WO2010101001A1 - Appareil de surveillance de transmission optique - Google Patents

Appareil de surveillance de transmission optique Download PDF

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Publication number
WO2010101001A1
WO2010101001A1 PCT/JP2010/051797 JP2010051797W WO2010101001A1 WO 2010101001 A1 WO2010101001 A1 WO 2010101001A1 JP 2010051797 W JP2010051797 W JP 2010051797W WO 2010101001 A1 WO2010101001 A1 WO 2010101001A1
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WIPO (PCT)
Prior art keywords
optical
transmission
station
unit
transmission line
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Application number
PCT/JP2010/051797
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English (en)
Japanese (ja)
Inventor
善文 菱川
義行 末次
一雅 小澤
斎藤　和人
欣邦 前山
泰 木田
広幸 宗像
吉田　真一
Original Assignee
住友電気工業株式会社
住友電工ネットワークス株式会社
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Application filed by 住友電気工業株式会社, 住友電工ネットワークス株式会社 filed Critical 住友電気工業株式会社
Priority to CN201080010429.9A priority Critical patent/CN102342045B/zh
Priority to JP2011502700A priority patent/JP5200159B2/ja
Publication of WO2010101001A1 publication Critical patent/WO2010101001A1/fr

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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
    • H04B10/0771—Fault location on the transmission path
    • 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]

Definitions

  • pulse test light is propagated through an optical fiber transmission line laid between the first station and the second station, and the first is based on backscattered light generated when the pulse test light is propagated.
  • the present invention relates to an apparatus for monitoring optical transmission performed between a station and a second station.
  • An optical fiber transmission system transmits and receives signal light via an optical fiber transmission line laid between a first station (for example, a base station) and a second station (for example, a subscriber's house).
  • a system in which a first station and a plurality of second stations are connected via an optical fiber transmission line via a splitter is called a PON (Passive Optical Network) system.
  • PON Passive Optical Network
  • Patent Document 1 discloses an invention intended to identify the cause when any transmission abnormality occurs in an optical fiber transmission system.
  • one optical switch and one optical transmission monitoring device are provided for a plurality of optical fiber transmission lines, and each of the plurality of optical fiber transmission lines sequentially turns on an optical switch. And is optically connected to the optical transmission monitoring device. In other words, each of the plurality of optical fiber transmission lines is sequentially monitored by the optical transmission monitoring device.
  • the inventors have found the following problems. That is, in the invention disclosed in Patent Document 1, when a transmission abnormality occurs in any one of the plurality of optical fiber transmission lines, the optical fiber transmission line in which the abnormality has occurred is specified. Further, it may take a long time to determine the cause of the transmission abnormality. For example, when it is assumed that the transmission line is composed of 2000 optical fiber transmission lines and one minute is required for the test of one optical fiber transmission line, a certain light in the 2000 optical fiber transmission lines In the worst case, 2000 minutes (33.3 hours) are required until a test is performed on the optical fiber transmission line after the transmission abnormality occurs in the fiber transmission line, and the real-time property is lacking.
  • an abnormality report from a user of the optical transmission system for example, a user at the subscriber's home that is the second station
  • the present invention has been made in order to solve the above-described problems.
  • a transmission abnormality occurs in the propagation path of signal light including the optical fiber transmission path from the first station to the second station
  • the present invention is early. It is an object of the present invention to provide an optical transmission monitoring apparatus having a structure for enabling determination of the cause of abnormality.
  • the optical transmission monitoring apparatus propagates pulse test light to a transmission path unit to be monitored among one or more transmission path units, and generates backscattered light generated during propagation of the pulse test light. Based on this, the optical transmission in the monitoring target is monitored.
  • each of the one or more transmission units includes a first station, a second station, and an optical fiber transmission line laid between the first station and the second station.
  • the optical transmission monitoring apparatus that uses one or more transmission path units as monitoring target candidates includes a monitoring unit, a measurement unit, an optical coupling unit, and a determination unit.
  • the monitoring unit identifies any transmission path unit as a monitoring target in order to monitor the optical transmission state of each of the one or more transmission path units. At this time, the monitoring unit detects whether there is a transmission abnormality in the monitoring target based on the transmission or reception status of the signal light in the first station belonging to the transmission path unit that is the monitoring target.
  • the measurement unit records measurement data obtained from the transmission unit monitored by the monitoring unit among the one or more transmission path units as reference data for each of the one or more transmission path units. At that time, the measurement unit outputs pulse test light to the optical fiber transmission line belonging to the transmission line unit to be monitored, and receives backscattered light generated in the optical fiber transmission line through which the pulse test light propagates.
  • the optical coupling unit couples the pulse test light output from the measurement unit to the optical fiber transmission line belonging to the transmission line unit monitored by the monitoring unit, and is generated in the optical fiber transmission line through which the pulse test light propagates.
  • the backscattered light is coupled to the measurement unit.
  • the determination unit determines the cause of the abnormality in the transmission line unit in which the transmission abnormality is detected by the monitoring unit. The determination of the cause of the abnormality is performed based on the state of transmission abnormality detected by the monitoring unit and the temporal change data of the intensity of backscattered light acquired by the measurement unit.
  • the transmission abnormality to be monitored includes a situation where the signal light cannot propagate between the first station and the second station (hereinafter referred to as “transmission interruption”), an increase in the bit error rate of the signal light, and the like.
  • the cause of such transmission abnormality is equipment abnormality such as transmitter abnormality or receiver abnormality in at least one of the first station side and the second station side, disconnection of the optical fiber transmission line, in the optical fiber transmission line It includes characteristic anomalies such as loss anomalies and polarization anomalies.
  • the optical coupling unit includes an optical multiplexer / demultiplexer provided corresponding to one or more transmission path units, and a switch unit.
  • Each optical multiplexer / demultiplexer has a first connection port and a second connection port that are optically connected to the first station and the second station through corresponding optical fiber transmission lines, respectively, and corresponding optical fiber transmission lines. And a measurement port for taking out backscattered light generated in a corresponding optical fiber transmission line through which the pulse test light propagates.
  • the switch unit has a structure for optically connecting any one of the measurement ports of the optical multiplexer / demultiplexer belonging to each of the one or more transmission line units and the measurement unit. This is realized by the measurement control unit.
  • the optical switch has a first input / output port provided corresponding to each measurement port of the optical multiplexer / demultiplexer, and a second input / output port optically connected to the measurement unit.
  • the measurement control unit optically connects the second input / output port to the first input / output port corresponding to the measurement port of the optical multiplexer / demultiplexer belonging to the monitored transmission path unit among the first input / output ports. Connect.
  • the measurement control unit prepares the first station wiring information (information indicating the correspondence between the first station and the optical fiber transmission line) prepared in advance and the optical switch wiring information. Based on (information indicating the correspondence between the optical fiber transmission line and the connection port of the optical switch), port switching in the optical switch is performed.
  • the accuracy of port switching in this measurement control unit depends on the accuracy of wiring information prepared in advance. In other words, when the prepared wiring information itself is incorrect, the measurement is performed on an optical fiber transmission line belonging to another transmission line unit different from the optical fiber transmission line corresponding to the first station where the transmission abnormality is detected by the monitoring unit. There is a possibility that the pulse test light from the part is transmitted.
  • an optical transmission monitoring apparatus includes a first station that constitutes one transmission path unit, a measurement port of an optical coupling unit, and an optical coupling unit prior to the start of optical transmission between the first station and the second station. You may provide the structure which builds the correspondence of an optical fiber transmission line automatically.
  • each of the optical multiplexer / demultiplexers further includes a confirmation port for extracting a part of the signal light output from the corresponding first station.
  • the optical switch includes a third input / output port provided corresponding to each confirmation port of the optical multiplexer / demultiplexer, and a fourth input / output port optically connected to one of the third input / output ports by the measurement control unit.
  • the switch unit further includes a signal detector that is optically connected to the fourth input / output port and detects signal light from any one of the first stations respectively belonging to one or more transmission path units. .
  • the first input / output port of the optical switch is connected to the measurement port of the optical multiplexer / demultiplexer
  • the second input / output port is connected to the measurement unit
  • the third input / output port is the optical multiplexer / demultiplexer.
  • the fourth input / output port is connected to a signal detector. Since the correspondence between the first and third input / output ports in the optical switch is known, if the first station that has transmitted the signal is identified based on the detection result of the signal detector, the first transmission path unit is configured. Correspondence between one station, measurement port of optical multiplexer / demultiplexer, and optical fiber transmission line can be automatically constructed.
  • the signal light propagation path of at least one of the one or more transmission path units may have a multi-branch structure.
  • one transmission line unit includes a first station, a plurality of terminal stations each corresponding to a second station, a splitter disposed between the first station and the plurality of terminal stations, It is constituted by a multi-branch optical fiber transmission line corresponding to an optical fiber transmission line that is laid between one station and a plurality of terminal stations via an optical splitter.
  • the optical transmission monitoring apparatus propagates the pulse test light from the first station side to the plurality of terminal stations on the multi-branch optical fiber transmission line in which the splitter is arranged, and at the time of the propagation Based on the generated backscattered light, optical transmission between the first station and the plurality of terminal stations is monitored.
  • the measurement unit prior to the start of optical transmission between any one of the plurality of terminal stations and the first station, the measurement unit is connected to any of the plurality of terminal stations.
  • the transmitted signal light is received by the first station, it is preferable to acquire temporal change data of the intensity of the backscattered light generated in the multi-branch optical fiber transmission line.
  • the optical transmission monitoring device is based on the temporal change data of the intensity of backscattered light acquired by the measurement unit, and is connected to the terminal station that has transmitted the signal light among the branch paths of the multi-branch optical fiber transmission path. After confirming the route, optical transmission between the first station and the terminal station that transmitted the signal light is started.
  • the determination unit detects a transmission abnormality when the monitoring unit detects an optical transmission interruption state as a transmission abnormality.
  • causes of abnormalities in the transmission line unit are any of the following: failure of the signal light transmission equipment at the first station, failure of the signal light transmission equipment at the second station, disconnection of the optical fiber transmission line, and abnormal loss of the optical fiber transmission line It is determined whether it is.
  • the determination unit transmits the signal light in the first station as the cause of the abnormality in the transmission path unit in which the transmission abnormality is detected. It may be determined whether the failure of the device, the failure of the signal light transmission device in the second station, or the loss of the optical fiber transmission line is abnormal.
  • the measurement unit preferably outputs pulse test light having a wavelength longer than the wavelength of the signal light to the optical fiber transmission line belonging to the transmission line unit in which the transmission abnormality is detected.
  • the determination unit causes a failure of the signal light transmission equipment in the first station, the first as a cause of the abnormality in the transmission line unit in which the transmission abnormality is detected. It may be determined whether the failure of the signal light transmission equipment at the two stations, the disconnection of the optical fiber transmission line, the loss abnormality of the optical fiber transmission line, or the polarization abnormality of the optical fiber transmission line.
  • the determination unit detects a signal in the first station as a cause of the abnormality in the transmission path unit in which the transmission abnormality is detected. It may be determined whether there is a failure in the optical transmission device, a failure in the signal light transmission device in the second station, a loss in the optical fiber transmission line, or a polarization abnormality in the optical fiber transmission line.
  • the optical transmission monitoring apparatus is a light for measuring a part of the power extracted by the optical coupling unit among the signal lights output from the first stations respectively belonging to one or more transmission path units.
  • a power meter may be further provided.
  • the determination unit is a measurement target based on the state of transmission abnormality detected by the monitoring unit, the temporal change data of the intensity of backscattered light measured by the measurement unit, and the measurement result by the optical power meter. Determine the cause of the abnormality in the transmission line unit.
  • the cause of the transmission abnormality can be determined at an early stage.
  • FIG. 10 is a diagram for explaining a logical structure of an OLT-optical SW information management unit in the optical transmission system shown in FIG. 9;
  • FIG. 1 is a diagram illustrating a configuration of an optical transmission system including an optical transmission monitoring apparatus according to the first embodiment.
  • the optical transmission system 1A illustrated in FIG. 1 includes N (an integer greater than or equal to 1: 1, 2,..., N,...) Transmission path units each having the same structure, and the light according to the first embodiment.
  • a transmission monitoring device 2A is provided.
  • N may be a value of about 2000.
  • the n-th transmission unit is laid between the first station 11 n , the second station 12 n , and the first station 11 n and the second station 12 n as shown in FIG.
  • An optical fiber transmission line 13 n is used, and optical transmission is performed between the first station 11 n and the second station 12 n via the optical fiber transmission line 13 n .
  • the optical transmission monitoring apparatus 2A monitors optical transmission in each of the transmission path units to be monitored among the N transmission path units.
  • N is used as a suffix of a reference number
  • n is used as a subscript of the reference number.
  • first station 11 N “second station 12 N ”, and “optical fiber transmission line 13 N ” are all the first stations, all the second stations belonging to each of the N transmission line units, All optical fiber transmission lines are shown.
  • an optical filter 14 N is provided on the optical fiber transmission line 13 N on the second station 12 N side (or immediately before the second station 12 N ).
  • An optical multiplexer / demultiplexer 15N is provided on the optical fiber transmission line 13N and on the first station 11N side.
  • the optical multiplexer / demultiplexer 15 N constitutes a part of the optical coupling unit in the optical transmission monitoring apparatus 2A according to the first embodiment, and is optically connected to the first station 11 N via the optical fiber transmission line 13 N.
  • the optical transmission monitoring apparatus 2A sets all N transmission path units as monitoring target candidates. For example, when a transmission abnormality is detected in the nth transmission path unit, the nth transmission path unit Determine the cause of the abnormalities. Therefore, the optical transmission monitoring device 2A includes an optical switch 20A, a measurement device 30, and an optical transmission abnormality determination device 50.
  • the optical transmission abnormality determination device 50 includes an optical transmission monitoring unit 51, a measurement control unit 52, an optical transmission line test unit 53, a test data management unit 54, a wiring information management unit 55, an optical switch wiring information management unit 56, and a determination unit 57. Including.
  • the optical switch 20A and the measurement control unit 52 constitute a switch unit.
  • the optical transmission monitoring unit 51 constitutes a monitoring unit that detects the transmission state in each of the N transmission path units based on the transmission or reception status of the signal light in each of the first stations 11N .
  • the measurement device 30, the measurement control unit 52, and the optical transmission line test unit 53 are configured to transmit measurement data obtained from the transmission units monitored by the optical transmission monitoring unit 51 among the N transmission line units to the N transmission lines. A measurement unit is recorded as reference data for each unit.
  • this measurement unit when the n-th transmission line unit is monitored, this measurement unit outputs pulse test light to be propagated to the optical fiber transmission line 13 n belonging to the n-th transmission line unit, while the optical fiber by receiving the backscattered light generated in the transmission path 13 n, we obtain the temporal change data of the intensity of the backscattered light.
  • the measurement control unit 52 and the optical switch 20A while coupling the OTDR light output from the measuring unit to the optical fiber transmission line 13 N, respectively, the measuring apparatus backscattered light generated in each optical fiber transmission path 13 N
  • a switch unit coupled to 30 is configured. Further, the switch portion and the above-mentioned demultiplexer 15 N constitute the optical coupling portion.
  • the first station 11 N detects that the second station 12 N is connected to the corresponding optical fiber transmission line 13 N , and notifies the optical transmission monitoring unit 51 of the detection result. Further, the first station 11 N detects a transmission abnormality with the second station 12 N (the optical transmission is in a disconnected state, or the bit error rate in the optical transmission exceeds a certain value), The detection result is notified to the optical transmission monitoring unit 51.
  • the second station 12 N connected to the optical fiber transmission path 13 N, and is connected to the optical fiber transmission path 13 N, via an optical fiber transmission path 13 N to that effect to the first station 11 N notifications To do.
  • the optical transmission monitoring unit 51 receives the notification as described above from any one of the first stations 11 N , and monitors the notified first station, for example, the n-th transmission line unit to which the first station 11 n belongs. As specified.
  • Optical switch 20A includes a demultiplexer 15 N first output port 210 connected to each of the second output port 220 connected to the measuring device 30. Connection of the first input-output port and a second output port of the optical switch 20A is controlled by the measurement control unit 52, either a selected one of the optical demultiplexer 15 N and measuring device 30 is optically with each other Connected to.
  • the measuring device 30 while outputting the pulse test light to be propagated to the optical fiber transmission path 13 N, and by receiving the backscattered light generated in the optical fiber transmission path 13 N, temporal change in the intensity of the backscattered light Get the data.
  • the measuring device 30 is preferably a device using OTDR (Optical Time Domain Reflectometry).
  • the wavelength of the pulse test light output from the measuring device 30 is different from the wavelength of the signal light transmitted and received between the first station 11 N and the second station 12 N, and the optical fiber transmission line 13 N is bent.
  • ITU-T G.I For a 625 single mode optical fiber, when the bending radius is 15 mm, the bending loss at a wavelength of 1.31 ⁇ m is about 2.33 ⁇ 10 ⁇ 2 dB / m, and the bending loss at a wavelength of 1.55 ⁇ m is 1.45 dB.
  • the bending loss at a wavelength of 1.65 ⁇ m is about 4.77 dB / m. Therefore, even if the increase in bending loss is not detectable at a wavelength of 1.31 ⁇ m, which is less than the loss measurement accuracy of OTDR of 0.01 dB, the bending loss of the optical fiber transmission line 13 N can be increased by using a longer wavelength pulse test light. Can be detected with high sensitivity.
  • the wavelength of the pulse test light is preferably 1.65 ⁇ m, which is longer than that by 100 nm.
  • Demultiplexer 15 N provided in the optical fiber transmission line 13 on N is a pulsed test light outputted from the measuring device 30 coupled to the optical fiber transmission line 13 N, resulting in an optical fiber transmission path 13 N rear The scattered light is coupled to the measuring device 30. Therefore, demultiplexer 15 N, as described above, a first connection port 15a, the second connection port 15b, the measurement port 15c least.
  • the optical filter 14 N provided on the optical fiber transmission line 13 N selectively reflects the pulse test light output from the measuring device 30 and transmits / receives it between the first station 11 N and the second station 12 N.
  • the transmitted signal light is selectively transmitted.
  • the reflection of the pulse test light at the optical filter 14 N is desirably significantly higher than the reflection of the pulse test light at the end face of the optical fiber, and the incidence of the pulse test light on the second station 12 N is substantially reduced. It is desirable to block.
  • Optical transmission monitoring unit 51 detects the presence or absence of transmission error based on the status of the first station 11 N transmission or reception of each definitive signal light. More specifically, when the first station 11 N is connected to the second station 12 N via the optical fiber transmission line 13 N and the optical transmission monitoring unit 51 can perform optical transmission without any abnormality, the first station 11 N 11 N and second station 12 N identification information, first station 11 N and second station 12 N transmission / reception power standard information, and actual signal light from second station 12 N in first station 11 N the reception power, acquired from the first station 11 N as the second station connection signal, and transmits the second station connection signal to the determination section 57.
  • the optical transmission monitoring unit 51 receives a notification that the optical transmission has been disconnected from the first station 11 n belonging to the n-th transmission path unit, for example, among the first stations 11 N , , together with the notification, the first station 11 n and the second station 12 n respective identification information optical transmission becomes disconnected state, the actual signal light transmitting power of the first station 11 n, and, in the first station 11 n The actual signal light reception power from the second station 12 n is acquired from the first station 11 n as an optical transmission interruption signal, and this optical transmission interruption signal is transmitted to the determination unit 57.
  • the optical transmission monitoring unit 51 receives a notification from the first station 11 n belonging to the nth transmission path unit that the bit error rate (hereinafter referred to as “BER”) in optical transmission has exceeded a certain value.
  • BER bit error rate
  • the first station 11 n and the second station 12 n respective identification information became BER abnormality
  • the actual signal light reception power from the second station 12 n is acquired from the first station 11 n as the optical transmission BER abnormality signal, and this optical transmission BER abnormality signal is transmitted to the determination unit 57.
  • the measurement control unit 52 controls each of the optical switch 20 ⁇ / b> A and the measurement device 30 based on an instruction from the optical transmission line test unit 53.
  • n-th transmission channel unit pulse test light from the measuring device 30 to the optical fiber transmission line 13 n belonging to (monitored) is introduced, further, the measurement device 30, an optical fiber transmission Temporal change data of the intensity of the backscattered light generated in the path 13 n is acquired.
  • test data management unit 54 determines, based on the temporal change data of the intensity of the backscattered light acquired by the measuring device 30 for each of the transmission line units to be monitored among the N transmission line units.
  • Information (measurement data) on the position and intensity of reflection of the pulse test light at the optical filter 14N in the temporal change data is stored and managed as reference data for each of the second stations 12N .
  • OLT wiring information management unit 55 is stored to manage the connection relationship between the first station 11 N and an optical fiber transmission line 13 N.
  • Light SW wiring information managing unit 56 stores the connection relation between each port and the optical fiber transmission path 13 N optical switches 20A and manage.
  • the optical transmission line test unit 53 receives a test command from the determination unit 57.
  • This test command includes a second station connection signal (a signal notifying the start of optical transmission between the first station and the second station), an optical transmission disconnection signal, or an optical transmission BER error signal (a signal indicating a transmission error).
  • identification information of each of the first station 11 n and the second station 12 n (belonging to the n-th transmission line unit to be monitored) that has notified the signal of the first station 11 N and the second station 12 N Including.
  • the optical transmission line testing unit 53 instructs the measurement control unit 52 to start a test based on information managed by the OLT wiring information management unit 55 and the optical SW wiring information management unit 56, respectively. .
  • the measurement control unit 52 causes the optical switch 20A to introduce the pulse test light from the measuring device 30 to the optical fiber transmission line 13 n to be tested.
  • the measurement apparatus 30 is controlled so as to acquire temporal change data of the intensity of the backscattered light generated due to the output pulse test light.
  • the optical transmission line test unit 53 analyzes the presence / absence and position of the pulse test light reflected by the optical filter 14 n based on the temporal change data of the intensity of the backscattered light output from the measurement control unit 52.
  • the optical transmission line test unit 53 When the optical transmission line test unit 53 receives the second station connection signal from the determination unit 57 for the nth transmission line unit to be monitored, the optical transmission line test unit 53 determines the position and intensity of reflection of the pulse test light by the optical filter 14 n. In association with the first station 11 n and the second station 12 n , the test data management unit 54 stores them as reference data.
  • the optical transmission line test unit 53 receives an optical transmission interruption signal or an optical transmission BER abnormality signal from the determination unit 57 for the nth transmission line unit to be monitored, it is stored in the test data management unit 54. Is obtained, and it is checked whether or not the reflection of the pulse test light by the optical filter 14 n is at the position of the reference data. When the reflection of the pulse test light by the optical filter 14 n is at the position of the reference data, the optical transmission line test unit 53 obtains the increment amount of the transmission loss from the start of transmission of the optical fiber transmission line 13 n . Then, the optical transmission line test unit 53 notifies the determination unit 57 of these results.
  • the determination unit 57 receives the second station connection signal, the optical transmission disconnection signal, or the optical transmission BER abnormality signal from the optical transmission monitoring unit 51 through the above-described operation.
  • the determination unit 57 When the determination unit 57 receives the second station connection signal from the optical transmission monitoring unit 51 for the n-th transmission line unit to be monitored, the determination unit 57 receives the received power standard information of the first station 11 n and the first station 11. from the difference between the actual optical signal received power from the second station 12 n of n, obtains the transmission loss margin of the optical fiber transmission line 13 n, the first station connected by the optical fiber transmission line 13 n 11 n and the The transmission loss margin is stored as the network information of the second station 12 n . The determination unit 57, make a test command for the optical fiber transmission line 13 n and notifies the first station 11 n and the second station 12 n respective identification information in the optical transmission path test unit 53.
  • the determination unit 57 receives the optical transmission interruption signal or the optical transmission BER abnormality signal from the optical transmission monitoring unit 51 for the nth transmission line unit to be monitored, the determination unit 57 receives the first station 11 n and the second station. 12 n respective identification information, the actual signal light transmitting power of the first station 11 n, the actual signal light received power from the second station 12 n of the first station 11 n, and the test performed by the optical transmission path test unit 53 Based on the result of the above, the cause of the failure is determined as to whether the transmission device of the first station 11 n or the second station 12 n is abnormal or the optical fiber transmission line 13 n is abnormal.
  • FIGS. 2 to 5 are flowcharts for explaining the determination operation in the determination unit 57 included in the optical transmission monitoring apparatus 2A according to the first embodiment.
  • FIG. 2 is a flowchart for explaining a determination operation in the determination unit 57 when an optical transmission interruption signal is received.
  • FIG. 3 is a flowchart for explaining a determination operation in the determination unit 57 when an optical transmission BER abnormality signal is received.
  • FIG. 4 is a flowchart for explaining a determination operation in the determination unit 57 when an optical transmission interruption signal is received particularly when the wavelength of the pulse test light is longer than the wavelength of the signal light by 100 nm or more.
  • FIG. 5 is a flowchart for explaining a determination operation in the determination unit 57 when an optical transmission BER abnormality signal is received particularly when the wavelength of the pulse test light is longer than the wavelength of the signal light by 100 nm or more.
  • step S11 the actual signal light transmission power is less than transmission standard of the transmission apparatus of the first station 11 n If so, it is determined that the transmission equipment of the first station 11 n is out of order.
  • step S12 the reflection of the pulsed test light by the optical filter 14 n is not in the predetermined position, it is determined that the optical fiber transmission line 13 n is broken.
  • step S13 the incremental amount of total transmission loss from the time of start of transmission of the optical fiber transmission line 13 n is equal to the transmission loss margin above, the optical fiber transmission line 13 n is determined to be abnormal loss.
  • step S14 if the actual signal light received power from the second station 12 n of the first station 11 n is in the first station 11 n of the received standard transmission equipment of the first station 11 n failure Otherwise, it is determined that the transmission equipment of the second station 12 n is out of order.
  • step S23 increments the total transmission loss from the time of start of transmission of the optical fiber transmission line 13 n Is equal to or greater than the transmission loss margin, it is determined that the optical fiber transmission line 13 n has a loss abnormality. Then, subsequent in step S24, if the actual signal light received power from the second station 12 n of the first station 11 n is in the first station 11 n of the received standard transmission equipment of the first station 11 n failure Otherwise, it is determined that the transmission equipment of the second station 12 n is out of order.
  • the transmission power from the transmission device of the first station 11 n can be obtained by measuring the transmission power with the transmission device when the transmission is abnormal.
  • the increment of the total loss of the optical fiber transmission line 13 n is obtained from the difference in the reflection peak at the optical filter 14 n between the start of transmission and the time of abnormal transmission.
  • Transmission loss margin, measure the received power at the transmission apparatus of the second station 12 n at the start transmission may be a value obtained from the difference between the equivalence same equipment receiving standard, or a preset value Also good.
  • the actual signal light reception power from the second station 12 n can be obtained by measuring the reception power with the transmission equipment of the first station 11 n at the time of abnormal transmission.
  • step S14 As the determination operation in the determination unit 57 when the optical transmission interruption signal is received when the wavelength of the pulse test light is longer than the wavelength of the signal light by 100 nm or more, as shown in FIG. 4, the operation of FIG. The operation corresponding to S14) is performed (steps S11, 12, 13A, S14) including step S13A instead of step S13, and steps S15 to S17 are performed.
  • step S13A if the overall transmission loss of the optical fiber transmission line 13n has increased since the start of transmission, the process proceeds to step S15.
  • step S15 the sum of the total transmission loss of the actual signal light received power and the optical fiber transmission line 13 n from the second station 12 n of the first station 11 n (signal light wavelength basis) of the second station 12 If it is less than the transmission standard of n , it is determined that the transmission equipment of the second station 12 n is out of order.
  • step S16 the actual optical signal received power from the second station 12 n of the first station 11 n is within the first station 11 n of the received standard transmission equipment of the first station 11 n has failed It is determined that Then, subsequent in step S17, if the incremental amount of the total transmission loss from the time of start of transmission of the optical fiber transmission line 13 n (signal light wavelength basis) of transmission loss margin above, the optical fiber transmission line 13 n is loss abnormal Otherwise, it is determined that the optical fiber transmission line 13 n has a polarization abnormality.
  • step S23A if the total transmission loss of the optical fiber transmission line 13n has increased from the start of transmission, the process proceeds to step S25.
  • step S25 the sum of the total transmission loss of the actual signal light received power and the optical fiber transmission line 13 n from the second station 12 n of the first station 11 n (signal light wavelength basis) of the second station 12 If it is less than the transmission standard of n , it is determined that the transmission equipment of the second station 12 n is out of order.
  • step S26 the actual optical signal received power from the second station 12 n of the first station 11 n is within the first station 11 n of the received standard transmission equipment of the first station 11 n has failed It is determined that Then, subsequent in step S27, if the incremental amount of the total transmission loss from the time of start of transmission of the optical fiber transmission line 13 n (signal light wavelength basis) of transmission loss margin above, the optical fiber transmission line 13 n is loss abnormal Otherwise, it is determined that the optical fiber transmission line 13 n has a polarization abnormality.
  • the optical transmission monitoring apparatus 2A determines the cause of abnormality early when a transmission abnormality (optical transmission interruption or optical transmission BER abnormality) occurs in the optical fiber transmission line. be able to.
  • a transmission abnormality optical transmission interruption or optical transmission BER abnormality
  • FIG. 6 is a diagram illustrating a configuration of an optical transmission system 1B including the optical transmission monitoring device 2B according to the second embodiment.
  • the optical transmission monitoring device 2B shown in FIG. 6 monitors optical transmission in the optical transmission system 1B.
  • the optical transmission system 1B also includes N (an integer of 1 or more: 1, 2,..., N,...) Transmission path units each having the same structure, and the optical transmission monitoring apparatus 2B according to the second embodiment. .
  • the n-th transmission unit is laid between the first station 11 n , the second station 12 n , and the first station 11 n and the second station 12 n as shown in FIG.
  • An optical fiber transmission line 13 n is used, and optical transmission is performed between the first station 11 n and the second station 12 n via the optical fiber transmission line 13 n .
  • the optical transmission monitoring device 2B according to the second embodiment also sequentially monitors the optical transmission in each of the transmission path units that are monitored among the N transmission path units. Transmits and receives signal light through an optical fiber transmission line 13 N installed between the first station 11 N and the second station 12 N.
  • an optical filter 14 N is provided on the optical fiber transmission line 13 N on the second station 12 N side (or immediately before the second station 12 N ). Further, an optical multiplexer / demultiplexer 16N is provided on the optical fiber transmission line 13N and on the first station 11N side.
  • the demultiplexer 16 N serves to constitute part of the optical coupling part of the optical transmission monitoring apparatus 2B according to the second embodiment, the first station 11 N and optically via an optical fiber transmission path 13 N introducing a first connection port 16a to be connected, a second connection port which is the second station 16 N optically connected via an optical fiber transmission path 13 N, to the optical fiber transmission line 13 N a pulse test light to It has a measuring port 16c for the check port 16d for taking out part of the signal light outputted from the first station 11 N.
  • the optical transmission monitoring apparatus 2B includes an optical switch 20B, a measuring device 30, an optical power meter 40, and an optical transmission abnormality determination device 50.
  • the optical transmission abnormality determination device 50 includes an optical transmission monitoring unit 51, a measurement control unit 52, an optical transmission line test unit 53, a test data management unit 54, an OLT wiring information management unit 55, an optical SW wiring information management unit 56, and a determination unit 57. including.
  • the optical transmission monitoring apparatus 2B according to the second embodiment shown in FIG. 6, demultiplexer 15 N ( It differs in including an optical multiplexer 16 N instead of 1), in place of the optical switch 20A differs in that it includes an optical switch 20B, also differs in that it further includes an optical power meter 40.
  • Demultiplexer 16 N is a pulsed test light coming from the optical switch 20B is introduced to the optical fiber transmission line 13 N, and outputs the backward scattered light generated in the optical fiber transmission path 13 N to the optical switch 20B, also, the signal light coming through the optical fiber transmission path 13 N from the first station 11 N outputs to the optical switch 20B. Therefore, demultiplexer 16 N, as described above, a first connection port 16a, a second connection port 16b, the measuring port 16c, the check port 16d least.
  • Optical switch 20B includes a demultiplexer 16 N measurement ports 16a and the first output port 210 which is optically connected to a measuring device 30 and the second input port 220 is optically connected, also , and a third input-output port 230 which is connected confirmed port 16d and the optically optical demultiplexer 16 N, the optical power meter 40 and the fourth output port 240 that are optically connected.
  • Port switching in the optical switch 20B is controlled by the measurement control unit 52, the demultiplexer 16 n belonging to the n-th transmission channel unit of the demultiplexer 16 N is selected, the selected optical wavelength division In order to optically connect the wave device 16 n and the measuring device 30, the corresponding port of the first input / output port 210 and the second input / output port 220 are connected.
  • the optical switch 20B optically connects the selected optical multiplexer / demultiplexer 16n and the optical power meter 40 under the control of the measurement control unit 52.
  • the fourth input / output port 220 is connected.
  • the optical power meter 40 monitors the power of the signal light output from the first station 11 n via the optical switch 20B and the optical fiber transmission line 13 n .
  • Optical switch 20B includes a demultiplexer 16 N measurement ports 16a and the first output port 210 which is optically connected to a measuring device 30 and the second input port 220 is optically connected, also , and a third input-output port 230 which is connected confirmed port 16d and the optically optical demultiplexer 16 N, the optical power meter 40 and the fourth output port 240 that are optically connected.
  • Port switching in the optical switch 20B is controlled by the measurement control unit 52, the demultiplexer 16 n belonging to the n-th transmission channel unit of the demultiplexer 16 N is selected, the selected optical wavelength division In order to optically connect the wave device 16 n and the measuring device 30, the corresponding port of the first input / output port 210 and the second input / output port 220 are connected.
  • the optical switch 20B optically connects the selected optical multiplexer / demultiplexer 16n and the optical power meter 40 under the control of the measurement control unit 52.
  • the fourth input / output port 220 is connected.
  • the optical power meter 40 monitors the power of the signal light output from the first station 11 n via the optical fiber transmission line 13 n connected via the optical switch 20B.
  • the measurement control unit 52 sets each of the optical switch 20B, the measuring device 30, and the optical power meter 40 based on an instruction from the optical transmission line test unit 53. Control. At this time, the measurement control unit 52 acquires the monitoring result of the output signal light power of the first station 11 n by the optical power meter 40.
  • the optical transmission line test unit 53 receives a test command from the determination unit 57 for the nth transmission line unit to be monitored.
  • This test command includes a second station connection signal, an optical transmission disconnection signal, or an optical transmission BER abnormality signal, and also includes identification information of each of the first station 11 n and the second station 12 n .
  • the optical transmission line test unit 53 receives the monitoring result of the output signal light power of the first station 11 n from the optical power meter 40 from the measurement control unit 52 and sends it to the determination unit 57.
  • the first station 11 n outputs the n-th transmission line unit to be monitored even when the output signal light power cannot be monitored at the first station 11 n .
  • the optical power meter 40 can monitor the power of the signal light.
  • the determination unit 57 uses this monitoring result to determine the cause early when a transmission abnormality (optical transmission interruption or optical transmission BER abnormality) occurs in the optical fiber transmission line, as in the case of the first embodiment. be able to.
  • FIG. 7 is a diagram illustrating a configuration of an optical transmission system 1C including the optical transmission monitoring apparatus 2C according to the third embodiment.
  • the optical transmission monitoring device 2C shown in FIG. 7 monitors optical transmission in the optical transmission system 1C.
  • the optical transmission system 1C also includes N (an integer of 1 or more: 1, 2,..., N,...) Transmission path units each having the same structure, and the optical transmission monitoring apparatus 2B according to the third embodiment.
  • the optical transmission system 1C is a PON system, and the signal light propagation path of each transmission path unit has a multi-branch structure.
  • n-th transmission unit as shown in FIG.
  • a first station 11 n a plurality of terminal stations 12 n, 1 corresponding to the second station 12 n, 12 n, 2, 12 n, 3 (hereinafter simply referred to as the second station n, M (M is an integer of 2 or more)), a multi-branch optical fiber transmission laid between the first station 11 n and the plurality of second stations 12 n, M It is composed of roads.
  • the multi-branch optical fiber transmission line has a splitter 17 n , an optical fiber transmission line 13 n laid between the first station 11 n and the splitter 17 n , the splitter 17 n, and a plurality of second stations.
  • optical transmission monitoring apparatus 2C also sequentially monitors the optical transmission in each of the transmission path units that are monitored among the N transmission path units.
  • the first station 11 N and the second station 12 N, M transmit and receive signal light via the optical fiber transmission line 13 N , the splitter 17 N, and the optical fiber transmission line 18 N, m .
  • the optical transmission monitoring apparatus 2C uses N transmission path units including multi-branch optical fiber transmission lines as monitoring target candidates, for example, light belonging to the nth transmission line unit that is the monitoring target.
  • the pulse test light propagates from the first station 11 n side to the second station 12 n, M side through the fiber transmission line 13 n and the optical fiber transmission line 18 n, M , and is generated when the pulse test light propagates.
  • the optical transmission monitoring apparatus 2A according to the first embodiment has a configuration similar to that of the optical transmission monitoring apparatus 2A so as to monitor optical transmission based on backscattered light.
  • the optical fiber transmission line 18 n, m (M optical fiber transmissions connected to the optical fiber line 13 n via the splitter 17 n with respect to the monitored n-th transmission line unit).
  • the second station 12 n, m newly connected to the m-th optical fiber transmission line of the paths 18 n, M transmits a signal light indicating the connection to the first station 11 n .
  • the first station 11 n receives the signal light, recognizes that the second station 12 n, m is newly connected to the optical fiber transmission line 18 n, m , and notifies the optical transmission monitoring unit 51 is notified.
  • the optical transmission monitoring unit 51 further notifies the determination unit 57 of this fact.
  • the optical transmission line test unit 53 determines the information indicating that the second station 12 n, m is newly connected to the optical fiber transmission line 18 n, m for the n-th transmission line unit to be monitored. And the presence or position of reflection of the pulse test light by the optical filter 14 n, m is analyzed based on the data of the temporal change in the intensity of the backscattered light acquired by the measuring device 30. At this time, the optical transmission line test unit 53 refers to the position and intensity of reflection of the pulse test light by the optical filter for the existing second station stored in the test data management unit 54, and the intensity of the backscattered light The existence of a route to the new second station 12 n, m is confirmed on the basis of the data of the time change.
  • the optical transmission line test unit 53 refers to only the n-th transmission line unit, and when the existence of the path to the new second station 12 n, m can be confirmed, the new second station 12 n, the optical filter 14 n corresponding to m, the position and intensity of the reflected pulsed test light by m, the first station 11 n and the second station 12 n, in association with m, the test as reference data the data management unit 54 Remember me. Further, when the existence of a route to the new second station 12 n, m can be confirmed, transmission between the first station 11 n and the new second station 12 n, m is started.
  • the determination unit 57 determines the cause early when a transmission abnormality (optical transmission interruption or optical transmission BER abnormality) occurs in the optical fiber transmission line. can do.
  • the second station 12 m, m when the second station 12 m, m is newly connected to the optical fiber transmission line 18 n, m , the second station 12 n, the optical filter 14 n corresponding to m, it is possible to perform the mounting confirmation and performance verification of m, transmission and reception of the signal light between the first station 11 n and the second station 12 n, m after these confirmation It can be performed.
  • the mounting position of the optical filter 14 n, m can also be confirmed, so that the intensity of the backscattered light acquired by the measuring device 30 can be confirmed.
  • the mounting position of the optical filter 14 n, m can be adjusted so that the position of reflection by each optical filter can be identified in the temporal change data.
  • the measurement control unit 52 includes the first station wiring information recorded in the OLT wiring information management unit 55 prepared in advance and the optical SW wiring information management unit 56. Are switched on the basis of the optical switch wiring information recorded in the optical switch 20A and 20B.
  • the accuracy of port switching in the measurement control unit 52 depends on the accuracy of wiring information prepared in advance. That is, the wiring information recorded in the OLT wiring information management unit 55 and the optical SW wiring information management unit 56 is information that is manually registered based on the construction information, and input errors and human power delays occur. there's a possibility that. Therefore, when the pre-registered wiring information itself is incorrect, a desired test cannot be performed on the transmission line unit specified by the monitoring unit. Further, the test cannot be performed unless the wiring information is registered in the OLT wiring information management unit 55 and the optical SW wiring information management unit 56.
  • FIG. 8 is a diagram illustrating a configuration around the optical coupling unit in the optical transmission monitoring apparatus according to the fourth embodiment.
  • FIG. 9 is a diagram illustrating a configuration of an optical transmission system including the optical transmission monitoring device 2D according to the fourth embodiment.
  • FIG. 10 is a diagram for explaining a logical structure of the OLT-optical SW information management unit 500 in the optical transmission system 1D shown in FIG.
  • the optical transmission system 1D shown in FIG. 9 includes N transmission units each having a multi-branch structure for signal light propagation paths, and an optical transmission monitoring device 2D according to the fourth embodiment.
  • each transmission unit of the optical transmission system 1D is configured by the same multi-branch optical fiber transmission line as each transmission line unit in the optical transmission system 1C shown in FIG. Note that some or all of the N transmission units of the optical transmission system 1D may have the same structure as each transmission path unit shown in FIGS.
  • the optical coupling unit (configured in the optical multiplexer / demultiplexer and the switch unit) is the same as the configuration of the optical coupling unit shown in FIG. 6 except for the configuration of the switch unit.
  • the switch unit in the fourth embodiment is the same as the configuration of the switch unit shown in FIG. 6 except that a signal detector 300 is provided instead of the optical power meter 40 of the switch unit shown in FIG. It is. That is, as shown in FIG. 8, the optical coupling unit according to the fourth embodiment includes an optical multiplexer / demultiplexer 16 N arranged on each of the optical fiber transmission lines 13 N belonging to the N transmission line units.
  • the switch part is provided.
  • the switch unit includes an optical switch 20 ⁇ / b> C, a measurement control unit 52, and a signal detector 300.
  • the optical transmission abnormality determination device 50 in FIG. 9 includes an OLT-optical SW information management unit 500 in place of the OLT wiring information management unit 55 and the optical SW wiring information management unit 56. This is different from the optical transmission monitoring apparatuses 2A to 2C according to the first to third embodiments described above.
  • the configuration of the optical transmission monitoring apparatus 2D according to the fourth embodiment is the same as the optical transmission lines according to the first to third embodiments except for the structures of the optical coupling unit and the optical transmission abnormality determining apparatus. This is the same as one of the monitoring devices 2A to 2C, and a duplicate description is omitted.
  • the optical demultiplexer 16 N is a pulsed test light coming from the optical switch 20C is introduced into the optical fiber transmission path 13 N, resulting in an optical fiber transmission path 13 N rear outputting scattered light to the optical switch 20C, also outputs the signal light coming through the optical fiber transmission path 13 N from the first station 11 N to the optical switch 20C.
  • demultiplexer 16 N constitute a part of the optical coupling part of the optical transmission monitoring apparatus 2D according to the fourth embodiment, the first station 11 N and optically via an optical fiber transmission path 13 N a first connection port 16a which is connected to, via an optical fiber transmission path 13 N plurality of second station 16 N, a second connection port 16b to be M and optically connected to the optical fiber transmission path 13 N It has a measuring port 16c for introducing a pulse test light, the confirmation port 16d for taking out part of the signal light outputted from the first station 11 N.
  • the optical switch 20C includes a demultiplexer 16 N measurement ports 16a and the first output port 210 which is optically connected to a measuring device 30 and the second output port 220 is optically connected , also has a third output port 230 connected confirmed port 16d and the optically optical demultiplexer 16 N, the signal detector 300 and the fourth output port 240 that are optically connected. Port switching in the optical switch 20C is controlled by the measurement control unit 52, the demultiplexer 16 n belonging to the n-th transmission channel unit of the demultiplexer 16 N is selected, the selected optical wavelength division In order to optically connect the wave device 16 n and the measuring device 30, the corresponding port of the first input / output port 210 and the second input / output port 220 are connected.
  • the optical switch 20C optically connects the selected optical multiplexer / demultiplexer 16n and the signal detector 300 under the control of the measurement control unit 52.
  • the fourth input / output port 220 is connected.
  • the signal detector 300 can detect the signal light output from the first station 11 n via the optical switch 20C and the optical fiber transmission line 13 n .
  • optical transmission is started between the first station 11 n belonging to the nth transmission path unit and the mth second station 12 n, m .
  • the optical transmission monitoring unit 51 detects a new transmission start signal of the first station 11 n, and notifies the identification number of the first station 11 n to the determination section 57.
  • the determination unit 57 controls the optical switch 20C and the signal detector 300 via the optical transmission line test test unit 53 and the measurement control unit 52.
  • the measurement control unit 52 starts transmission while checking the detection result of the signal detector 300 while switching the connection state between each of the third input / output ports 230 and the fourth input / output port 240 in the optical switch 20C.
  • the third input / output port 230 corresponding to the first station 11 n is searched and detected. However, in this port search, the third input / output port 230 of the port number already registered in the OLT Ikko SW information management unit 500 is excluded from the search target.
  • the determination unit 57 records the relationship between the detected identification number of the first station and the port number of the third input / output port 230 in the OLT-optical SW information management unit 500. And manage.
  • the logical structure of the OLT-optical SW information management unit 500 is as shown in FIG. 10, for example.
  • the first input port 210 in the optical switch 20C (demultiplexer 16 N each measurement port 16c is connected)
  • the optical switch 20C third output port 230 (demultiplexer 16 N, respectively relationship with to) connection confirmation port 16d is the optical multiplexer 16 N each measurement port 16c and the confirmation port 16d is connected to the optical switch 20C so as to satisfy a predetermined relationship.
  • This predetermined relationship is, for example, the port number of the first input / output port 210 to which the measurement port 16c of the nth optical multiplexer / demultiplexer 16n is connected and the third input / output to which the confirmation port 16d is connected.
  • a relationship in which the port number of the port 230 is represented by a predetermined calculation formula.
  • the OLT-optical SW information management unit 500 does not manage the correspondence between the first input / output port 210 and the third input / output port 230.
  • the optical transmission monitoring unit 51 newly starts transmission from any one of the unmanaged first stations (first station 11 1 to first station 11 n-1 , first station 11 n + 1 to first station 11 N ). Is transmitted, the new transmission start signal of the new first station is detected, and the identification number of the new first station is notified to the determination unit 57. Upon receiving the notification, the determination unit 57 newly registers the detected new first station in the OLT-optical SW information management unit 500 as “first station for starting new transmission”. Then, when the third input / output port 230 corresponding to the new first station in the optical switch 20C is found, it is added to the management as “detected OLT”.
  • the determination unit 57 receives the new transmission start signal when the measurement control unit 52 detects the port number of the third input / output port 230 corresponding to the first station that has transmitted the new transmission start signal.
  • the relationship between the transmitted first station and the corresponding port number of the third input / output port 230 in the optical switch 20C is sequentially recorded in the OLT-optical SW information management unit 500 (see FIG. 10).
  • the determination unit 57 receives a notification from the optical transmission monitoring unit 51 that detects the removal of the first station, and sends it to the OLT-optical SW information management unit 500.
  • the information regarding the removed first station is deleted from the recorded related information.
  • the signal detector 300 monitors the signal light transmitted from the first station 11 n connected via the optical switch 20C and the optical fiber transmission line 13 n, and the first signal in the transmission frame constituted by this signal light.
  • This is an apparatus that extracts the identification number of the station 11 n and notifies the measurement control unit 52 of the extracted identification number.
  • the determination unit 57 collates the identification number of the first station that has transmitted the new transmission start signal notified from the optical transmission monitoring unit 51 with the identification number extracted by the signal detector 300. As a result, when the identification number notified by the optical transmission monitoring unit 51 matches the identification number extracted by the signal detector 300, the determination unit 57 determines that the correct port number of the third input / output port 230 in the optical switch 20C is “detected”. It was judged.
  • an ONU having a predetermined ONU identification number may be used as the signal detector 300.
  • the optical transmission monitoring unit 51 communicates with the ONU having the specified identification number from the first station.
  • the port number of the third input / output port 230 in the optical switch 20C can be detected.
  • the corresponding port number of the third input / output port 230 in the optical switch 20 can be detected while identifying the first station that has transmitted the new transmission start signal, a plurality of first stations can simultaneously perform new transmission.
  • the port numbers corresponding to the plurality of first stations of the third input / output port 230 in the optical switch 20C can be correctly detected.
  • the correct port number (corresponding to each of the plurality of first stations of the third input / output port 230 in the optical switch 20C) is also applied to the plurality of first stations that are turned on collectively at the time of initial OLT construction or the like. Port number) can be detected.
  • the port number corresponding to the first station (the port number of the third input / output port 230 in the optical switch 20C) is stored in the OLT-optical SW information management unit 500 as described above.
  • the transmission path unit in which the correspondence relationship is registered can be monitored. Therefore, for example, if the correspondence relationship between the first station 11 n and the port number of the third input / output port 230 in the n-th transmission line unit is registered in the OLT-optical SW information management unit 500, The transmission line unit monitoring operation is performed in the same manner as in the first to third embodiments.
  • the method for specifying the port number of the first input / output port 210 in the optical switch 20C to which the pulse test light output from the measuring device 30 is guided is different. That is, when a signal is sent from the first station 11 n to the optical transmission monitoring unit 51, the optical transmission monitoring unit 51 notifies the determination unit 57 of the identification number of the first station 11 n .
  • the determination unit 57 acquires the port number of the third input / output port 230 corresponding to the first station 11 n from the correspondence registered in the OLT-optical SW information management unit 500, and from the acquired port number, the first number
  • the corresponding port number of the input / output port 210 is obtained by calculation according to the structure of the optical switch 20C, and the pulse test light output from the measuring device 30 is converted to the corresponding port number of the first input / output port 210 obtained by calculation. Combine.
  • the first input-output port 210 in the optical switch 20C is connected to the measurement port 16c of the optical multiplexer 16 N
  • the second input-output port 220 is connected to the measuring device 30
  • the output port 230 is connected to the confirmation port of the optical multiplexer / demultiplexer 16 N
  • the fourth input / output port 240 is connected to the signal detector 300.
  • the optical transmission monitoring apparatus 2D Since correspondence between the first and third input / output ports 210 and 230 in the optical switch 20C is known, if the first station that has transmitted the new transmission start signal is identified based on the detection result of the signal detector 300, 1 Correspondence relationships between the first station, the optical multiplexer / demultiplexer measurement port, and the optical fiber transmission line constituting one transmission line unit can be automatically constructed. Therefore, according to the optical transmission monitoring apparatus 2D according to the fourth embodiment, the OLT wiring information management unit 55 and the optical SW wiring information management unit 56 in the first to third embodiments are not required (these management units). The registration work and management to 55 and 56 are unnecessary).
  • the OLT optical switch information management unit 500 it is possible to easily find the third input / output port 230 that is not currently used for monitoring due to the removal of the first station or the like. Become. As a result, effective use of the port, such as port reuse in the optical switch 20C, can be easily and accurately performed.
  • FIG. 11 is a diagram illustrating a configuration around the optical coupling unit in the optical transmission monitoring apparatus according to the fifth embodiment.
  • the configuration of the optical transmission monitoring apparatus according to the fifth embodiment is substantially the same as the optical transmission monitoring apparatus 2D (FIG. 9) according to the fourth embodiment described above, except for the optical switch 20D included in the optical coupling unit. The same.
  • the optical switch 20D in the fifth embodiment is different from the optical switch 20C in the fourth embodiment in the port switching mechanism.
  • a second input / output port 220 (connected to the measuring device 30) and a fourth input / output port 240 (connected to the signal detector 300) are shown in the drawing.
  • the head 250 that can move in the direction indicated by the arrow A or B is fixed with a constant interval (in FIG. 11, an interval at which three ports can be arranged).
  • four first input / output ports 210 and four third input / output ports 230 are alternately arranged.
  • the optical switch 20D in the fifth embodiment when the fourth input / output port 240 is connected to any of the third input / output ports 230, the second input / output port 220 connected to the measuring apparatus 30 is automatically Are connected to the first input / output port 210 corresponding to.
  • the construction operation of the OLT-optical SW information management unit 500 performed prior to the monitoring operation for each of the N transmission line units is the same as that in the fourth embodiment described above. It is the same.
  • the monitoring operation after the construction operation is the same as that of the optical transmission monitoring apparatuses 2A to 2C according to the first to third embodiments.
  • FIG. 12 is a diagram illustrating a configuration around the optical coupling unit in the optical transmission monitoring apparatus according to the sixth embodiment.
  • Any of the optical switches 20A to 20D in the first to fifth embodiments described above may be applied to the optical coupling unit in the sixth embodiment.
  • the signal detector 300 and the optical power meter 40 are connected to the fourth input / output port 240 in the optical switches 20A to 20D via the switch 330 (SW) that is switch-controlled by the measurement control unit 52. It is connected.
  • SW switch 330
  • the optical transmission monitoring apparatus according to the sixth embodiment is the optical transmission monitoring apparatus according to the above-described fourth embodiment.
  • the same operation as 2D (FIG. 9) is performed.
  • the structure of the optical transmission monitoring apparatus according to the sixth embodiment determines the connection target of the fourth input / output port 240. Except for this, it is the same as the optical transmission monitoring apparatus 2D (FIG. 9) according to the fourth embodiment described above.
  • the monitoring operation is the same as the monitoring operation of the optical transmission monitoring apparatus 2B (FIG. 6) according to the second embodiment described above.
  • the optical transmission monitoring apparatus according to the fourth to sixth embodiments described above is used (the optical transmission monitoring apparatus according to the first to third embodiments described above may be used).
  • the optical transmission monitoring apparatus In order to easily search for optical multiplexers / demultiplexers in the non-working state and to perform removal, replacement, reuse, etc. of these non-working equipment without worrying about the optical transmission in the working state.
  • the structure is further provided.
  • the structure of the optical transmission monitoring apparatus according to the seventh embodiment may be the same as that of the optical transmission monitoring apparatus 2D according to the fourth embodiment described above, but the structure around the determination unit 57 is different. Specifically, as shown in the area (a) of FIG. 13, the determination unit 57 manages the OLT-optical SW information management unit 500 as well as the communication status management unit as in the fourth embodiment. 510 is also managed.
  • the determination unit 57 includes information (OLT-optical SW information management unit 500) that is automatically constructed prior to the start of optical transmission between the first station and the second station. 3) and the information related to the communication state between the first station and the second station (OLT-ONU communication state) managed by the communication state management unit 510, the third input / output in the optical switch Of the ports 230, it is detected which port is a port for an inactive optical transmission line that is not used for optical transmission between the first station and the second station, and the information is registered in the communication status management unit 510. I will do it.
  • the detection results are sequentially registered as shown in the area (b) of FIG.
  • the OLT-optical SW information management unit 500 the relationship between the identification number of the first station and the corresponding port number of the third input / output port 230 in the optical switch is registered.
  • the optical switch is installed beside an optical multiplexer / demultiplexer (an optical multiplexer / demultiplexer belonging to each of N transmission path units), and the port of the optical switch and the corresponding port in each of the optical multiplexer / demultiplexers are about 5 m. It is simply connected with one optical fiber cord.
  • the optical switch registered in the communication status management unit 510, if the optical fiber cord between the optical switch and the optical multiplexer / demultiplexer is visually followed, the optical multiplexer / demultiplexer in the non-active state, and The optical fiber transmission line on the first station side and the optical fiber optical transmission line on the second station side connected to the optical multiplexer / demultiplexer can be easily found.
  • the optical fiber cord between the optical switch and the optical multiplexer / demultiplexer does not participate in the optical transmission between the first station and the second station, so it can be disconnected from the optical switch at any time. Does not come out).
  • optical transmission monitoring apparatus According to the optical transmission monitoring apparatus according to the seventh embodiment, operations such as removal, replacement, and reuse of these non-active facilities can be performed without affecting the optical transmission in the active state. It becomes possible to carry out.

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  • Testing Of Optical Devices Or Fibers (AREA)

Abstract

L'invention porte sur un appareil de surveillance de transmission optique qui est pourvu d'une structure pour déterminer, à une étape précoce, la cause d'une anomalie de transmission qui est apparue dans le chemin de propagation d'un signal optique. L'appareil de surveillance de transmission optique (2A) est un appareil qui propage une impulsion d'essai optique d'un côté de première station (11n) à un côté de seconde station (12n) dans un chemin de transmission à fibre optique (13n), et qui surveille la transmission optique selon la lumière rétrodiffusée générée dans cette propagation. L'appareil de surveillance de transmission optique (2A) est pourvu d'un commutateur optique (20), d'un appareil de mesure (30) et d'un appareil de détermination d'anomalie de transmission optique (50). L'appareil de détermination d'anomalie de transmission optique (50) comprend une unité de surveillance de transmission optique (51), une unité de commande de mesure (52), une unité d'essai de chemin de transmission optique (53), une unité de gestion de données d'essai (54), une unité de gestion d'informations de câblage (55), une unité de gestion d'informations de câblage de commutateur optique (56) et une unité de détermination (57). L'unité de surveillance de transmission optique (51) détecte des anomalies de transmission dans le chemin de propagation d'un signal optique allant de la première station (11n) à la seconde station (12n), en fonction de l'état d'émission ou de réception du signal optique au niveau de la première station (11n).
PCT/JP2010/051797 2009-03-02 2010-02-08 Appareil de surveillance de transmission optique WO2010101001A1 (fr)

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CN201080010429.9A CN102342045B (zh) 2009-03-02 2010-02-08 光传送监视装置
JP2011502700A JP5200159B2 (ja) 2009-03-02 2010-02-08 光伝送監視装置

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JP2009-047907 2009-03-02
JP2009047907 2009-03-02

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CN (1) CN102342045B (fr)
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JP2012156612A (ja) * 2011-01-24 2012-08-16 Netstep Co Ltd 光ネットワークの障害監視検出装置、方法、プログラム及びシステム
JP2015083936A (ja) * 2013-10-25 2015-04-30 東日本電信電話株式会社 光ファイバ伝送路モニタ装置及び光ファイバ伝送路モニタシステム
JP2017521981A (ja) * 2014-06-27 2017-08-03 ソリッド システムズ インコーポレイテッド 光通信線路監視装置及び方法
JP2019086461A (ja) * 2017-11-09 2019-06-06 日立金属株式会社 光ケーブル監視システム
EP3820058A1 (fr) * 2019-11-07 2021-05-12 SOLiD, INC. Système et méthode de surveillance du signal d'une station de base
WO2022195724A1 (fr) * 2021-03-16 2022-09-22 日本電信電話株式会社 Système de test de ligne optique, procédé de test de ligne optique, dispositif terminal d'opération et programme
EP4108198A4 (fr) * 2020-02-20 2024-03-06 Furukawa Electric Co., Ltd. Système et procédé d'évaluation de l'état de connexion de fibres optiques

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WO2022195724A1 (fr) * 2021-03-16 2022-09-22 日本電信電話株式会社 Système de test de ligne optique, procédé de test de ligne optique, dispositif terminal d'opération et programme
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CN102342045A (zh) 2012-02-01
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JPWO2010101001A1 (ja) 2012-09-06
TW201126930A (en) 2011-08-01
TWI422173B (zh) 2014-01-01

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