or from small to large according to upgoing wave long-channel and/or upgoing wave long-channel.

In an execution mode of the embodiment of the present invention, this calibrating installation 42, comprising:

Acquisition module, for obtaining at least one first signal in PON system at least one TWDM passage, wherein, the first signal is by the order of the correlation instruction upgoing wave long-channel of the upgoing wave long value of TWDM passage that carries and/or upgoing wave long-channel;

Calibration module, for calibrating according to the selective sequential upgoing wave long-channel of upgoing wave long-channel.

Wherein, calibration module, comprising: determining unit, for determining the original position to selecting the upgoing wave long-channel obtained to calibrate; Alignment unit, for calibrating the upgoing wave long-channel that selection obtains from original position.

Determining unit, determine to comprise the original position selecting the upgoing wave long-channel that obtains to calibrate one of following:

When there is not calibrated upgoing wave long-channel, the maximum wavelength in the tuning range selecting self to support or minimum wavelength are as original position;

When there is calibrated upgoing wave long-channel, according to calibrated upgoing wave long-channel determination original position.

In an execution mode of the embodiment of the present invention, above-mentioned calibration module, for performing following process:

(1) from the wavelength that the current calibrated wavelength of above-mentioned current unregulated wavelength middle distance is nearest, utilize the transmission of the ascending resource of the TWDM of above-mentioned selection for the secondary signal of up wavelength calibration;

(2) response receiving above-mentioned secondary signal is judged whether;

(3) when receiving above-mentioned response in predefined conditions, the wavelength sending above-mentioned secondary signal is recorded as the wavelength of the TWDM passage of above-mentioned selection, and the wavelength of above-mentioned secondary signal is sent according to default step-length adjustment, wavelength after the adjustment utilize the ascending resource of the TWDM of above-mentioned selection send above-mentioned secondary signal;

(4) when above-mentioned pre-conditioned under do not receive above-mentioned response time, send the wavelength of above-mentioned secondary signal according to above-mentioned default step-length adjustment, wavelength after the adjustment utilize the ascending resource of the TWDM of above-mentioned selection send above-mentioned secondary signal.

Further, said apparatus can also comprise: determination module, receive above-mentioned response to during receiving above-mentioned response for the last time for determining from first time, the maximum wavelength of the received power indicated in above-mentioned response is the middle wavelength of the TWDM passage of above-mentioned selection.

For other parts identical with said method, see the description of above-mentioned shown method, do not repeat them here.

Corresponding with said method and ONU, the embodiment of the present invention additionally provides a kind of calibration steps of up wavelength of PON system, wherein, above-mentioned PON system comprises multiple TWDM passage, each TWDM has up wave-length coverage and downstream wavelength scope, the up wave-length coverage of above-mentioned each TWDM passage is different, and one or more ONU is used in the up wave-length coverage of above-mentioned each TWDM passage to carrying out uplink.

Fig. 5 is the flowchart 2 of the calibration steps of the upgoing wave long-channel of PON system according to the embodiment of the present invention, as shown in Figure 4, and the method comprising the steps of S502:

Step S502: optical line terminal OLT sends at least one first signal on time-division wavelength division multiplexing TWDM passage, wherein, first signal indicates the order of upper wavelength channel by the upgoing wave long-channel of TWDM passage that carries and/or upgoing wave long-channel correlation, wherein, order is according to wavelength and/or the sequence from big to small or from small to large of upgoing wave long-channel correlation.

Alternatively, optical line terminal OLT sends the ascending resource information being used for the calibration of upgoing wave long-channel on TWDM passage.

In another execution mode of this embodiment of the present invention, the method can also comprise:

Step F: OLT receives the secondary signal for the calibration of upgoing wave long-channel that at least one ONU sends, and wherein, secondary signal carries mark or the relevant information of the ONU sending secondary signal;

Step G:OLT sends the response of secondary signal at least one ONU, wherein, the information of carrying in response comprise following one of at least: current upgoing wave long-channel mark, current TWDM gap marker, current upgoing wave long-channel wavelength value, the received power information of receiver, the received power change information of receiver.

After step H:OLT detects the secondary signal of conflict in an ascending resource calibrated for upgoing wave long-channel, OLT notifies that ONU detects the 3rd signal of conflict

Step I:OLT is after receiving secondary signal, and what increase ascending resource arranges frequency; And/or OLT is not after receiving secondary signal, the ascending resource that slows down frequency is set.

The embodiment of the present invention additionally provides a kind of OLT of up wavelength of PON system, wherein, PON system comprises multiple time-division wavelength division multiplexing TWDM passage, each TWDM has up wave-length coverage and downstream wavelength scope, the up wave-length coverage of above-mentioned each TWDM passage is different, and one or more ONU is used in the up wave-length coverage of above-mentioned each TWDM passage to carrying out uplink.

Fig. 6 is the structured flowchart of the optical line terminal OLT according to the embodiment of the present invention, as shown in Figure 6, this OLT can comprise: the first sending module 62, for sending at least one first signal on time-division wavelength division multiplexing TWDM passage, wherein, first signal indicates the order of upper wavelength channel by the upgoing wave long-channel of TWDM passage that carries and/or upgoing wave long-channel correlation, and wherein, order is according to wavelength and/or the sequence from big to small or from small to large of upgoing wave long-channel correlation.

In embodiments of the present invention, the first sending module, also for sending the ascending resource information being used for the calibration of upgoing wave long-channel on TWDM passage.

In an execution mode of the embodiment of the present invention, can also comprise:

Receiver module, for receiving the secondary signal for the calibration of upgoing wave long-channel that at least one ONU sends, wherein, secondary signal carries mark or the relevant information of the ONU sending secondary signal;

Second sending module, for sending the response of secondary signal at least one ONU, wherein, the information of carrying in response comprise following one of at least: current upgoing wave long-channel mark, current TWDM gap marker, current upgoing wave long-channel wavelength value, the received power information of receiver, the received power change information of receiver;

Notification module, for the secondary signal of conflict detected in an ascending resource for the calibration of upgoing wave long-channel after, OLT notifies that ONU detects the 3rd signal of conflict;

Increase module, for after receiving secondary signal, what increase ascending resource arranges frequency; And/or minimizing module, for after not receiving secondary signal, the ascending resource that slows down frequency is set.

For other parts identical with said method, see the description to the method shown in Fig. 5, do not repeat them here.

Pass through the embodiment of the present invention, ONU carries out up wavelength calibration according to the order of up wave-length coverage, can improve, the uplink efficiency of PON system, reduce the precision of the clock synchronous between all TWDM to OLT in TWDMPON system, passage, reduce the complexity of OLT, improve network service quality.

For the ease of understanding the embodiment of the present invention, for example, the embodiment of the present invention is described with various embodiments below.In embodiments of the present invention, when not conflicting, each execution mode of the embodiment of the present invention can be in conjunction with.

In following execution mode, " static window ", as an example of " ascending resource " of the embodiment of the present invention, is described and illustrates.

Execution mode one

Multiple TWDM passage is had, the corresponding TWDM channel end of each TWDM passage and one group of ONU, the corresponding downstream wavelength passage of each TWDM passage, one or more upgoing wave long-channel corresponding in TWDMPON system.The corresponding different downstream wavelength passage of different TWDM passages and different upgoing wave long-channels.The OLT order each ONU be connected in PON system is operated on some TWDM passages, ONU use corresponding above-mentioned TWDM passage downstream wavelength channel reception downlink data, and use corresponding above-mentioned TWDM passage upgoing wave long-channel send upstream data.After ONU energising, if ONU does not have downstream wavelength calibration record, ONU from low to high, or oneself reception wavelength tuning from high to low, if ONU receives downstream signal, ONU stores the corresponding relation between the tuner parameters of the reception wavelength of oneself and down going wave long value or current TWDM passage or current downlink wavelength mark, completes the calibration of current downlink wavelength.After ONU completes the calibration of all downstream wavelength, ONU starts the calibration of upgoing wave long-channel.Following committed step is adopted to carry out the up wavelength calibration of ONU between OLT and ONU.TWDM gap marker is directly proportional to upgoing wave long value, and up wavelength mark is directly proportional to upgoing wave long value.

Fig. 7 is the schematic flow sheet one of the up method for wavelength calibration of the PON of the preferred embodiment of the present invention, as shown in Figure 7, comprises step S702 to step S712.

When step S702:OLT is used for the quiet window of up wavelength calibration to ONU is open on some or all of TWDM passage, in the upstream bandwidth of the quiet window of correspondence distributes, carry one of at least following passage relevant information: current up wavelength mark, current TWDM gap marker, current upgoing wave long value.

Step S704: if ONU does not complete the up wavelength calibration of this passage, ONU be according to oneself can tuning wave-length coverage from minimal wave length to most long wavelength direction one by one wavelength channel calibrate, determine whether that completing all TWDM passage relevant information values is less than the above-mentioned up wavelength calibration not completing TWDM passage corresponding to wavelength calibration TWDM passage relevant information value, if completed, perform step S706, if do not completed, perform step S708.

Step S706:ONU sends calibrating signal in the quiet window corresponding for the upstream bandwidth of wavelength calibration that above-mentioned OLT sends, and performs step S710 afterwards.

Step S708:ONU does not respond the upstream bandwidth for wavelength calibration that above-mentioned OLT sends, return and continue to perform step S704, allly completed all TWDM passage relevant information values until complete and be less than the above-mentioned up wavelength calibration not completing TWDM passage corresponding to wavelength calibration TWDM passage relevant information value.

In a preferred embodiment of the invention, the minimal wave length place of ONU in wave-length coverage that oneself can be tuning starts to send calibrating signal, after ONU sends wavelength calibration signal, if do not receive the reply of OLT, the upstream bandwidth for wavelength calibration that then ONU sends at the OLT receiving this passage distributes follow-up supervention and send calibrating signal, if after ONU sends N calibrating signal on this up wavelength, do not receive the reply of OLT, ONU oneself emission wavelength tuning is to longer wavelength corresponding to next step-length, and distribute follow-up supervention give calibrating signal at the upstream bandwidth for wavelength calibration that the OLT receiving this passage sends.

Step S710: one of at least following data feedback channel relevant information is sent to ONU: current up wavelength mark, current TWDM gap marker, current upgoing wave long value.

Step S712:ONU stores the corresponding relation between the tuner parameters of the transmission wavelength of oneself and upgoing wave long value or current TWDM passage or current up wavelength mark, completes the calibration of current up wavelength.

Preferably, after ONU completes the up wavelength calibration of first TWDM passage according to above-mentioned steps, when after the allocated bandwidth receiving the up wavelength calibration on second TWDM passage, ONU by the emission wavelength of oneself be tuned to be greater than wavelength value corresponding to a step-length of upgoing wave long value corresponding to first TWDM passage after send up calibrating signal, carry out the up wavelength calibration of second TWDM passage, OLT and ONU repeats above-mentioned steps, and ONU completes the up wavelength calibration of all data feedback channels.

In embodiments of the present invention, preferably, ONU according to oneself can tuning wave-length coverage from minimal wave length, to most long wavelength direction, TWDM passage is calibrated one by one time, when ONU completes calibration at the TWDM passage that short wavelength is corresponding, TWDM channel end corresponding to short wavelength notifies that the TWDM channel end that adjacent long wavelength's passage is corresponding has ONU to need to calibrate.

In embodiments of the present invention, preferably, when having the TWDM passage newly increased to need ONU to carry out wavelength calibration in TWDMPON system, ONU carries out wavelength tuning towards the wavelength direction of the TWDM passage newly increased from the boundary value of wavelength value scope corresponding to the adjacency channel of the TWDM passage newly increased, and sends calibrating signal and carry out wavelength calibration.

Preferably, the step value of the tuning up wavelength of ONU can be the value that the 1/N at TWDM data feedback channel interval is corresponding.

Execution mode two

Fig. 8 is the schematic flow sheet two of the up method for wavelength calibration of the PON of the preferred embodiment of the present invention, as shown in Figure 8, comprises step S802 to step S812.

When step S802:OLT is used for the quiet window of up wavelength calibration to ONU is open on some or all of TWDM passage, in the upstream bandwidth of the quiet window of correspondence distributes, carry one of at least following passage relevant information: current up wavelength mark, current TWDM gap marker, current upgoing wave long value.

Preferably, this upstream bandwidth also carries one of at least following content in distributing: all up wavelength marks, all TWDM gap markers, all upgoing wave long values.

After step S804:ONU receives the distribution of the upstream bandwidth for wavelength calibration of OLT transmission, if ONU does not complete the up wavelength calibration of this passage, ONU be according to oneself can tuning wave-length coverage from minimal wave length to most long wavelength direction one by one wavelength channel calibrate, determine whether that completing all TWDM passage relevant information values is less than the above-mentioned up wavelength calibration not completing TWDM passage corresponding to wavelength calibration TWDM passage relevant information value; If completed, perform step S806, if do not completed, perform step S808.

Step S806:ONU sends calibrating signal in the quiet window corresponding for the upstream bandwidth of wavelength calibration that above-mentioned OLT sends, and performs step S810 afterwards.

Step S808:ONU does not respond the upstream bandwidth for wavelength calibration that above-mentioned OLT sends, return and continue to perform step S804, allly completed all TWDM passage relevant information values until complete and be less than the above-mentioned up wavelength calibration not completing TWDM passage corresponding to wavelength calibration TWDM passage relevant information value.

In a preferred embodiment of the invention, preferably, the minimal wave length place of ONU in wave-length coverage that oneself can be tuning starts to send calibrating signal, after ONU sends wavelength calibration signal, if do not receive the reply of OLT, the upstream bandwidth for wavelength calibration that then ONU sends at the OLT receiving this passage distributes follow-up supervention and send calibrating signal, if after ONU sends N calibrating signal on this up wavelength, do not receive the reply of OLT, ONU oneself emission wavelength tuning is to longer wavelength, and distribute follow-up supervention give calibrating signal at the upstream bandwidth for wavelength calibration that the OLT receiving this passage sends.

Step S810: one of at least following data feedback channel relevant information is sent to ONU: current up wavelength mark, current TWDM gap marker, current upgoing wave long value.

Step S812:ONU stores the corresponding relation between the tuner parameters of the transmission wavelength of oneself and upgoing wave long value or current TWDM passage or current up wavelength mark, completes the calibration of current up wavelength.

In the present inventor's preferred embodiment, preferably, ONU according to oneself can tuning wave-length coverage from minimal wave length, to most long wavelength direction, TWDM passage is calibrated one by one time, when ONU completes calibration at the TWDM passage that short wavelength is corresponding, TWDM channel end corresponding to short wavelength notifies that the TWDM channel end that adjacent long wavelength's passage is corresponding has ONU to need to calibrate.

In a preferred embodiment of the invention, preferably, when having the TWDM passage newly increased to need ONU to carry out wavelength calibration in TWDMPON system, ONU carries out wavelength tuning towards the wavelength direction of the TWDM passage newly increased from the boundary value of wavelength value scope corresponding to the adjacency channel of the TWDM passage newly increased, and sends calibrating signal and carry out wavelength calibration.

In a preferred embodiment of the invention, preferably, the step value of the tuning up wavelength of ONU can be the value that the 1/N at TWDM data feedback channel interval is corresponding.

Execution mode three

Fig. 9 is the schematic flow sheet three of the up method for wavelength calibration of the PON of the preferred embodiment of the present invention, and as shown in Figure 9, this flow process comprises the following steps:

When step S902:OLT is used for the quiet window of up wavelength calibration to ONU is open on some or all of TWDM passage, in the upstream bandwidth of the quiet window of correspondence distributes, carry one of at least following passage relevant information: current up wavelength mark, current TWDM gap marker, current upgoing wave long value.

Preferably, upstream bandwidth also carries one of at least following content in distributing: all up wavelength marks, all TWDM gap markers, all upgoing wave long values.

After step S904:ONU receives the distribution of the upstream bandwidth for wavelength calibration of OLT transmission, if ONU does not complete the up wavelength calibration of this passage, and ONU be according to oneself can tuning wave-length coverage from most long wave grow to minimal wave length direction one by one wavelength channel calibrate, then determine whether that completing all TWDM passage relevant information values is greater than the above-mentioned up wavelength calibration not completing TWDM passage corresponding to wavelength calibration TWDM passage relevant information value; If completed, then perform step S906, if do not completed, perform step 908.

Step S906, ONU send calibrating signal in the quiet window corresponding for the upstream bandwidth of wavelength calibration that above-mentioned OLT sends, and perform step S910 afterwards.

Step S908, ONU does not respond the upstream bandwidth for wavelength calibration that above-mentioned OLT sends, return and continue to perform step S904, allly completed all TWDM passage relevant information values until complete and be less than the above-mentioned up wavelength calibration not completing TWDM passage corresponding to wavelength calibration TWDM passage relevant information value.

In a preferred embodiment of the invention, preferably ONU the most long wave strong point in tuning wave-length coverage can start to send calibrating signal at oneself, after ONU sends wavelength calibration signal, if do not receive the reply of OLT, the upstream bandwidth for wavelength calibration that then ONU sends at the OLT receiving this passage distributes follow-up supervention and send calibrating signal, if after ONU sends N calibrating signal on this up wavelength, do not receive the reply of OLT, ONU oneself emission wavelength tuning is to more short wavelength corresponding to next step-length, and distribute follow-up supervention give calibrating signal at the upstream bandwidth for wavelength calibration that the OLT receiving this passage sends.

Step S910: one of at least following data feedback channel relevant information is sent to ONU: current up wavelength mark, current TWDM gap marker, current upgoing wave long value.

Step S912:ONU stores the corresponding relation between the tuner parameters of the transmission wavelength of oneself and upgoing wave long value or current TWDM passage or current up wavelength mark, completes the calibration of current up wavelength.

ONU completes the up wavelength calibration of the TWDM passage of corresponding maximum upgoing wave long value according to above-mentioned steps after, when after the allocated bandwidth receiving the up wavelength calibration on adjacent above-mentioned TWDM passage, ONU by the emission wavelength of oneself be tuned to be less than wavelength value corresponding to a step-length of upgoing wave long value corresponding to above-mentioned TWDM passage after send up calibrating signal, carry out the up wavelength calibration of next TWDM passage, OLT and ONU repeats above-mentioned steps, and ONU completes the up wavelength calibration of all data feedback channels.

In the preferred embodiment, preferably, ONU according to oneself can tuning wave-length coverage from minimal wave length, to most long wavelength direction, TWDM passage is calibrated one by one time, when ONU completes calibration at the TWDM passage that short wavelength is corresponding, TWDM channel end corresponding to short wavelength notifies that the TWDM channel end that adjacent long wavelength's passage is corresponding has ONU to need to calibrate.

In the preferred embodiment, preferably, when having the TWDM passage newly increased to need ONU to carry out wavelength calibration in TWDMPON system, ONU carries out wavelength tuning towards the wavelength direction of the TWDM passage newly increased from the boundary value of wavelength value scope corresponding to the adjacency channel of the TWDM passage newly increased, and sends calibrating signal and carry out wavelength calibration.

Execution mode four

Figure 10 is the schematic flow sheet four of the up method for wavelength calibration of the PON of the preferred embodiment of the present invention, as shown in Figure 10, comprises step S1002 to step S1014.

When step S1002:OLT is used for the quiet window of up wavelength calibration to ONU is open on some or all of TWDM passage, in the upstream bandwidth of the quiet window of correspondence distributes, carry one of at least following passage relevant information: current up wavelength mark, current TWDM gap marker, current upgoing wave long value.

Preferably, upstream bandwidth can also carry one of at least following content in distributing: all up wavelength marks, all TWDM gap markers, all upgoing wave long values.

After step S1004:ONU receives the distribution of the upstream bandwidth for wavelength calibration of OLT transmission, if ONU does not complete the up wavelength calibration of this passage, and ONU be according to oneself can tuning wave-length coverage from minimal wave length to most long wavelength direction one by one wavelength channel calibrate, then determine whether that having completed all TWDM passage relevant information values is less than the above-mentioned up wavelength calibration not completing TWDM passage corresponding to wavelength calibration TWDM passage relevant information value, if completed, then perform step S1006, if do not completed, perform step 1008.

Step S1006:ONU sends calibrating signal in the quiet window corresponding for the upstream bandwidth of wavelength calibration that above-mentioned OLT sends, and performs step S1010 afterwards.

Step S1008:ONU does not respond the upstream bandwidth for wavelength calibration that above-mentioned OLT sends, return and continue to perform step S1004, allly completed all TWDM passage relevant information values until complete and be less than the above-mentioned up wavelength calibration not completing TWDM passage corresponding to wavelength calibration TWDM passage relevant information value.

Step S1010: judge whether upstream data conflict to be detected, conflict then performs step S1012 as do not detected, if conflict detected, performs step S1002.

Step S1012: one of at least following data feedback channel relevant information is sent to ONU: current up wavelength mark, current TWDM gap marker, current upgoing wave long value, OLT order is all is in the ONU of the wavelength calibration of current TWDM passage by upgoing wave long value corresponding for tuning for emission wavelength next step-length.Calibrating signal that all ONU on that channel send is received and after upstream data conflict not detected at OLT, OLT order is all is in the ONU of the wavelength calibration of current TWDM passage by upgoing wave long value corresponding for tuning for emission wavelength next step-length, performs step S1012.

Step S1014:ONU stores the corresponding relation between the tuner parameters of the transmission wavelength of oneself and upgoing wave long value or current TWDM passage or current up wavelength mark, completes the calibration of current up wavelength.If ONU receives the above-mentioned wavelength tuning order of OLT, ONU is by upgoing wave long value corresponding for tuning for emission wavelength next step-length.

After ONU completes the up wavelength calibration of first TWDM passage according to above-mentioned steps, ONU will receive wavelength tuning to next TWDM passage, when after the allocated bandwidth receiving the up wavelength calibration on second TWDM passage, if ONU does not complete the up wavelength calibration of this passage, and ONU be according to oneself can tuning wave-length coverage from minimal wave length to most long wavelength direction one by one wavelength channel calibrate, then determine whether that having completed all TWDM passage relevant information values is less than the above-mentioned up wavelength calibration not completing TWDM passage corresponding to wavelength calibration TWDM passage relevant information value, if completed, ONU by the emission wavelength of oneself be tuned to be greater than wavelength value corresponding to a step-length of upgoing wave long value corresponding to first TWDM passage after send up calibrating signal, carry out the up wavelength calibration of second TWDM passage, if do not completed, ONU do not respond above-mentioned OLT send the upstream bandwidth for wavelength calibration, ONU by downstream wavelength be tuned to next TWDM passage.OLT and ONU repeats above-mentioned steps, until ONU completes the up wavelength calibration of all data feedback channels.The step value of the tuning up wavelength of ONU can be the value that the 1/N at TWDM data feedback channel interval is corresponding.

In a preferred embodiment of the invention, preferably, ONU according to oneself can tuning wave-length coverage from minimal wave length, to most long wavelength direction, TWDM passage is calibrated one by one time, when ONU completes calibration at the TWDM passage that short wavelength is corresponding, TWDM channel end corresponding to short wavelength notifies that the TWDM channel end that adjacent long wavelength's passage is corresponding has ONU to need to calibrate.

Preferably, the up wavelength in above-mentioned all preferred embodiments and downstream wavelength can be the same or different.

From above description, can find out, present invention achieves following technique effect: carry out wavelength calibration according to OLT order ONU according to wavelength order, the uplink efficiency of whole PON system can be improved, reduction is to the precision of the clock synchronous between all TWDM passages of OLT in TWDMPON system, reduce the complexity of OLT, improve network service quality.

Execution mode five

5 TWDM passages are had, the corresponding TWDM channel end of each TWDM passage and one group of ONU, the corresponding downstream wavelength passage of each TWDM passage, one or more upgoing wave long-channel corresponding in TWDMPON system.The corresponding different downstream wavelength passage of different TWDM passages and different upgoing wave long-channels.Wherein ONU is without the up wavelength calibration record of any TWDM passage.

Step 1:OLT sends the static window for up wavelength calibration be directed to corresponding to its passage itself on each TWDM passage;

Step 2:OLT is by the order information of PLOAM message (Profile) descending transmission upgoing wave long-channel.This order information can have various ways.

Octet	Content
		1-2	ONU identifies (broadcast)
3	Type of message (Profile)
		4	Sequence number
5	CH1 (λ u1) <-logical number, from small to large
		6	CH1 (λ u2) <-logical number, from small to large
7	CH1 (λ u3) <-logical number, from small to large
		8	CH1 (λ u4) <-logical number, from small to large
9	CH1 (λ u5) <-logical number, from small to large
		10～40	Retain position (or mending 0)

Or

Step 3:ONU from the information receiving step 2, and is known at present not for the calibration information of all upgoing wave long-channels from self existing wavelength calibration information, determines to calibrate from CH1 (λ u1).Receiver is adjusted on λ d1 passage corresponding to λ u1, the static window information for λ u1 that in receiving step 1, OLT sends;

Step 4:ONU using transmitter adjustments to the smallest end of wavelength tuning range as wavelength detection position,

Step 5: repeat the PLOAM message SN_ONU sending response static window, wherein comprise the instruction of ONU identification information SN (or other can indicate the ID etc. of identity) and/or calibration probe message in SN_ONU message, and this probe message for target upgoing wave long-channel mark (or frequency), and start timer T1 when first time sends;

Step 6: if do not receive the response message of OLT feedback before timer T1 time-out, then the wavelength location of detection is increased S, and repeat step 5 on new position, until receive the response message of OLT feedback;

Step 7:ONU receives the response message of OLT transmission in λ d1 passage first time, and now wavelength detection position is λ u1L, is exemplified below:

Octet	Content
		1-2	ONU identifies (broadcast)
3	Type of message (Profile)
		4	Sequence number
5	Corresponding to the ONUID (essential) receiving detectable signal
		6	Current data feedback channel mark (essential)
7	Be currently received the frequency (optional) of detectable signal

8	Be currently received the power (optional) of detectable signal

Record λ u1L is the minimum wavelength border of current detection channels λ u1;

Step 8: continue the λ u1L in step 7 at every turn to increase S, until ONU cannot receive the response message that OLT returns, and arranges the wavelength detection position of the back of the wavelength detection position of correspondence the maximum wavelength border that λ u1R is minimum wavelength passage;

Step 9: the calibration wave-length coverage wave-length coverage of [λ u1L, λ u1R] being recorded as upgoing wave long-channel λ u1;

Execution mode six

Or

Step 7:ONU each increase wavelength after in detection process, the wavelength detection position corresponding when λ d1 passage returns response message from first time reception OLT, to receiving OLT returns to the wavelength detection position of response message after timer T1 time-out, the detail message that multiple OLT returns can be received, be exemplified below:

Octet	Content
		1-2	ONU identifies (broadcast)
3	Type of message (Profile)
		4	Sequence number
5	Corresponding to the ONUID (essential) receiving detectable signal
		6	Current data feedback channel mark (essential)
7	Be currently received the frequency (optional) of detectable signal
		8	Be currently received the power (essential) of detectable signal

Return the receiver power information indicated in response message according to OLT, determine that wavelength detection position λ u1C that maximal received power is corresponding is the centre wavelength point of minimum wavelength passage;

Execution mode seven

Or

Step 3:ONU from the information receiving step 2, and is known at present not for the calibration information of all upgoing wave long-channels from self existing wavelength calibration information, determines to calibrate from CH1 (λ u5).Receiver is adjusted on λ d5 passage corresponding to λ u5, the static window information for λ u5 that in receiving step 1, OLT sends;

Step 4:ONU using transmitter adjustments to the maximum end of wavelength tuning range as wavelength detection position,

Step 6: if do not receive the response message of OLT feedback before timer T1 time-out, then the wavelength location of detection is reduced S, and repeat step 5 on new position, until receive the response message of OLT feedback;

Step 7:ONU receives the response message of OLT transmission in λ d1 passage first time, and now wavelength detection position is λ u5R, is exemplified below:

Octet	Content
		1-2	ONU identifies (broadcast)
3	Type of message (Profile)
		4	Sequence number
5	Corresponding to the ONUID (essential) receiving detectable signal
		6	Current data feedback channel mark (essential)
7	Be currently received the frequency (optional) of detectable signal
		8	Be currently received the power (optional) of detectable signal

Record λ u5R is the maximum wavelength border of current detection channels λ u5;

Step 8: continue the λ u5R in step 7 to reduce S at every turn, until ONU cannot receive the response message that OLT returns, and the wavelength detection position of the back of the wavelength detection position of correspondence is arranged λ u5L is the minimum wavelength border of maximum wavelength passage;

Step 9: the calibration wave-length coverage wave-length coverage of [λ u5L, λ u5R] being recorded as upgoing wave long-channel λ u1;

Execution mode eight

Or

Step 7:ONU again to repeat to reduce after wavelength and detects, the wavelength detection position corresponding when λ d5 passage returns response message from first time reception OLT, to receiving OLT returns to the wavelength detection position of response message after timer T1 time-out, the detail message that multiple OLT returns can be received, be exemplified below:

Return the receiver power information indicated in response message according to OLT, determine that wavelength detection position λ u5C that maximal received power is corresponding is the centre wavelength point of minimum wavelength passage;

Execution mode nine

5 TWDM passages are had, the corresponding TWDM channel end of each TWDM passage and one group of ONU, the corresponding downstream wavelength passage of each TWDM passage, one or more upgoing wave long-channel corresponding in TWDMPON system.The corresponding different downstream wavelength passage of different TWDM passages and different upgoing wave long-channels.Wherein ONU has the up wavelength calibration record of λ u3.

Or

Step 3:ONU from the information receiving step 2, and knows the calibration information of existing λ u3 at present from self existing wavelength calibration information, determines to start to calibrate to adjacent CH2 (λ u2).Receiver is adjusted on λ d2 passage corresponding to λ u2, the static window information for λ u2 that in receiving step 1, OLT sends;

Step 4:ONU is using the wavelength minimum border range lambda u3L+T that indicates in transmitter adjustments to the calibration information of λ u3 as initial detection wavelength location, or the centre wavelength point λ u3C-CS/2 indicated in the calibration information of λ u3 is as initial detection wavelength location; Wherein T is the integral multiple of the minimum tuning step-length of ONU, and T<CS/2; Wherein CS is the wavelength difference between different upgoing wave long-channel; Object the detection original position for λ u2 is shifted out the wave-length coverage of λ u3, do not drop into again in λ u2.

Step 7:ONU receives the response message of OLT transmission in λ d2 passage first time, and now wavelength detection position is λ u2R, is exemplified below:

Record λ u2R is the maximum wavelength border of current detection channels λ u2;

Step 8: continue the λ u2R in step 7 to reduce S at every turn and continue detection, until ONU cannot receive the response message that OLT returns, and the wavelength detection position of the back of the wavelength detection position of correspondence being arranged the minimum wavelength border that λ u2L is λ u2;

Step 9: the calibration wave-length coverage wave-length coverage of [λ u2L, λ u2R] being recorded as upgoing wave long-channel λ u2;

Step 7-9, according to step 7 in execution mode six, can replace to another method, does not repeat them here.

Execution mode ten

Or

Step 3:ONU from the information receiving step 2, and knows the calibration information of existing λ u3 at present from self existing wavelength calibration information, determines to start to calibrate to adjacent CH2 (λ u4).Receiver is adjusted on λ d4 passage corresponding to λ u4, the static window information for λ u4 that in receiving step 1, OLT sends;

Step 4:ONU is using the wavelength maximum boundary range lambda u4L+T that indicates in transmitter adjustments to the calibration information of λ u3 as initial detection wavelength location, or the centre wavelength point λ u3C+CS/2 indicated in the calibration information of λ u4 is as initial detection wavelength location; Wherein T is the integral multiple of the minimum tuning step-length of ONU, and T<CS/2; Wherein CS is the wavelength difference between different upgoing wave long-channel; Object the detection original position for λ u4 is shifted out the wave-length coverage of λ u3, do not drop into again in λ u4.

Step 7:ONU receives the response message of OLT transmission in λ d4 passage first time, and now wavelength detection position is λ u4L, is exemplified below:

Record λ u4L is the minimum wavelength border of current detection channels λ u4;

Step 8: continue the λ u2L in step 7 successively increase S and detect, until ONU cannot receive the response message that OLT returns, and arranges the wavelength detection position of the back of the wavelength detection position of correspondence the maximum wavelength border that λ u4R is λ u4;

Step 9: the calibration wave-length coverage wave-length coverage of [λ u4L, λ u4R] being recorded as upgoing wave long-channel λ u4;

From above description, can find out, present invention achieves following technique effect: ONU carries out up wavelength calibration according to the order of up wave-length coverage, can improve, the uplink efficiency of PON system, reduce the precision of the clock synchronous between all TWDM to OLT in TWDMPON system, passage, reduce the complexity of OLT, improve network service quality.

Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.

These are only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. a calibration steps for the upgoing wave long-channel of passive optical network PON system, is characterized in that, described method comprises:

Optical network unit ONU is according to the order of the correlation of upgoing wave long-channel and/or upgoing wave long-channel, described upgoing wave long-channel is calibrated, wherein, described order is the correlation sequence from big to small or from small to large according to upgoing wave long-channel and/or upgoing wave long-channel.

2. method according to claim 1, is characterized in that, ONU, according to the order of the correlation of upgoing wave long-channel and/or upgoing wave long-channel, calibrates described upgoing wave long-channel, comprising:

Described ONU obtains at least one first signal in described PON system at least one TWDM passage, and wherein, described first signal is by the order of the correlation instruction upgoing wave long-channel of the upgoing wave long value of TWDM passage that carries and/or upgoing wave long-channel;

Described ONU calibrates according to the selective sequential upgoing wave long-channel of described upgoing wave long-channel.

3. method according to claim 2, is characterized in that, described ONU calibrates described upgoing wave long-channel, comprising:

Described ONU determines the original position to selecting the upgoing wave long-channel obtained to calibrate;

Described ONU calibrates the upgoing wave long-channel that described selection obtains from described original position.

4. method according to claim 3, is characterized in that, described ONU determines that the upgoing wave long-channel selecting to obtain carries out the original position of calibrating, and comprises one of following:

When ONU does not exist calibrated upgoing wave long-channel, described ONU selects the maximum wavelength in the tuning range self supported or minimum wavelength as described original position;

When ONU exists calibrated upgoing wave long-channel, described ONU determines described original position according to calibrated upgoing wave long-channel.

5. method according to any one of claim 1 to 4, is characterized in that, described ONU calibrates described upgoing wave long-channel, comprising:

Described ONU obtains the resource information that can be used in the TWDM passage of upgoing wave long-channel place calibrating;

Described ONU, from the original position determined, sends secondary signal based on described resource information;

Described ONU calibrates according to the response whether receiving described secondary signal the upgoing wave long-channel that described selection obtains.

6. method according to claim 5, is characterized in that, wherein, described ONU calibrates according to the response whether receiving described secondary signal the upgoing wave long-channel that described selection obtains, and comprises one of following:

When not receiving described response on a preset condition based, described ONU sends the wavelength of described secondary signal according to default step-length adjustment, and wavelength location after the adjustment sends described secondary signal based on described resource information;

When described pre-conditioned under receive described response time, the wavelength location sending described secondary signal is recorded as the calibration information of described upgoing wave long-channel by described ONU, and adjusts wavelength location according to default step-length and send described secondary signal based on described resource information;

When after the signal receiving the instruction conflict that TWDM channel end sends, ONU again sends described secondary signal based on described resource information in existing wavelength location.

7. method according to any one of claim 1 to 6, is characterized in that, also comprises:

Described ONU suspends after receiving the order of TWDM passage transmission or continues wavelength calibration.

8. method according to claim 6, is characterized in that, described ONU sends the wavelength of described secondary signal according to the adjustment of default step-length, at least comprises one of following:

If original position is greater than current calibrated wavelength, described in be adjusted to increase wavelength;

If original position is less than described current calibrated wavelength, described in be adjusted to reduction wavelength;

Original position be described ONU select in the tuning range self supported maximum wavelength time, described in be adjusted to reduction wavelength;

Original position be described ONU select in the tuning range self supported minimum wavelength time, described in be adjusted to increase wavelength.

9. method according to claim 5, is characterized in that, also comprises:

Described ONU, after record calibration information, adjusts wavelength location according to default step-length and sends described secondary signal based on described resource information.

10. method according to claim 9, is characterized in that, also comprises:

Up transmission wavelength location when receiving described response is for the first time recorded as the minimum wavelength value of described up wavelength by described ONU;

The up transmission wavelength location of the response correspondence received for the last time is recorded as the maximum wavelength value of described up wavelength by described ONU.

11. methods according to claim 9, is characterized in that, also comprise:

Determine to receive described response to during receiving described response for the last time from first time, the received power indicated in described response up wavelength location that is maximum or optimum position is the intermediate wave long value of described up wavelength.

12. methods according to any one of claim 6 to 8, is characterized in that, describedly pre-conditionedly to comprise: the scheduled time and/or predetermined number of retransmissions; Wherein,

If do not receive the response of described secondary signal in the scheduled time after sending described secondary signal, then determine not receive described response; Or

If do not receive described response within the described scheduled time, then retransmit described secondary signal, until receive described response or sending times is greater than described predetermined number of retransmissions.

13. methods according to any one of claim 5 to 8, is characterized in that, the information that described response is carried comprise following one of at least:

Mark, current upgoing wave long value, the received power information of described secondary signal, the received power change information of described secondary signal of the TWDM passage of current upgoing wave long-channel mark, transmission response.

14. methods according to claim 4, is characterized in that, according to calibrated upgoing wave long-channel, described ONU determines that described original position comprises:

Described ONU is according to the up wavelength location of the best of calibrating upgoing wave long-channel, and the spacing value between upgoing wave long-channel, determines the original position of current alignment upgoing wave long-channel;

Wherein, when having calibrated upgoing wave long-channel described in being greater than from original position, mobile for increase up wavelength according to described spacing value; Calibrated upgoing wave long-channel constantly described in being less than when original position, described movement is for reduce up wavelength according to described spacing value.

The calibration steps of the up wavelength of 15. 1 kinds of passive optical network PON systems, is characterized in that, described method comprises:

Optical line terminal OLT sends at least one first signal on time-division wavelength division multiplexing TWDM passage, wherein, described first signal indicates the order of upper wavelength channel by the upgoing wave long-channel of described TWDM passage that carries and/or upgoing wave long-channel correlation, wherein, described order is according to wavelength and/or the sequence from big to small or from small to large of upgoing wave long-channel correlation.

16. methods according to claim 15, is characterized in that, described optical line terminal OLT sends the ascending resource information being used for the calibration of upgoing wave long-channel on TWDM passage.

17. methods according to claim 15, is characterized in that, also comprise:

Described OLT receives the secondary signal for the calibration of upgoing wave long-channel that at least one ONU sends, and wherein, described secondary signal carries mark or the relevant information of the ONU sending described secondary signal;

Described OLT sends the response of described secondary signal at least one ONU described, wherein, the information of carrying in described response comprise following one of at least: current upgoing wave long-channel mark, current TWDM gap marker, current upgoing wave long-channel wavelength value, the received power information of receiver, the received power change information of receiver.

18. methods according to claim 17, is characterized in that, also comprise:

After described OLT detects the secondary signal of conflict in an ascending resource calibrated for upgoing wave long-channel, OLT notifies that described ONU detects the 3rd signal of conflict.

19. methods according to claim 17, is characterized in that, also comprise:

Described OLT is after receiving described secondary signal, and what increase described ascending resource arranges frequency;

And/or described OLT is not after receiving described secondary signal, the described ascending resource that slows down frequency is set.

20. 1 kinds of optical network unit ONU, is characterized in that, comprising:

Calibrating installation, for the order of the correlation according to upgoing wave long-channel and/or upgoing wave long-channel, calibrate described upgoing wave long-channel, wherein, described order is the correlation sequence from big to small or from small to large according to upgoing wave long-channel and/or upgoing wave long-channel.

21. ONU according to claim 20, is characterized in that, described calibrating installation, comprising:

Acquisition module, for obtaining at least one first signal in PON system at least one TWDM passage, wherein, described first signal is by the order of the correlation instruction upgoing wave long-channel of the upgoing wave long value of TWDM passage that carries and/or upgoing wave long-channel;

Calibration module, calibrates for the selective sequential upgoing wave long-channel according to described upgoing wave long-channel.

22. ONU according to claim 21, is characterized in that, described calibration module, comprising:

Determining unit, for determining the original position to selecting the upgoing wave long-channel obtained to calibrate;

Alignment unit, for calibrating the upgoing wave long-channel that described selection obtains from described original position.

23. ONU according to claim 22, is characterized in that, described determining unit, determine to comprise the original position selecting the upgoing wave long-channel that obtains to calibrate one of following:

When there is not calibrated upgoing wave long-channel, the maximum wavelength in the tuning range selecting self to support or most small echo

Long as described original position;

When there is calibrated upgoing wave long-channel, determine described original position according to calibrated upgoing wave long-channel.

24. 1 kinds of optical line terminal OLT, is characterized in that, comprising:

First sending module, for sending at least one first signal on time-division wavelength division multiplexing TWDM passage, wherein, described first signal indicates the order of upper wavelength channel by the upgoing wave long-channel of described TWDM passage that carries and/or upgoing wave long-channel correlation, wherein, described order is according to wavelength and/or the sequence from big to small or from small to large of upgoing wave long-channel correlation.

25. OLT according to claim 24, is characterized in that, described first sending module, also for sending the ascending resource information being used for the calibration of upgoing wave long-channel on TWDM passage.

26. OLT according to claim 24, is characterized in that, also comprise:

Receiver module, for receiving the secondary signal for the calibration of upgoing wave long-channel that at least one ONU sends, wherein, described secondary signal carries mark or the relevant information of the ONU sending described secondary signal;

Second sending module, for sending the response of described secondary signal at least one ONU described, wherein, the information of carrying in described response comprise following one of at least: current upgoing wave long-channel mark, current TWDM gap marker, current upgoing wave long-channel wavelength value, the received power information of receiver, the received power change information of receiver.

27. OLT according to claim 26, is characterized in that, also comprise:

Notification module, for one for upgoing wave long-channel calibration ascending resource in the secondary signal of conflict detected after, OLT notifies that described ONU detects the 3rd signal of conflict.

28. OLT according to claim 26, is characterized in that, also comprise:

Increase module, for after receiving described secondary signal, what increase described ascending resource arranges frequency; And/or

Reduce module, for after not receiving described secondary signal, the described ascending resource that slows down frequency is set.