WO2013017302A1 - Procédé et système utilisant des systèmes de réflectométrie pour surveiller une couche physique dans des réseaux optiques passifs point à multipoint - Google Patents

Procédé et système utilisant des systèmes de réflectométrie pour surveiller une couche physique dans des réseaux optiques passifs point à multipoint Download PDF

Info

Publication number
WO2013017302A1
WO2013017302A1 PCT/EP2012/057906 EP2012057906W WO2013017302A1 WO 2013017302 A1 WO2013017302 A1 WO 2013017302A1 EP 2012057906 W EP2012057906 W EP 2012057906W WO 2013017302 A1 WO2013017302 A1 WO 2013017302A1
Authority
WO
WIPO (PCT)
Prior art keywords
pon
light signal
monitoring
optical
filters
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2012/057906
Other languages
English (en)
Inventor
Julio MONTALVO GARCÍA
José Alfonso TORRIJOS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonica SA
Original Assignee
Telefonica SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonica SA filed Critical Telefonica SA
Publication of WO2013017302A1 publication Critical patent/WO2013017302A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/071—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
    • G01M11/3109—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR
    • G01M11/3127—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR using multiple or wavelength variable input source
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/31—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter and a light receiver being disposed at the same side of a fibre or waveguide end-face, e.g. reflectometers
    • G01M11/3109—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR
    • G01M11/3136—Reflectometers detecting the back-scattered light in the time-domain, e.g. OTDR for testing of multiple fibers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0083—Testing; Monitoring

Definitions

  • the present invention generally relates, in a first aspect, to a method for physical layer monitoring in point to multipoint Passive Optical Networks (PONs) based on reflectometry systems, comprising emitting light to the interior of a PON and analysing the light reflected at different points of the PON, and more particularly to a method which allows discerning the branch of the PON where the light reflected comes from based on a filtering process of said emitted light performed in said points of the PON.
  • PONs Passive Optical Networks
  • a second aspect of the invention relates to a system arranged for implementing the method of the first aspect.
  • Fibre-to-the-x H for home, B for building, C for curb and N for node
  • FTTx, x H for home, B for building, C for curb and N for node
  • OPEX cost of operation and maintenance
  • PS power splitters
  • the optimal situation to reduce the cost of a supervision system is to perform the measurements from the central office (CO), where all the feeder fibres of the FTTx PONs start.
  • the feeder fibres 5 connect the CO with the outside plant and to all the customer premises, so the central office is a strategic point from where any problem in the fibre access network could be detected, identified or located.
  • an OTDR (1 ) is shared among several OLT PON ports (3) (including overlay signals) through a Fibre Optic Cross-connect System (2) (FOCS), which switches the OTDR port to the corresponding input port of the passive stage with WDM filters (4).
  • the OTDR signal is delivered to the Outside Plant through the feeder fibre (5), where typically the point to multi-point optical fibre structure is formed by using first level (6) and second level (8) splitters, with splitting ratios of 1xm and 1xn, respectively.
  • the distribution section of the typical PON is built using the distribution fibres (71 ...7m) connecting the two splitting levels, and finally the drop section of the PON is connected to the customer premises ONTs (9) through mxn drop fibres (91 1...9mn).
  • OTDRs are equipment designed to test the complete length of a single optical fibre, capable of locating in distance both attenuation and reflection events. By transmitting a train of periodical high power optical pulses into a fibre cable and analyzing in time the Fresnel and Rayleigh reflected signals, OTDRs can obtain a trace along of the optical fibre. Nevertheless, OTDRs are designed for point-to-point fibre links, so they cannot distinguish the events coming from different output fibres after an optical power splitter in a branched FTTx PON, because the reflections from the different distribution fibres are overlapped in time.
  • the invention [9] provides a method and apparatus for determining a failure of an Optical Network Unit (ONU) before a PON system failure occurs, by collecting and analyzing the monitoring information from both the Optical Line Terminal (OLT) and the ONU. Nevertheless, this invention is not capable of directly obtaining physical-layer information of the PON nor identifying the exact fault location.
  • polarization dependent components are installed before and after the drop fibres in the PON.
  • OTDR pulses with controlled polarization states, associated with each polarization marker, are used as the basis for distinguishing the branches from one another.
  • the complexity of the signal analysis and processing for this technique, as well as the complexity of fabricating and managing a large number of polarization marked components in the outside plant at low cost, are the main drawbacks of this technique. No successful demonstration of this approach has been published in the past ten years.
  • the proposal [12] describes a method for individual and full-length supervision of PON fibres using tunable OTDRs. It is based on a complete deployment of a WDM- PON structure installing optical multiplexer/demultiplexers in parallel to the power splitters of the legacy PON, requiring cyclic performance of the first level optical mux/demuxes (option 2). Even though the supervision of the PON can be achieved with high sensitivity, the number and cost of the elements and modifications required in the outside plant are higher and more complex than in the present invention, which only uses in-series filters at each output port of the previously existing components in the outside plant.
  • wavelength plan and maximum number of drop fibres of this previous patent strongly depends on the current technology of the cyclic filters and its evolution, while this new invention can use out-of-the shelf optical components with low cost and no limitation in the wavelength plan, just using one or more available subbands not being used for PON data transmission.
  • the present invention provides, in a first aspect, a method for physical layer monitoring in point to multipoint passive optical networks based on reflectometry systems, comprising:
  • optical means provided at different points of said PON, at least part of said monitoring light signal, in the form of respective reflected light signals;
  • a second aspect of the present invention concerns to a system for physical layer monitoring in point to multipoint passive optical networks based on reflectometry systems, comprising:
  • a light source arranged to inject a monitoring light signal at an input of a PON to circulate there through
  • At least one power splitter which equally splits said monitoring light signal into splitted signals, each to be sent to one of different branches of said PON;
  • said light source injecting said monitoring light signal together with at least one data light signal by means of a global light signal at said input of said PON;
  • the system of the second aspect of the invention is adapted to implement the method of the first aspect.
  • Figure 1 shows the current generic point to multipoint PON architecture based on power splitters.
  • Figure 2 shows a current schematic of an OTDR supervision system for PONs and the different sections of a general PON architecture.
  • Figure 3 shows the current wavelength plan for PON and XG-PON systems.
  • Figure 4 shows the proposed physical layer supervision system.
  • Figure 5 shows the structure of the modified first level splitters using optical multi-passband filters in series with distribution and drop fibres, according to an embodiment of the present invention.
  • Figure 6 shows the structure of the modified second level splitters using optical multi-passband filters in series with distribution and drop fibres, according to an embodiment of the present invention.
  • Figure 7 shows the individual supervision of feeder and distribution fibres using the modified first level splitters, according to an embodiment of the present invention.
  • Figure 8 shows the wavelength plan for the proposed monitoring system.
  • Figure 9 shows the monitoring subband assignment for first level splitters for the proposed invention.
  • Figure 10 shows the individual supervision of drop fibres using the modified second level splitters, according to an embodiment of the present invention.
  • Figure 1 1 shows the monitoring wavelength assignment for drop fibres for the proposed invention.
  • Figure 12 shows a first level splitter with multi-passband optical filter implementation using circulators and WDM reflectors, according to an embodiment of the present invention.
  • Figure 13 shows a second level splitter with multi-passband optical filter implementation using circulators and WDM reflectors, according to an embodiment of the present invention.
  • Figure 14 shows a first level splitter with multi band-suppression optical filter implementation using in-series reflectors, according to an embodiment of the present invention.
  • Figure 15 shows a second level splitter with multi band-suppression optical filter implementation using in-series reflectors, according to an embodiment of the present invention.
  • the present invention consists of a centralized OTDR measurement system to remotely obtain the individual characterization of each fibre in a FTTx point-to-multipoint PON all along its length. Therefore, the defined system is aimed at locating exactly the point of a fibre defect, such as an attenuation or break, from the central office of the PON.
  • This invention is relevant in the field of optical access networks with point-to- multipoint physical topology built of power splitters in the outside plant, such as GPON, EPON, 10G-GPON, 10G-EPON, and any future NG-PON system that uses part of or the complete fibre infrastructure of the former PONs.
  • the conceived system consists of an OTDR with tunable operating wavelength, and optical multi-passband filters in the remote/s node/s of the PON system. It does not require the installation of any component at the ONT side of each drop fibre.
  • OTDR operating wavelength must be tunable within an optical band reserved for monitoring purposes and available in the PON system under supervision.
  • Figure 3 it was shown the generic wavelength plan for PON and 10G-PON systems with optional video overlay services and maintenance band as defined by ITU-T L.66. Even though the water peak region has been usually avoided for data transmission due to the water peak attenuation of single mode fibre, this band can be useful for physical layer monitoring purposes. WDM techniques are only used for the OTDR measurements, maintaining the power splitting nature of the PON for data transmission.
  • fibre-optic cross-connect systems can be used in order to consecutively switch the OTDR signal to the different PON feeder fibres.
  • the invention relies on the use of in-series multi-passband and multi-band- suppression filters at the output ports of the PON power splitters which let the PON and/or NG-PON data transmission signals travel as well as a single optical subband or wavelength for each distribution and drop fibres of a PON for monitoring purposes, thus assigning a specific optical subband and wavelength for individually OTDR monitoring of optical fibres.
  • the system is designed in such a way that a single monitoring pulse does not travel through more than one fibre in parallel, thus avoiding the superposition of the backscattering of the OTDR monitoring signals coming from the rest of the fibres that exist in the PON.
  • the specific passbands of the optical filters included in the first-level (60) and second level (81 ..8m) modified power splitters behave as power splitters for the PON data transmission signals but use different passband ranges for the monitoring signals.
  • the tunability capacity of the OTDR (10) located in the Central Office within the reserved monitoring optical band/s. Thanks to this capacity the OTDR is able to send a monitoring pulse using a wide range of wavelengths, typically one per PON customer.
  • the system is designed so that, for a fixed operating wavelength of the pulses launched by the Tunable OTDR (T-OTDR) (10), these pulses travel through the feeder fibre (5), a single fibre (71..7m) - being m the number of fibre outputs of the first-level modified splitter (60) - of the distribution section, and a single fibre (91 1..9mn) - being n the number of fibre outputs of the second-level modified splitters (81 ..8m) - of the drop section, thus supervising a single fibre link from the OLT to a specific ONT and avoiding the superposition of reflections from different branches at the OTDR receptor.
  • T-OTDR Tunable OTDR
  • FIG. 5 it was represented a modified first-level splitter (60) connected to a feeder fibre (5) with m outputs (71 ..7m), composed by a generic power splitter (6) with m outputs, where each output is connected in series with different special filters (21..2m) in charge of blocking all monitoring wavelengths except the wavelengths assigned to the subband of the specific distribution fibres (71..7m) used.
  • a monitoring pulse using A1 1 wavelength assigned to the subband 1 it is divided by the power splitter (6) and suppressed in all special filters (22..2m), allowing passing this wavelength only though the special filter (21 ).
  • FIG 6 it was represented a modified second-level splitter (8j) connected to a distribution fibre (71..7m) with n outputs (9j1..9jn), composed by a generic power splitter (8j) with n outputs, where each output is connected in series with different special filters (4j1 ...4jn) in charge of blocking all monitoring wavelengths except the wavelength assigned to the specific drop fibre (9j1..9jn) used.
  • a monitoring pulse using Aj1 wavelength it is divided by the power splitter (8j) and suppressed in all special filters (4j2..4jn), allowing passing this wavelength only through the special filter (4j1 ).
  • the power splitting nature is kept because the special filters are installed in series with the output fibres of the splitters.
  • the general wavelength plan design criteria consists of letting pass just part of the monitoring signal through each output port of the splitter, being a different part or this signal from the other output ports.
  • the T-OTDR receives only the reflections of this distribution fibre (71 ), and thus the individual characterization of the complete length of this distribution fibre is obtained, while the data transmission with video overlay or any other data services are delivered to all the distribution fibres (71 ..7m).
  • the operation wavelength of the tunable OTDR (10) was tuned to a different value, the corresponding fibre characterization is achieved.
  • the illustration of the monitoring of the distribution fibre (7m) was shown in Figure 7 (b).
  • the WDM (4) passband must include all the OTDR operating wavelengths, so the feeder fibre (5) characterization is always obtained.
  • the modified splitter (60) behaves like a typical power splitter for the rest of the signals other than OTDR monitoring pulses.
  • the T-OTDR (10) must be able to select a single operating wavelength at a time for monitoring the complete optical path from the CO to a specific ONT.
  • Monitoring wavelengths are grouped into several subbands, as shown in Figure 8, where a subband is needed per each distribution fibre and a specific monitoring wavelength is needed per individual drop fibre (91 1..9nm) in the PON system. No specific numerical values are assigned to monitoring wavelengths in order to allow flexibility to the system. The only restriction is that no overlapping between monitoring and data and overlay signals takes place in the PON.
  • the monitoring subbands are related to the distribution fibres.
  • the first output of the modified splitter (60) corresponds to the distribution fibre (71 ) and this fibre is related to the subband 1
  • the second output corresponds to the distribution fibre (72) and this fibre is related to the subband 2 and so on up to the last output which corresponds to the distribution fibre (7m) and this fibre is related to the subband m.
  • FIG 10 (a) it was represented a specific tunable OTDR (10) pulse using Aj1 wavelength coming from distribution fibre (7j) that reaches to a generic second-level splitter (8j) that routes the monitoring pulse only to the output (9j1 ), providing the data and video signals in all outputs (9j1...9jn).
  • the monitoring pulse uses another wavelength, for example Ajn wavelength as shown in Figure 10 (b)
  • the second-level splitter (8j) routes the monitoring pulse only to the output (9jn), providing also the data and video signals in all outputs (9j1 ...9jn).
  • the transmission characteristics of the multi-passband filters must include the corresponding monitoring subbands or wavelengths, as assigned in the designed monitoring system, in both directions of signals propagation, downstream and upstream.
  • the transmission characteristics of the multi-passband filters in downstream direction must also include the wavelengths of the PON and/or NG-PON downstream data signals, and the wavelengths of the PON and/or NG-PON upstream data signals in the upstream direction.
  • Out-of-the-shelf passive components either in thin-film-filter (TFF) technology, optical multiplexer-demultiplexers, or Fibre Bragg Gratings and optical circulators can be used to build the passband filters with the desired transmission characteristics.
  • TNF thin-film-filter
  • optical multiplexer-demultiplexers optical multiplexer-demultiplexers
  • Fibre Bragg Gratings and optical circulators can be used to build the passband filters with the desired transmission characteristics.
  • FIG. 12 A possible implementation of the first level modified splitter (60) with multi- passband filters (21...2m) using WDM reflectors and optical circulators (630) was shown in Figure 12.
  • Optical circulators (630) operating both at the monitoring and data signals deliver all the signals coming from the splitter (6) to the line of WDM reflectors.
  • the reflectors (61 1 ) and (620) send back the OTDR monitoring subband with wavelengths ⁇ 1 1 ... ⁇ 1 ⁇ and the PON and/or NG-PON downstream signals (ADS, A ng ) again to the optical circulator and this to the output fibre (71 ). Any other wavelength will be blocked and lost from the tunable OTDR point of view.
  • this filter implementation (21 ) is transparent.
  • FBG Fibre Bragg Gratings
  • TDF Thin Film Filters
  • the optical filters (21 ...2m) functionality is achieved by reflecting the desired optical signals (PON data, overlay and assigned monitoring signal/s) into the PON, so that the scattering of the propagating monitoring signal which is selected is used to analyze the physical status of the specific fibre related to the monitoring wavelength or subband.
  • Another implementation is possible by using the reflections to avoid the propagation of the monitoring signals which do not correspond to the fibre under test, thus only letting the desired signal travel through the fibre under test.
  • the in-line filters (21 ...2m) are built with reflective or suppression filters, used to reject the undesired subbands, rather than to let them travel through the fibres under test, as in option 1 .
  • filter (21 ) is considered a multi band-suppression filter, as shown in Figure 14.
  • the signal is divided and delivered to all the filters (21..2m).
  • the signal will travel through fibre (71 ).
  • the signal at the subband ⁇ 1 will be reflected or suppressed.
  • the OTDR in the central office will detect the reflections of the undesired signals at the 2j filters (j ⁇ 1 in this example), and most importantly, the OTDR will detect the scattering reflection as the signal at the subband ⁇ 1 will travel through fibre (71 ), thus characterizing its full fibre length in an individual manner.
  • the implementation of the second or additional levels follows the same idea, which is reflecting or suppressing the undesired signals over the monitoring subband and let to travel through the fibre under test only a specific monitoring sub-band or wavelength, which is analyzed in the OTDR at the central office to characterize the full length of the fibre under test.
  • the only wavelength which is not reflected back nor suppressed is Aj 1 , then the monitoring wavelength will travel through fibre (9j1 ) and it will be characterized in the OTDR at the central office.
  • the monitoring wavelength Aj 1 will be reflected back or suppressed, and the OTDR will only detect a peak reflection at the splitter (if reflected) or nothing (if suppressed).
  • the only fibre that will be characterized all along its length will be (9j1 ).
  • multi band-suppression filters can be achieved by building Fibre Bragg Gratings in series with high reflectivity or using Thin Film Filters.
  • This invention applies to FTTx topologies for PON systems with power splitters in the outside plant, and enables the physical supervision of the network independently of active data equipment, reducing the operational expenditures (OPEX) of the network operator.
  • This invention permits individual fibre supervision of a complete optical distribution network of a point to multipoint PON with one or more levels of splitting, all along a specific fibre length, even for fibres at the drop section of the PON.
  • This invention avoids the restrictions of reflections superposition in previous reflectometric solutions for power splitter PONs.
  • This invention allows the exact location of a fibre fault in a power splitter based
  • This invention does not need for reflective filters at the ONT side, thus avoiding installation of additional elements at the customer premises or at demarcation points.
  • This invention uses a reduced number of out-of-the shelf low cost mature optical components with flexible installation and wavelength assignment in the operator's fibre outside plant.
  • ITU-T L.66 Optical fibre cable maintenance criteria for in service fibre testing in access networks. 2007.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Electromagnetism (AREA)
  • Signal Processing (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Optical Transform (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention concerne un système qui comprend: une source lumineuse, qui injecte un signal lumineux de surveillance ainsi qu'au moins un signal lumineux de données au moyen d'un signal lumineux global, à une entrée d'un réseau optique passif (PON); un diviseur de puissance, qui divise ledit signal lumineux global en une pluralité de signaux sous-globaux; et une pluralité de filtres, connectés chacun entre une sortie du diviseur de puissance et une branche respective dudit PON, chacun de ces filtres permettant le passage du signal ou des signaux lumineux de données et d'une longueur d'onde unique, ou d'un ensemble de longueurs d'onde dudit signal lumineux de surveillance, afin de produire un signal lumineux sous-global filtré. Le procédé est conçu pour utiliser le système de surveillance de couche physique dans des PON.
PCT/EP2012/057906 2011-07-29 2012-04-30 Procédé et système utilisant des systèmes de réflectométrie pour surveiller une couche physique dans des réseaux optiques passifs point à multipoint Ceased WO2013017302A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ESP201131332 2011-07-29
ES201131332 2011-07-29

Publications (1)

Publication Number Publication Date
WO2013017302A1 true WO2013017302A1 (fr) 2013-02-07

Family

ID=46026807

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/057906 Ceased WO2013017302A1 (fr) 2011-07-29 2012-04-30 Procédé et système utilisant des systèmes de réflectométrie pour surveiller une couche physique dans des réseaux optiques passifs point à multipoint

Country Status (2)

Country Link
AR (1) AR087319A1 (fr)
WO (1) WO2013017302A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014159985A (ja) * 2013-02-19 2014-09-04 Nippon Telegr & Teleph Corp <Ntt> 光線路特性解析装置及びその解析方法
WO2015055864A1 (fr) * 2013-10-18 2015-04-23 Telefónica, S.A. Procédé, système et dispositif pour la supervision de fibres optiques
JP2018157247A (ja) * 2017-03-15 2018-10-04 富士通株式会社 障害検出装置および障害検出方法
JP2023532110A (ja) * 2020-06-30 2023-07-26 華為技術有限公司 スプリッタ、光分配ネットワーク、および光フィルタ構造に対応する波長を決定する方法
WO2025039637A1 (fr) * 2023-08-18 2025-02-27 华为技术有限公司 Système de réseau optique et dispositif de division optique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6396575B1 (en) 2000-05-31 2002-05-28 Lucent Technologies Inc. Test and measurement system for detecting and monitoring faults and losses in passive optical networks (PONs)
US20090263123A1 (en) * 2008-04-21 2009-10-22 Oplink Communications, Inc. Fiber network monitoring
US20090269053A1 (en) 2007-04-26 2009-10-29 Huawei Technologies Co., Ltd. Method and apparatus for detecting passive optical network failures, and passive optical network system thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6396575B1 (en) 2000-05-31 2002-05-28 Lucent Technologies Inc. Test and measurement system for detecting and monitoring faults and losses in passive optical networks (PONs)
US20090269053A1 (en) 2007-04-26 2009-10-29 Huawei Technologies Co., Ltd. Method and apparatus for detecting passive optical network failures, and passive optical network system thereof
US20090263123A1 (en) * 2008-04-21 2009-10-22 Oplink Communications, Inc. Fiber network monitoring

Non-Patent Citations (10)

* Cited by examiner, † Cited by third party
Title
"Institute of Electrical and Electronics Engineers (IEEE", IEEE 802.3AH. ETHERNET IN THE FIRST MILE (EPON, 2004
ARII; MASAHITO; IZUMITA; HISASHI; YAMAUCHI, OSAMU. S.L.: MEASUREMENT SCIENCE AND TECHNOLOGY, vol. 17, 2006
CAVIGLIA F.; DI BIASE V., 24TH EUROPEAN CONFERENCE ON OPTICAL COMMUNICATIONS (ECOC, vol. 1, 1998, pages 621 - 625
CHEN W. ET AL., EINDHOVEN : PROC. SYMP. IEEE/LEOS BENELUX CHAPTER, 2006, pages 13 - 16
DAISUKE ET AL., 5, S.L. : JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 25, 2007
ENBUTSU K. ET AL., SIDNEY : PROC. OPTO-ELECTRON. AND COMM. CONF., 2008
FATHALLAH H.; IZUMITA H.; ITO F., 7, S.L. : JOURNAL OF OPTICAL NETWORKING, vol. 6, 2007, pages 819 - 829
ITU-T L.66: OPTICAL FIBRE CABLE MAINTENANCE CRITERIA FOR IN SERVICE FIBRE TESTING IN ACCESS NETWORKS, 2007
NAKAO N. ET AL., 10, S.L. : JOURNAL OF LIGHTWAVE TECHNOLOGY, vol. 19, 2001, pages 1513 - 1520
YÜKSEL K. ET AL., 9, S.L. : ELECTRONICS LETTERS, vol. 41, 2005, pages 546 - 547

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014159985A (ja) * 2013-02-19 2014-09-04 Nippon Telegr & Teleph Corp <Ntt> 光線路特性解析装置及びその解析方法
WO2015055864A1 (fr) * 2013-10-18 2015-04-23 Telefónica, S.A. Procédé, système et dispositif pour la supervision de fibres optiques
US9735866B2 (en) 2013-10-18 2017-08-15 Telefonica, S.A. Method, system and device for the supervision of optical fibres
JP2018157247A (ja) * 2017-03-15 2018-10-04 富士通株式会社 障害検出装置および障害検出方法
JP2023532110A (ja) * 2020-06-30 2023-07-26 華為技術有限公司 スプリッタ、光分配ネットワーク、および光フィルタ構造に対応する波長を決定する方法
JP7557556B2 (ja) 2020-06-30 2024-09-27 華為技術有限公司 スプリッタ、光分配ネットワーク、および光フィルタ構造に対応する波長を決定する方法
WO2025039637A1 (fr) * 2023-08-18 2025-02-27 华为技术有限公司 Système de réseau optique et dispositif de division optique

Also Published As

Publication number Publication date
AR087319A1 (es) 2014-03-12

Similar Documents

Publication Publication Date Title
Yuksel et al. Optical layer monitoring in passive optical networks (PONs): a review
US20140072296A1 (en) Method and a system for physical layer monitoring in passive optical networks
Esmail et al. Physical layer monitoring techniques for TDM-passive optical networks: A survey
Rad et al. Passive optical network monitoring: challenges and requirements
Urban et al. Fiber plant manager: An OTDR-and OTM-based PON monitoring system
US8693866B1 (en) Fiber diagnosis system for WDM optical access networks
US7800744B2 (en) Detection system for identifying faults in passive optical networks
Fathallah et al. Code-division multiplexing for in-service out-of-band monitoring of live FTTH-PONs
EP2337240B1 (fr) Module WDM-PON multicanaux avec fonction OTDR intégrée
EP2726837B1 (fr) Dispositif, noeud à distance et procédés pour supervision de pon.
WO2008116309A1 (fr) Procédé et système de détection dans de défauts dans un réseau optique à trajet multiple
US20150023658A1 (en) System, a wavelength isolator and methods therein for supervision of a passive optical network
WO2013017302A1 (fr) Procédé et système utilisant des systèmes de réflectométrie pour surveiller une couche physique dans des réseaux optiques passifs point à multipoint
Maier Survivability techniques for NG-PONs and FiWi access networks
ES2417954B1 (es) Método y sistema para supervisar redes ópticas pasivas punto a multipunto basadas en sistemas de reflectometría
Zhang et al. Remote coding scheme using cascaded encoder for PON monitoring
JP5066555B2 (ja) 光線路障害探索装置
Montalvo et al. Radio-frequency self-referencing system for monitoring drop fibres in wavelength division multiplexing passive optical networks
Urban et al. Cost-efficient remote PON monitoring based on OTDR measurement and OTM functionality
US9544669B2 (en) Routing in a WDM-based PON
Chen et al. Fast fault monitoring technique for reliable WDM PON: Achieving significant operational saving
Zhang et al. Optimal Matching Approach for Cascaded Encoder in Remote Coding Scheme-based Passive Optical Network Monitoring System
Cen Study on supervision of wavelength division multiplexing passive optical network systems
Cen et al. A full monitoring scheme for long-reach TWDM PONs
Naim et al. Passive optical access network monitoring using L-band ASE source with fiber Bragg grating

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12718647

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12718647

Country of ref document: EP

Kind code of ref document: A1