阅读说明：本技术 一种基于正交编码的onu定位系统和定位方法 (A kind of ONU positioning system and localization method based on orthogonal coding ) 是由 张佐星 施冬钢 胡龙舟 张峰 郭莎莎 于 2019-09-11 设计创作，主要内容包括：本发明提供了一种基于正交编码的ONU定位系统和定位方法,包括由用于连接光纤干线的光线路终端OLT、用于无源分配的光分配网络ODN和用于提供用户侧接口的光网络单元ONU依次串联组成的无源光纤网络PON；通过给每个ONU分配唯一的特征码,在不增加额外条件的情况下,实现对TDM-PON网络中的故障ONU的定位功能。(The present invention provides a kind of ONU positioning system and localization method based on orthogonal coding, including by the optical line terminal OLT for connecting fiber optic backbone, the passive optical-fiber network PON that is sequentially connected in series for the Optical Distribution Network ODN of passive distribution and the optical network unit ONU for providing user side interface；By distributing unique condition code to each ONU, in the case where not increasing extra condition, the positioning function to the faulted ONU in TDM-PON network is realized.)

1. a kind of ONU positioning system based on orthogonal coding, it is characterised in that: including by optical line terminal OLT, Optical Distribution Network The passive optical-fiber network PON that ODN and optical network unit ONU are sequentially connected in series；

Optical line terminal OLT be used for connect fiber optic backbone and complete data convergence distribution access service, including OLT transmitting terminal, Optical time domain reflectometer OTDR, 8B/10B coding unit, orthogonal coding unit, the first photoelectric converter, the first processing of circuit unit, First annular device, channel join-splitting device and the receiving end OLT；OLT transmitting terminal for sending downlink signal, 8B/10B coding unit for pair The downlink signal carries out 8B/10B coding；Optical time domain reflectometer OTDR is used to send comprising a series of different coding features The pulse signal of orthogonal code, the correlative coding for receiving first annular device return simultaneously pass through comparison positioning failure ONU condition code；It is orthogonal Coding unit is used to carry out orthogonal coding to the pulse signal；First processing of circuit unit is used to compile the 8B/10B Code and orthogonal coding are overlapped in electrical domain；The electric signal that first photoelectric converter is used to export the first processing of circuit unit turns It is changed to optical signal；First annular device is used to the optical signal of the first photoelectric converter conversion output being sent to channel join-splitting device, and will The correlative coding that channel join-splitting device returns is sent to optical time domain reflectometer OTDR；Channel join-splitting device is used to receive first annular device output Optical signal is simultaneously sent to Optical Distribution Network ODN, while the Optical Distribution Network ODN Signal separator returned is gone out uplink signal and is sent to The receiving end OLT isolates correlative coding by first annular device and is sent to optical time domain reflectometer OTDR；

Optical Distribution Network ODN is used to provide two-way transmission line between optical line terminal OLT and optical network unit ONU, Light-splitting box including different splitting ratios in parallel, the optical-path interface of the two sides Optical Distribution Network ODN respectively with the transmitting-receiving of channel join-splitting device End is connected with the sending and receiving end of the second circulator；

Optical network unit ONU for providing user side interface, including the second circulator, high pass filter unit, low-pass filter unit, The receiving end ONU, correlative coding unit, ONU transmitting terminal, the second photoelectric converter and second circuit processing unit；Second circulator For receiving the signal of Optical Distribution Network ODN output and being respectively sent to high pass filter unit and low-pass filter unit, connect simultaneously It receives the optical signal of the second photoelectric converter transmission and is sent to Optical Distribution Network ODN；High pass filter unit is used for the second annular The Signal separator of device output goes out downlink signal；The receiving end ONU is used to receive the downlink signal；Low-pass filter unit is used for will The Signal separator of second circulator output goes out orthogonal coding；Correlative coding unit is used to receive the orthogonal coding and carries out phase Close coding；ONU transmitting terminal is for sending uplink signal；Second circuit processing unit is used to believe the correlative coding and uplink It number is overlapped in electrical domain；Second photoelectric converter is used to being converted to the electric signal that second circuit processing unit exports into light letter Number.

2. a kind of ONU positioning system based on orthogonal coding according to claim 1, it is characterised in that: optical line terminal OLT further includes network management unit, and network management unit is used to receive the signal of optical time domain reflectometer OTDR output and shows data.

3. a kind of localization method of ONU positioning system based on orthogonal coding according to claim 1, it is characterised in that: The following steps are included:

The downlink signal that S1:OLT transmitting terminal is sent carries out 8B/10B coding, optical time domain reflectometer by 8B/10B coding unit The pulse signal for the orthogonal code comprising different coding feature that OTDR is sent carries out orthogonal coding by orthogonal coding unit；8B/ 10B coding and orthogonal coding are overlapped by the first processing of circuit unit in electrical domain；First photoelectric converter is by the first circuit The electric signal of processing unit output is converted into optical signal；Optical signal passes sequentially through first annular device and channel join-splitting device is sent to light point Distribution network ODN downlink transfer；

The signal of S2: the second circulator downlink output separates downlink signal by high pass filter unit and is sent to the receiving end ONU, Orthogonal coding is separated by low-pass filter unit and is sent to correlative coding unit；

S3: optical network unit ONU sends uplink signal and correlative coding to optical line terminal OLT；

S4: channel join-splitting device separation uplink signal is sent to the receiving end OLT, and channel join-splitting device sends out correlative coding by first annular device It is sent to optical time domain reflectometer OTDR；

S5: optical time domain reflectometer OTDR judge optical network unit ONU whether failure；

S6: optical time domain reflectometer OTDR positioning failure optical network unit ONU.

4. a kind of localization method according to claim 3, it is characterised in that: in the step S3, specific steps are as follows:

S31: correlative coding unit distributes ONU condition code corresponding with the orthogonal code that pulse signal in step S11 includes；

S32: orthogonal coding and ONU condition code are carried out correlative coding by correlative coding unit；

S33: the uplink signal that correlative coding is sent with ONU transmitting terminal is overlapped by second circuit processing unit in electrical domain； The electric signal that second circuit processing unit exports is converted into optical signal by the second photoelectric converter；

S34: optical signal is sent to Optical Distribution Network ODN uplink by the second circulator.

5. a kind of localization method according to claim 4, it is characterised in that: in the step S5, specific steps are as follows:

The correlative coding received and the pulse signal of transmission are carried out related operation by S51: optical time domain reflectometer OTDR；

S52: judge whether correlation result is zero；If correlation result is not zero, judge all ONU links normally simultaneously Export result；Operation result is zero if it exists, then judges that the corresponding optical network unit ONU of the operation result breaks down.

6. a kind of localization method according to claim 5, it is characterised in that: in the step S6, specific steps are as follows:

S61: the correlative coding that correlation result is zero in step S52 and supplement code are found out；

S62: the ONU condition code of comparison complement code and step S31 marks ONU condition code if complement code is equal to ONU condition code；If mending Code is not equal to ONU condition code, then continues comparison until comparison is completed.

7. a kind of localization method according to claim 6, it is characterised in that: further include step S7: by input terminal and light The network unit of the output end connection of time-domain reflectomer OTDR receives and shows the ONU failure letter that optical time domain reflectometer OTDR is issued Breath and fault distance.

Technical field

The invention belongs to passive optical-fiber network technical fields, and in particular to a kind of ONU positioning system based on orthogonal coding And localization method.

Background technique

Passive optical-fiber network PON (Passive Optical Network) is by optical line terminal OLT (optical line Terminal), Optical Distribution Network ODN (Optical Distribution Network) and optical network unit ONU (Optical Network Unit) composition, mainly use TDM time-division multiplex technology, also known as TDM-PON network；Pass through ODN between OLT and ONU The optical fiber link transmission signal for including, OLT to ONU are downlink signal, and ONU to OLT is uplink signal.Multiple ONU of ONU end are logical It crosses time division technique and different time slot packets is transferred to OLT, the business letter that the end OLT passes through parsing packet content recognition ONU uplink signal Breath judges whether the ONU is in place.

Patent CN109510727A is that a kind of method and system for being automatically positioned ONU failure is proposed based on above-mentioned thinking, The operation information of itself is reported by ONU, OLT to judge whether ONU breaks down and the type of failure.This method can be sentenced Disconnected ONU whether failure, but can not judge the failure cause of ONU.

Patent CN102739305A further provide the localization method of exception ONU in a kind of passive optical network, system and Every group of optical power a reference value and multilevel threshold is arranged by the way that ONU to be grouped in device, optical power when by abnormality with A reference value compares the grouping serial number for determining failure, reduces the fault coverage of ONU, reduces investigation human cost.The party Method can be with the section where positioning failure ONU, but can not judge the specific ONU unit to break down and failure cause.

Patent CN109039444A further provides a kind of ONU method for detecting abnormality, device, OLT and optical-fiber network, passes through Uplink frame error rate determines the group where exception ONU, and the ascending time slot of each ONU detects light signal strength in adjustment group, according to detection As a result exception ONU unit is determined.This method may determine that the specific ONU unit for failure occur, but still can not judge the failure of ONU Reason.

As the above analysis, at present in passive optical network for the fault detection of ONU can only judge ONU whether failure, It can not judge that failure is as caused by fiber break or caused by ONU element failure.Optical time domain is introduced there are many scheme Reflectometer OTDR (Optical Time Domain Reflectometer) positions ONU failure cause.

Patent CN1866790A proposes a kind of PON network design method using OTDR light path, by the olt OTDR is introduced to position ONU.The ODN link that this method requires ONU to be passed through all branch's optical path lengths in deployment are equal It is different.

Patent CN103905112A proposes a kind of passive optical network fault detection method, device and system, and core is to adopt All ONU are positioned with the test of OTDR twice, reflector is not added in test for the first time, and second of test increases reflector, such as The amplitude of fruit reflection peak reduces, then the ONU of reflector is currently added to break down.This method require to all ONU carry out increase and Remove the operation of reflector.

Above method is unable to the equal ONU unit of spacer OLT, it is also necessary to artificial to participate in increasing ONU end reflection enhancement The cost of passive network fault location, extends fault correction time.

Summary of the invention

The technical problem to be solved by the present invention is a kind of ONU positioning system and localization method based on orthogonal coding is provided, For positioning faulty ONU in the case where not increasing extra condition.

The technical solution taken by the invention to solve the above technical problem are as follows: a kind of based on orthogonal coding positioning ONU's System, including the passive optical network being sequentially connected in series by optical line terminal OLT, Optical Distribution Network ODN and optical network unit ONU Network PON；Optical line terminal OLT is used to connect fiber optic backbone and complete the access service of data convergence distribution, including OLT transmitting End, optical time domain reflectometer OTDR, 8B/10B coding unit, orthogonal coding unit, the first photoelectric converter, the first processing of circuit list First, first annular device, channel join-splitting device and the receiving end OLT；OLT transmitting terminal is used for sending downlink signal, 8B/10B coding unit In to the downlink signal progress 8B/10B coding；Optical time domain reflectometer OTDR is special comprising a series of different codings for sending The pulse signal of the orthogonal code of sign, the correlative coding for receiving first annular device return simultaneously pass through comparison positioning failure ONU condition code； Orthogonal coding unit is used to carry out orthogonal coding to the pulse signal；First processing of circuit unit is used for the 8B/ 10B coding and orthogonal coding are overlapped in electrical domain；First photoelectric converter is used for the electricity for exporting the first processing of circuit unit Signal is converted to optical signal；First annular device is used to the optical signal of the first photoelectric converter conversion output being sent to conjunction partial wave Device, and the correlative coding that channel join-splitting device returns is sent to optical time domain reflectometer OTDR；Channel join-splitting device is first annular for receiving The optical signal of device output is simultaneously sent to Optical Distribution Network ODN, while the Optical Distribution Network ODN Signal separator returned is gone out uplink letter Number it is sent to the receiving end OLT, isolates correlative coding by first annular device and be sent to optical time domain reflectometer OTDR；Optical distribution network Network ODN between optical line terminal OLT and optical network unit ONU for providing two-way transmission line, not including parallel connection With the light-splitting box of splitting ratio, the optical-path interface of the two sides Optical Distribution Network ODN is annular with the sending and receiving end of channel join-splitting device and second respectively The sending and receiving end of device connects；Optical network unit ONU is including the second circulator, high pass filter unit, low for providing user side interface Pass filtering unit, the receiving end ONU, correlative coding unit, ONU transmitting terminal, the second photoelectric converter and second circuit processing unit； Second circulator is used to receive the signal of Optical Distribution Network ODN output and is respectively sent to high pass filter unit and low-pass filtering list Member, while receiving the optical signal of the second photoelectric converter transmission and being sent to Optical Distribution Network ODN；High pass filter unit is used for will The Signal separator of second circulator output goes out downlink signal；The receiving end ONU is used to receive the downlink signal；Low-pass filtering list Member is for going out orthogonal coding for the Signal separator that the second circulator exports；Correlative coding unit is used to receive the orthogonal coding And carry out correlative coding；ONU transmitting terminal is for sending uplink signal；Second circuit processing unit is used for the correlative coding It is overlapped with uplink signal in electrical domain；The electric signal that second photoelectric converter is used to export second circuit processing unit is converted For optical signal.

According to the above scheme, optical line terminal OLT further includes network management unit, and network management unit is for receiving optical time domain reflectometer The signal of OTDR output simultaneously shows data.

A kind of ONU localization method based on orthogonal coding, comprising the following steps:

The downlink signal that S1:OLT transmitting terminal is sent carries out 8B/10B coding, optical time domain reflection by 8B/10B coding unit The pulse signal for the orthogonal code comprising different coding feature that instrument OTDR is sent carries out orthogonal coding by orthogonal coding unit； 8B/10B coding and orthogonal coding are overlapped by the first processing of circuit unit in electrical domain；First photoelectric converter is electric by first The electric signal of road processing unit output is converted into optical signal；Optical signal passes sequentially through first annular device and channel join-splitting device is sent to light Distribute network ODN downlink transfer；

The signal of S2: the second circulator downlink output separates downlink signal and is sent to ONU and connects by high pass filter unit Receiving end separates orthogonal coding by low-pass filter unit and is sent to correlative coding unit；

S3: optical network unit ONU sends uplink signal and correlative coding to optical line terminal OLT；

S4: channel join-splitting device separation uplink signal is sent to the receiving end OLT, and channel join-splitting device passes through correlative coding first annular Device is sent to optical time domain reflectometer OTDR；

S5: optical time domain reflectometer OTDR judge optical network unit ONU whether failure；

S6: optical time domain reflectometer OTDR positioning failure optical network unit ONU.

Further, in the step S3, specific steps are as follows:

S31: correlative coding unit distributes ONU condition code corresponding with the orthogonal code that pulse signal in step S11 includes；

S32: orthogonal coding and ONU condition code are carried out correlative coding by correlative coding unit；

S33: the uplink signal that correlative coding is sent with ONU transmitting terminal is folded by second circuit processing unit in electrical domain Add；The electric signal that second circuit processing unit exports is converted into optical signal by the second photoelectric converter；

S34: optical signal is sent to Optical Distribution Network ODN uplink by the second circulator.

Further, in the step S5, specific steps are as follows:

The correlative coding received and the pulse signal of transmission are carried out related operation by S51: optical time domain reflectometer OTDR；

S52: judge whether correlation result is zero；If correlation result is not zero, all ONU links are being judged just Often and export result；Operation result is zero if it exists, then judges that the corresponding optical network unit ONU of the operation result breaks down.

Further, in the step S6, specific steps are as follows:

S61: the correlative coding that correlation result is zero in step S52 and supplement code are found out；

S62: the ONU condition code of comparison complement code and step S31 marks ONU condition code if complement code is equal to ONU condition code； If complement code is not equal to ONU condition code, continue comparison until comparison is completed.

It further, further include step S7: the network being connect by input terminal with the output end of optical time domain reflectometer OTDR Unit receives and shows the ONU fault message and fault distance that optical time domain reflectometer OTDR is issued.

The invention has the benefit that

1. a kind of system based on orthogonal coding positioning ONU of the invention is by distributing unique condition code to each ONU, Realize the function that faulty ONU is positioned in the case where not increasing extra condition.

2. the ONU unit that the present invention can be spacer OLT equal, application range are wider.

3. reflection of the present invention without artificial ginseng enhancing ONU end, reduces the cost of passive network fault location, reduces Fault correction time.

Detailed description of the invention

Fig. 1 is the functional block diagram of the embodiment of the present invention.

Fig. 2 is the flow chart of the embodiment of the present invention.

Specific embodiment

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Referring to fig. 2, the embodiment of the present invention includes by optical line terminal OLT, Optical Distribution Network ODN and optical network unit The passive optical-fiber network PON that ONU is sequentially connected in series.

Optical line terminal OLT is used to connect fiber optic backbone and complete the access service of data convergence distribution, including OLT transmitting End, optical time domain reflectometer OTDR, 8B/10B coding unit, orthogonal coding unit, the first photoelectric converter, the first processing of circuit list First, first annular device, channel join-splitting device, the receiving end OLT and network management unit；OLT transmitting terminal is compiled for sending downlink signal, 8B/10B Code unit is used to carry out 8B/10B coding to the downlink signal；Optical time domain reflectometer OTDR for send comprising it is a series of not With the orthogonal code of coding characteristic pulse signal, receive correlative coding that first annular device returns and by comparison positioning failure ONU condition code；Orthogonal coding unit is used to carry out orthogonal coding to the pulse signal；First processing of circuit unit is used for will The 8B/10B coding and orthogonal coding are overlapped in electrical domain；First photoelectric converter is used for the first processing of circuit unit The electric signal of output is converted to optical signal；First annular device is used to for the optical signal of the first photoelectric converter conversion output being sent to Channel join-splitting device, and the correlative coding that channel join-splitting device returns is sent to optical time domain reflectometer OTDR；Channel join-splitting device is for receiving the The optical signal of one circulator output is simultaneously sent to Optical Distribution Network ODN, while the Optical Distribution Network ODN Signal separator returned being gone out Uplink signal is sent to the receiving end OLT, isolates correlative coding by first annular device and is sent to optical time domain reflectometer OTDR；Net Pipe unit is used to receive the ONU fault message of optical time domain reflectometer OTDR output and shows data.

Optical Distribution Network ODN is logical for providing two-way optical transport between optical line terminal OLT and optical network unit ONU Road, the light-splitting box including different splitting ratios in parallel, the optical-path interface of the two sides Optical Distribution Network ODN respectively with the receipts of channel join-splitting device Originator is connected with the sending and receiving end of the second circulator.

Optical network unit ONU is for providing user side interface, including the second circulator, high pass filter unit, low-pass filtering Unit, the receiving end ONU, correlative coding unit, ONU transmitting terminal, the second photoelectric converter and second circuit processing unit；Second ring Shape device is used to receive the signal of Optical Distribution Network ODN output and is respectively sent to high pass filter unit and low-pass filter unit, together When receive the second photoelectric converter transmission optical signal and be sent to Optical Distribution Network ODN；High pass filter unit is used for second The Signal separator of circulator output goes out downlink signal；The receiving end ONU is used to receive the downlink signal；Low-pass filter unit is used Go out orthogonal coding in the Signal separator for exporting the second circulator；Correlative coding unit is used to receive the orthogonal coding and goes forward side by side Row correlative coding；ONU transmitting terminal is for sending uplink signal；Second circuit processing unit be used for the correlative coding and Row signal is overlapped in electrical domain；Second photoelectric converter is used to the electric signal that second circuit processing unit exports being converted to light Signal.

A kind of ONU localization method based on orthogonal coding, comprising the following steps:

The downlink signal that S1:OLT transmitting terminal is sent carries out 8B/10B coding, optical time domain reflection by 8B/10B coding unit The pulse signal for the orthogonal code comprising different coding feature that instrument OTDR is sent carries out orthogonal coding by orthogonal coding unit； 8B/10B coding and orthogonal coding are overlapped by the first processing of circuit unit in electrical domain；First photoelectric converter is electric by first The electric signal of road processing unit output is converted into optical signal；Optical signal passes sequentially through first annular device and channel join-splitting device is sent to light Distribute network ODN downlink transfer.

The signal of S2: the second circulator downlink output separates downlink signal and is sent to ONU and connects by high pass filter unit Receiving end separates orthogonal coding by low-pass filter unit and is sent to correlative coding unit.

S3: optical network unit ONU sends uplink signal and correlative coding to optical line terminal OLT:

S31: correlative coding unit distributes ONU condition code corresponding with the orthogonal code that pulse signal in step S11 includes；

S32: orthogonal coding and ONU condition code are carried out correlative coding by correlative coding unit；

S33: the uplink signal that correlative coding is sent with ONU transmitting terminal is folded by second circuit processing unit in electrical domain Add；The electric signal that second circuit processing unit exports is converted into optical signal by the second photoelectric converter；

S34: optical signal is sent to Optical Distribution Network ODN uplink by the second circulator.

S4: channel join-splitting device separation uplink signal is sent to the receiving end OLT, and channel join-splitting device passes through correlative coding first annular Device is sent to optical time domain reflectometer OTDR.

S5: optical time domain reflectometer OTDR judge optical network unit ONU whether failure:

The correlative coding received and the pulse signal of transmission are carried out related operation by S51: optical time domain reflectometer OTDR；

S52: judge whether correlation result is zero；If correlation result is not zero, all ONU links are being judged just Often and export result；Operation result is zero if it exists, then judges that the corresponding optical network unit ONU of the operation result breaks down.

S6: optical time domain reflectometer OTDR positioning failure optical network unit ONU:

S61: the correlative coding that correlation result is zero in step S52 and supplement code are found out；

S62: the ONU condition code of comparison complement code and step S31 marks ONU condition code if complement code is equal to ONU condition code； If complement code is not equal to ONU condition code, continue comparison until comparison is completed.

S7: it is received by the network unit that input terminal is connect with the output end of optical time domain reflectometer OTDR and shows optical time domain The OTDR curve event information that reflectometer OTDR is issued and the ONU fault message including labeled ONU condition code and event Hinder distance.

Above embodiments are merely to illustrate design philosophy and feature of the invention, and its object is to make technology in the art Personnel can understand the content of the present invention and implement it accordingly, and protection scope of the present invention is not limited to the above embodiments.So it is all according to It is within the scope of the present invention according to equivalent variations made by disclosed principle, mentality of designing or modification.