WO2017163993A1 - Système de transmission optique, appareil de transmission optique, et procédé de commande de système de transmission optique - Google Patents

Système de transmission optique, appareil de transmission optique, et procédé de commande de système de transmission optique Download PDF

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Publication number
WO2017163993A1
WO2017163993A1 PCT/JP2017/010080 JP2017010080W WO2017163993A1 WO 2017163993 A1 WO2017163993 A1 WO 2017163993A1 JP 2017010080 W JP2017010080 W JP 2017010080W WO 2017163993 A1 WO2017163993 A1 WO 2017163993A1
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Prior art keywords
optical transmission
signal
transmission
optical
frequency
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PCT/JP2017/010080
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English (en)
Japanese (ja)
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健史 小熊
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日本電気株式会社
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Publication of WO2017163993A1 publication Critical patent/WO2017163993A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/572—Wavelength control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems

Definitions

  • the present invention relates to an optical transmission system, an optical transmission apparatus, and an optical transmission system control method, and more particularly to an optical transmission system, an optical transmission apparatus, and an optical transmission system control method for performing wavelength division multiplexing communication.
  • WDM wavelength division multiplex
  • Super-CH super-channel
  • Patent Documents 1 to 3 are known as related technologies.
  • Patent Document 1 discloses that an optical transmission device that constitutes an optical network that performs WDM communication includes an optical filter that allows an optical signal of a predetermined band to pass therethrough.
  • Patent Document 2 discloses shifting the frequency of the intermediate subcarrier band in the SCH.
  • Patent Document 3 discloses measuring a subcarrier frequency interval in an optical OFDM (Orthogonal Frequency Division Multiplexing) signal.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the present invention has been made in view of such a problem, and an object of the present invention is to provide an optical transmission system, an optical transmission apparatus, and an optical transmission system control method capable of improving transmission characteristics.
  • An optical transmission system is an optical transmission system including a first optical transmission device and a second optical transmission device connected via an optical transmission line, and the first optical transmission device includes: A wavelength group signal transmitting unit that transmits a wavelength group signal obtained by combining a plurality of subcarrier signals to the second optical transmission device via the optical transmission path, and the wavelength among the plurality of subcarrier signals.
  • a transmission quality acquisition unit that acquires transmission quality information in the edge subcarrier signal at the end of the transmission band of the group signal from the second optical transmission device; and a frequency of the edge subcarrier signal based on the acquired transmission quality information
  • a frequency adjusting unit that adjusts the wavelength group signal receiving unit, wherein the second optical transmission device receives the wavelength group signal from the first optical transmission device via the optical transmission line.
  • a transmission quality measuring unit for measuring the transmission quality of the edge subcarrier signal in the received wavelength group signal, and a transmission quality notifying unit for notifying the first optical transmission apparatus of transmission quality information indicating the measured transmission quality Are provided.
  • One of the optical transmission devices includes: a wavelength group signal transmission unit that transmits a wavelength group signal obtained by combining a plurality of subcarrier signals to another optical transmission device via an optical transmission line; Based on the transmission quality information obtained from the other optical transmission device transmission quality information in the edge subcarrier signal at the end of the transmission band of the wavelength group signal among the subcarrier signals, A frequency adjusting unit that adjusts the frequency of the edge subcarrier signal.
  • One of the optical transmission devices includes a wavelength group signal receiving unit that receives a wavelength group signal obtained by combining a plurality of subcarrier signals from another optical transmission device via an optical transmission line, and the reception A transmission quality measuring unit that measures transmission quality of an edge subcarrier signal at an end of a transmission band of the wavelength group signal among the plurality of subcarrier signals included in the measured wavelength group signal, and transmission quality indicating the measured transmission quality A transmission quality notifying unit for notifying information to the other optical transmission device.
  • An optical transmission system control method is an optical transmission system control method comprising a first optical transmission device and a second optical transmission device connected via an optical transmission line,
  • the first optical transmission apparatus transmits a wavelength group signal obtained by combining a plurality of subcarrier signals to the second optical transmission apparatus via the optical transmission path, and the wavelength among the plurality of subcarrier signals is transmitted.
  • the second optical transmission device receives the wavelength group signal from the first optical transmission device via the optical transmission line, and transmits the edge subcarrier signal in the received wavelength group signal. It was measured, and notifies the transmission quality information indicating the transmission quality with the measured to the first optical transmission device.
  • an optical transmission system an optical transmission apparatus, and an optical transmission system control method capable of improving transmission characteristics.
  • FIG. 1 is a configuration diagram showing a schematic configuration of an optical transmission system according to an embodiment.
  • 1 is a configuration diagram illustrating a configuration example of an optical transmission system according to a first embodiment.
  • 2 is a configuration diagram illustrating a configuration example of a node according to Embodiment 1.
  • FIG. 3 is a configuration diagram illustrating a configuration example of a receiver of a node according to Embodiment 1.
  • FIG. 3 is a flowchart showing a carrier frequency adjustment method according to the first embodiment.
  • 3 is a flowchart showing a carrier frequency adjustment method according to the first embodiment.
  • FIG. 1 shows a configuration of an optical transmission system according to a basic example.
  • an optical transmission system 900 according to a basic example includes a transmission node 910, a plurality of relay nodes 920, and a reception node 930, and the nodes are connected via an optical transmission line OL. ing.
  • the transmission node 910 is a transmission device that transmits an SCH (Super Channel) signal, and includes a plurality of transmitters 911 (911_1 to 911_4) and a multiplexer 912. Transmitters 911_1 to 911_4 output subcarrier signals SF1 to SF4 having different carrier frequencies, and multiplexer 912 multiplexes subcarrier signals SF1 to SF4 to generate wavelength group signal SG.
  • the transmission node 910 transmits the SCH signal S0 including the wavelength group signal SG to the optical transmission line OL.
  • “multiplexing” means multiplexing of subcarriers within the same wavelength group.
  • the relay node 920 is a relay device that relays the SCH signal, and includes an optical filter FLT for wavelength branching insertion and cross connection.
  • the optical filter FLT has a filter characteristic that matches the band of the wavelength group signal SG, and allows only the wavelength group signal SG to pass therethrough.
  • the receiving node 930 is a receiving device that receives an SCH signal, and includes a plurality of receivers 931 (931_1 to 931_4) and a duplexer 932.
  • the demultiplexer 932 demultiplexes the wavelength group signal SG included in the received SCH signal S0 into subcarrier signals SF1 to SF4 of each carrier frequency, and the receivers 931_1 to 931_4 demultiplex the subcarrier signals SF1 to SF1 SF4 is received.
  • “demultiplexing” means subcarrier demultiplexing within the same wavelength group.
  • FIG. 2 is a graph showing the wavelength band of the SCH signal used in the basic example.
  • a plurality of subcarrier signals SF are arranged at narrow frequency intervals and grouped into one wavelength group signal SG.
  • the wavelength group signal SG is a set of a plurality of subcarrier signals SF (consisting of a plurality of subcarrier signals SF), and the signals SG of the same wavelength group are ADD / DROP by the same element (node, etc.).
  • one wavelength group signal SG includes four subcarrier signals SF1 to SF4.
  • an arbitrary number of subcarrier signals may be included.
  • the SCH signal S0 is not limited to the two wavelength group signals SG1 to SG2, and may include any number of wavelength group signals.
  • FIG. 3 shows an image of band narrowing after multistage relaying of optical signals in the basic example.
  • the amount of loss of bandwidth narrowing (Bandwidth constriction) in the optical signal due to filter narrowing depends on the narrowing effect of the optical filter FLT, but depends on the bandwidth of each filter, the center frequency accuracy, and the number of pass stages of the filter .
  • the wavelength group signal SG is obtained by wavelength-multiplexing the subcarrier signals SF1 to SF4 of the carrier frequencies f1 to f4, and the pass characteristics (filter characteristics) of the optical filter after multistage relaying with respect to the wavelength group signal SG. ) FC applies.
  • band narrowing occurs in the CUT region. Band narrowing occurs because the filter pass band is narrower than the signal occupation band (wavelength group signal transmission band) of the transmitted optical signal, and the carrier frequency (carrier) arranged at the edge of the filter pass band Occurs at frequencies f1 and f4).
  • FIG. 4 shows the mechanism of band narrowing by paying attention to the subcarrier signal SF1 of FIG.
  • the band narrowing mechanism is the same for the subcarrier signal SF4, and thus the description thereof is omitted.
  • FIG. 4B shows a state in which band narrowing occurs in the subcarrier signal SF1 having the carrier frequency f1, as in FIG. 3, and FIGS. 4A and 4C show the carrier frequency.
  • the band narrowing state is shown when f1 is shifted in the opposite direction.
  • the carrier frequency f1 of the subcarrier signal SF1 is shifted from the state of FIG. 4B to the side (transmission band end side) that is farther from the carrier frequency f2 of the adjacent subcarrier signal SF2. (Shifted to the negative side by ⁇ f1).
  • the influence of the band narrowing becomes larger as shown in the CUT region, while the overlap between subcarriers is reduced as shown in the OVL region.
  • the graph of FIG. 5 shows the relationship between the frequency shift amount ( ⁇ f1) of the carrier frequency f1 and the transmission quality.
  • characteristic a11 in FIG. 5 the transmission quality deteriorates as the frequency shifts from the optimum point ( ⁇ f1opt) with the best transmission quality to the negative side (side away from f2).
  • This negative degradation characteristic a11 is mainly caused by quality degradation due to band narrowing (increase in CUT region) due to multi-step passage of the optical filter.
  • the transmission quality deteriorates as the frequency shifts from the optimum point ( ⁇ f1opt) to the positive side (side closer to f2).
  • This main degradation characteristic a12 is mainly caused by quality degradation due to crosstalk (an increase in the OVL region) due to overlap with the adjacent subcarrier (f2).
  • the embodiment is characterized in that, in a wavelength division multiplexing transmission apparatus, high transmission quality is realized by suppressing deterioration of transmission performance due to the narrowing effect of an optical filter, which is a problem particularly when passing through a large number of nodes. To do.
  • the transmission quality information at the receiving end is fed back to the light source at the transmitting end, and the carrier frequency of the light source (carrier wave, for example, the laser oscillation frequency of the light source) is finely adjusted. .
  • FIG. 6 shows an outline of the optical transmission system according to the embodiment.
  • the optical transmission system 1 according to the embodiment includes an optical transmission device 10 that is a transmission node and an optical transmission device 20 that is a reception node connected via an optical transmission line OL.
  • the optical transmission device 10 includes a wavelength group signal transmission unit 11, a transmission quality acquisition unit 12, and a frequency adjustment unit 13.
  • the wavelength group signal transmission unit 11 transmits a wavelength group signal obtained by combining a plurality of subcarrier signals to the optical transmission device 20 via the optical transmission line OL.
  • the transmission quality acquisition unit 12 acquires the transmission quality information in the edge subcarrier signal at the end of the transmission band of the wavelength group signal among the plurality of subcarrier signals from the optical transmission device 20.
  • the frequency adjusting unit 13 adjusts the frequency of the edge subcarrier signal at the end of the transmission band based on the transmission quality information acquired from the transmission quality acquiring unit 12.
  • the edge subcarrier signal is a signal whose band is narrowed by a filter while being transmitted from the optical transmission apparatus 10 to the optical transmission apparatus 20.
  • the edge subcarrier signal may be one or both of the maximum frequency subcarrier signal (first edge subcarrier signal) and the minimum frequency subcarrier signal (second edge subcarrier signal) in the wavelength group signal. .
  • the optical transmission device 20 includes a wavelength group signal receiving unit 21, a transmission quality measuring unit 22, and a transmission quality notifying unit 23.
  • the wavelength group signal receiving unit 21 receives the wavelength group signal from the optical transmission device 10 via the optical transmission line OL.
  • the transmission quality measuring unit 22 measures the transmission quality of the edge subcarrier signal at the transmission band edge of the received wavelength group signal.
  • the transmission quality notifying unit 23 notifies the optical transmission apparatus 10 of transmission quality information indicating the transmission quality measured by the transmission quality measuring unit 22.
  • the frequency of the edge subcarrier signal (including the first edge subcarrier signal and the second edge subcarrier signal at both ends of the transmission band) at the transmission band end of the wavelength group signal is determined.
  • the influence of the band narrowing can be suppressed, so that transmission characteristics can be improved.
  • This embodiment is characterized in that the influence of band narrowing is minimized by setting the carrier frequency at the transmission end to an optimum value.
  • a signal affected by band narrowing is detected from the arrangement of the optical filter and the carrier, and the carrier oscillation frequency of the signal is finely adjusted and received. Measure the transmission quality at the end.
  • the optimum carrier oscillation frequency is estimated from the measurement result of transmission quality at the receiving end, and the carrier frequency at the transmitting end is set to the optimum value, thereby minimizing the influence of band narrowing.
  • FIG. 7 shows a configuration example of the optical transmission system according to the present embodiment.
  • the optical transmission system 1 according to the present embodiment includes a plurality of nodes (optical transmission devices) 110 to 140 and a network monitoring device (NMS: Network Management System) 200.
  • the optical transmission system 1 is not limited to the four nodes 110 to 140, and may include an arbitrary number of nodes.
  • the nodes 110 to 140 are each connected by an optical transmission line OL such as an optical fiber, and SCH transmission is possible via the optical transmission line OL.
  • the nodes 110 to 140 constitute a WDM (SCH) network 2.
  • the WDM network 2 is a linear network, but may be a network of another topology such as a ring network or a mesh network.
  • the node 110 is a transmission node (transmission end node) serving as a transmission end of the optical path
  • the nodes 120 and 130 are relay nodes that relay the optical path
  • the node 140 is a reception end of the optical path. It is a receiving node (receiving end node).
  • Each node 110 to 140 has basically the same configuration.
  • Each of the nodes 110 to 140 is connected to an optical transmission unit 101 (101_1 to 101_4) that performs SCH transmission via the optical transmission line OL, and an optical monitoring control unit 102 that monitors transmission quality and exchanges information such as quality information between the nodes. (102_1 to 102_4).
  • Each of the nodes 110 to 140 further includes a node control unit 103 (103_1 to 103_4) that performs monitoring control of the node based on the control from the network monitoring apparatus 200.
  • a part or all of the optical monitoring control unit 102 and the node control unit 103 may be provided inside the optical transmission unit 101 (or the same block as the optical transmission unit 101).
  • the light monitoring control unit 102 has a function necessary for transmitting and receiving quality information between the transmission node 110 and the reception node 140.
  • the optical supervisory control unit 102_1 in the transmission node 110 receives a quality information request unit 102a that requests quality information of the subcarrier signal received by the reception node 140 via the control line CL, and the reception node 140 via the control line CL.
  • Quality information acquisition unit 102b for acquiring quality information from The optical supervisory control unit 102_4 in the reception node 140 measures the quality of the subcarrier signal received in the optical transmission unit 101 in accordance with a request from the transmission node 110, and the measured quality information via the control line CL.
  • a quality information notification unit 102d for notifying the transmission node 110.
  • the node control unit 103 has a function necessary for controlling the subcarrier frequency (carrier frequency of the subcarrier signal) to the optimum value in the transmission node 110.
  • the node control unit 103_1 in the transmission node 110 includes a carrier frequency determination unit 103a that determines a subcarrier frequency based on the quality information acquired from the reception node 140.
  • the node control unit 103_1 further includes a carrier frequency setting unit 103b that sets the determined subcarrier frequency in the transmitter of the optical transmission unit 101, and a measurement quality storage unit 103c that stores the acquired quality information in association with the carrier frequency. I have.
  • the network monitoring device (network control unit) 200 is a monitoring device (control device) that integrally monitors (controls) the nodes 110 to 140.
  • the network monitoring apparatus 200 is connected to the nodes 110 to 140 via a management network 3 such as a LAN (Local Area Network), and manages settings and communication states of the nodes 110 to 140 via the management network 3.
  • a path setting unit 201 that sets paths in the nodes 110 to 140
  • a filter characteristic collecting unit 202 that collects filter characteristics from the nodes 110 to 140
  • carrier frequency management that sets subcarriers to be controlled in the node 110
  • the unit 203 is provided.
  • FIG. 8 shows a configuration example of a node (optical transmission unit) according to the present embodiment.
  • FIG. 8 is a configuration example of the optical transmission unit 101 of the nodes 110 to 140 in FIG.
  • the optical transmission unit 101 includes transmitters TX1 to TX8, receivers RX1 to RX8, multiplexers / demultiplexers AG1 to AG3, optical cross connects XF1 to XF2, and optical amplifiers CA1 to CA2. ing.
  • the optical transmission unit 101_1 in the transmission node 110 has only a configuration necessary for transmitting the SCH signal (for example, transmitters TX1 to TX8, multiplexers AG1 to AG3, optical cross connects XF1 to XF2, optical amplifiers CA1 to CA2). May be provided.
  • the optical transmission units 101_2 and 101_3 in the relay nodes 120 and 130 may include only the configuration (optical cross connects XF1 to XF2, optical amplifiers CA1 to CA2) necessary for relaying the SCH signal.
  • the optical transmission unit 101_4 in the reception node 140 has only the configuration necessary for receiving the SCH signal (receivers RX1 to RX8, multiplexers / demultiplexers AG1 to AG3, optical cross connects XF1 to XF2, optical amplifiers CA1 to CA2). You may have.
  • any number of transmitters, receivers, multiplexers / demultiplexers, optical cross-connects, and optical amplifiers may be provided according to subcarriers, wavelength groups, routes, and the like.
  • Transmitters (transponders) TX1 to TX8 are each connected to a client device (not shown). Transmitters TX1 to TX8 generate a SCH transmission subcarrier signal SF (subcarrier signal of a set frequency) from a signal input from a client apparatus, and the generated subcarrier signal SF is combined with multiplexers / demultiplexers AG1 to AG1. Output to AG3.
  • the receivers RX1 to RX8 are connected to the client device in the same manner as the transmitter TX.
  • the receivers RX1 to RX8 generate a signal of the client device from each subcarrier signal SF demultiplexed by the multiplexers / demultiplexers AG1 to AG3, and output the generated signal to the client device.
  • the multiplexers / demultiplexers AG1 to AG3 multiplex the subcarrier signal SF into the wavelength group signal SG, and demultiplex the wavelength group signal SG into the subcarrier signal SF.
  • the multiplexer / demultiplexer AG1 generates a wavelength group signal SG by multiplexing the subcarrier signals SF from the transmitters TX1 to TX4, and outputs the generated wavelength group signal SG to the optical cross connect XF1 or XF2. Further, the multiplexer / demultiplexer AG1 demultiplexes the wavelength group signal SG from the optical cross connect XF1 or XF2, generates a subcarrier signal SF, and outputs the generated subcarrier signal SF to the receivers RX1 to RX4.
  • the multiplexer / demultiplexer AG2 generates a wavelength group signal SG by combining the subcarrier signals SF from the transmitters TX5 to TX6, and outputs the generated wavelength group signal SG to the optical cross connect XF1. Further, the multiplexer / demultiplexer AG2 demultiplexes the wavelength group signal SG from the optical cross connect XF1, generates a subcarrier signal SF, and outputs the generated subcarrier signal SF to the receivers RX5 to RX6.
  • the multiplexer / demultiplexer AG3 generates a wavelength group signal SG by combining the subcarrier signals SF from the transmitters TX7 to TX8, and outputs the generated wavelength group signal SG to the optical cross connect XF2. Further, the multiplexer / demultiplexer AG3 demultiplexes the wavelength group signal SG from the optical cross connect XF2, generates a subcarrier signal SF, and outputs the generated subcarrier signal SF to the receivers RX7 to RX8.
  • the optical cross-connects XF1 to XF2 are provided with wavelength selection switches (not shown), and are optical switches that perform switching (including add / drop) according to the wavelength.
  • the optical cross connects XF1 to XF2 include optical filters FLT1 and FLT2 for performing wavelength switching.
  • the optical cross-connect XF1 has a wavelength of the wavelength group signal SG (and the wavelength group signal in the SCH signal S0) from the multiplexers / demultiplexers AG1 and AG2, the optical amplifier CA1, and the optical cross-connect XF2 (and other optical cross-connects XF). Depending on, it switches and outputs to any one of the routes.
  • the optical cross-connect XF2 uses the wavelength group signal SG (and the wavelength group signal in the SCH signal S0) from the multiplexers / demultiplexers AG1 and AG3, the optical amplifier CA2, and the optical cross-connect XF1 (and other optical cross-connects XF) as wavelengths. Depending on, it switches and outputs to any one of the routes.
  • the optical amplifiers CA1 to CA2 amplify optical signals between the optical transmission line OL and the optical cross connects XF1 to XF2.
  • the optical amplifiers CA1 to CA2 receive and amplify SCH signals S0 (including wavelength group signals) from other nodes via the optical transmission line OL, and output the amplified SCH signals S0 to the optical cross connects XF1 to XF2.
  • the optical amplifiers CA1 to CA2 amplify the SCH signal S0 (including the wavelength group signal) from the optical cross connects XF1 to XF2, and output the amplified SCH signal S0 to other nodes via the optical transmission line OL.
  • FIG. 9 shows the configuration of the receiver RX according to the present embodiment.
  • FIG. 9 is a configuration example of the receivers RX1 to RX8 of the optical transmission unit 101 in FIG. 8, and shows an example in which quality measurement is performed in the receiver.
  • the receiver RX includes an OE (Optical-to-Electrical) converter 41, an AD (Analog-to-Digital) converter 42, a decoder 43, and a quality measuring unit 44.
  • OE Optical-to-Electrical
  • AD Analog-to-Digital
  • the OE converter 41 photoelectrically converts the subcarrier signal SF, which is an optical signal from the multiplexer / demultiplexer AG, into an analog signal, and outputs the converted analog signal.
  • the AD converter 42 AD converts the analog signal generated by the OE converter 41 into a digital signal, and outputs the converted digital signal.
  • the decoder 43 decodes the digital signal generated by the AD converter 42 into decoded data according to a predetermined error correction decoding method, and outputs the decoded data to an external client device.
  • the quality measuring unit 44 measures the transmission quality of the subcarrier signal based on the digital signal generated by the AD converter 42. For example, the quality measuring unit 44 calculates a Q value before error correction, a bit error rate (BER), and the like as transmission quality.
  • the Q value can be calculated from the BER. By calculating the BER before performing error correction by decoding, the transmission quality can be measured effectively.
  • the optical transmission apparatuses at the transmission end and the reception end of the optical transmission system share in advance information on subcarrier signals to be transmitted and received when performing a carrier frequency adjustment operation.
  • the optical transmission device at the receiving end can calculate the BER by comparing the information of the subcarrier signal shared in advance with the actually received subcarrier signal when performing the carrier frequency adjustment operation. Further, the information on the subcarrier signal transmitted and received when performing the adjustment operation of the carrier frequency may be notified to the optical transmission devices at the transmission end and the reception end when the network monitoring device 200 starts the adjustment operation.
  • 10A and 10B show the carrier frequency adjustment method according to the present embodiment.
  • the network monitoring apparatus 200 first sets a wavelength path for performing SCH transmission (S101).
  • the path setting unit 201 of the network monitoring apparatus 200 sets a new wavelength path (for example, a wavelength group signal including four subcarriers) according to an instruction from an operator (not shown).
  • the network monitoring apparatus 200 collects the signal used for the wavelength path and the filter characteristics from each node (or its own setting information) (S102).
  • the filter characteristic collection unit 202 of the network monitoring apparatus 200 receives optical filters (for example, FLT1 and FLT2) in the optical transmission unit 101 corresponding to the path of the wavelength path (wavelength group signal) from the node control unit 103 of the nodes 110 to 140. ) Filter characteristics.
  • the filter characteristic collection unit 202 acquires, for example, the center frequency and bandwidth of the pass band as the filter characteristic.
  • the network monitoring apparatus 200 may store the optical filter characteristic information of each node in advance, and may acquire the optical filter characteristic corresponding to the wavelength path from the stored information.
  • the network monitoring apparatus 200 extracts a subcarrier where band narrowing occurs and determines a subcarrier to be controlled (S103).
  • the carrier frequency management unit 203 of the network monitoring apparatus 200 extracts subcarriers in which band narrowing occurs from the filter characteristics and wavelength path (wavelength group signal) setting information collected in S102, and extracts the extracted subcarriers.
  • the network monitoring apparatus 200 transmits a frequency control instruction for the control target carrier to the transmission node 110 (S104).
  • the carrier frequency management unit 203 of the network monitoring apparatus 200 starts the subcarrier frequency control and instructs the node control unit 103 of the transmission node 110 to control the control target carriers (f1 and f4) (optimum setting instruction).
  • Send a frequency control instruction for the control target carrier to the transmission node 110 (S104).
  • the carrier frequency management unit 203 of the network monitoring apparatus 200 starts the subcarrier frequency control and instructs the node control unit 103 of the transmission node 110 to control the control target carriers (f1 and f4) (optimum setting instruction).
  • the transmitting node 110 that received the instruction shifts the carrier frequency of the carrier to be controlled in the first direction (the direction from the end of the wavelength group band toward the center) (S105).
  • the node control unit 103 of the transmission node 110 sets the carrier frequency offset amounts ⁇ f1 and ⁇ f4 of the carrier frequencies f1 and f4 of the controlled carrier so that the carrier frequencies f1 and f4 shift to the carrier frequencies f2 and f3, respectively.
  • the node control unit 103 (carrier frequency setting unit 103b) performs carrier frequencies f1 and f4 of subcarrier signals output from the transmitter TX (for example, TX1 and TX4) of the optical transmission unit 101 based on the carrier frequency offset amounts ⁇ f1 and ⁇ f4. To change.
  • the transmission node 110 requests transmission quality information of the control target carrier from the reception node 140 while transmitting the subcarrier signal of the changed carrier frequency (S106).
  • the optical supervisory control unit 102 (quality information request unit 102a) of the transmission node 110 requests the transmission quality information of the carrier frequencies f1 and f4 from the reception node 140.
  • the receiving node 140 that has received the request collects transmission quality information of the carrier to be controlled in accordance with the request and notifies the transmitting node 110 of the transmission quality information (S107).
  • the optical monitoring control unit 102 quality measurement unit 102c of the reception node 140 transmits the transmission quality information (Q before error correction) of the carrier frequencies f1 and f4 measured by the receiver RX (for example, RX1 and RX4) of the optical transmission unit 101. Value, bit error rate, etc.).
  • the optical monitoring control unit 102 (quality information notification unit 102d) transmits the acquired transmission quality information to the transmission node 110.
  • the transmitting node 110 that has received the notification associates and stores the received quality information and the value of the carrier frequency offset amount ⁇ f (S108).
  • the optical monitoring control unit 102 quality information acquisition unit 102b of the transmission node 110 associates the received quality information of the carrier frequencies f1 and f4 with the currently set carrier frequency offset amounts ⁇ f1 and ⁇ f4 to measure the measurement quality.
  • the transmission node 110 shifts the carrier frequency of the carrier to be controlled in the second direction (the direction from the center of the wavelength group band toward both ends) (S109).
  • the node control unit 103 of the transmission node 110 sets the carrier frequency offset amounts ⁇ f1 and ⁇ f4 so that the carrier frequencies f1 and f4 are shifted away from the carrier frequencies f2 and f3, respectively.
  • the node control unit 103 sets the carrier frequency offset amounts ⁇ f1 and ⁇ f4 to about 2% of the design frequency interval from the current setting value to the adjacent carrier (for example, if the design interval of f1 and f2 is 50 GHz). The amount of change is set to about 1 GHz).
  • the node control unit 103 (carrier frequency setting unit 103b) transmits the transmitter of the optical transmission unit 101 based on the updated values of the carrier frequency offset amounts ⁇ f1 and ⁇ f4.
  • the carrier frequencies f1 and f4 of the subcarrier signal output from TX are changed.
  • the transmission node 110 requests the transmission quality information of the control target carrier from the reception node 140 (S110).
  • the receiving node 140 that has received the request collects transmission quality information of the carrier to be controlled in accordance with the request and notifies the transmitting node 110 of it (S111).
  • the transmission node 110 associates and stores the received quality information and the value of the carrier frequency offset amount ⁇ f (S112).
  • the frequency shifting in the opposite second direction at the second pitch is repeated to a predetermined range, Measure transmission quality.
  • a small frequency shift in the reverse first direction may be repeated up to a predetermined range to measure the transmission quality. If the frequency is greatly shifted in the second direction, the signal may be interrupted and quality measurement may not be possible. Therefore, it is preferable to repeat the frequency shift in the second direction after the frequency shift in the first direction.
  • the transmission node 110 calculates the optimum value of the carrier frequency offset amount ⁇ f based on the measured quality information (S114). For example, the node control unit 103 (carrier frequency determination unit 103a) of the transmission node 110 calculates the offset amounts ⁇ f1opt and ⁇ f4opt that provide the best transmission quality from the carrier frequency offset amount ⁇ f and quality information stored in the measurement quality storage unit 103c. calculate. Actual values may be used for calculating the optimum value, or a general statistical processing method (such as least squares or polynomial approximation) may be used. Further, a frequency having better transmission quality than a predetermined threshold value may be set as the optimum value.
  • a general statistical processing method such as least squares or polynomial approximation
  • the transmission node 110 sets the carrier frequency of the carrier to be controlled based on the optimum value of the frequency offset amount ⁇ f (S115).
  • the node control unit 103 (carrier frequency setting unit 103b) of the transmission node 110 sets the carrier frequency offset amount ⁇ f1 to ⁇ f1opt and sets the carrier frequency offset amount ⁇ f4 to ⁇ f4opt.
  • the node control unit 103 (carrier frequency setting unit 103b) changes the carrier frequencies f1 and f4 of the subcarrier signal output from the transmitter TX of the optical transmission unit 101 based on the carrier frequency offset amounts ⁇ f1opt and ⁇ f4opt.
  • control method of the present embodiment there is a concern that the transmission quality of the subcarrier signals of the carrier frequencies f2 and f3 deteriorates due to crosstalk.
  • the amount is sufficiently smaller than the band narrowing, and the control method of the present embodiment is a desirable operation from the viewpoint of equalizing the transmission quality between the four subcarriers.
  • the operating point with the best transmission quality is searched and set by finely adjusting the frequency, so that the transmission performance is deteriorated due to the band narrowing. Can be minimized.
  • the transmission quality of the channels at both ends affected by the band narrowing is deteriorated during SCH transmission.
  • the influence of band narrowing is reduced, and instead, the contribution of crosstalk between adjacent carriers is increased. ing.
  • the transmission quality degradation is shared with the adjacent carrier, so that it is possible to make the transmission quality uniform between the carriers, particularly during SCH transmission.
  • the optical monitoring control unit is used as the information transfer means, but information transfer via a network monitoring device may of course be used.
  • the part (frequency determining unit or frequency setting unit) that performs calculation or setting may be a node control unit of the reception node or a network monitoring control unit instead of the node control unit of the transmission node.
  • the quality measurement is not limited to the quality measurement at the receiving node, and the quality measurement may be performed at the relay node that performs the regeneration.
  • the frequencies of the two edge carrier signals at both ends of the transmission band are controlled simultaneously, one edge carrier signal may be controlled and then the other edge carrier signal may be controlled. Further, only one of the edge carrier signals may be controlled.
  • Each configuration (optical transmission device and network monitoring device) in the above-described embodiment is configured by hardware or software, or both, and may be configured by one piece of hardware or software.
  • each configuration in the above-described embodiment may be configured by a plurality of hardware or software.
  • Each function (each process) of the wireless device may be realized by a computer having a CPU, a memory, and the like.
  • a program for performing the frequency adjustment method according to the embodiment may be stored in the storage device, and each function may be realized by executing the program stored in the storage device by the CPU.
  • Non-transitory computer readable media include various types of tangible storage media (tangible storage medium). Examples of non-transitory computer-readable media include magnetic recording media (eg flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (eg magneto-optical discs), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable ROM), flash ROM, RAM (random access memory)) are included.
  • the program may also be supplied to the computer by various types of temporary computer-readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves.
  • the temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.
  • An optical transmission system comprising a first optical transmission device and a second optical transmission device connected via an optical transmission line
  • the first optical transmission device is: Wavelength group signal transmitting means for transmitting a wavelength group signal obtained by combining a plurality of subcarrier signals to the second optical transmission device via the optical transmission path; Transmission quality acquisition means for acquiring, from the second optical transmission device, transmission quality information on an edge subcarrier signal at an end of a transmission band of the wavelength group signal among the plurality of subcarrier signals; Frequency adjusting means for adjusting the frequency of the edge subcarrier signal based on the acquired transmission quality information;
  • the second optical transmission device is: Wavelength group signal receiving means for receiving the wavelength group signal from the first optical transmission device via the optical transmission line; Transmission quality measuring means for measuring the transmission quality of the edge subcarrier signal in the received wavelength group signal; Transmission quality notifying means for notifying the first optical transmission device of transmission quality information indicating the measured transmission quality;
  • An optical transmission system comprising:
  • the edge subcarrier signal is a subcarrier signal whose bandwidth is narrowed while being transmitted from the first optical transmission device to the second optical transmission device.
  • the optical transmission system according to appendix 1.
  • the edge subcarrier signal includes at least one of a first edge subcarrier signal having a maximum frequency and a second edge subcarrier signal having a minimum frequency among a plurality of subcarrier signals in the wavelength group signal.
  • the optical transmission system according to appendix 1 or 2.
  • the frequency adjusting means adjusts the frequency of the edge subcarrier signal to an optimum value based on transmission quality information at a plurality of frequencies measured by shifting the frequency of the edge subcarrier signal.
  • the optical transmission system according to any one of appendices 1 to 3.
  • the frequency adjusting means includes the transmission quality information measured when the frequency of the edge subcarrier signal is shifted from the end of the transmission band of the wavelength group signal toward the center, and the center of the transmission band of the wavelength group signal. Adjusting the frequency of the edge subcarrier signal to an optimum value based on the transmission quality information measured when the frequency of the edge subcarrier signal is shifted from the edge side to the end side, The optical transmission system according to appendix 4.
  • the frequency adjusting means shifts the frequency of the edge subcarrier signal from the end of the transmission band to the center side, and then repeats the frequency shift of the edge subcarrier signal from the center of the transmission band to the end side. Measuring transmission quality information, The optical transmission system according to appendix 5.
  • the frequency adjusting means shifts the frequency of the edge subcarrier signal from the center of the transmission band to the end side, and then repeats the frequency shift of the edge subcarrier signal from the end of the transmission band to the center side. Measuring transmission quality information, The optical transmission system according to appendix 5.
  • the optimum value is a frequency corresponding to transmission quality information with the best transmission quality.
  • the optical transmission system according to any one of appendices 4 to 7.
  • the optimum value is a frequency corresponding to transmission quality information whose transmission quality is better than a predetermined threshold.
  • the optical transmission system according to any one of appendices 4 to 7.
  • a wavelength group signal transmitting means for transmitting a wavelength group signal obtained by combining a plurality of subcarrier signals to another optical transmission device via an optical transmission line;
  • Transmission quality acquisition means for acquiring transmission quality information in the edge subcarrier signal at the transmission band end of the wavelength group signal among the plurality of subcarrier signals from the other optical transmission device;
  • Frequency adjusting means for adjusting the frequency of the edge subcarrier signal based on the acquired transmission quality information;
  • Wavelength group signal receiving means for receiving a wavelength group signal obtained by combining a plurality of subcarrier signals from another optical transmission device via an optical transmission line; Transmission quality measuring means for measuring the transmission quality in the edge subcarrier signal at the end of the transmission band of the wavelength group signal among the plurality of subcarrier signals included in the received wavelength group signal; Transmission quality notification means for notifying the other optical transmission apparatus of transmission quality information indicating the measured transmission quality;
  • An optical transmission device comprising:
  • a control method of an optical transmission system comprising a first optical transmission device and a second optical transmission device connected via an optical transmission line
  • the first optical transmission device is: Transmitting a wavelength group signal obtained by combining a plurality of subcarrier signals to the second optical transmission device via the optical transmission line; Obtaining the transmission quality information in the edge subcarrier signal at the end of the transmission band of the wavelength group signal among the plurality of subcarrier signals from the second optical transmission device; Based on the acquired transmission quality information, adjust the frequency of the edge subcarrier signal,
  • the second optical transmission device is: Receiving the wavelength group signal from the first optical transmission device via the optical transmission line; Measuring the transmission quality of the edge subcarrier signal in the received wavelength group signal; Notifying the first optical transmission device of transmission quality information indicating the measured transmission quality; A method for controlling an optical transmission system.
  • Optical transmission system 1 Optical transmission system 2 WDM network 3 Management network 10 Optical transmission apparatus 11 Wavelength group signal transmission part 12 Transmission quality acquisition part 13 Frequency adjustment part 20 Optical transmission apparatus 21 Wavelength group signal reception part 22 Transmission quality measurement part 23 Transmission quality notification part 41 OE converter 42 AD converter 43 Decoder 44 Quality measurement unit 101 Optical transmission unit 102 Optical monitoring control unit 102a Quality information request unit 102b Quality information acquisition unit 102c Quality measurement unit 102d Quality information notification unit 103 Node control unit 103a Carrier frequency determination unit 103b Carrier frequency setting unit 103c Measurement quality storage unit 110 Node (transmission node) 120, 130 nodes (relay nodes) 140 nodes (receiving node) DESCRIPTION OF SYMBOLS 200 Network monitoring apparatus 201 Path setting part 202 Filter characteristic collection part 203 Carrier frequency management part 900 Optical transmission system 910 Transmission node 911 Transmitter 912 multiplexer 920 Relay node 930 Reception node 931 Receive

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)

Abstract

L'invention vise à fournir un système de transmission optique apte à améliorer les caractéristiques de transmission. Un système de transmission optique selon l'invention comprend un appareil de transmission optique 10 et un appareil de transmission optique 20. L'appareil de transmission optique 10 comprend : une unité de transmission de signal de groupe de longueurs d'onde 11 qui transmet un signal de groupe de longueurs d'onde obtenu par synthèse d'une pluralité de signaux de sous-porteuse à l'appareil de transmission optique 20; une unité d'acquisition de qualité de transmission qui acquiert des informations de qualité de transmission concernant un signal de sous-porteuse de bord depuis l'appareil de transmission optique 20; et une unité d'ajustement de fréquence 13 qui ajuste la fréquence du signal de sous-porteuse de bord sur la base des informations de qualité de transmission. L'appareil de transmission optique 20 comprend : une unité de réception de signal de groupe de longueurs d'onde 21 qui reçoit le signal de groupe de longueurs d'onde, de l'appareil de transmission optique; une unité de mesure de qualité de transmission 22 qui mesure la qualité de transmission du signal de sous-porteuse de bord dans le signal de groupe de longueurs d'onde reçu; et une unité de notification de qualité de transmission 23 qui notifie à l'appareil de transmission optique 10 les informations de qualité de transmission indiquant la qualité de transmission mesurée.
PCT/JP2017/010080 2016-03-23 2017-03-14 Système de transmission optique, appareil de transmission optique, et procédé de commande de système de transmission optique WO2017163993A1 (fr)

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