EP4186179A1 - Surveillance de trafic non intrusive dans des réseaux de fibres optiques - Google Patents

Surveillance de trafic non intrusive dans des réseaux de fibres optiques

Info

Publication number
EP4186179A1
EP4186179A1 EP21748670.3A EP21748670A EP4186179A1 EP 4186179 A1 EP4186179 A1 EP 4186179A1 EP 21748670 A EP21748670 A EP 21748670A EP 4186179 A1 EP4186179 A1 EP 4186179A1
Authority
EP
European Patent Office
Prior art keywords
previous
reading
fiber
photodiode
optical
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.)
Pending
Application number
EP21748670.3A
Other languages
German (de)
English (en)
Inventor
António José BISCAIA FRANCO
Luis João DO ROSÁRIO FERREIRA RIBEIRO DE CARVALHO
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.)
Nos Technology Concepcao Construcao E Gestao De Redes De Comunicacoes SA
Original Assignee
Nos Technology Concepcao Construcao E Gestao De Redes De Comunicacoes 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 Nos Technology Concepcao Construcao E Gestao De Redes De Comunicacoes SA filed Critical Nos Technology Concepcao Construcao E Gestao De Redes De Comunicacoes SA
Publication of EP4186179A1 publication Critical patent/EP4186179A1/fr
Pending 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
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • 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
    • G01M11/35—Testing of optical devices, constituted by fibre optics or optical waveguides in which light is transversely coupled into or out of the fibre or waveguide, e.g. using integrating spheres
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4287—Optical modules with tapping or launching means through the surface of the waveguide
    • G02B6/4289—Optical modules with tapping or launching means through the surface of the waveguide by inducing bending, microbending or macrobending, to the light guide

Definitions

  • the present invention describes a real-time monitoring system for passive optical fiber networks for use under DWDM, GPON, XGPON, technologies, or others, in a permanent and non-intrusive manner.
  • Document US5708499 discloses a device which may be used to detect the presence of light in optical fibers in a unique manner while the optical fiber is in use, or to introduce light into an optical fiber.
  • the device includes an identifier chip, and an associated complementary shaped plate, each of which employ both microbending and macrobending portions.
  • the chip and the plate are formed by a single piece of material, although only the chip must be formed of an optically transmissive material. In use, the chip is pressed in the direction of the plate with an optical fiber therebetween. The deformation of the fiber caused by the stress exerted by the chip and the plate will cause detectable light to be emitted through the chip if the fiber is alive.
  • the present application describes a non-intrusive optical fiber traffic monitoring system, characterized by comprising at least one reading module comprising an upper surface comprising a compression boss, and a lower surface comprising a rear retention array and a front retention array for fixation of the fiber; and at least one printed circuit board, physically adapted and installed in the reading module, making a signal available at the exit thereof; at least one multiplexer linked to the exit of the referred at least one channel, combining the signals originating therefrom; at least one processing unit, adapted to receive, treat and retransmit the combined signals originating from at least one multiplexer; wherein the upper surface by the action of the mechanical union with the lower surface and of the compression boss, compresses the optical fiber placed between the rear retention array and the front retention array.
  • the at least one reading channel comprises an ascending reading channel and a descending reading channel.
  • the at least one processing unit comprises a bidirectional data storage and communication system.
  • the reading module comprises at least one of at least one battery and/or at least one external power supply to guarantee the working of the referred module.
  • the at least one external power supply comprises at least one electric power supply and/or one supply originating from the electro-magnetic field generated by the bidirectional data communication.
  • the ascending reading channel comprises a photodiode, an amplifier and a schmitt trigger logic gate.
  • the descending reading channel comprises a photodiode, an amplifier and a schmitt trigger logic gate.
  • the photodiode of the ascending reading channel is installed in the proximity of the rear retention array and the photodiode of the descending reading channel is installed in the proximity of the front retaining array.
  • the photodiode of the ascending reading channel captures the ascending signal flow in the interior of the fiber and the photodiode of the descending reading channel captures the descending signal flow in the interior of the fiber.
  • the reading channel comprises an antenna that is interconnected to the processing unit to optimize the reception of electric energy and the transmission of data by means of the bidirectional data communication.
  • the reading module comprises the use of a physical system for visualizing the traffic flow inside the core of the fibers to be monitored.
  • the bidirectional data communication comprises the use of at least one of NFC and/or RFID and/or Bluetooth technology and/or another technically suitable.
  • system further comprises a user equipment equipped with NFC and/or RFID and/or Bluetooth technology and/or other that is technically suitable to carry out the bidirectional data communication with the processing unit in the reading module.
  • the user equipment is technically adapted to carry out the energy supply for the reading module.
  • the user equipment is adapted to receive the information from the at least one intended reading channel, identifying whether the data flow in the interior of the fiber is a descending, ascending, ascending and descending, or without optical signal.
  • the reading module is physically adaptable to any type of equipment existing in an optical fiber network, namely OLT (Optical Line Terminal), ONT (Optical Network Terminal), ODF (Optical Distribution Frame), joints, distribution points, among others.
  • OLT Optical Line Terminal
  • ONT Optical Network Terminal
  • ODF Optical Distribution Frame
  • joints distribution points
  • the compression in the optical fiber caused by the compression boss introduces insertion losses lower than ldB.
  • the photodiodes guarantee the reading of a range of wavelength values comprised between 1300nm and 1600nm.
  • the compression in the optical fiber caused by the compression boss causes a radius of curvature in the fiber which comprises values between 6mm and 15mm, in a preferred embodiment having 9mm.
  • the compression boss comprises a width of 3mm and a height of 2mm relative to the face of the upper surface, introducing a compression having sensitively 1mm height in the fiber, and, the distance between the rear retention array and the front retention array is sensitively 12mm.
  • Ihe present invention describes a real-time monitoring system for passive optical fiber networks for use under Dense Wavelength Division Multiplexing (DWDM), Gigabit Passive Optical Networks (GPON), Ten-Gigabit Passive Optical Networks (XGPON), or other, in a permanent and non-intrusive manner.
  • DWDM Dense Wavelength Division Multiplexing
  • GPON Gigabit Passive Optical Networks
  • XGPON Ten-Gigabit Passive Optical Networks
  • the system developed allows, in a non-limitative manner, the bidirectional real-time monitoring of at least 12 optical channels simultaneously.
  • the user may visually validate the working state of at least one optical fiber, by means of the visual indication present in the reading module, or by means of the user device by means of an APP specifically developed for this purpose, thus determining whether this fiber, or fibers, is connected to the active equipment and with the flow of traffic running through its core.
  • This operation is carried out without existing the need to turn off connectors and/or resort to more burdensome and intrusive procedures, not only for the passive optical network (PON), but also for the final users of the service.
  • PON passive optical network
  • the bidirectional monitoring is guaranteed by means of the use of a double sensor for simultaneous measurement of the flow of traffic in both directions of the fiber core under analysis.
  • the monitoring system developed is formed by two components, one reading module and a user equipment for reception and presentation of the information.
  • the working principle of the system developed is based on the concept of optical fiber macrocurvature (FO), which allows deforming a fiber core and extracting a small part of the optical signal present in the FO, in case this is connected to an active emitter and/or receptor equipment, enabling this fraction of removed signal to be subsequently detected by means of the photodiodes installed in the reading module created and adapted for this effect.
  • FO optical fiber macrocurvature
  • the technological resource used for the validation of the working state of the optical fibers is grounded on the use of a smartphone or tablet, or other, technically adapted, armed with Near Field Communication (NFC) technology and with a native application for reading tags NFC.
  • NFC Near Field Communication
  • the technology used for the communication between the reading module and the user equipment is not exclusive to the NFC, whereby there may be used the Radio-Frequency IDentification (RFID), Bluetooth, or other type of technology with identical working characteristics, allowing unlimited and independent autonomy, without the need to consume energy in a passive manner.
  • RFID Radio-Frequency IDentification
  • the energy supply of the reading module in a non-exclusive and limitative manner, is characterized by presenting modularity according to the need of the user or final operator, and may be carried out by resorting to batteries or local accumulators in the referred module, as well as using local energy supplies.
  • This modularity and adaptability to the client's installation needs enables, and in case of need or limitation of the installation location, resorting to the energy transfer system.
  • the permanent installation of the reading module in the equipment which it is intended to monitor, for example, and in a non-limitative manner, in an Optical Distribution Frame (ODF), allows that, together with the use of the smartphone in the proximity of the referred equipment, it is possible to determine the working state of the fibers, by means of a rapid reading or observation on the part of the user, not being necessary the installation and/or use of costly additional equipment and which is difficult to adapt for carrying out this task, thus minimizing the checking times of these operations.
  • ODF Optical Distribution Frame
  • the detection of the optical signal present in the FO is reached by means of the extraction of a fraction of light, inputed by the active network equipment, and which traverses the core, not existing the need to interrupt the existing connection.
  • active fibers with optical signal
  • inactive fibers without optical signal
  • Part of the light which propagates in the FO can be removed applying a slight curvature in the fiber, providing a deformation in the core, allowing part of the light to exit by the insulating sheath.
  • the curvature can be slight (microcurvature) or accentuated (macrocurvature) according to the need of the signal to be extracted. Whereby the smaller the curvature radius plus signal that is extracted from the fiber, however, the larger will be the insertion losses, that is, the larger will be the attenuation of the connection.
  • the microcurvature technique was excluded from the development process since the FO used presented a PVC coating which renders unviable the correct detection of the signal.
  • the adopted solution is grounded on the macrocurvature technique which consists in applying a slight curvature to the fiber to deform the core, and allow that part of the optical power be extracted.
  • Dispersion-shifted fibers which have a modified wave dispersion guide. These are fibers where the refractive index of the core is altered, to ally the benefits of the wavelengths of 1310nm and 1550nm.
  • Insertion Loss (IL) is translated into the relation between the input power and the output power of the fiber, which is given by:
  • the derivation loss means the relation between the inserted power and the extracted power.
  • the derivation loss can be obtained indirectly by means of the IL, assuming that the losses result essentially from the power extracted from the fiber, that is,
  • the power detected by the photodiodes is a small part of the extracted power, from the active area of the photodiode, the angle and the relative location between the fiber and the photodiode. In order to simplify the problem, all the factors are aggregated in a b parameter which will be empirically determined, being preferably maximized. Therefore, the power P d detected is given by
  • the reading module comprises the use of photodetectors to determine the FO with active signal.
  • the PIN photodiode is a photodiode having an intrinsic layer placed between the type P and N material. Ideally a PIN photodiode should generate an electron hole pair in the depletion region for each incident photon. However, in practice this is not observed.
  • the efficiency of the optical- electric conversion designated by quantum efficiency (Quantum efficiency) is lower than 100%.
  • Another parameter used to characterize the photodiodes is the responsivity, Rx, which relates the electric current at the exit of the photodiode, I p , with the incident optical power, P, wherein
  • APD avalanche photodiode
  • PIN avalanche photodiode
  • M the multiplication factor by avalanche, which typically can vary between 10 and 100.
  • the wavelengths used in the Gigabit Passive Optical Network (GPON) and Synchronous Digital Hierarchy (SDH) networks are between 1310nm and 1550n
  • the most suitable photodiodes are those with intrinsic layer Indium gallium arsenide (InGaAs) which has a responsivity higher than 60% between 1200nm and 1700nm.
  • InGaAs Indium gallium arsenide
  • the choice of the most suitable photodiode for the effect resulted in a reading range covered between the 1300nm and the 1600nm.
  • it is possible to obtain an agnostic measurer allowing to carry out and obtain optical power measurements independent of the network used.
  • a photodiode when exposed to a light source transforms this light in intensity, Ip, which depends on the incident luminous power, P.
  • Ip the light in intensity
  • P the incident luminous power
  • the working range of the photodiodes is limited superiorly by the saturation (maximum current that the photodiode supplies) and inferiorly by the noise of the photodiode itself (noise floor).
  • the photodiode further contains parasitic elements such as the junction capacitance, Cj, and the shunt resistor which are in parallel with the current source, and the resistance of the terminals, Rs.
  • the noise produced by the photodiode is an important characteristic in the measurement of the low power signals, and which in most cases is equivalent to a noise power (NEP) de 4 fW/VHz.
  • NEP noise power
  • the noise level generated by the photodiode is typically much lower than the thermal noise generated by the resistive elements of the circuit, that is, the circuit conversion load/signal measurement.
  • the noise level for a lHz band and at a temperature of 25°C produced by the shunt resistor, Rs, of 2GQ and the junction capacity, Cj, of lOpF of the photodiode with a load of 50 W is equal to 7,5 pW which is equivalent to -81,2 dBm.
  • the minimum power in the fiber on the operator's side is approximately 2dB (considering 1 dB of loss distributed by the connectors and fusions along the trajectory to the client and 1 dB more margin) above the sensitivity of the optical receptor, that is, -30 dBm for class C+ and -26 dBm for class B+.
  • the output signal produced by a photodiode can be measured by tension or current, the latter one being the most used, since it presents a behavior that is more linear, little offset and a high bandwidth.
  • the system developed further allows the adaptation and assembly in common equipment that is already existent in the optical fiber networks currently in use; the signalization is local and can be visible; it does not depend on the type of connector used; and can be energetically independent of a physical local power source.
  • FIG. 1 illustrates schematically the block diagram of the monitoring system reading module (100), wherein:
  • Figure 2 illustrates a working mode of the reading module (100) of the monitoring system relative to an independent channel, in this case channel 1 (101), the concept however, being applied transversally to the n next channels (101+n), wherein:
  • FIG. 1 illustrates in detail the working of the reading module (100) by action of the ascending channel photodiode (1011), caused by the ascending data flow toward the active equipment of the center.
  • the references identify:
  • Figure 4 similarly to the previous figure, illustrates in detail the working of the reading module (100) by means of the action of the descending channel photodiode (1021), caused by the descending flow of data toward the active equipment of the final user.
  • the references identify:
  • Figure 5 illustrates a possible implementation form of the reading module (100), with application developed for 12 reading channels, wherein:
  • Figure 6 illustrates the same form of implementation of Figure 5, with the inclusion of the upper surface (300) applied to the system (100).
  • Figure 7 illustrates a possible implementation form of the monitoring system (100) applied to an ODF.
  • the monitoring system developed is formed by two components, a reading module (100) and a user equipment, responsible for the transmission of energy, communication, data communication and respective presentation of the information to the user.
  • a reading module 100
  • a user equipment responsible for the transmission of energy, communication, data communication and respective presentation of the information to the user.
  • the optical systems usually monitored focus mainly over Synchronous Digital Hierarchy (SDH) connection, wherein the transmission frequencies are found within some dozens of GHs, which in the case of the optical measurement of the photodiodes (1011, 1021) by current would make mandatory more exacting specifications for the electronic components. For this reason, in the development, it was opted to carry out the measurement by tension placing the photodiodes (1011, 1021) in the photovoltaic mode. This decision enabled taking advantage of the parasitic capacities of the photodiodes (1011, 1021) to integrate over the time the captured signal, thus relieving the technical specifications of the amplifier which interconnects to the photodiode (1011, 1021).
  • SDH Synchronous Digital Hierarchy
  • the amplifier (1012, 1022) which interconnects with the photodiode (1011, 1021), so as not to influence the readings, presents an impedance entry superior to the shunt resistance of the photodiode and leakage currents at least ten times lower than the current produced by the photodiode when irradiated with the minimum optical power which it is intended to measure.
  • the operational amplifier (1012, 1022) chosen presents in the entries a leakage current lower than 20fA, an exit offset lower than 150pV and a typical current consumption of IOmA.
  • the tension gain of the amplifier was defined to detect optical signal levels lower than -20 dBm with an insertion attenuation close to 1 dB (attenuation introduced by the macrocurvature) for which it is necessary a gain superior to 40.
  • the reading equipment (100) developed allows detecting the presence of optical signals with powers up to -30dBm, with minimum insertion losses lower than ldB.
  • the processing of the signal is made by microcontroller (1040) with connectivity carried out by means of the bidirectional communication NFC (1060), which presents the possibility and capacity for self-supplying (1050) originating from the electromagnetic field generated by the NFC connection (1060), which will further provide supply to the remaining components of the reading module circuit (100).
  • the fiber reading module (100) works in an independent manner, there not existing the need for a permanent energetic supply source, or resource to a battery.
  • the external receptor antenna of the NFC implemented in the reading module (100) presents a minimum area of 47mm x 32mm.
  • the circuit With the approximation of a user device with NFC reader to the antenna of the fiber reading module (100), the circuit will be automatically fed, providing the sequential reading of the state of the channels (101, 101+n), which will subsequently be sent by NFC (1060).
  • each channel (101, 101+n) is codified according to the following values:
  • the mechanical solution developed for the creation of the macrocurvatures in the fibers is constituted by mechanical elements, a lower surface (400), drafted to support a printed circuit board (PCB) with all the electronics necessary for carrying out the readings and respective transmission to the user equipment, which incorporates a rear retention array (401) and a front retention array (402), and, an upper surface (300) which incorporates a compression boss (300) responsible for deforming the fiber at the reading location.
  • Several solutions were developed which contemplate different curvature radius in the region of interest, which comprise values between 6mm and 15mm, whereby, the curvature radius of 9mm among the arrays (401, 402) introduces an insertion loss value approximately of 1 dB. This slight attenuation does not significantly interfere with the signals transmitted, since it is found within the parameters used by the telecommunications operators which allows them to guarantee the delivery of the service to the client without affecting the global performance of the connection.
  • the integration time, or measure, of the reading module (100), depends inversely on the optical power, that is, the lower the power in the fiber the longer will be the time necessary to obtain a reliable measure.
  • the measurement time, however, for the application developed never exceeds one second duration even for optical powers of -30 dBm.
  • the reading module (100) described allows simultaneous monitoring of the activity in multiple fibers and in both directions of traffic: ascendent (upload) and descendent (download).
  • the equipment indirectly measures, by means of the macrocurvature technique, the optical power which flows in the fiber being independent of the protocol used in the network and optical signal wavelengths.
  • the same is detected in real time when of the interaction of the user equipment with the module (100).
  • the reading module (100) is constituted by, in one of the proposed embodiments, multiple monitoring channels (101+n) regardless of whether they interconnect to a processing unit (1040), or microcontroller, directly or by means of one or several switching circuits, as exemplified in Figure 1.
  • Each monitoring channel (101) is characterized by the existence of a mechanical part or compression boss (301), two photodiodes (1011, 1021), two amplifiers (1012, 1022) and two Schmitt-trigger logic gates (1013, 1023).
  • the compression boss (301) existent on the upper surface (300), allows introducing a slight curvature in the optical fiber of each channel (macrocurvature), sufficient to produce a light extraction in the referred fiber, introducing a slight attenuation, or loss of residual insertion, in the optical connection with values lower than 1 dB.
  • FIG 2 there is presented in vertical view the physical aspect of the macrocurvature system created by the crushing of the fiber (200) when compressed by the compression boss (300).
  • the macrocurvature in the fiber (200) is possible due to the positioning of the latter in the rear retention array (401) and front (402), which is compressed between both the arrays (401, 402), by the boss (300).
  • the upper surface (300) equipped with the compression boss (301) can be coupled to the reading module (100) without the need to turn off the optical connection between the emitter and receptor equipment. This functionality is possible due to the low insertion loss, which allows guaranteeing that the equipment execute non- intrusive measurements in the optical fiber network.
  • the photodiodes (1011, 1021) are strategically positioned close to the arrays (401, 402) and on the extremes of the bend caused by the compression boss (301) to maximize the capture of the light originating from the fiber, in both communication directions, such as presented in Figures 3 and 4.
  • the curvature radius of the fiber (200) comprises values between 6mm and 15mm, whereby, a curvature radius of 9mm introduces a loss insertion value of approximately 1 dB.
  • the compression boss (301) presents a width of 3mm and a height of 2mm relative to the face of the upper surface (300), introducing a compression of sensitively 1mm height in the fiber (200).
  • the distancing proposed between the rear retention array (401) and the front retention array (402), in one of the proposed embodiments, is sensitively 12mm.
  • the photodiodes (1011, 1021) are responsible for carrying out the conversion of the photons into electrons, physical process known as photoelectric effect.
  • the quantity of electrons produced by the photodiode depends directly on the quantity of photons received, which can be electrically modelled by a source of current dependent on luminous intensity.
  • the electric signal generated by the photodiode is compared with a decision level of a Schmitt- trigger logic gate being thus converted into digital.
  • Each monitoring channel makes available two digital signals which reflect the activity state and direction of the optical signal which flows in the optical channel.
  • each photodiode is exposed to the optical signal which flows in each direction such as illustrated in Figures 3 and 4.

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention décrit un système de surveillance en temps réel destiné aux réseaux de fibres optiques passifs destinés à utiliser dans des technologies DWDM, GPON, XGPON, ou autres, de manière permanente et non intrusive. Le système développé permet, de manière non restrictive, la surveillance bidirectionnelle en temps réel d'au moins 12 canaux optiques simultanément. Le système développé comprend l'utilisation de deux composants, d'un module de lecture, et d'un dispositif utilisateur qui est techniquement adapté pour procéder à la lecture des informations provenant du module de lecture, qui mettra à disposition de l'utilisateur l'état de fonctionnement de chaque fibre optique analysée. La communication entre les dispositifs peut comprendre l'utilisation d'une technologie NFC ou d'une autre qui est techniquement équivalente. Sans être considéré comme une restriction de la fonctionnalité du système, cela peut envisager l'utilisation de sources d'énergie physiques locales ou distantes, celles-ci ayant recours à une transmission de puissance par la proximité du dispositif utilisateur.
EP21748670.3A 2020-07-24 2021-07-21 Surveillance de trafic non intrusive dans des réseaux de fibres optiques Pending EP4186179A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PT11659920 2020-07-24
PCT/IB2021/056608 WO2022018670A1 (fr) 2020-07-24 2021-07-21 Surveillance de trafic non intrusive dans des réseaux de fibres optiques

Publications (1)

Publication Number Publication Date
EP4186179A1 true EP4186179A1 (fr) 2023-05-31

Family

ID=77126869

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21748670.3A Pending EP4186179A1 (fr) 2020-07-24 2021-07-21 Surveillance de trafic non intrusive dans des réseaux de fibres optiques

Country Status (2)

Country Link
EP (1) EP4186179A1 (fr)
WO (1) WO2022018670A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2082231A1 (fr) * 1991-11-19 1993-05-20 Richard Buerli Trousse de controle des pertes locales
US5315365A (en) * 1992-06-17 1994-05-24 Laser Precision Corp. Macrobend splice loss tester for fiber optic splices with silicon gel cushion on optical coupling blocks
US5708499A (en) 1996-07-24 1998-01-13 Lucent Technologies Inc. Optical components for live-fiber identifier and coupler
CN101411098A (zh) * 2006-11-17 2009-04-15 Afl电信公司 用于光纤的信号识别设备
JP5399050B2 (ja) * 2008-11-17 2014-01-29 株式会社フジクラ 光ファイバ曲げ受光器
US8729459B2 (en) * 2010-03-25 2014-05-20 Conolog Corporation Apparatus and method for detecting optical energy in an optical fiber
WO2017205723A1 (fr) * 2016-05-26 2017-11-30 Safe-Com Wireless Système de capteurs distribué

Also Published As

Publication number Publication date
WO2022018670A1 (fr) 2022-01-27

Similar Documents

Publication Publication Date Title
EP2846480B1 (fr) Procédé et dispositif pour mesurer une perte de liaison d'une ligne de transmission optique
CN105721048B (zh) 一种复合型光纤通信线路故障监测方法及系统
US8280253B2 (en) Optical telecommunications network terminal, an installation including the terminal, and a method of detecting a break in optical transmission means
CN102714545B (zh) 光收发模块、无源光网络系统、光纤检测方法和系统
US11668590B2 (en) System and method for fiber sensing
US7310134B2 (en) Device and method of optical fiber condition monitoring in optical networks
CN101170360B (zh) 一种信号光功率检测设备及检测方法
EP3119015B1 (fr) Appareil et système de mise en oeuvre de réflectométrie optique temporelle (otdr)
WO2014025532A2 (fr) Micro otdr dans un émetteur-récepteur de données
CN102130720A (zh) 无源光网络的光功率检测方法、系统和装置
CN109560875B (zh) 一种具有温度检测及补偿功能的光纤光栅编码装置和方法
WO2011140953A1 (fr) Procédé, système et dispositif de détection pour un réseau de fibres d'un point unique à des points multiples
CN104205676B (zh) 光线路终端、光收发模块、系统以及光纤检测方法
CN101411098A (zh) 用于光纤的信号识别设备
CN102834705A (zh) 使用光学反射计监视系统
CN102928740B (zh) 智能集合型故障诊断与在线测温系统
CN104361707A (zh) 光纤感温火灾探测器系统
CN103647606A (zh) 一种带rssi功能的gpon终端收发一体光组件
US11057144B2 (en) Optical transmission apparatus, method for setting wavelength, and optical transceiver
WO2022018670A1 (fr) Surveillance de trafic non intrusive dans des réseaux de fibres optiques
US20230147193A1 (en) Diagnostic device and diagnostic method
Usman et al. An enhanced G-PON fault monitoring technique using optical sensor
KR101471066B1 (ko) 반사를 이용한 파장 및 세기 분석장치
Serrador et al. Powerless Sensor for Non-Intrusive Multi-Fiber Traffic Monitoring
CN202818298U (zh) 嵌入式光时域反射仪及光网络系统

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20230224

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)