WO2022079843A1 - モニタ装置及び光ファイバ特定方法 - Google Patents
モニタ装置及び光ファイバ特定方法 Download PDFInfo
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- WO2022079843A1 WO2022079843A1 PCT/JP2020/038826 JP2020038826W WO2022079843A1 WO 2022079843 A1 WO2022079843 A1 WO 2022079843A1 JP 2020038826 W JP2020038826 W JP 2020038826W WO 2022079843 A1 WO2022079843 A1 WO 2022079843A1
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- optical fiber
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 105
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012806 monitoring device Methods 0.000 title claims abstract description 24
- 230000003287 optical effect Effects 0.000 claims abstract description 111
- 238000005452 bending Methods 0.000 claims description 10
- 238000010276 construction Methods 0.000 abstract description 7
- 238000004891 communication Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 11
- 238000012360 testing method Methods 0.000 description 8
- 238000012544 monitoring process Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000001902 propagating effect Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000011144 upstream manufacturing Methods 0.000 description 1
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- 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
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
-
- 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
-
- 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
- H04B10/25—Arrangements specific to fibre transmission
-
- 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
- H04B10/27—Arrangements for networking
- H04B10/272—Star-type networks or tree-type networks
Definitions
- the present disclosure relates to a monitoring device for specifying the position of an optical fiber included in an optical network and a method for specifying an optical fiber.
- FIG. 1 is a diagram illustrating the configuration of an optical network.
- the optical network provides users with Internet and telephone services by laying the equipment shown in FIG.
- the installed equipment is an optical network unit (Optical Line Thermal: OLT) 11 which is a communication device installed in a communication building, and an optical subscriber line network unit (Optical Network Unit: ONU) installed in a user's house 20. ) 21.
- OLT 11 and the ONU 21 are connected by using an integrated optical wiring rack IDM (Integrated Distribution Module) 12, an optical cable 50, and an 8-branch splitter 51 (the number of branches is arbitrary. In this example, 8 branches will be described). ..
- IDM Integrated Distribution Module
- the OLT 11 outputs a wavelength of 1490 nm or 1550 nm, and the ONU 21 outputs a wavelength of 1310 nm.
- OLT11 and ONU21 recognize each other and provide users with high-speed broadband services such as the Internet and telephones.
- FIG. 2 is a diagram illustrating a place where the first work is performed.
- a closure 52 is provided beside the utility pole 55.
- An optical fiber 60 comes out from the closure 52 and extends to the user's house 20. The worker goes up to the utility pole 55, opens the box of the closure 52, and works.
- FIG. 3 shows the wiring inside the closure 52.
- a large number of 8-branch splitters 51 are installed in one closure 52.
- the number of optical fibers connected to one 8-branch splitter 51 is nine.
- the breakdown is eight optical fibers from the 8-branch splitter 51 to the user's house 20, and one optical fiber in the optical cable 50 connecting the 8-branch splitter 51 to the communication building 10. If one 8-branch splitter 51 is arranged in the closure 52, nine optical fibers are wired, and if two 8-branch splitters are arranged, 18 optical fibers are wired.
- FIG. 4 is a diagram illustrating the inside of the closure 52.
- the closure 52 has a multi-stage tray 53 that houses the 8-branch splitter 51. Further, the optical fiber connected to the 8-branch splitter 51 is housed in the space of the frame 54.
- the number of 8-branch splitters 51 accommodated is small, the number of optical fibers accommodated in the frame 54 is also small, and the optical fibers can be easily specified.
- the 8-branch splitter 51 is accommodated in all of the trays 53, the number of optical fibers increases, the optical fibers are densely packed in the space of the frame 54, and it becomes difficult to specify the optical fibers. That is, there is a possibility that the worker selects and works on the wrong optical fiber, and the wrong construction occurs.
- test wavelength a wavelength of 1650 nm, which is different from the wavelength for communication.
- test wavelength a wavelength of 1650 nm
- the test light TL is emitted from the communication building 10. It is known that bending an optical fiber leaks light propagating through the core of the optical fiber. Therefore, if the bending portion R1 is given to the optical fiber between the communication building 10 and the 8-branch splitter 51, the test optical TL leaks out, so that the optical fiber can be specified.
- Non-Patent Document 1 cannot specify the optical fiber between the 8-branch splitter and the ONU.
- Non-Patent Document 2 An optical signal is output from the ONU 21, and the optical signal includes a MAC address.
- the MAC address is a number assigned to ONU21, and the numbers do not overlap. Therefore, by specifying this number, the optical fiber between the 8-branch splitter 51 and the ONU 21 can be specified.
- bend R is given to the optical fiber, and the optical signal from ONU21 is leaked.
- the ONU optical signal includes transmission data as shown in FIG. Of these, the source address is the MAC address.
- a monitor tool 70 is used to display this MAC address.
- the monitor tool 70 has a function of receiving the leaked optical signal SL, analyzing the optical signal SL, and displaying the MAC address. Since the MAC address is different for each ONU21, the optical fiber can be specified.
- Keitaka Enomoto "Optical Core Wire Contrast", Institute of Electronics, Information and Communication Engineers, Knowledge Forest, 5-2-6, P6 Einobu Hirota, Tomohiro Kawano, Makoto Maho, Kazutaka Nado, Natsuki Honda, Takanori Kiyokura, Tetsuya Manabe, "Monitoring ONU Uplight Using Lateral Optical Output Technology", Institute of Electronics, Information and Communication Engineers Japanese Journal B, Vol. J100-B, No. 4, pp. 315-325, 2017.
- the first work includes the work of removing the optical fiber in the closure.
- optical fibers are densely packed in the closure, and it is conceivable that the operator mistakenly cuts the optical fiber. For example, if an operator mistakenly cuts the optical fiber between the OLT 11 and the 8-branch splitter 51, the service to up to eight ONU 21s will be stopped.
- Non-Patent Documents 1 and 2 In order to avoid the mistake, it is necessary to specify the optical fiber to be cut by the method disclosed in Non-Patent Documents 1 and 2. However, it is inefficient for the worker to work at the construction site by the two methods disclosed in Non-Patent Documents 1 and 2. That is, the method disclosed in the non-patent document has a problem that it is difficult to work efficiently.
- an object of the present invention is to provide a monitoring device and an optical fiber identification method capable of efficiently specifying an optical fiber at a construction site in order to solve the above-mentioned problems.
- the monitoring device has decided to display the number of unique numbers of ONU included in the optical signal leaked from the bent portion.
- the monitoring device includes a light receiver that receives an optical signal leaked from an optical fiber, a counter that counts the number of unique numbers indicating a transmission source included in the optical signal, and the above. It is provided with a display unit for displaying the number of unique numbers.
- the optical fiber identification method receives an optical signal leaked from the optical fiber, counts the number of unique numbers indicating a transmission source included in the optical signal, and counts the number of unique numbers. Is displayed on the display unit.
- the uplink optical signal between the ONU 21 and the 8-branch splitter 51 is only the one transmitted by the ONU 21, and the unique number (MAC address) of the ONU included in the optical signal. Etc.) is only one.
- the uplink signal between the OLT 11 and the 8-branch splitter 51 includes an uplink signal transmitted by a maximum of eight ONUs 21, and the ONU unique number (MAC address, etc.) included in the optical signal is one or more. There are multiple.
- the present invention can provide a monitoring device and an optical fiber identification method capable of efficiently identifying an optical fiber at a construction site.
- the receiver of the monitoring device is characterized by receiving the optical signal transmitted by the ONU.
- the display unit is displayed to indicate that the location where the optical signal is leaked is between the optical splitter and the OLT. If the number of the unique numbers is 1, it is unclear whether the location where the optical signal is leaked is between the optical splitter and the OLT, or between the optical splitter and the ONU.
- a control unit for displaying the effect on the display unit may be further provided.
- the monitoring device may further include a bending imparting portion for forming the bending portion for leaking the optical signal from the optical fiber into the optical fiber.
- the present invention can provide a monitoring device and an optical fiber identification method capable of efficiently identifying an optical fiber at a construction site.
- FIG. 7 is a diagram illustrating an optical fiber specifying method.
- the optical network network in which the OLT 11 and the ONU 21 are connected by the 8-branch splitter 51 will be described. Further, in the present embodiment, eight ONUs 21 are connected to the 8-branch splitter 51.
- FIG. 14 is a diagram illustrating a monitor device 71.
- the monitoring device 71 has a light receiver 74 that receives the optical signal SL leaked from the optical fiber, a counter 75 that counts the number of unique numbers indicating the transmission source included in the optical signal SL, and the number of the unique numbers.
- a display unit 76 for displaying is provided.
- the monitoring device 71 further includes a bending imparting portion 73 that forms a bending portion that leaks the optical signal SL from the optical fiber into the optical fiber.
- the bending portion imparting portion 73 bends the optical fiber between the OLT 11 and the 8-branch splitter 51, and takes out the optical signal SL output by the ONU 21 as leaked light. The leaked light is collected by the probe 72 and propagated to the monitor tool 70.
- the monitoring device 71 indicates that the location where the optical signal SL is leaked is between the optical splitter (8-branch splitter 51) and the OLT 11.
- Display on 76 If the number of the unique numbers is 1, the location where the optical signal SL is leaked is between the optical splitter (8-branch splitter 51) and the OLT11, or the optical splitter (8-branch splitter 51) and the ONU21. Further, a control unit 77 for displaying on the display unit 76 that it is unknown whether or not it is between the two is provided.
- the monitor tool 70 can analyze the MAC address of the ONU 21 included in the optical signal SL with the measuring instrument 75 and display the result on the display unit 76.
- the monitor tool 70 is provided with a control unit 77, and the control unit 77 determines the number of MAC addresses included in the optical signal SL, not the numerical value specifically assigned to the display unit 76. indicate. That is, the monitor tool 70 displays the number of ONUs 21 connected to the 8-branch splitter 51.
- FIG. 8 is a diagram illustrating a display example displayed by the display unit 76.
- the display unit 76 displays as shown in FIG.
- the control unit 77 is notified by the measuring instrument 75 that the received optical signal SL contains eight MAC addresses, and the optical fiber bent by the worker is a section between the 8-branch splitter 51 and the OLT 11. to decide. That is, when the optical fiber currently being inspected (which is leaking the optical signal SL) is cut, the control unit 77 "cuts" because the service to all ONUs 21 connected to the 8-branch splitter 51 is stopped. Do not do it "is displayed on the display unit 76.
- FIG. 9 is a diagram illustrating a method for specifying an optical fiber.
- the optical network network in which the OLT 11 and the ONU 21 are connected by the 8-branch splitter 51 will be described. Further, in the present embodiment, two ONUs 21 are connected to the 8-branch splitter 51.
- FIG. 10 is a diagram illustrating a display example displayed by the display unit 76.
- the display unit 76 displays as shown in FIG.
- the control unit 77 is notified by the measuring instrument 75 that the received optical signal SL contains two MAC addresses, and the optical fiber bent by the worker is a section between the 8-branch splitter 51 and the OLT 11. to decide. That is, when the optical fiber currently being inspected (which is leaking the optical signal SL) is cut, the control unit 77 "cuts" because the service to all ONUs 21 connected to the 8-branch splitter 51 is stopped. Do not do it "is displayed on the display unit 76.
- FIG. 11 is a diagram illustrating an optical fiber specifying method.
- the optical network network in which the OLT 11 and the ONU 21 are connected by the 8-branch splitter 51 will be described. Further, in the present embodiment, one ONU 21 is connected to the 8-branch splitter 51.
- FIG. 12 is a diagram illustrating a display example displayed by the display unit 76.
- one ONU 21 is connected to the branch splitter 51, and the optical signal SL received by the light receiver 74 includes one MAC address. Therefore, the optical fiber bent by the worker is either between the OLT 11 and the 8-branch splitter 51 or between the ONU 21 and the 8-branch splitter 51. Therefore, the control unit 77 causes the display unit 76 to display the optical fiber so that the operator can visually check the optical fiber. By causing the monitoring device 71 to issue a visual confirmation instruction, a disconnection accident is prevented.
- FIG. 13 is a flowchart illustrating a method for specifying an optical fiber performed by the monitoring device 71.
- This optical fiber identification method is Forming a bent portion in the optical fiber when the optical signal SL is leaked from the optical fiber (step S11).
- Receiving the optical signal SL leaked from the optical fiber step S12).
- the optical signal output from the ONU 21 passes through the optical fiber and reaches the OLT 11 of the communication building.
- the optical fiber is bent by the monitoring device 71 on the way, a part of the optical signal propagating in the optical fiber leaks to the outside of the optical fiber.
- the monitor device 71 includes a light receiving unit 74, and the optical signal SL is received by the receiving unit 74.
- the light receiving unit 74 include an avalanche photodiode (APD).
- APD avalanche photodiode
- the optical signal SL is converted into an electric signal.
- the electrical signal is encrypted and the MAC address cannot be displayed at this point. Therefore, the light receiving unit 74 demodulates the electric signal including the MAC address. By demodulating the electric signal, the MAC address assigned to the ONU 21 can be confirmed.
- the control unit 77 causes the display unit 76 to display the MAC address. Further, since the measuring instrument 75 measures the number of MAC addresses included in the optical signal SL, the control unit 77 causes the display unit 76 to display the number as well. This is because the number of MAC addresses is more important than the MAC address number as the information to be notified to the worker.
- the worker can identify the optical fiber by proceeding with the work according to the flow of FIG. 14 according to the number of MAC addresses displayed on the display unit 76, and can avoid erroneous work.
- the flow of FIG. 14 may be determined by the control unit 77 and displayed on the display unit 76, not by the operator.
- FIG. 14 is a diagram illustrating a method of analyzing the upstream optical signal SL from the ONU 21 and specifying the position of the optical fiber from the number of MAC addresses.
- the display unit 76 is displayed to indicate that the location where the optical signal SL is leaked is between the 8-branch splitter 51 and the OLT 11. If the number of numbers is 1, it is displayed that it is unclear whether the location where the optical signal SL is leaked is between the 8-branch splitter 51 and the OLT11 or between the 8-branch splitter 51 and the ONU21. Displayed in unit 76.
- the flow of FIG. 14 is a flow made after step S14 of FIG.
- the operator or the control unit 77 confirms the number of MAC addresses of the ONU 21 (step S21). If the number is two or more, the operator or the control unit 77 determines that the position where the optical fiber is bent is between the 8-branch splitter 51 and the OLT 11 (step S22). On the other hand, when the number of MAC dresses is only one, the operator or the control unit 77 determines whether the position where the optical fiber is bent is between the 8-branch splitter 51 and the OLT 11 (step S22), or the 8-branch splitter 51. It cannot be determined whether it is between the ONU 21 and the ONU 21 (step S24).
- the operator specifies the position by visually checking the optical fiber.
- the control unit 77 causes the display unit 76 to display the content described with reference to FIG. 12, and urges the operator to visually check the optical fiber (step S23). The operator can visually confirm whether it is step S22 or step S24.
- the optical fiber identification method using the monitor device 71 can easily and surely identify the position of the optical fiber to be constructed by following the judgment criteria as shown in FIG.
- the monitoring device 71 described in the above embodiment can also be realized by a computer and a program, and the program can be recorded on a recording medium or provided through a network.
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Abstract
Description
図3は、クロージャ52の中の配線を示している。1つのクロージャ52の中には、多数の8分岐スプリッタ51が設置される。1つの8分岐スプリッタ51に接続される光ファイバの本数は9本である。その内訳は、8分岐スプリッタ51からユーザ宅20までの8本の光ファイバ、そして、8分岐スプリッタ51から通信ビル10までをつなぐ光ケーブル50内の光ファイバが1本である。クロージャ52の中に、8分岐スプリッタ51が1つ配置されれば9本の光ファイバが配線され、8分岐スプリッタが2つ配置されれば18本の光ファイバが配線される。
前記固有番号の数が2以上であれば、前記光信号を漏洩させた箇所が前記光スプリッタと前記OLTとの間である旨を前記表示部に表示させ、
、前記固有番号の数が1であれば、前記光信号を漏洩させた箇所が前記光スプリッタと前記OLTとの間であるか、前記光スプリッタと前記ONUとの間であるかが不明である旨を前記表示部に表示させる制御部をさらに備えていてもよい。
図7は、光ファイバ特定方法を説明する図である。本実施形態では、OLT11とONU21とが8分岐スプリッタ51で接続されている光ネットワーク網で説明する。また、本実施形態では、8分岐スプリッタ51に8台のONU21が接続されている。
、前記固有番号の数が1であれば、光信号SLを漏洩させた箇所が前記光スプリッタ(8分岐スプリッタ51)とOLT11との間であるか、前記光スプリッタ(8分岐スプリッタ51)とONU21との間であるかが不明である旨を表示部76に表示させる制御部77を
さらに備える。
図9は、光ファイバ特定方法を説明する図である。本実施形態では、OLT11とONU21とが8分岐スプリッタ51で接続されている光ネットワーク網で説明する。また、本実施形態では、8分岐スプリッタ51に2台のONU21が接続されている。
図11は、光ファイバ特定方法を説明する図である。本実施形態では、OLT11とONU21とが8分岐スプリッタ51で接続されている光ネットワーク網で説明する。また、本実施形態では、8分岐スプリッタ51に1台のONU21が接続されている。
図13は、モニタ装置71が行う光ファイバ特定方法を説明するフローチャートである。本光ファイバ特定方法は、
光ファイバから光信号SLを漏洩させるときに曲げ部を前記光ファイバに形成すること(ステップS11)、
前記光ファイバから漏洩させた光信号SLを受光すること(ステップS12)、
光信号SLに含まれる送信元を示す固有番号(MACアドレス)の数を計数すること(ステップS13)、及び
前記固有番号の数を表示部76に表示すること(ステップS14)
を特徴とする。
当該方法は、固有番号(MACアドレス)の数が2以上であれば、光信号SLを漏洩させた箇所が8分岐スプリッタ51とOLT11との間である旨を表示部76に表示させ、前記固有番号の数が1であれば、光信号SLを漏洩させた箇所が8分岐スプリッタ51とOLT11との間であるか、8分岐スプリッタ51とONU21との間であるかが不明である旨を表示部76に表示させる。
一方、MACドレスの数が1つのみである場合、作業者又は制御部77は、光ファイバを曲げている位置が8分岐スプリッタ51とOLT11の間であるのか(ステップS22)、8分岐スプリッタ51とONU21の間であるのか(ステップS24)を判定できない。そこで、作業者は当該光ファイバを目視確認をすることで位置を特定する。あるいは、制御部77は、表示部76に図12で説明した内容を表示させ、作業者に当該光ファイバを目視確認するように促す(ステップS23)。作業者が目視確認を行うことでステップS22であるか、ステップS24であるかを特定することができる。
上記実施形態で説明したモニタ装置71は、コンピュータとプログラムによっても実現でき、プログラムを記録媒体に記録することも、ネットワークを通して提供することも可能である。
11:OLT
12:IDM
20:ユーザ宅
21:ONU
50:光ケーブル
51:光スプリッタ(8分岐スプリッタ)
52:クロージャ
53:トレイ
54:枠
55:電柱
60:光ファイバ
70:モニタツール
71:モニタ装置
72:プローブ
73:曲げ付与部
74:受光器
75:計測器
76:表示部
77:制御部
Claims (6)
- 光ファイバから漏洩させた光信号を受光する受光器と、
前記光信号に含まれる送信元を示す固有番号の数を計数する計数器と、
前記固有番号の数を表示する表示部と、
を備えるモニタ装置。 - 前記光ファイバが、1つの光加入者線終端装置(OLT;Optical Line Terminal)と複数の光加入者線ネットワーク装置(ONU;Optical Network Unit)とが光スプリッタを介して接続される光ネットワーク網(PON;Passive Optical Network)に含まれる光ファイバであって、
前記受光器は、前記ONUが送信した前記光信号を受光することを特徴とし、
前記固有番号の数が2以上であれば、前記光信号を漏洩させた箇所が前記光スプリッタと前記OLTとの間である旨を前記表示部に表示させ、
前記固有番号の数が1であれば、前記光信号を漏洩させた箇所が前記光スプリッタと前記OLTとの間であるか、前記光スプリッタと前記ONUとの間であるかが不明である旨を前記表示部に表示させる制御部を
さらに備えることを特徴とする請求項1に記載のモニタ装置。 - 前記光ファイバから前記光信号を漏洩させる曲げ部を前記光ファイバに形成する曲げ付与部をさらに備えることを特徴とする請求項1又は2に記載のモニタ装置。
- 光ファイバから漏洩させた光信号を受光すること、
前記光信号に含まれる送信元を示す固有番号の数を計数すること、及び
前記固有番号の数を表示部に表示すること
を特徴とする光ファイバ特定方法。 - 前記光ファイバが、1つの光加入者線終端装置(OLT;Optical Line Terminal)と複数の光加入者線ネットワーク装置(ONU;Optical Network Unit)とが光スプリッタを介して接続される光ネットワーク網(PON;Passive Optical Network)に含まれる光ファイバであって、
前記光信号は前記ONUから送信されたものであり、
前記固有番号の数が2以上であれば、前記光信号を漏洩させた箇所が前記光スプリッタと前記OLTとの間である旨を前記表示部に表示させ、
前記固有番号の数が1であれば、前記光信号を漏洩させた箇所が前記光スプリッタと前記OLTとの間であるか、前記光スプリッタと前記ONUとの間であるかが不明である旨を前記表示部に表示させること
をさらに行うことを特徴とする請求項4に記載の光ファイバ特定方法。 - 前記光ファイバから前記光信号を漏洩させるときに曲げ部を前記光ファイバに形成することを特徴とする請求項4又は5に記載の光ファイバ特定方法。
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0495433A (ja) * | 1990-08-10 | 1992-03-27 | Nippon Denshin Kogyo Kk | 周波数偏移キーイング装置 |
JP2009177510A (ja) * | 2008-01-24 | 2009-08-06 | Nippon Telegr & Teleph Corp <Ntt> | 通信監視装置および監視端末装置 |
JP2014121009A (ja) * | 2012-12-18 | 2014-06-30 | Nippon Telegr & Teleph Corp <Ntt> | 通信監視装置、通信監視方法及び光線路試験システム |
US20150288446A1 (en) * | 2011-11-08 | 2015-10-08 | Huawei Technologies Co., Ltd. | Fiber recognition method, optical line terminal, and recognition system |
JP2015220694A (ja) * | 2014-05-20 | 2015-12-07 | 日本電信電話株式会社 | スプリッタ下部光ファイバ心線の特定装置及び方法 |
WO2020203333A1 (ja) * | 2019-04-03 | 2020-10-08 | 日本電信電話株式会社 | 光ファイバ表示システム及び光ファイバ切替方法 |
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2020
- 2020-10-14 JP JP2022556763A patent/JP7424506B2/ja active Active
- 2020-10-14 WO PCT/JP2020/038826 patent/WO2022079843A1/ja active Application Filing
- 2020-10-14 US US18/028,907 patent/US20240031019A1/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0495433A (ja) * | 1990-08-10 | 1992-03-27 | Nippon Denshin Kogyo Kk | 周波数偏移キーイング装置 |
JP2009177510A (ja) * | 2008-01-24 | 2009-08-06 | Nippon Telegr & Teleph Corp <Ntt> | 通信監視装置および監視端末装置 |
US20150288446A1 (en) * | 2011-11-08 | 2015-10-08 | Huawei Technologies Co., Ltd. | Fiber recognition method, optical line terminal, and recognition system |
JP2014121009A (ja) * | 2012-12-18 | 2014-06-30 | Nippon Telegr & Teleph Corp <Ntt> | 通信監視装置、通信監視方法及び光線路試験システム |
JP2015220694A (ja) * | 2014-05-20 | 2015-12-07 | 日本電信電話株式会社 | スプリッタ下部光ファイバ心線の特定装置及び方法 |
WO2020203333A1 (ja) * | 2019-04-03 | 2020-10-08 | 日本電信電話株式会社 | 光ファイバ表示システム及び光ファイバ切替方法 |
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US20240031019A1 (en) | 2024-01-25 |
JP7424506B2 (ja) | 2024-01-30 |
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