WO2009145066A1 - Système de communication optique, procédé de communication optique et dispositif relais - Google Patents

Système de communication optique, procédé de communication optique et dispositif relais Download PDF

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Publication number
WO2009145066A1
WO2009145066A1 PCT/JP2009/058983 JP2009058983W WO2009145066A1 WO 2009145066 A1 WO2009145066 A1 WO 2009145066A1 JP 2009058983 W JP2009058983 W JP 2009058983W WO 2009145066 A1 WO2009145066 A1 WO 2009145066A1
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WIPO (PCT)
Prior art keywords
signal
measurement
relay
remote
measurement request
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Application number
PCT/JP2009/058983
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English (en)
Japanese (ja)
Inventor
繁和 原田
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日本電気株式会社
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Publication of WO2009145066A1 publication Critical patent/WO2009145066A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging

Definitions

  • the present invention relates to an optical communication system.
  • an optical transmission path is formed between a plurality of remote devices for subscribers and a higher-level station device.
  • PON Passive Optical Network
  • G.983 series G.984 series of ITU-T recommendation.
  • a PON is a network in which an OLT (Optical Line Termination) corresponding to a station apparatus and a plurality of ONUs (Optical Network Unit) corresponding to remote devices under the station are connected in a star shape via an optical splitter.
  • the PON wavelength-multiplexes upstream / downstream signals by TDMA (Time Division Multiple Access) / TDM (Time Division Multiplex) and performs one-way bidirectional transmission.
  • TDMA Time Division Multiple Access
  • TDM Time Division Multiplex
  • Patent Document 1 proposes a technique for increasing the number of ONUs accommodated in the OLT.
  • Patent Document 2 proposes a technique for facilitating management of an optical repeater provided between the OLT and the ONU.
  • the transmission delay time between the station device (OLT) and each remote device (ONU) is not only the physical transmission distance, but also the optical transmitter of the remote device that transmits the upstream signal and the station device that receives the signal Depends on the performance of the optical receiver.
  • the maximum transmission distance between the OLT and each ONU is defined as 20 Km according to G.984.2 of the ITU-T recommendation.
  • a measurement downlink signal is transmitted from the OLT to the ONU, and the ONU that receives it transmits a measurement uplink signal to the OLT.
  • the time from the transmission of the measurement downlink signal to the reception of the measurement uplink signal corresponds to the transmission delay time.
  • the OLT provides a time zone during which no uplink signal other than for measurement is received in order to receive the measurement uplink signal from each ONU. This time zone is called a window.
  • the transmission delay time between the OLT and the ONU having the maximum transmission distance from the OLT is applied to the window so that the measurement uplink signals from all the ONUs can be received.
  • the time width of the window needs to be 100 ⁇ s. This means that user data for 100 ⁇ s cannot be communicated each time measurement is performed.
  • the transmission delay time increases with the extension, so a larger window. Need to be set.
  • the bandwidth that can be used for purposes other than measurement, such as user data communication, of the bandwidth of the uplink signal is reduced.
  • An object of the present invention is to provide an optical communication system that suppresses an increase in the window period accompanying the extension of the maximum transmission distance between a station apparatus and a remote apparatus.
  • An optical communication system includes a station apparatus, a plurality of remote apparatuses that communicate with the station apparatus an uplink signal / downlink signal wavelength-multiplexed by TDMA (Time Division Multiple Access) / TDM (Time Division Division Multiplex), A relay device that relays between the station device and the plurality of remote devices, and an optical splitter that connects the relay device and the plurality of remote devices in a star shape, and the relay device is used for measurement from each of the remote devices. Delay measurement in which a window period during which no uplink signal other than an uplink signal is received is triggered by a measurement request signal from the station apparatus, and a transmission delay time between the relay apparatus and each remote apparatus is measured within the window period.
  • TDMA Time Division Multiple Access
  • TDM Time Division Division Multiplex
  • a measurement result insertion unit that inserts the measurement result into an upstream signal to the station device, the station device generates the measurement request signal, and performs the measurement A control unit for determining a delay amount to be applied to transmission of an uplink signal by each remote device using a measurement result from the relay device regarding a solicitation signal, and generating a delay instruction signal describing the delay amount; and the measurement An insertion unit that inserts the request signal and the delay instruction signal into a downstream signal to each of the remote devices.
  • the optical communication method includes a plurality of remote devices that communicate with uplink / downlink signals wavelength-multiplexed by TDMA (Time Division Multiple Access) / TDM (Time Division Multiplex), a station device, and the station device and the plurality of signals.
  • TDMA Time Division Multiple Access
  • TDM Time Division Multiplex
  • the station device generates a measurement request signal and inserts the measurement request signal into a downstream signal to each remote device and transmits it.
  • the relay apparatus starts a window period in which no uplink signal other than the measurement uplink signal from each remote apparatus is received, triggered by the measurement request signal from the station apparatus, and the relay apparatus and the relay apparatus within the window period.
  • a transmission delay time between each remote device is measured, and each remote device uses the measurement result from the relay device regarding the measurement request signal transmitted by the station device. According to determine the amount of delay to be applied to transmission of the uplink signal, and transmits by inserting the delay instruction signal describing the delay in the downlink signal of the to each remote device.
  • the relay device relays a station device and a plurality of remote devices communicating with the station device an uplink signal / downlink signal wavelength-multiplexed by TDMA (Time Division Multiple Access) / TDM (Time Division Division Multiplex),
  • a measurement request signal from the station device is a relay device connected to each remote device in a star shape by an optical splitter and does not accept an upstream signal other than the measurement upstream signal from each remote device.
  • a delay measurement unit that measures a transmission delay time between the relay device and each remote device within the window period, and a measurement result that inserts the measurement result into an upstream signal to the station device An insertion portion.
  • FIG. 1 shows a configuration of an embodiment of a system according to the present invention.
  • the system 100A of the present embodiment includes a relay device 10, a station device 20, a plurality of remote devices 30 (30-1, 30-2,..., 30-n), and an optical splitter 40.
  • the system 100A is an optical network that performs single-core bidirectional transmission of uplink / downlink signals wavelength-multiplexed by TDMA / TDM.
  • the relay device 10 is interposed between the station device 20 that communicates the upstream signal / downstream signal and the plurality of remote devices 30.
  • the relay device 10 and the plurality of remote devices 30 are connected in a star shape by an optical splitter 40 as shown in FIG.
  • the repeater 10 includes wavelength demultiplexing units 101 and 107, a burst signal receiving unit 102, an upstream signal receiving unit 103, a delay measuring unit 104, a measurement result inserting unit 105, an upstream optical signal transmitting unit 106, a downstream optical signal receiving unit 108, a downstream signal A reception unit 109, a measurement request detection unit 110, and a downstream optical signal transmission unit 111 are provided.
  • the wavelength demultiplexing unit 101 demultiplexes the wavelength multiplexing of the upstream optical signal from the remote device 30, and wavelength-multiplexes the downstream optical signal to the remote device 30.
  • the burst signal receiving unit 102 converts the burst-like upstream optical signal into an electric signal, and performs bit synchronization processing of the converted signal.
  • the upstream signal receiving unit 103 performs byte synchronization processing on the upstream signal converted into the electrical signal.
  • the delay measuring unit 104 measures a transmission delay time between the own device (10) and each of the remote devices 30-1, 30-2,..., 30-n according to a procedure described later using a measurement signal. .
  • the measurement result insertion unit 105 inserts the measurement result 1002 obtained by the delay measurement unit 104 into the uplink signal 1003.
  • the upstream optical signal transmission unit 106 converts the upstream signal 1003 into which the measurement result 1002 is inserted into an optical signal.
  • the wavelength demultiplexing unit 107 wavelength-multiplexes the upstream optical signal to the station apparatus 20.
  • the downstream optical signal receiving unit 108 converts the downstream optical signal from the station device 20 into an electrical signal.
  • the downlink signal receiving unit 109 performs synchronization processing and error detection processing of the downlink signal converted into the electric signal.
  • the measurement request detection unit 110 monitors whether the downstream signal from the station apparatus 20 includes a later-described measurement request signal as a measurement downstream signal. Further, the measurement request detection unit 110 issues a measurement start signal 1001 when a measurement request signal is detected.
  • the downstream optical signal transmission unit 111 converts the downstream signal to the remote device 30 into an optical signal.
  • FIG. 2 shows the configuration of the station device 20.
  • the communication unit 201 has a function of performing wavelength multiplexing or separation of an upstream optical signal and a downstream optical signal transmitted to and received from the relay apparatus 10, a function of converting an optical signal and an electrical signal, and the like.
  • the extraction unit 202 extracts the transmission delay time measurement result 2002 from the uplink signal 2001. This measurement result 2002 is obtained by the delay measurement unit 104 (FIG. 1) of the relay device 10 described above.
  • the control unit 203 generates a measurement request signal 2004 for requesting measurement of the transmission delay time.
  • the measurement request signal 2004 is a measurement downlink signal that is transmitted to the remote device 30 in order to measure the transmission delay time.
  • the control unit 203 generates a delay instruction signal 2005 for each of the remote devices 30-1, 30-2,..., 30-n using the measurement result 2002 supplied from the relay device 10 in response to the measurement request.
  • this delay instruction signal 2005 a delay amount to be applied when the remote device 30 transmits an uplink signal to the station device 20 is described.
  • the insertion unit 204 inserts it into the downstream signal 2003 to the remote device 30.
  • the remote device 30 includes a measurement response unit 31 (31-1 to 31-n) that returns a measurement uplink signal when the measurement request signal (2004) transmitted from the station device 20 is received.
  • the station device 20 In order to determine the delay amount described in the delay instruction signal 2005 (FIG. 2) to the remote device 30, the station device 20 first transmits a measurement request signal 2004 in the downstream direction. When this measurement request signal is detected by the relay device 10, the relay device 10 transfers it to the remote device 30 and issues a measurement start signal 1001 by the measurement request detector 110.
  • the measurement request signal is transferred from the relay device 10 to the remote device 30 via the optical splitter 40. Receiving the measurement request signal, the remote device 30 returns and transmits the measurement uplink signal.
  • the delay measurement unit 104 recognizes the above-described measurement start signal 1001 as a trigger for starting measurement of the transmission delay time.
  • the measurement start signal 1001 is a fixed delay from when the measurement request signal is detected by the measurement request detection unit 110 to when it is actually output from the relay device 10, or an upstream signal that was being received is received before the measurement is started. It is output at a timing that takes into account a delay time for completing the processing.
  • the delay measurement unit 104 starts measurement of the transmission delay time and at the same time starts the above-described measurement window period, that is, a period during which no uplink signal other than for measurement is received from the uplink signal from the remote device 30. Start.
  • the time width of this window is theoretically based on the maximum value (maximum transmission distance) of the transmission distance between the own device (10) and each of the remote devices 30-1, 30-2, ..., 30-n. Apply the transmission delay time. As a result, it is possible to receive measurement uplink signals from all remote devices 30.
  • the delay measuring unit 104 waits for a measurement uplink signal from each of the remote devices 30-1, 30-2, ..., 30-n during the window period. During this time, when a measurement uplink signal from a certain remote device 30 is received, the time from the trigger generation (1001) time to the current reception time is recorded as the transmission delay time of the remote device 30. Note that the uplink signal for measurement from the remote device 30 is terminated at the relay device 10 and is not transferred to the station device 20.
  • the delay measurement unit 104 describes in the measurement result 1002 information on whether or not the transmission delay time could be measured within the window period and the record of the measured transmission delay time. Also, the reception of uplink signals other than for measurement such as user data is resumed at the end of the window period.
  • the measurement result 1002 is inserted into the upstream signal 1003 by the measurement result insertion unit 105 and sent to the station apparatus 20.
  • the station apparatus 20 extracts the measurement result 1002 from the uplink signal from the relay apparatus 10, and uses it to delay instruction signals to the remote apparatuses 30-1, 30-2,..., 30-n (FIG. 2: 2005). ).
  • the created delay instruction signal is inserted into the downstream signal and distributed to the remote device 30.
  • the remote device 30 delays the transmission timing of the uplink signal to the station device 20 by the delay time described therein. This prevents the upstream signals of the remote devices 30-1, 30-2,..., 30-n from colliding with the optical splitter 40.
  • the window in this embodiment is demonstrated.
  • the horizontal axis corresponds to time
  • the vertical axis corresponds to transmission distance.
  • the remote device 30 having the shortest transmission distance from the relay device 10 is referred to as the remote device 30-1, and the remote device 30-n having the longest transmission distance (maximum transmission distance: d max ).
  • the measurement request signal transmitted from the station device 20 at time A arrives at the relay device 10 at time C (> A) and is transferred to the remote device 30.
  • the remote device 30 returns the measurement uplink signal as soon as the measurement request signal is received.
  • the upstream signal for measurement from the remote device 30-1 having the shortest transmission distance among the remote devices 30 first arrives at the relay device 10. Thereafter, at time D, the measurement uplink signal from the remote device 30-n having the maximum transmission distance arrives at the relay device 10.
  • the relay device 10 transfers the measurement uplink signal from the remote device 30 to the station device 20
  • the measurement uplink signal from the remote device 30-n having the maximum transmission distance is the time D described above. Is transferred from the relay apparatus 10 to the station apparatus 20. Then, the transferred measurement uplink signal arrives at the station apparatus 20 at time B (> D).
  • the transmission delay time of the remote device 30-n from the viewpoint of the station device 20 is the time from time A to time B as shown in FIG.
  • the time C to D is the time width is shorter than that of the station device 20 (A to B).
  • the transmission delay time between the device in which the window is set and the remote device 30 having the maximum transmission distance from the device is applied to the window time width. Therefore, the time width of the times C to D may be applied to the window set in the relay device 10 of the present embodiment.
  • the time width of the window is a time A to B longer than that of the relay device 10 (C to D).
  • the transmission distance between the remote device 30-n and the station device 20 is defined. Does not directly affect the window width.
  • FIG. 4 shows the system configuration of another embodiment of the present invention.
  • the bidirectional optical transmission path is a single core, but the transmission path when implementing the present invention is not limited to a single core. It may be a two-core transmission line that uses a separate transmission line for transmission of the upstream signal / downstream signal.
  • the star-type connection between the relay device 10 and the remote device 30 is not limited to a single optical splitter (FIG. 1:40), but an upstream signal splitter 40a and a downstream signal splitter.
  • An optical splitter 40b is used.
  • FIG. 1 Another change from the above-described embodiment (FIG. 1) is that the wavelength demultiplexing units 101 and 107 do not exist.
  • Other configurations and operations are the same as those in the above-described embodiment, and a description thereof will be omitted.
  • the present invention is not limited to the above embodiment.
  • the implementation of the present invention can be modified as appropriate within the scope of the claims of the present application.
  • the present invention may be implemented as a computer program corresponding to the operation of the relay device (10) or the station device (20) or a recording medium storing the program.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Small-Scale Networks (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention porte sur un système de communication optique, qui comporte un dispositif de station, une pluralité de dispositifs distants qui communiquent avec le dispositif de station, échangeant des signaux de liaison montante/descendante soumis à un multiplexage en longueur d'onde par TDMA/TDM, un dispositif relais qui fonctionne en tant que relais entre le dispositif de station et les dispositifs distants, et un coupleur optique qui connecte selon une configuration en étoile le dispositif relais et les dispositifs distants. Le dispositif relais comprend une partie de mesure de retard qui démarre, en réponse à un signal de requête de mesure provenant du dispositif de station, une période de fenêtre pendant laquelle des signaux de liaison montante autres que des signaux de liaison montante de mesure provenant des dispositifs distants respectifs ne sont pas reçus et mesure une période de retard de transmission entre le dispositif relais et les dispositifs distants dans la période de fenêtre, et une partie d'introduction de résultat de mesure qui introduit le résultat de mesure dans des signaux de liaison montante vers le dispositif de station. Le dispositif de station comprend une partie de commande qui génère le signal de requête de mesure, détermine une quantité de retard devant être appliqué à une transmission des signaux de liaison montante par les dispositifs distants à l'aide du résultat de mesure provenant du dispositif relais apparenté au signal de requête de mesure, et génère un signal d'instruction de retard décrivant la quantité de retard et une partie d'introduction qui introduit le signal de requête de mesure et le signal d'instruction de retard dans des signaux de liaison descendante vers les dispositifs distants.
PCT/JP2009/058983 2008-05-26 2009-05-14 Système de communication optique, procédé de communication optique et dispositif relais WO2009145066A1 (fr)

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JP2008-136587 2008-05-26

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010161672A (ja) * 2009-01-09 2010-07-22 Hitachi Ltd 光通信システムならびにその運用方法

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996016490A1 (fr) * 1994-11-22 1996-05-30 British Telecommunications Public Limited Company Reseau optique
JP2001119731A (ja) * 1999-10-18 2001-04-27 Mitsubishi Cable Ind Ltd 光加入者システム

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996016490A1 (fr) * 1994-11-22 1996-05-30 British Telecommunications Public Limited Company Reseau optique
JP2001119731A (ja) * 1999-10-18 2001-04-27 Mitsubishi Cable Ind Ltd 光加入者システム

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010161672A (ja) * 2009-01-09 2010-07-22 Hitachi Ltd 光通信システムならびにその運用方法

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