WO2000013374A1 - Emetteur a multiplexage par division de longueur d'onde - Google Patents

Emetteur a multiplexage par division de longueur d'onde Download PDF

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Publication number
WO2000013374A1
WO2000013374A1 PCT/JP1999/004638 JP9904638W WO0013374A1 WO 2000013374 A1 WO2000013374 A1 WO 2000013374A1 JP 9904638 W JP9904638 W JP 9904638W WO 0013374 A1 WO0013374 A1 WO 0013374A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
optical
multiplex transmission
connector
wavelength division
Prior art date
Application number
PCT/JP1999/004638
Other languages
English (en)
Japanese (ja)
Inventor
Hiroshi Numamoto
Original Assignee
Nippon Steel Corporation
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
Priority claimed from JP11127717A external-priority patent/JP2000324050A/ja
Application filed by Nippon Steel Corporation filed Critical Nippon Steel Corporation
Publication of WO2000013374A1 publication Critical patent/WO2000013374A1/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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
    • H04J14/0246—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0249—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
    • H04J14/025—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU using one wavelength per ONU, e.g. for transmissions from-ONU-to-OLT or from-ONU-to-ONU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0226—Fixed carrier allocation, e.g. according to service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0282—WDM tree architectures

Definitions

  • Wavelength division multiplex transmission equipment Wavelength division multiplex transmission equipment
  • the present invention relates to a wavelength division multiplex transmission device, and is particularly suitable for use in a wavelength division multiplex transmission device having a function of converting a signal from electricity to light or from light to electricity.
  • WDM wavelength division multiplexing
  • media converters for converting an electric signal to an optical signal or for converting an optical signal to an electric signal and a WDM (Wavelength Division Multiplex) transmission device having the function have been studied.
  • a so-called cage-type WDM transmission device has recently been announced.
  • This cage-type WDM transmission device is a type in which multiple general-purpose modules are slotted and combined into one cage.
  • the general-purpose module can support various media such as ATM (Asynchronic Transfer Mode), FDDI (Fiber Distributed Data Interface), and Ethernet.
  • Each general-purpose module performs processing corresponding to the physical layer and data link layer of the protocol.
  • optical multiplex transmission lines eg, optical fibers
  • optical multiplex transmission lines consist of physically independent transmission lines and reception lines for bidirectional communication. In each case, multiplex transmission was performed.
  • the conventional WDM transmission device has a problem that when a communication network is constructed by connecting a plurality of devices via the WDM transmission device, the work required for the construction is very complicated.
  • a communication network is often constructed by connecting WDM transmission devices located at remote locations with optical fibers of a multiplex transmission line and connecting a plurality of devices to a local interface of each WDM transmission device.
  • it is necessary to check whether the optical fiber is properly connected between the WDM transmission equipment and what kind of electrical signal is used as the other party's electrical signal to make the necessary settings. is there.
  • this has to be performed by a worker in a remote place while confirming the information one by one using wireless communication or a telephone, etc., which requires a very troublesome work.
  • the above cage type WDM transmission equipment using general-purpose modules has the advantage that it can support various media such as ATM, FDDI, and Ethernet.
  • each module is a general-purpose module that processes the so-called physical layer and data link layer of the media protocol, compensation for the operation of the application layer above the communication protocol is not made. It has not been.
  • the present invention has been made to solve such a problem, and the presence or absence of an electric signal or an optical signal supplied to a WDM transmission device, or any type of electric signal is used.
  • the purpose is to provide a practical WDM transmission device for operators, etc.
  • a wavelength division multiplexing transmission device detects a state of a local interface connector, an optical signal connector connected to a multiplex transmission line, and the presence or absence of a signal supplied to the optical signal connector. It is characterized by having a first display unit and a second display unit that detects the type of signal supplied to the mouth-to-mouth interface connector and indicates the type.
  • the wavelength division multiplex transmission device further includes a third display unit that detects the presence or absence of a signal supplied to the local interface connector and indicates the state. .
  • the wavelength division multiplexing transmission device further comprises a setting unit for automatically detecting or manually setting the frequency of the electric signal supplied to the communication interface connector. I do.
  • the wavelength division multiplex transmission apparatus has a unit for switching a signal wiring connection from the single-car interface connector according to a device connected to the low-power interface connector. It is characterized by that.
  • the wavelength division multiplexing transmission apparatus includes a local module having an oral interface corresponding to each medium, and a remote module connected to a multiplex transmission line. It is connected to the oral module, and the oral module has a clock compensating unit that performs clock compensation of a signal received from the multiplex transmission line.
  • the remote module provided in the existing wavelength division multiplex transmission apparatus is connected to the remote module provided in the wavelength division multiplex transmission apparatus to be added. It is characterized by having an optical power puller that distributes signals received through the multiplex transmission line and outputs the combined signals sent from each wavelength division multiplex transmission device.
  • the present invention configured as described above, it can be seen at a glance whether or not a signal is flowing through the multiplex transmission line by looking at the first display unit, and it can be seen at a glance by looking at the second display unit. You can see at a glance whether there is a signal flowing through the connector and the type of signal. In addition, the presence or absence of a signal flowing through the local interface connector can be more easily recognized by looking at the third display, so that when the communication network is constructed, the signal is flowing properly, or You can easily see if the correct signal is flowing according to the connection partner such as a computer terminal.
  • the signal wiring connection from the local interface connector can be switched according to the device connected to the local interface connector.
  • the wiring connection for the signal can be easily changed according to whether the terminal to be connected to the terminal is a terminal or a hub, etc., and reliable construction can be realized.
  • the local module by providing the local module with a clock compensating means for performing clock compensation of the received signal from the multiplex transmission line, the local module is provided with a phase compensator in the phase direction due to the transmission path transmission of the received signal. Correct the deviation, The occurrence of a communication failure state can be suppressed.
  • a remote module of a wavelength division multiplex transmission device already used is connected to a remote module of a wavelength division multiplex transmission device to be added by using an optical power bra.
  • a wavelength division multiplex transmission device having a different frequency is easily added by using an already laid optical fiber.
  • FIG. 1 is a schematic view of a WDM transmission device according to a first embodiment of the present invention, where (A) is a front view, (B) is a rear view, and (C) is a perspective view.
  • FIG. 2 is a block diagram showing an example of a circuit configuration inside the WDM transmission device shown in FIG.
  • FIG. 3 is a block diagram showing one configuration example of the cross-straight switching circuit shown in FIG.
  • FIG. 4 is a schematic view of a WDM transmission device according to another embodiment of the present invention, where (A) is a front view and (B) is a rear view.
  • FIG. 5 illustrates the second embodiment, and is a diagram illustrating an example of the configuration of an entire system that performs communication using a WDM transmission device.
  • FIG. 6 is a block diagram showing the second embodiment, and showing a configuration example in the WDM transmission device shown in FIG.
  • FIG. 7 is a block diagram showing the third embodiment and showing another configuration example in the WDM transmission apparatus shown in FIG.
  • FIG. 8 illustrates the fourth embodiment, and is a diagram illustrating another configuration example of an entire system that performs communication using a WDM transmission device.
  • FIG. 9 is a diagram showing a connection example of the remote modules in the system configuration shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a schematic view of a wavelength division multiplexing (WDM) transmission device according to an embodiment of the present invention.
  • 1A is a front view of the WDM transmission device
  • FIG. 1B is a rear view
  • FIG. 1C is a perspective view.
  • This WDM transmission device has two electrical signal inputs and outputs for the local interface and one optical signal input and output for the multiplex transmission line.
  • full-duplex communication four optical wavelengths and four electrical signals are used, and in the case of half-duplex communication, two are used.
  • reference numeral 1 denotes a light emitting diode (LED) indicating a power supply state, which is lit when electric energy is supplied to a power outlet 2 on a rear surface.
  • Reference numeral 3 denotes a light emitting diode (LED) indicating the state of optical communication, which is lit when an optical fiber line (multiplex transmission line) is connected to the optical signal connector 4 on the rear surface and optical communication is being performed.
  • This LED 3 constitutes a first display unit of the present invention.
  • Reference numerals 5 and 6 denote light emitting diodes (LEDs) indicating the state of electric signals.
  • the first and second communication lines of the mouth-calendar interface are connected to connectors 7 and 8 for the local interface. Lights when a signal is flowing.
  • the LEDs 5 and 6 constitute a third display unit of the present invention.
  • Reference numeral 9 denotes a light emitting diode (LED) indicating the type of frequency of the electric signal flowing through the local interface.
  • the frequency of the electric signal flowing through the first and second communication lines of the local interface is set at 10 and 10, respectively. Either lighting indicates whether it is Mb ps or 100 Mb ps.
  • This LED 9 constitutes the second display unit of the present invention.
  • D1 to D3 and D1 'to D3 are dip switches that are used to make various settings described below for each of the first and second communication lines of the local interface. It is.
  • the first communication line system is set by dip switches D1 to D3
  • the second communication line system is set by dip switches Dl 'to D3'.
  • the dip switches D 1 and D 1 ′ are used to set whether to automatically detect the frequency of the electric signal flowing through the local interface or to set the frequency manually.
  • the WDM transmission device shown in Fig. 1 is electrically connected to a hub / computer terminal and the like by connectors 7 and 8 for local interface. Further, the two WDM transmission devices are connected by optical fiber lines connected to the optical signal connector 4 of the multiplex transmission line. Thereby, communication can be performed between the computer terminals connected to the respective WDM transmission devices.
  • Fig. 2 is a block diagram showing the internal circuit configuration of the WDM transmission device shown in Fig. 1.
  • FIG. 1 is a block diagram showing the internal circuit configuration of the WDM transmission device shown in Fig. 1.
  • reference numeral 21 denotes a power supply, which is connected to the LED 1 which indicates a supply state of an external power supply.
  • 2 2 is a carrier detection circuit that detects the presence or absence of an optical signal supplied from the optical signal connector 4, and 2 3 and 2 4 are cross-straight connectors that change the signal connection method by operating the dip switches D 3 and D 3 ′ It is a switching circuit.
  • 25 and 26 are frequency detection circuits that detect the frequency of electric signals
  • 27 and 28 are power supplies
  • 29 and 30 are electro-optical converters (EO) that convert electric signals to optical signals
  • 31 and 3
  • Reference numeral 2 denotes an OR circuit that takes a logical sum of two input electric signals.
  • Reference numeral 33 denotes an optical demultiplexing / multiplexing device that demultiplexes an optical multiplexed signal having a plurality of wavelengths and generates an optical multiplexed signal by multiplexing optical signals of a plurality of wavelengths.
  • the WDM transmission apparatus also includes an photoelectric converter (OZE) that converts an optical signal into an electric signal, and is connected to the above-described demultiplexing / combining device 33. Is done.
  • the optical signal demultiplexed by the demultiplexer / demultiplexer 33 is converted into an electric signal by a photoelectric converter ( ⁇ ⁇ ZE), and supplied to various circuits in the WDM transmission device.
  • OZE photoelectric converter
  • SW 1 is a two-stage switch in which each is connected to the above-mentioned cross-straight switching circuit 23 and power supply 27, and is operated automatically (A) or manually (M) by operating the dip switch D 1. ).
  • SW 1 ′ is a two-stage switch, each of which is connected to the cross / straight switching circuit 24 and the power supply 28, and is operated automatically (A) or manually (D) by operating the dip switch D 1 ′. M) in conjunction with each other.
  • SW2 is located on the manual side (M) of the two-stage switch SW1. These switches are connected in a two-stage configuration and can be switched to the 100 Mb ps side or the 100 Mb ps side by operating the dip switch D2.
  • SW2 ' is a two-stage switch that is connected to the manual side (M) of the two-stage switch SW1', respectively, and is operated at 10 Mbps or 1 Mbps by operating the dip switch D2 '. 0 Switches to 0 Mbps in conjunction with each other.
  • FIG. 3 is a diagram showing a configuration example of the cross-street switching circuit 23.
  • the configuration of the cross / straight switching circuit 24 is the same as that described above, and a description thereof will not be repeated.
  • SW 3 is a two-stage switch that can be switched in cooperation with each other by operating a dip switch D 3.
  • the electrical signal between the connector 7 for the oral interface and the cross-straight switching circuit 23 is represented by one line. Because they are handled, they are shown in two lines in Figure 3. That is, each line in FIG. 2 is actually two lines.
  • connection method between lines A and B and lines C and D shown in Fig. 3 is changed by switching the switch SW3 in accordance with the operation of the dip switch D3. That is, it is determined whether the line A and the line B are connected to the line C and the line D or the line D and the line C, respectively, according to the operation of the dip switch D3.
  • a voltage for supplying power to various circuits in the WDM transmission device is generated from the power.
  • the power supply 21 in FIG. 2 uses a part of the generated voltage to turn on the LED 1 indicating the power supply state.
  • the optical signal from the optical fiber connected to the optical signal connector 4 of the multiplex transmission line is supplied to the carrier detection circuit 22.
  • the carrier detection circuit 22 detects the presence or absence of an optical signal, and when the optical signal is detected, turns on the LED 3 connected to the carrier detection circuit 22.
  • the switches SW 1 and SW 1 provided in the preceding stage of the frequency detection circuits 25 and 26 are provided.
  • SW 1 ' is connected to the automatic side (A) as shown in Fig. 2.
  • the electric signals output from the cross / straight switching circuits 23 and 24 are input to the frequency detection circuits 25 and 26, and a voltage is supplied from the power supplies 27 and 28.
  • the frequency detection circuits 25 and 26 automatically detect the frequency of the electric signal supplied from the cross / straight switching circuits 23 and 24, and output a signal corresponding to the detected frequency.
  • the output signal is supplied to the LED 9, which indicates the frequency of the electric signal flowing through the local interface, and to the ports for the respective frequencies of the electro-optical converters (EZO) 29, 30.
  • the output to the ED 9 is the first communication line of the oral interface and the second communication line.
  • the LED 9 indicating 100 Mbps is turned on for each system, and the LED 9 indicating 100 Mbps is turned on if the signal is 100 Mbps.
  • the switches SW 1 and SW 1 ′ provided in front of the frequency detection circuits 25 and 26 are connected to the manual side (M).
  • the electric signals output from the cross / straight switching circuits 23 and 24 are not supplied to the frequency detection circuits 25 and 26, but are transmitted to the electro-optical converter (EZO) via the switches SW2 and SW2 '. 29, 30 are input.
  • the voltages from the power supplies 27 and 28 are supplied to the LED 9 indicating the frequency of the electric signal flowing through the oral interface via the switches SW2 and SW2 '.
  • the switches SW2 and SW2 ' have a two-stage configuration as described above. One of them is connected to the LED 9 for frequency display, and the other is connected to the electro-optical converters (EZ ⁇ ) 29 and 30. Have been. These switches SW2, SW2, are manually switched to the 100 Mbps or 100 Mbps depending on the settings of the dip switches D2, D2 ', and are switched from the cross / straight switching circuits 23, 24. The output electric signal is supplied to the port for the set frequency of the electro-optical converter (EZO) 29, 30 and the LED 9 corresponding to the set frequency is turned on.
  • EZO electro-optical converter
  • the OR circuits 31 and 32 take the logical OR of the signal indicating 100 Mb ps and the signal indicating 100 Mb ps output to the LED 9 for each of the first and second communication lines. It outputs to LEDs 5 and 6, which indicate that an electric signal is flowing through the communication line of the local interface. As a result, the LEDs 5 and 6 are turned on when an electric signal of either 100 Mbps or 100 Mbps is flowing through the first and second communication lines.
  • the electrical signal input to the electro-optical converter (EZ ⁇ ) 29, 30 is converted into an optical signal here, and then supplied to a demultiplexing / multiplexing circuit 33, where the optical multiplexed signal having a plurality of wavelengths is transmitted. Is generated.
  • the configuration of the demultiplexing / combining circuit 33 is a known one. Then, the optical multiplex signal generated in this way is The signal is output from the optical signal connector 4 to the multiplex transmission line, such as an optical fiber, via the signal detection circuit 22. In this way, the electrical and optical media signals are converted into multiplexed signals.
  • both ends of the optical fiber line are connected to the pair of WDM transmission lines.
  • the module connector of the electric signal line is connected to the connectors 7 and 8 for the mouthpiece interface, and the dip switches D1 to D3 and D1 'to D3' are set to desired states.
  • the frequency of the electrical signal flowing through each oral interface can be recognized at a glance.
  • the connection partner such as a computer terminal.
  • the setting of the dip switches Dl, D2, D1 ', and D2' allows the user to specify whether to automatically detect the frequency of the electric signal or to set the frequency manually. Easy confirmation of frequency selection The construction can be confirmed while performing. Furthermore, by setting the dip switches D 3 and D 3 ′, the line connection method can be changed depending on whether the connection destination of the local interface is a terminal or a hub, so that reliable construction can be realized.
  • the connectors 7 and 8 for the local interface are electrical signal connectors, but may be optical signal connectors.
  • an optical signal connector is used as the connector for the oral interface
  • a photoelectric converter that converts an optical signal into an electric signal is used instead of the cross-straight switching circuits 23 and 24 in the circuit configuration shown in Fig. 2.
  • OZE optical signal connector
  • EZO electro-optical converter
  • the signals of 1 OMbps and 10 OMbps are used as the frequency of the electric signal flowing through the communication line of the local interface.
  • the frequency is not necessarily required.
  • Figure 4 is a diagram showing the general configuration of a WDM transmission device with four electrical signal lines as a local interface and two optical signal lines as a multiplex transmission line.
  • (B) is a rear view thereof.
  • the number of LEDs to be displayed increases as the number of lines increases.
  • the power supply since the power supply is duplicated, it is possible to indicate whether one of the power supply lines is cut off in the power LED (PW1, 2) on the front.
  • FIG. 5 shows a system that performs communication using the WDM transmission device of this embodiment.
  • FIG. 3 is a diagram illustrating an example of the entire configuration.
  • 101 and 102 are WDM transmission apparatuses of the present embodiment, and L100 and L200 are multiplex transmission lines connecting the above two WDM transmission apparatuses 101 and 102. is there.
  • Each of these multiplex transmission lines L100 and L200 is composed of two optical fibers as described later, and transmission and reception are performed in each optical fiber.
  • Optical multiplex transmission is performed between the WDM transmission apparatuses 101 and 102 via this optical fiber.
  • the optical fiber line may constitute a network such as a LAN (Local Area Network) or a WAN (Wide Area Network).
  • a network such as a LAN (Local Area Network) or a WAN (Wide Area Network).
  • an optical signal from one WDM transmission device is transmitted to a plurality of WDM transmission devices via a network, but is received only by the corresponding device.
  • the WDM transmission device 101 here comprises two remote modules R M1, RM 2, one management module MM 1, and four mouthpiece modules LM 1 to LM 4.
  • the first and second remote modules RM 1 and RM 2 are connected to the first to fourth four local modules LM 1 to LM 4.
  • the WDM transmission device 102 also includes two remote modules RM 11 and RM 12, one management module MM 11, and four ports—cal module LM 11 to LM 14. Consisting of The first and second remote modules RM11 and RM12 are connected to first to fourth four-port modules LM11 to LM14.
  • the WDM transmission device may be a cage type in which a plurality of general-purpose modules are slotted and combined into a single cage, or other types. May be.
  • the first remote module RM1 in the WDM transmission device 101 is composed of the corresponding first remote module RM11 in the WDM transmission device 102 of the communication partner and two optical fibers. They are connected by a multiplex transmission line L100, and both transmission and reception are performed in each optical fiber.
  • the second remote module RM 2 is also connected to the corresponding second remote module RM 12 of the communication partner by a multiplex transmission line L 200 composed of two optical fibers, and transmitted by each optical fiber. And reception are performed.
  • Each of the oral modules LM1 to LM4 is designed exclusively for each medium, and a dedicated oral interface circuit and the like are incorporated for each media.
  • As the media there are signaling systems such as FDDI, ATM, Ethernet, SONET (SONET-SDH), fiber channel, and ESCON.
  • These module modules LM1 to LM4 are connected to devices such as personal computers, hubs and routers by signal lines L1 to L4, respectively.
  • the first and second local modules LM 1 and LM 2 are connected to the router by signal lines L 1 and L 2, respectively.
  • the third local module LM3 is connected to the hub by a signal line L3
  • the fourth local module LM4 is connected to the bus computer PC by a signal line L4.
  • the first and second module modules LM11 and LM12 are connected to the signal lines L11 and L12, respectively, via signal lines L11 and L12. Have been.
  • the third local module LM13 is connected to a hub by a signal line L13
  • the fourth oral module LM14 is connected to a personal computer PC by a signal line L14.
  • the management modules MM 1 and MM 11 monitor the cooling fans and power supplies in the WDM transmission devices 101 and 102, respectively.
  • the management modules MM 1 and MM 11 are normally connected to the remote modules RM 1, RM 2, RM 11, RM 12 and the oral modules LM 1 to LM 4, LM 11 to LM 14. You may make it have the diagnostic function of whether it is operating.
  • Each of the local modules LM1 to LM4 receives an electric signal from a corresponding media connected thereto and sends it to the first remote module RM1.
  • the first remote module RM1 converts the electric signals received from the local modules LM1 to LM4 into optical signals and then combines them, and transmits the optical signals via the multiplex transmission line L100. I do.
  • the first remote module RM1 multiplexes the signals received from each of the oral modules LM1 to LM4 and transmits them as optical signals.
  • the remote module RM1 When receiving an optical multiplexed signal via the multiplex transmission line L100, the remote module RM1 performs a predetermined demultiplexing, converts the demultiplexed optical signal into an electric signal, and responds. Supply to local modules LM1 to LM4. Then, each of the oral modules LM1 to LM4 transmits the received electric signal to each media.
  • the second remote module RM2 of the WDM transmission device 101 is a backup module for the backup of the first remote module RM1. That is, when the management module MM1 detects a failure or the like of the first remote module RM1 by a signal line (not shown), the second remote module RM2 functions in place of the first remote module RM1. .
  • the second remote module RM12 in the WDM transmission device 102 also has a backup module for backup of the first remote module RM11. —Le That is, when the management module MM11 detects a failure or the like of the first remote module RM11 by a signal line (not shown), the second remote module RM12 replaces the first remote module RM11. Will work.
  • FIG. 6 is a block diagram showing a configuration example in the WDM transmission device 101. Note that the configuration of the WDM transmission device 102 is the same as this, and a description thereof will be omitted here.
  • 103 and 104 are optical fibers, respectively.
  • the two optical fibers 103 and 104 constitute the multiplex transmission line L100 in FIG.
  • the respective optical fibers 103 and 104 transmit transmission and reception signals.
  • Reference numerals 105 and 106 denote optical demultiplexers / multiplexers, which demultiplex an optical multiplexed signal composed of a plurality of wavelengths and multiplex optical signals of a plurality of wavelengths.
  • Reference numerals 107 to 114 denote photoelectric converters (O / E) that convert optical signals into electrical signals or electro-optical converters (EZO) that convert electrical signals into optical signals.
  • Reference numerals 115 to 118 denote retiming circuits that adjust the timing of a received signal in accordance with an external clock or an internal clock. That is, the retiming circuits 115 to 118 are clock compensating circuits, and detect clock components from the received signal transmitted on the transmission path of the multiplex transmission line L100, and By checking against a known clip by a media-specific coding method, the shift (delay) in the clock phase direction due to data transmission over the transmission path is corrected.
  • Reference numerals 119 to 126 denote dedicated mouthpiece interfaces, which are transmission or reception interface circuits designed to match the frequency of the electric signal with the media. These interface circuits 119 to 126 are connected to a router, a hub, or a personal computer via signal lines L1 to L4, respectively.
  • Reference numerals 127 to 142 denote high frequency connectors, which are connected between the remote module RM1 of the WDM transmission device 101 and the local modules LM1 to LM4, and the oral modules LM1 to LM4 and each media device. It is for transmitting signals between and.
  • the remote module RM1 includes the demultiplexers / combiners 105 and 106, and the photoelectric converter (OZE) and the electro-optical converter (EZO) 107 to 114.
  • the local module LM 1 includes a retiming circuit 115 and dedicated interfaces 119 and 120.
  • the local module LM 2 has a re-timing circuit 1 16 and dedicated interfaces 1 2 1 and 1 2 2
  • a local module LM 3 has a re-timing circuit 1 17 and a dedicated interface 1 2 3 and 1 24
  • the oral module LM 4 is configured to include a retiming circuit 118 and dedicated ink terminals 125 and 126.
  • the electric signal sent from each media connected to the signal lines L1 to L4 is transmitted to each local module LM :! ⁇ LM4 dedicated input and output circuits 120, 122, 124, 126 are received.
  • the received electrical signal is processed as an internal signal.
  • a process such as encoding is performed on the received electric signal by a method unique to each media.
  • the electrical signals internally processed by the dedicated interface circuits 120, 122, 124, 126 in this way are converted to electro-optical converters (EZO) 108, 110, 112, 1 At 14 the electrical signal is converted to an optical signal.
  • the converted optical signals are multiplexed by the demultiplexing / combining devices 105 and 106, and transmitted as optical multiplexed signals through the optical fibers 103 and 104.
  • the optical multiplex signal received via the optical fibers 103 and 104 is Demultiplexing
  • a predetermined demultiplexing is performed by the multiplexers 105 and 106.
  • the demultiplexed optical signals are converted into electrical signals by photoelectric converters (OZE) 107, 109, 111, 113, and then retiming circuits 115 to 118 Is input to.
  • OZE photoelectric converters
  • the retiming circuits 115 to 118 detect a clock component by an encoding method peculiar to each media from the input electric signal. Then, by comparing the detected clock component with the known clock of each media, the phase shift due to the transmission path of the input signal is adjusted based on the external clock or the internal clock. Output to circuits 119, 121, 121, 123, and 125.
  • the electric signal whose phase shift has been adjusted is subjected to processing such as amplification and waveform shaping by a dedicated interface circuit 1 1 1, 1 2 1, 1 2 3, 1 2 5, and an electric signal suitable for each medium Is transmitted to each media connected to the signal lines L1 to L4.
  • the retiming circuits 115 to 118 are provided on the receiving side of the oral interfaces LM1 to LM4.
  • the clock component of the received signal By detecting the clock component of the received signal and comparing it with a known clock, the shift in the phase direction due to the transmission path of the received signal is adjusted, and the clock compensation of the received signal is performed. Can be suppressed and communication can be reliably performed for each media.
  • dedicated local modules are provided for each media, differences in the type of electrical signal frequency and differences in timing in the upper layer can be fully considered, and WDM transmission without communication failure Can be realized.
  • the signal lines L1 to L4 are electric signal lines, and devices connected to these are terminals for electric signals. May be optical signal lines, and devices connected to these may be optical signal terminals.
  • the signal lines L1 to L4 are optical signal lines, they are connected to the dedicated input and output circuits 1 19 to 1 26 in the oral modules LM 1 to LM 4, respectively.
  • a photoelectric converter (O / E) and an electro-optical converter (EZO) are installed between the high-frequency connectors 135 and 142, and an optical signal connector is used instead of the high-frequency connectors 135 to 142. Used.
  • the optical multiplexed signal received via the optical fibers 103 and 104 is subjected to predetermined demultiplexing by the demultiplexing / demultiplexing devices 105 and 106, and the photoelectric converter (O / O / E)
  • Optical signals are converted to electrical signals by 107, 109, 111, and 113.
  • the converted electric signal is clock-compensated by the re-timing circuits 115 to 118 by adjusting the phase shift of the received signal due to the transmission path carrier.
  • the clock-compensated electric signal is subjected to amplification, waveform shaping, and other processing by a dedicated interface circuit 119, 121, 122, 125, and then to an electro-optical converter (not shown).
  • EZO the signal is converted from an electrical signal to an optical signal and transmitted to each media connected to the signal lines L1 to L4.
  • FIG. 7 is a block diagram showing another configuration example in the WDM transmission apparatus 101 shown in FIG.
  • the same blocks as those shown in FIG. 6 are denoted by the same reference numerals.
  • Each of the remote modules RMl and RM2 and the local modules LM1 to LM4 included in the WDM transmission device 101 of the present embodiment is provided with or without the supplied optical signal or electric signal and with the type of the frequency of the supplied electric signal. It has a display unit (LED etc.) for displaying.
  • 150 is supplied from an optical signal connector (not shown).
  • a carrier detection circuit that detects the presence or absence of an optical signal 151 is a light-emitting diode (LED) that lights up when optical communication is being performed, and 152 is a dip switch (not shown) that changes the signal connection method by operating a dip switch
  • 15 3 154 are frequency detection circuits for detecting the frequency of electric signals, 155 is a power supply, 155, 157 are received signals according to external clocks or internal clocks. This is a retiming circuit that adjusts the timing.
  • LEDs light emitting diodes
  • Reference numeral 159 denotes a light emitting diode (LED) indicating the type of frequency of the electric signal, and the frequency of the electric signal is 100 Mb ps or 100 Mbps. Is indicated by any lighting.
  • Reference numeral 160 denotes a light emitting diode (LED) indicating a state of an electric signal.
  • LED light emitting diode
  • Reference numeral 161 denotes a light emitting diode (LED) indicating the type of frequency of the electric signal, and the frequency of the electric signal is 100 Mb ps or 100 Mbps. Is indicated by any lighting.
  • 16 2 and 16 3 are ⁇ R circuits that take the logical sum of two input electric signals.
  • SW 11 is a two-stage switch that is connected to the cross / straight switching circuit 15 2 and power supply 15 55, respectively, and detects whether the frequency of the electric signal is automatically detected or set manually. Make a selection.
  • the switch SW 11 is switched to an automatic side (A) or a manual side (M) by operating a dip switch (not shown).
  • SW12 is a two-stage switch for setting the frequency when the frequency of the electric signal is manually set by the switch SW11, and is operated by a dip switch (not shown). Switches to the 0 Mb ps side or 100 Mb ps side in conjunction with each other.
  • the optical signal from the optical fiber 103 constituting the multiplex transmission line is supplied to the carrier detection circuit 150.
  • the carrier detection circuit 150 detects the presence / absence of an optical signal. When the optical signal is detected, the LED 150 connected to the carrier detection circuit 150 is turned on.
  • the optical signal received through the optical fiber 103 is supplied to the demultiplexer / demultiplexer 105 via the carrier detection circuit 150 to perform predetermined demultiplexing. Then, the demultiplexed optical signal is converted into an electric signal by an photoelectric converter (OZE) 107 and input to two retiming circuits 156 and 157.
  • OZE photoelectric converter
  • These retiming circuits 156 and 157 detect a clock component by an encoding method peculiar to the media from the input electric signal, and check the detected clock component against a known clock of the media. Then, the shift in the phase direction due to the transmission of the input electric signal by the transmission path is adjusted based on the external clock or the internal clock.
  • These retiming circuits 156 and 157 are clock compensating circuits configured for each frequency of 100 Mbps and 100 Mbps.
  • the electrical signal is accurately clock-compensated by any of the re-imaging circuits.
  • the electric signal that has been compensated for here is supplied to the frequency detection circuit 154.
  • the frequency detection circuit 154 automatically detects the frequency of the input electrical signal. Detects and outputs a signal corresponding to the detected frequency to LED 161 that indicates the frequency of the electric signal received from the remote module RM1.
  • the above output to the ED 161 turns on the LED 161 corresponding to the frequency of the electrical signal received from the remote module RM1.
  • the OR circuit 163 ORs the output signals to the LED 161 to indicate that the electrical signal received by the local module LM 1 from the remote module RM 1 is flowing. LED 160 also lights.
  • the frequency detecting circuit 154 also selectively outputs an accurate electrical signal corresponding to the detected frequency to the cross-straight switching circuit 152.
  • the cross / straight switching circuit 15 2 transmits the received electric signal to the media connected to the signal line L1.
  • the electric signal sent from the media connected to signal line L1 will be cross-straight switching circuit
  • the signal is input to the frequency detection circuit 15 3 via 15 2. Further, a voltage is also supplied from the power supply 155 to the frequency detection circuit 153, and the frequency of the input electric signal is automatically detected.
  • the frequency detection circuit 153 outputs a signal corresponding to the detected frequency.
  • the output signal is supplied to the LED 159 which indicates the frequency of the electric signal to be transmitted to the remote module RM1, and is supplied to the port for each frequency of the electro-optical converter (EZO) 108. .
  • the above output to ED 159 turns on LED 159 corresponding to the frequency of the electrical signal to be transmitted to remote module RM 1.
  • the OR circuit 162 performs a logical OR operation on the output signals to the LEDs 159, and the electrical module LM1 transmits the electrical signal transmitted to the remote module RM1.
  • LED 158 which indicates that the signal is flowing, also lights.
  • the electric signal sent from the media connected to the signal line L1 is crossed. It is supplied to the switch SW 12 via the straight switching circuit 15 2. Then, according to the setting of the switch SW 12, it is supplied to the port for each frequency of the electro-optical converter (E / ⁇ ) 108.
  • the voltage from the power supply 155 is supplied to the LED 159 according to the setting of the switch SW12, and the LED 159 corresponding to the manually set frequency is turned on.
  • the OR circuit 162 performs a logical OR operation on the output signal to the LED 159, and the LED 158 indicates that the electric signal transmitted from the local module LM1 to the remote module RM1 is flowing. Also lights up.
  • the electric signal supplied to the electro-optical converter (EZO) 108 is converted into an optical signal here, and is multiplexed by the demultiplexer / demultiplexer 105. Then, the carrier is detected by the carrier detection circuit 150. Transmitted through the optical fiber 103 via the optical fiber 103.
  • the timing of the received signal is adjusted by the retiming circuits 156 and 157 based on the external clock or the internal clock. Can be suppressed and communication can be reliably performed for each media.
  • dedicated local modules are provided for each medium, differences in the frequency of electrical signals and differences in timing in upper layers can be fully considered, and WDMs without communication failure can be considered. Transmission can be realized.
  • the signal line L1 is an electric signal line
  • the device connected to the signal line L1 is an electric signal terminal.
  • the signal line L1 is an optical signal line and is connected thereto.
  • the device may be an optical signal terminal.
  • the cross-straight switching circuit 152 becomes unnecessary, and the signal line L1 becomes two optical fibers for transmission and reception.
  • An electro-optical converter (EZO) is provided between the frequency detection circuit 154 and the connector 135, and an opto-electric converter (OZE) is provided between the switch SW 11 and the connector 13 36.
  • An optical signal connector is used for 35 and 13.
  • FIG. 8 is a diagram showing another configuration example of the entire system for performing communication using the WDM transmission device of the present embodiment.
  • the same blocks as the blocks shown in FIG. 5 are denoted by the same reference numerals. I have.
  • reference numeral 201 denotes a WDM transmission device.
  • RM3 and RM4 are remote modules
  • MM2 is a management module for monitoring and managing WDM transmission equipment
  • LM5 to LM8 are local modules equipped with local interface circuits and the like corresponding to each media. is there.
  • L5 to L8 are signal lines for connecting each of the oral modules LM5 to LM8 with the corresponding device.
  • Two remote modules RM 1 and RM 2 Two remote modules RM 1 and RM 2, one management module MM 1, and four oral modules LM 1 to LM4; one W A DM transmission device is configured, and each of the remote modules RM 1 and RM 2 is connected to four local modules LM 1 to LM 4.
  • each remote module RM 3 , RM4 are connected to four local modules LM5 to LM8.
  • the WDM transmission device 201 is connected to the multiple transmission lines of the remote modules RM 1 and RM 3 and the remote modules RM 2 and RM 4 of the above two WDM transmission devices by a connection means described later, thereby forming one WDM transmission device. Another WDM transmission device is added to the transmission device.
  • FIG. 9 is a diagram showing a connection example of the remote modules RM 1 and RM 3 of the WDM transmission device 201 shown in FIG.
  • reference numerals 202 and 203 denote demultiplexers / combiners of the remote module RM3, and reference numerals 204 and 205 denote optical power plugs.
  • Reference numerals 206 and 207 denote optical fibers for connecting the remote modules RM1 and RM3, and the respective optical fibers 206 and 207 transmit transmission and reception signals.
  • Reference numeral 208 denotes an optical receptacle as a connector.
  • the optical signal received through the optical fibers 103 and 104 constituting the multiplex transmission line L100 is distributed by the optical power blurs 204 and 205 via the optical receptacle 208.
  • One is input to the multiplexer / demultiplexer 202, 203 in the remote module RM3, and the other is input via the optical fiber 206, 207 and the optical receptacle 208.
  • the signals are input to the demultiplexers / combiners 105 and 106 in the remote module RM1.
  • the input optical signal is subjected to predetermined demultiplexing by the demultiplexers / demultiplexers 10 5, 10 6, 20 2 and 20 3. Then, the signal is converted into an electric signal via a not-shown photoelectric converter (OZE) and transmitted to each roll module connected to each of the remote modules RM 1 and RM 3.
  • OZE photoelectric converter
  • the electric signals input from each of the oral modules to the remote modules RM 1 and RM 3 are converted into optical signals via an unillustrated electro-optical converter (EZO), and are split into demultiplexers / combiners 105, Synthesized by 106, 202, and 203.
  • the optical signals combined by the demultiplexers / combiners 105 and 106 are output from the remote module RM1 through the optical fibers 206 and 207, and the optical power in the remote module RM3 204 , 205 are input.
  • the optical power plugs 204 and 205 are connected to the optical signal transmitted from the remote module RM1 and the optical signal combined by the demultiplexer / combiner 202,203 in the remote module RM3. Is transmitted through the optical fibers 103 and 104.
  • the remote module of the WDM transmission device already used and the remote module of the WDM transmission device to be added are connected by using the optical power bra.
  • WDM transmission equipment with different frequencies can be easily added.
  • each WDM transmission device has two remote modules, WDM transmission devices can be added without interrupting communication.
  • the wavelength division multiplexing transmission apparatus is provided with the display unit indicating the presence or absence of a signal flowing through the multiplex transmission line and the display unit indicating the presence or absence and the type of the signal flowing through the local interface. Therefore, the signal is flowing properly during the construction of the communication network, etc. This is useful for easily checking whether the correct signal is flowing according to the connection partner of the evening face, etc., and realizes a practical wavelength division multiplex transmission device for operators and users.
  • the wavelength division multiplexing transmission apparatus is provided with setting means capable of designating whether to automatically detect or manually set the frequency of the signal flowing in the local interface. This is useful for confirming the construction of a communication network while easily checking the selection of the frequency according to the connection partner.
  • the wavelength division multiplexing transmission apparatus is provided with means for switching a signal connection method depending on whether the connection partner of the local interface is a terminal or a hub. It is useful for changing the method and realizing reliable construction.
  • the retiming circuit for performing clock compensation of the received signal is provided in the oral module, the phase shift of the received signal due to the data transmission over the transmission line is caused. This is useful for suppressing communication failures and achieving reliable communication for each media.
  • a dedicated local module is provided corresponding to the media, which is useful for WDM transmission that fully considers the difference in the type of electric signal frequency and the difference in timing in the upper layer. .
  • the wavelength division multiplex transmission apparatus connects the remote module of the wavelength division multiplex transmission apparatus already used and the remote module of the wavelength division multiplex transmission apparatus to be added using an optical power bra. This is useful for easily adding a wavelength division multiplex transmission device with a different frequency using the already laid optical fiber.

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

Abstract

L'invention porte sur un émetteur à multiplexage par division de longueur d'onde (WDM) comportant des connecteurs (7, 8) servant d'interface locale pour des signaux électriques, et un connecteur optique (4) relié à une ligne de transmission multiplexée de signaux optiques. L'émetteur WDM comporte en outre un écran (3) indiquant la présence d'un signal optique fourni à la ligne de transmission multiplexée, et un écran (9) indiquant la nature du signal optique fourni à l'interface locale. Comme il est facile de reconnaître la présence et la nature du signal adressé à chacune des interfaces, l'émetteur WDM est utile pour les opérateurs.
PCT/JP1999/004638 1998-08-28 1999-08-27 Emetteur a multiplexage par division de longueur d'onde WO2000013374A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP10/243554 1998-08-28
JP24355498 1998-08-28
JP11/127717 1999-05-07
JP11127717A JP2000324050A (ja) 1999-05-07 1999-05-07 Ｗｄｍ伝送装置

Publications (1)

Publication Number Publication Date
WO2000013374A1 true WO2000013374A1 (fr) 2000-03-09

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Application Number Title Priority Date Filing Date
PCT/JP1999/004638 WO2000013374A1 (fr) 1998-08-28 1999-08-27 Emetteur a multiplexage par division de longueur d'onde

Country Status (1)

Country Link
WO (1) WO2000013374A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09162918A (ja) * 1995-12-12 1997-06-20 Hitachi Cable Ltd リピーティングハブ
JPH1041032A (ja) * 1996-07-19 1998-02-13 Matsushita Electric Works Ltd ネットワーク集線装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09162918A (ja) * 1995-12-12 1997-06-20 Hitachi Cable Ltd リピーティングハブ
JPH1041032A (ja) * 1996-07-19 1998-02-13 Matsushita Electric Works Ltd ネットワーク集線装置

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