WO2006085375A1 - Appareil multiplexe de division des longueurs d’ondes - Google Patents

Appareil multiplexe de division des longueurs d’ondes Download PDF

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Publication number
WO2006085375A1
WO2006085375A1 PCT/JP2005/002014 JP2005002014W WO2006085375A1 WO 2006085375 A1 WO2006085375 A1 WO 2006085375A1 JP 2005002014 W JP2005002014 W JP 2005002014W WO 2006085375 A1 WO2006085375 A1 WO 2006085375A1
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WO
WIPO (PCT)
Prior art keywords
node
wavelength
path
multiplexed signal
signal
Prior art date
Application number
PCT/JP2005/002014
Other languages
English (en)
Japanese (ja)
Inventor
Tomoyuki Suzuki
Mitsuaki Haneishi
Hiroaki Nakazato
Takashi Sakata
Original Assignee
Fujitsu Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Limited filed Critical Fujitsu Limited
Priority to PCT/JP2005/002014 priority Critical patent/WO2006085375A1/fr
Publication of WO2006085375A1 publication Critical patent/WO2006085375A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
    • H04J14/0212—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] using optical switches or wavelength selective switches [WSS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor
    • H04J14/0206—Express channels arrangements

Definitions

  • the present invention relates to a wavelength division multiplexing (WDM) apparatus, and in particular, an OADM (Optical Add Drop Module) unit (demultiplexing unit) capable of adding, dropping, and passing a wavelength to a relay station.
  • WDM wavelength division multiplexing
  • OADM Optical Add Drop Module
  • demultiplexing unit capable of adding, dropping, and passing a wavelength to a relay station.
  • OSNR Optical Noise Signal Ratio
  • OSNR (Optical Noise Signal Ratio)
  • FIG. 1 is a diagram illustrating OSNR.
  • OSNR is a value representing the difference between signal light and noise light in dB. The smaller this difference (the smaller the difference between signal light and noise light), the greater the noise in the signal received at the terminal station. It becomes difficult to receive.
  • the OSNR limit value is the maximum OSNR that can be received by the receiving unit of the terminal station.
  • the noise light includes broadband noise called ASE (Amplified Spontaneous Emission) due to optical amplification relay.
  • ASE Anamplified Spontaneous Emission
  • FIG. 2 is a diagram for explaining OSNR in a conventional WDM apparatus having a point-to-point configuration.
  • the WDM equipment is configured to include a starting station node (Node) A, a relay station node B, and a terminating station node C.
  • a plurality of relay station nodes B may be provided on the optical signal transmission path.
  • the starting station node A has a multiplexing unit (Multiplexer) ll that multiplexes and transmits optical signals of a plurality of wavelengths, and a transmission amplifier unit 12 that amplifies the transmitted optical signal.
  • Multiplexer multiplexing unit
  • the station node B has an amplifier section (In
  • the terminal station node C includes a reception amplifier unit 31 that amplifies the received optical signal and a demultiplexer 32 that demultiplexes the multiplexed optical signal.
  • FIG. 2 schematically shows a state in which the spectrum analyzer 40 is connected to the reception amplifier unit 31 of the terminal station node C.
  • the starting station A power measured by the receiving amplifier unit 31 of the terminal station node C is also increased to the terminal station node C.
  • Total OSNR force It is necessary to design the WDM equipment so that it exceeds the OSNR limit value of the receiver that receives the optical signal of each wavelength.
  • Patent Document 1 in the demultiplexer and multiplexer of the WDM optical signal, only the pass wavelength band is made equal, and the free spectral ranges representing the periodicity of the pass characteristics are made different from each other. Thus, the invention for preventing the accumulation of unnecessary ASE noise light is disclosed.
  • Patent Document 1 Japanese Patent Laid-Open No. 2003-69496
  • FIG. 3 is a diagram for explaining the OSNR of a WDM apparatus having an OADM unit.
  • the central station node B includes an OADM unit 22 and amplifier units 21 and 23 on the upstream side and the downstream side, respectively.
  • the OADM unit 22 includes a separation unit 221 that separates the multiplexed optical signal for each wavelength and a multiplexing unit 222 that multiplexes again.
  • the optical signal can pass between the separation unit 221 and the multiplexing unit 222.
  • the demultiplexing unit functions as a multiplexing unit
  • the multiplexing unit functions as a demultiplexing unit. You will be ashamed.
  • the optical signal passing therethrough is separated for each wavelength, so that a noise light component (ASE light) important for measuring the OSNR is cut by the filter.
  • ASE light a noise light component
  • the signal light is a signal having a peak at a specific wavelength
  • the noise light (ASE light) is a signal that spreads in a wavelength band having a certain width.
  • the noise light component is also divided for each specific wavelength together with the signal light component. As a result, the spread of the wavelength band of the noise light component cannot be recognized, and the signal light and the noise light cannot be substantially distinguished.
  • the total OSNR is obtained by summing the OSNR for each span according to the to-end route.
  • measuring OSNR for each span requires a lot of time and labor.
  • measurement errors of the spectrum analyzer that measures OSNR are also superimposed, leading to poor measurement accuracy.
  • an object of the present invention is to measure an OSNR (Optical Noise Signal Ratio) end to end in a WDM apparatus (wavelength division multiplexing apparatus) in which a relay station node has an OADM unit. It is to provide a wavelength division multiplexing apparatus.
  • OSNR Optical Noise Signal Ratio
  • a first wavelength division multiplexing apparatus of the present invention for realizing the above object generates a first wavelength multiplexed signal by multiplexing a plurality of optical signals having different wavelengths, and generates the first wavelength multiplexed signal.
  • the first wavelength-multiplexed signal from the first node and the first wavelength-multiplexed signal received from the first node, the first wavelength-multiplexed signal is divided into optical signals for each wavelength, and further divided
  • a plurality of optical signals having different wavelengths including at least a part of the optical signal are multiplexed to generate a second wavelength multiplexed signal, and the first path for transmitting the second wavelength multiplexed signal is received.
  • a second node having a second path for transmitting the first wavelength multiplexed signal without being divided and multiplexed; and the first wavelength multiplexed signal from the second node or the second And a receiving node for receiving the wavelength division multiplexed signal.
  • a second wavelength division multiplexing apparatus is the first wavelength division multiplexing apparatus, wherein the second node transmits the first wavelength division multiplexed signal for each wavelength on the first path. And a multiplexing unit that multiplexes a plurality of optical signals having different wavelengths including at least a part of the divided optical signal to generate a second wavelength multiplexed signal.
  • the second path is branched from the first path on the upstream side of the separation unit and merges with the first path on the downstream side of the multiplexing unit.
  • a third wavelength division multiplexing apparatus is the first wavelength division multiplexing apparatus, wherein the second node is a path of the first wavelength division multiplexed signal in the OSNR measurement mode.
  • the first path is selected in the normal operation mode.
  • a fourth wavelength division multiplexing apparatus is the third wavelength division multiplexing apparatus, wherein the second node includes a plurality of switches for switching the first path or the second path. It is characterized by providing.
  • a fifth wavelength division multiplexing apparatus of the present invention includes a first node that selects and transmits either a first wavelength multiplexed signal or a dummy optical signal obtained by multiplexing a plurality of optical signals having different wavelengths.
  • the first wavelength multiplexed signal is divided into optical signals for each wavelength, and a plurality of optical signals having different wavelengths including at least a part of the divided optical signals are further multiplexed to generate a second wavelength multiplexed signal.
  • the second path for transmitting the second wavelength multiplexed signal and the second node for transmitting the dummy optical signal without being divided and multiplexed can be selected.
  • a receiving node that receives the second wavelength multiplexed signal or dummy optical signal from the second node.
  • the first node selects and transmits the dummy optical signal in an OSNR measurement mode.
  • the operation mode the first wavelength division multiplexed signal is selected and transmitted, and the second node selects the second path in the OSNR measurement mode, and in the normal operation mode, the first node is selected. The path is selected.
  • the first node selects either the first wavelength division multiplexed signal or the dummy optical signal.
  • the second node has a plurality of second switches for switching the first path or the second path.
  • An eighth wavelength division multiplexing apparatus of the present invention is the seventh wavelength division multiplexing apparatus, further comprising a control device for remotely operating the first switch and the second switch. It is characterized by.
  • the wavelength division multiplexing apparatus of the present invention by providing a bypass (second node) that relays the wavelength multiplexed signal without separating and multiplexing the wavelength multiplexed signal, the node that relays the wavelength multiplexed signal is provided. Therefore, it is possible to prevent the noise light component from disappearing by 4 points and to measure the OSNR at the end-to-end with a single OSNR measurement at the terminal station (third node) at one power point. In addition, the number of work steps can be greatly reduced.
  • FIG. 1 is a diagram for explaining OSNR.
  • FIG. 2 is a diagram for explaining OSNR in a conventional WDM apparatus having a point-to-point configuration.
  • FIG. 3 is a diagram for explaining the OSNR of a WDM apparatus having an OADM unit.
  • FIG. 4 is a diagram showing a first configuration of a WDM apparatus in an embodiment of the present invention.
  • FIG. 5 is a diagram showing another configuration example of the starting point station node A.
  • FIG. 6 is a diagram showing a configuration example of an end station node C.
  • FIG. 7 is a diagram showing a second configuration of the WDM apparatus in the embodiment of the present invention.
  • FIG. 8 is a diagram showing a system configuration for remotely controlling each switch of a node.
  • FIG. 9 is a diagram showing an example of a switch setting table held by the control terminal 80.
  • FIG. 10 is a diagram showing a flowchart for controlling the switch operation of each node. Explanation of symbols
  • A, B, C nodes
  • FIG. 4 is a diagram showing a first configuration of the WDM apparatus in the embodiment of the present invention.
  • the upstream side of the separation unit 221 of the relay station node B more specifically, between the (reception) amplifier unit 23 and the separation unit 221
  • a switch SW3 for switching the signal path is provided, and further, a switch SW1 for switching the optical signal path is provided downstream of the multiplexing unit 222, more specifically, between the multiplexing unit 222 and the (transmission) amplifier unit 24.
  • a normal path through which the optical signal passes through the OADM unit 22 and a bypass 25 through which the optical signal does not pass through the OADM unit 22 are provided between the switch SW1 and the switch SW3.
  • Switches SW1 and SW3 switch the optical signal path between the normal operation mode and the OSNR measurement mode. That is, in the normal operation mode, the switch SW3 selects a normal path for introducing the optical signal of the receiving amplifier unit 23 to the OADM unit 22, and the switch SW1 is also connected to the OA. Selects the normal nose to which the optical signal from DM section 22 is input. On the other hand, in the OSNR measurement mode, in order to prevent the optical signal from passing through the OADM unit 22, the switch SW3 selects the bypass 25 and branches the optical signal from the reception amplifier unit 23 to the bypass 25. The switch SW1 is also switched to input the optical signal from Neupath 25.
  • the optical signal does not pass through the OADM unit 22!
  • the optical signal is transmitted to the OADM unit 22.
  • the above-mentioned problem that noise light does not seem to be visible by passing through can be solved. Therefore, even if the relay station node B includes the OADM unit 22, by transmitting the no-path route, the noise light component is superposed every time the amplifier unit passes, and is received by the receiving amplifier 31 of the terminal station node C.
  • the total OSNR from the start station node A to the end station node C can be measured.
  • FIG. 5 is a diagram showing another configuration example of the starting point station node A.
  • the node that is the starting point of the OSNR measurement interval does not necessarily have a light source. Therefore, a dummy light source 50 is provided at the starting station node A, and a switch SW1 for inputting and transmitting light from the dummy light source 50 in the OSNR measurement mode is provided.
  • the dummy light source 50 generates light having the same wavelength band as that of the optical signal used in the normal operation mode.
  • switch SW1 the switch inserted between the multiplexing unit and the transmission amplifier unit in the start station node A and the terminal station node C, not limited to the relay station node B, is referred to as a switch SW1, and the reception amplifier unit and the separation unit are connected to each other.
  • the switch inserted between them is called switch SW3.
  • FIG. 6 is a diagram showing a configuration example of the end station node C.
  • the receiving amplifier unit 31 outputs the optical power bra 311 that branches the received optical signal and the output for extracting the optical signal that also splits the optical signal to the outside.
  • the terminal 312 is provided, and the OSNR check measuring instrument (spectrum analyzer) 40 is connected to the output terminal 312 to measure the OSNR from the starting station node A.
  • FIG. 7 is a diagram showing a second configuration of the WDM apparatus in the embodiment of the present invention.
  • the WDM equipment constitutes a ring system.
  • each node can be a starting station node, and each node can be a terminal station node. it can. Therefore, as shown in the figure, a dummy light source 50 is provided at each node, and switches S Wl, SW 2, and SW 3 are arranged.
  • the switch SW2 is a switch that selects either the bypassed wavelength multiplexed signal power or the optical signal from the dummy light source 50, and its output is input to the switch SW1.
  • the switch SW1 operates to select either the optical signal from the switch SW2 (from the bypass) or the optical signal from the OADM unit 22 (with normal path power).
  • Figure 7 (a) shows the case where OSNR is measured for the optical signal route between node A and node.
  • switches SW1 and SW2 are operated so that the optical signal from the dummy light source 50 is input to the transmission amplifier unit 21.
  • switches SW1 and SW3 are operated so as to bypass the OADM unit 22. Note that the switch SW3 of node B may use a 1: 1 optical power bra instead of a switch device and simply split the optical signal in two directions.
  • node C receives the optical signal from the dummy light source 50 of node A without the noise light component being cut by the OADM unit 22 of node B. Can. Therefore, by connecting the spectrum analyzer 40 to the output terminal 312 of the receiving amplifier 31 of the node C, it is possible to measure the OSNR between the node A and the node C with high accuracy in one measurement at one power point. become able to.
  • Fig. 7 (b) shows the operating position of each switch in the normal operation mode.
  • the switch SW1 of node A and node B and the switch SW3 of node B and node C are operated so that the optical signal of the light source power passes through the demultiplexing unit.
  • Switch SW 2 may be in either position.
  • FIG. 8 is a diagram showing a system configuration for remotely controlling each switch of the node.
  • the CPU 70 (70A, 70B, 70C) of each node A, B, C is connected to the remote control terminal 80.
  • the CPUs 70B and 70C of the node B and the node C are connected to the CPU 70A of the node A via the photoelectric conversion unit 90 of each node, and the CPU 70A of the node A is connected to the control terminal 80 and the LAN line.
  • Each node also includes a switch selection state memory 92 for storing the switching position of each switch.
  • the CPU 70 switches each switch SW1, SW2, S Give instructions to W3 and operate each switch.
  • the CPU 70 and the remote control terminal 80 can be connected by means such as an in-band monitoring line between the CPUs, a modem, and a serial interface in addition to the LAN interface.
  • FIG. 10 is a diagram showing a flowchart for controlling the switch operation of each node based on the table of FIG.
  • various parameters related to OSNR measurement are input to the control terminal 80 (S10). Specifically, as described above, the OSNR measurement mode or normal operation mode parameters and the parameters related to the type of each node (whether it is a start station node or relay station node or end station node) are input.
  • control terminal 80 determines that it is not in the OSNR measurement mode (in the normal operation mode) based on the input parameters (S11), the switch of each node related to the node type is determined.
  • the switch position instructs each node of the setting value in the setting table 4 in FIG.
  • step S11 for the node set as the starting station node (YES in S12), the setting value in setting table 1 in Fig. 9 is instructed.
  • the setting value in setting table 2 in Fig. 9 is instructed.
  • the setting value in setting table 3 in FIG. 9 is instructed.
  • Each node for which the set value is instructed operates switches SW1, SW2, and SW3 according to the set value (S18). Then, the selection position by the operation is overwritten and saved in the switch selection state memory 92 (S19).
  • the present invention is applied to high-accuracy measurement of end-to-end total OSNR, which is indispensable for designing WDM equipment, by providing a bypass that does not pass the OADM part that separates and multiplexes wavelength-multiplexed signals at the relay node. be able to.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention concerne un appareil multiplexe de division des longueurs d’ondes composé d’un nœud de station de transmission, d’un nœud de station relais et d’un nœud de station finale. Dans cet appareil, un contournement permettant de transmettre un signal multiplexé de longueur d’ondes sans séparation ni multiplexage est fourni au nœud de la station de relais constitué d’une unité OADM (unité de démultiplexage). De la sorte, il est possible d’empêcher l’élimination apparente des composants de la lumière de bruit et d’obtenir une seule mesure précise du RSB total de bout en bout dans le nœud de station finale. De plus, le nombre de traitements d’opérations peut être réduit de façon significative.
PCT/JP2005/002014 2005-02-10 2005-02-10 Appareil multiplexe de division des longueurs d’ondes WO2006085375A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2005/002014 WO2006085375A1 (fr) 2005-02-10 2005-02-10 Appareil multiplexe de division des longueurs d’ondes

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Application Number Priority Date Filing Date Title
PCT/JP2005/002014 WO2006085375A1 (fr) 2005-02-10 2005-02-10 Appareil multiplexe de division des longueurs d’ondes

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05296831A (ja) * 1992-04-21 1993-11-12 Fujitsu Ltd Ｓｎｒ測定装置
JPH0964819A (ja) * 1995-08-23 1997-03-07 Fujitsu Ltd 光システム
JP2002209236A (ja) * 2001-01-12 2002-07-26 Fujitsu Ltd 光ノード装置及び該装置を備えたシステム
JP2003086869A (ja) * 2001-09-14 2003-03-20 Fujitsu Ltd 光アンプの雑音指数測定装置
JP2004158652A (ja) * 2002-11-06 2004-06-03 Fujitsu Ltd 光増幅器，光増幅器における通過波長特性制御方法および光伝送システム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05296831A (ja) * 1992-04-21 1993-11-12 Fujitsu Ltd Ｓｎｒ測定装置
JPH0964819A (ja) * 1995-08-23 1997-03-07 Fujitsu Ltd 光システム
JP2002209236A (ja) * 2001-01-12 2002-07-26 Fujitsu Ltd 光ノード装置及び該装置を備えたシステム
JP2003086869A (ja) * 2001-09-14 2003-03-20 Fujitsu Ltd 光アンプの雑音指数測定装置
JP2004158652A (ja) * 2002-11-06 2004-06-03 Fujitsu Ltd 光増幅器，光増幅器における通過波長特性制御方法および光伝送システム

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