CN104506970A - Polling passive optical network optical layer detection method based on optical pre-coding - Google Patents
Polling passive optical network optical layer detection method based on optical pre-coding Download PDFInfo
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- CN104506970A CN104506970A CN201410802093.XA CN201410802093A CN104506970A CN 104506970 A CN104506970 A CN 104506970A CN 201410802093 A CN201410802093 A CN 201410802093A CN 104506970 A CN104506970 A CN 104506970A
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Abstract
The invention discloses a polling passive optical network optical layer detection device and method based on optical pre-coding. The device comprises three major modules including a detection pulse pre-coding module, a link fault recognition module and a decoder module, wherein the detection pulse pre-coding module and the link fault recognition module are connected with an OLT (optical line terminal) device and a feed-in optical fiber through an optical circulator and a wavelength division multiplexer, and the feed-in optical fiber is connected with each distributive optical fiber through an optical branching device positioned at a remote end node, and is connected with each user end through different decoders at the tail end of each distributive optical fiber. The device and the method have the advantages that pre-coding detection pulse signals are used, a polling mode is adopted, and the fault monitoring only aims at the optical fiber link of one target user in one time. The length of the monitored branch link is known, a detection time window is reduced to a very small time window, the code word coherent distance is reduced, and the accuracy of a monitoring system is improved.
Description
Technical field
The invention belongs to technical field of optical fiber communication, relate to a kind of polling type EPON photosphere detection method based on light precoding.
Background technology
In recent years, passive optical network PON (the Passive Optical Network) technology in soft exchange field is widely used.The development of passive optical network PON technology, not only increases message transmission rate, and adds carrying number of users.Therefore, PON any optical link (feed-in optical fiber and profile fiber) fault (fracture, aging or bending loss) all can cause the loss of mass data information, and user satisfaction reduces, and also brings economic loss to Virtual network operator.Therefore, in the past few years, EPON link failure detection method obtains increasing concern.Traditional optical time domain reflectometer OTDR (Optical Time Domain Reflectometer) is widely used in the remote detection of point-to-point link, in the PON system of point-to-multipoint, OTDR technology but has larger restriction: the optical branching device place that reverse signal is being positioned at distant-end node of all profile fiber branch roads superposes mutually, is difficult to distinguish some reverse signals from which bar profile fiber branch road.
Through finding existing literature search, in order to make up the deficiency of the PON link monitoring system based on OTDR, the people such as M.M.Rad propose based on pumped FIR laser OC(Optical Coding) EPON link monitoring method.Propose three kinds of different codings mechanism link monitoring schemes in the literature: 1) based on multi-wavelength light orthogonal coding MW-OOC(Multi-Wavelength Optical Orthogonal Code) PON link monitoring scheme, this monitoring system does not use any active device in optical distribution network, newly do not add any self energy module in ONU end, adopt centralized automatic monitoring surveyor's chain line state at local side.But this system has many restrictions in practicality: coder/decoder assembly is more, and cost is higher, volume is comparatively large, and encoder insertion loss is comparatively large, reduces encoded signal quality; Code word space is limited, and network scalability is poor; 2) based on cycle code PC(Optical Code) PON link monitoring scheme, program decoder have structure simple, realize that cost is lower, insertion loss is less, but still there are some shortcomings in this system: PC correlation is poor, reflected signal identifying more complicated.Corresponding recognizer complexity is high; The reflectivity of first FBG in PC encoder is fixed on 38%, and manufacture craft requires high, once reflectivity has error, will greatly change pumped FIR laser signal amplitude, affect court verdict, and 38% partial reflectance too increases encoder insertion loss; As the network user comparatively large (more than 64 users), the optical fiber between FBG inserts line and becomes longer, and coding size is larger; 3) based on delta pulse position IPPC (Incremental Puse-Positioned Code) link monitoring scheme, the program adopts the wavelength time territory coding of two dimension, distinguishes different fiber branch road according to different cavity is long.Adopting different wave length pulse only in order to improve code word correlation properties, not being used to increase code capacity further; In addition, the program is also decode to the reflected signal gathered, and reflected signal collection of illustrative plates complexity is various, and decoding coherence distance is comparatively large, and decode procedure is comparatively complicated.
Find through retrieval again, X.Zhou, the people such as X.Sun propose based on two-dimentional hop period code 2-DFHPC(2-D Frequency Hopping/Periodic Code) PON link monitoring scheme, the program has the advantages such as larger cardinality and less coherence distance, but the program is decoded to the reflected signal gathered, reflected signal collection of illustrative plates complexity is various, and coherence distance is still at the rice order of magnitude, multi-user interference probability is comparatively large, and decode procedure is comparatively complicated.Above four kinds of different codings mechanism link monitoring scheme, be all the mode adopting Random assignment light code word, code assignment of sharing the same light is to different fiber branch road, and monitoring time window ranges is larger, add code word coherence distance, reduce accuracy and the judgement efficiency of monitoring system judgement.
Summary of the invention
technical problem:the object of the invention is to for the deficiencies in the prior art, propose one and greatly reduce code word coherence distance, improve monitoring system accuracy, reliability and the survivability demand of optical access network of future generation can be met, reduce fault correction time, reduce network operation cost, promote the polling type EPON photosphere detection method based on light precoding of service quality.
technical scheme:polling type EPON photosphere checkout gear based on light precoding of the present invention, comprise direct impulse precoding module, optical circulator, wavelength division multiplexer, link failure identification module, optical line terminal equipment, feed-in optical fiber, optical branching device, distribution type fiber-optic, decoder module and user side, described direct impulse precoding module is connected with the first port of optical circulator, described link failure identification module is connected with the 3rd interface of optical circulator, second port of optical circulator is connected with the U wave band partial wave port of wavelength division multiplexer, the C-band partial wave port of wavelength division multiplexer is connected with optical line terminal equipment, the conjunction ripple port of wavelength division multiplexer is connected with the optical branching device input being positioned at distant-end node by feed-in optical fiber, the multi-channel output of optical branching device is connected with each decoder network side ports in decoder module respectively by many distribution type fiber-optics, in described decoder module, the user-side port of each decoder is corresponding with each user side respectively connects.
In apparatus of the present invention, direct impulse precoding module, link failure identification module are positioned at central office, and described decoder module is positioned at distribution type fiber-optic end.
Polling type EPON photosphere detection method based on light precoding of the present invention, comprises the following steps:
Direct impulse precoding step: direct impulse precoding module produces a two-dimentional multi-wavelength light burst signal in U wave band, this signal successively by optical circulator and wavelength division multiplexer, feed-in optical fiber laggard enter optical branching device;
Link failure identification step: described two-dimentional multi-wavelength light burst signal enters each bar distribution type fiber-optic after the light-splitting processing of optical branching device, then the decoder connected at distribution type fiber-optic end respectively carries out decoding and reflecting, and the decoded signal of reflection carries out link failure identification through distribution type fiber-optic, optical branching device, feed-in optical fiber, wavelength division multiplexer and optical circulator laggard incoming link Fault Identification module successively.
In the preferred version of the inventive method, polling type link failure detection mode is adopted in link failure identification step, be specially: a decoder corresponding two-dimentional multi-wavelength light pulse signal respectively of each bar distribution type fiber-optic end, in each detection time window, once only detect a distribution type fiber-optic link; In different detection time window, each distribution type fiber-optic link is detected one by one.
beneficial effect:compared with prior art, the present invention has the following advantages:
The present invention utilizes the direct impulse signal of precoding, adopts polling mode, once only for the optical fiber link malfunction monitoring of some targeted customers.Also polling mode is not adopted in existing technology, direct impulse signal function is to each targeted customer, and the detectable signal of reflection superposes at optical branching device place, and the reflected impulse collection of illustrative plates after superposition is comparatively complicated, interference between code word becomes large, and the detection accuracy of system declines.The present invention due to monitored branch circuit link length known, monitoring time window can significantly narrow down to very among a small circle, greatly reduces code word coherence distance, improves the accuracy of monitoring system.The present invention meets fast-developing optical access network reliability of future generation and survivability demand, reduces fault correction time, reduces network operation cost, promotes service quality, attracts more user, promotes research and development and the application of Broadband Access Network Technologies of future generation further.
Accompanying drawing explanation
Fig. 1 is checkout gear schematic diagram of the present invention;
Fig. 2 is light precoded signal decoded reflected signal collection of illustrative plates schematic diagram in embodiment.
Embodiment
Below in conjunction with embodiment and Figure of description, technical scheme of the present invention is elaborated:
Fig. 1 is the polling type EPON photosphere checkout gear schematic diagram based on light precoding, comprise direct impulse precoding module, optical circulator, wavelength division multiplexer, link failure identification module, optical line terminal equipment, feed-in optical fiber, optical branching device, distribution type fiber-optic, decoder module and user side, described direct impulse precoding module is connected with the first port of optical circulator, described link failure identification module is connected with the 3rd interface of optical circulator, second port of optical circulator is connected with the U wave band partial wave port b of wavelength division multiplexer, the C-band partial wave port a of wavelength division multiplexer is connected with optical line terminal equipment, the conjunction ripple port c of wavelength division multiplexer is connected with the optical branching device input being positioned at distant-end node by feed-in optical fiber, the multi-channel output of optical branching device is connected with each decoder network side ports A in decoder module respectively by many distribution type fiber-optics, in described decoder module, the user-side port B of each decoder is corresponding with each user side respectively connects.
Polling type EPON photosphere detection method based on light precoding of the present invention, comprises following steps:
Direct impulse precoding step: direct impulse signal of the present invention adopts U wave band transmission, to employing C-band transmission up-downgoing data transparency, does not disturb each other.Direct impulse precoding module produces a two-dimentional multi-wavelength light burst signal in U wave band, this signal successively by optical circulator and wavelength division multiplexer, feed-in optical fiber laggard enter optical branching device;
Link failure identification step: described two-dimentional multi-wavelength light burst signal enters each bar distribution type fiber-optic after the light-splitting processing of optical branching device, then carry out decoding and reflecting at the decoder that distribution type fiber-optic end connects, be positioned at user side front end respectively, at distribution type fiber-optic link end, adopt C-band transmission up-downgoing data transparent transmission, light precoded signal is decoded at the decoder of distribution type fiber-optic end.Through decoding and reflection, this light precoded signal relative position each other changes, and the decoder matched with it makes light precoded signal overlap completely in time domain, forms single hard pulse; And in other optical fiber links, decoded signal is dispersion in time domain, as shown in Fig. 2 light precoded signal decoded reflected signal collection of illustrative plates schematic diagram.The decoded signal of decoders decode and reflection carries out link failure identification through distribution type fiber-optic, optical branching device, feed-in optical fiber, wavelength division multiplexer and optical circulator laggard incoming link Fault Identification module successively.
Polling type link failure detection mode is adopted in described link failure identification step, be specially: the link failure identification module being positioned at central office, when each ONU user reaches the standard grade registration, automatically distance measurement function will be started, optical fiber link length is known, also determining known so return the detect cycle of photodissociation coded signal come, is the two-way time of this light detecting signal on PON optical fiber link, and with the length one_to_one corresponding of every bar distribution type fiber-optic link.Because the target optical fiber linkage length of detection is determined, so target acquisition time window can be narrowed down in a very little time window, in each detection time window, once only detect a distribution type fiber-optic link; In different detection time window, each distribution type fiber-optic link is detected one by one.In detection time window, after the reception of link failure identification module and signal transacting, can be adjudicated by the detectable signal that returns of pulse amplitude decision threshold to target optical fiber link, obtain the link-state information of target optical fiber branch road, as shown in Fig. 2 light precoded signal decoded reflected signal collection of illustrative plates schematic diagram.
Enumerate an embodiment below: in Fig. 1, n ONU user distributes n the precoded signal C that do not share the same light
1, C
2..., C
n.The detect cycle of every bar different distributions optical fiber link is defined as T
1, T
2..., T
n.In cycle T
1, detection of a target link 1, sends detection light precoded signal C
1decode at the end decoder of link 1, obtain the single pulse signal that multi-Wavelength Pulses time domain is superimposed, turn back to central office side line terminal equipment, and the decoder on other links cannot obtain superimposed single pulse signal because code word is not mated, shown in reflected signal collection of illustrative plates as decoded in Fig. 2 light precoded signal; Similarly, in cycle T
2, detection profile fiber link 2, sends detection light precoding direct impulse C
2, by that analogy, just polling type link detecting can be realized.
Above-described embodiment is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention; some improvement and equivalent replacement can also be made; these improve the claims in the present invention and are equal to the technical scheme after replacing, and all fall into protection scope of the present invention.
Claims (4)
1. the polling type EPON photosphere checkout gear based on light precoding, it is characterized in that, this checkout gear comprises direct impulse precoding module, optical circulator, wavelength division multiplexer, link failure identification module, optical line terminal equipment, feed-in optical fiber, optical branching device, distribution type fiber-optic, decoder module and user side, described direct impulse precoding module is connected with the first port of optical circulator, described link failure identification module is connected with the 3rd interface of optical circulator, second port of optical circulator is connected with U wave band partial wave port (b) of wavelength division multiplexer, C-band partial wave port (a) of wavelength division multiplexer is connected with optical line terminal equipment, conjunction ripple port (c) of wavelength division multiplexer is connected with the optical branching device input being positioned at distant-end node by feed-in optical fiber, the multi-channel output of optical branching device is connected with each decoder network side ports (A) in decoder module respectively by many distribution type fiber-optics, in described decoder module, the user-side port (B) of each decoder is corresponding with each user side respectively connects.
2. the polling type EPON photosphere checkout gear based on light precoding according to claim 1, it is characterized in that, described direct impulse precoding module, link failure identification module are positioned at central office, and described decoder module is positioned at distribution type fiber-optic end.
3., based on a polling type EPON photosphere detection method for light precoding, it is characterized in that, this detection method, based on device described in claim 1 or 2, comprises the following steps;
Direct impulse precoding step: direct impulse precoding module produces a two-dimentional multi-wavelength light burst signal in U wave band, this signal successively by optical circulator and wavelength division multiplexer, feed-in optical fiber laggard enter optical branching device;
Link failure identification step: described two-dimentional multi-wavelength light burst signal enters each bar distribution type fiber-optic after the light-splitting processing of optical branching device, then the decoder connected at distribution type fiber-optic end respectively carries out decoding and reflecting, and the decoded signal of reflection carries out link failure identification through distribution type fiber-optic, optical branching device, feed-in optical fiber, wavelength division multiplexer and optical circulator laggard incoming link Fault Identification module successively.
4. the polling type EPON photosphere detection method based on light precoding according to claim 3, it is characterized in that, polling type link failure detection mode is adopted in described link failure identification step, be specially: a decoder corresponding two-dimentional multi-wavelength light pulse signal respectively of each bar distribution type fiber-optic end, in each detection time window, once only detect a distribution type fiber-optic link; In different detection time window, each distribution type fiber-optic link is detected one by one.
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| CN107395269A (en) * | 2017-07-20 | 2017-11-24 | 全球能源互联网研究院 | A kind of method for arranging and monitoring device of power optical fiber power distribution communication net |
| CN107395579A (en) * | 2017-07-07 | 2017-11-24 | 中国电子科技集团公司第三十四研究所 | A kind of sampling of continuous optical signal and restoring method for photon fire wall |
| CN109617600A (en) * | 2018-12-28 | 2019-04-12 | 东南大学 | Direct impulse waveform Self-debugging system and method based on the identification of PON link failure |
| CN110518966A (en) * | 2019-09-11 | 2019-11-29 | 国网湖北省电力有限公司检修公司 | A kind of ONU positioning system and localization method based on orthogonal coding |
| WO2019233177A1 (en) * | 2018-06-07 | 2019-12-12 | 华为技术有限公司 | Method, device and system for processing passive optical network signal |
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| CN107395269B (en) * | 2017-07-20 | 2021-02-05 | 全球能源互联网研究院 | Arrangement method and monitoring device for power optical fiber distribution communication network |
| WO2019233177A1 (en) * | 2018-06-07 | 2019-12-12 | 华为技术有限公司 | Method, device and system for processing passive optical network signal |
| CN109617600A (en) * | 2018-12-28 | 2019-04-12 | 东南大学 | Direct impulse waveform Self-debugging system and method based on the identification of PON link failure |
| CN109617600B (en) * | 2018-12-28 | 2020-09-15 | 东南大学 | Detection pulse waveform self-debugging system and method based on PON link fault recognition |
| CN110518966A (en) * | 2019-09-11 | 2019-11-29 | 国网湖北省电力有限公司检修公司 | A kind of ONU positioning system and localization method based on orthogonal coding |
| CN110518966B (en) * | 2019-09-11 | 2020-10-13 | 国网湖北省电力有限公司检修公司 | ONU positioning system and positioning method based on orthogonal coding |
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