WO2012039133A1 - Optical transmission system - Google Patents

Optical transmission system Download PDF

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Publication number
WO2012039133A1
WO2012039133A1 PCT/JP2011/005310 JP2011005310W WO2012039133A1 WO 2012039133 A1 WO2012039133 A1 WO 2012039133A1 JP 2011005310 W JP2011005310 W JP 2011005310W WO 2012039133 A1 WO2012039133 A1 WO 2012039133A1
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WO
WIPO (PCT)
Prior art keywords
optical
optical signal
gbps
transmission
transmission rate
Prior art date
Application number
PCT/JP2011/005310
Other languages
French (fr)
Japanese (ja)
Inventor
和典 岡田
聡志 石飛
政利 片山
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三菱電機株式会社
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Publication of WO2012039133A1 publication Critical patent/WO2012039133A1/en

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    • 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
    • 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
    • H04B10/27—Arrangements for networking
    • H04B10/272—Star-type networks or tree-type networks
    • 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
    • H04J14/0247—Sharing one wavelength for at least a group of ONUs
    • 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
    • H04J14/0227—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
    • H04J14/0252—Sharing one wavelength for at least a group of ONUs, 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
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0256—Optical medium access at the optical channel layer
    • H04J14/026—Optical medium access at the optical channel layer using WDM channels of different transmission rates

Definitions

  • the present invention is a GE-PON (Gigabit Ethernet Passive Optical Network) equipped with a central office side optical signal transmission device (OLT: Optical Line Terminal) and a plurality of subscriber side optical signal transmission devices (ONU: Optical Network Unit).
  • OLT Central office side optical signal transmission device
  • ONU Subscriber side optical signal transmission devices
  • the present invention relates to an optical transmission system configured to be able to transmit and receive optical signals having different transmission rates between an OLT and each ONU.
  • an optical transmission system that can share optical signals with transmission speeds of 1 Gbps and 10 Gbps (see, for example, Patent Documents 1 to 3).
  • an optical switch corresponding to optical signals with transmission speeds of 1 Gbps and 10 Gbps and an expensive dual-rate optical signal processor are provided so that optical signals with different transmission speeds can be shared.
  • an expensive CDR Chip Data Recovery
  • optical signals with transmission speeds of 1 Gbps and 10 Gbps are transmitted by a time division multiplexing (TDM) method.
  • TDM time division multiplexing
  • the upstream optical signal are overlapped at a transmission rate of 1 Gbps and a transmission rate of 10 Gbps. Therefore, as in the optical transmission system disclosed in Patent Document 3, it is essential to apply the TDM method, and it is necessary to assign a time slot to the upstream optical line from the ONU. For this reason, there is a problem in that uplink communication with different transmission rates cannot be performed in the same time zone, and the utilization efficiency of the uplink optical line is low.
  • the present invention has been made to solve the above-described problems.
  • the existing OLT can be used without replacement, and the configuration is inexpensive. It is an object of the present invention to provide an optical transmission system that can be used.
  • An optical transmission system includes: a first optical signal transmission device on the subscriber side that performs communication at a first transmission rate between the optical signal transmission device on the side of the building and the optical signal transmission device on the side of the building; A second subscriber-side optical signal transmission device that communicates with the station-side optical signal transmission device at a second transmission rate, and the station-side optical signal transmission device transmits light at a first transmission rate.
  • the optical signal of a different transmission speed when sharing the optical signal of a different transmission speed, it can divert without replacing existing OLT, and it can comprise at low cost. Furthermore, it is possible to apply a wavelength division multiplexing (WDM) system to optical signals having different transmission rates in uplink communication. Therefore, uplink communication with different transmission rates can be performed in the same time zone, and the utilization efficiency of the uplink optical line can be improved. In addition, the number of allocated communication times can be reduced.
  • WDM wavelength division multiplexing
  • FIG. 1 is a diagram showing a configuration of an optical transmission system according to Embodiment 1 of the present invention.
  • the optical transmission system shown in FIG. 1 uses an existing optical signal transmission device (OLT) having an existing optical transceiver (TRx) 107 for a transmission rate of 1 Gbps as it is, and uses an optical signal having a transmission rate of 1 Gbps and a transmission rate of 10 Gbps.
  • OLT optical signal transmission device
  • TRx existing optical transceiver
  • the provided optical transmission system will be described.
  • a station 100 and a plurality of subscriber buildings 110a and 110b are connected to a plurality of optical signal main terminal lines 130 and a plurality of optical fibers 117a and 117b via an optical splitter 120. Connected by.
  • the office building 100 is arranged between an OLT 101 having an optical transceiver 102 for a transmission speed of 10 Gbps and an optical transceiver 107 for a transmission speed of 1 Gbps, an optical splitter 109, an optical splitter 109, and an optical transceiver 107.
  • a rejection filter 106b that totally reflects an optical signal having a wavelength of 1280 nm or less and transmits an optical signal having another wavelength is installed.
  • the optical transmitter / receiver 102 transmits / receives an optical signal to / from the optical transmitter / receiver 112a for the ONU 111a having a transmission rate of 10 Gbps.
  • the optical transceiver 102 includes an optical transmitter (Tx) 103a that transmits an optical signal at a transmission speed of 10 Gbps, an optical receiver (Rx) 104a that receives an optical signal at a transmission speed of 10 Gbps, and an optical signal having a wavelength of 1360 nm or less.
  • a wavelength division multiplexing (WDM) filter 105a that reflects to the rejection filter 106a and transmits an optical signal of another wavelength, and a rejection that totally reflects an optical signal having a wavelength greater than 1280 nm and transmits an optical signal of another wavelength And a filter 106a.
  • WDM wavelength division multiplexing
  • the optical transmitter / receiver 107 transmits / receives an optical signal to / from the optical transmitter / receiver 112b for a transmission rate of 1 Gbps of the ONU 111b.
  • the optical transceiver 107 includes an optical transmitter 103b that transmits an optical signal at a transmission speed of 1 Gbps, an optical receiver 104b that receives an optical signal at a transmission speed of 1 Gbps, and an optical signal having a wavelength of 1360 nm or less to the optical receiver 104b side.
  • the WDM filter 105b reflects and transmits optical signals of other wavelengths.
  • Each part in the station building 100 is connected by optical fibers 108a to 108h.
  • an ONU 111a having an optical transceiver 112a for a transmission rate of 10 Gbps and a rejection filter 116a that totally reflects an optical signal having a wavelength of 1480 to 1500 nm and transmits an optical signal having another wavelength are installed. ing.
  • the optical transceiver 112 a transmits and receives optical signals to and from the optical transceiver 102 for the transmission rate of 10 Gbps of the OLT 101.
  • the optical transceiver 112a includes an optical transmitter 113a that transmits an optical signal at a transmission speed of 10 Gbps, an optical receiver 114a that receives an optical signal at a transmission speed of 10 Gbps, and an optical signal having a wavelength of 1575 nm or more to the optical receiver 114a side.
  • the WDM filter 115a reflects and transmits optical signals of other wavelengths.
  • each part in the subscriber building 110a is connected by the optical fibers 117c and 117d.
  • the subscriber building 110b includes an ONU 111b having an optical transceiver 112b for a transmission rate of 1 Gbps, a rejection filter 116b that totally reflects an optical signal having a wavelength of 1575 to 1580 nm and transmits an optical signal having another wavelength. Is installed.
  • the optical transceiver 112b transmits and receives an optical signal to and from the optical transceiver 107 for the transmission rate of 1 Gbps of the OLT 101.
  • the optical transceiver 112b includes an optical transmitter 113b that transmits an optical signal at a transmission speed of 1 Gbps, an optical receiver 114b that receives an optical signal at a transmission speed of 1 Gbps, and an optical signal having a wavelength of 1480 nm or more on the optical receiver 114b side.
  • the WDM filter 115b reflects and transmits optical signals of other wavelengths.
  • each part in the subscriber building 110b is connected by optical fibers 117e and 117f.
  • FIG. 2 is a chart showing the wavelength band of an optical signal used in the optical transmission system according to Embodiment 1 of the present invention.
  • the optical transmitter 103a for a transmission rate of 10 Gbps has a wavelength band of 1575 to 1580 nm. Used to transmit an optical signal to the optical receiver 114a.
  • the optical transmitter 103b for a transmission rate of 1 Gbps transmits an optical signal to the optical receiver 114b using a band with a wavelength of 1480 to 1500 nm.
  • the optical transmitter 113a for a transmission rate of 10 Gbps uses the band of wavelengths 1260 to 1280 nm to the optical receiver 104a. Transmit optical signals. Further, the optical transmitter 113b for a transmission rate of 1 Gbps transmits an optical signal to the optical receiver 104b using a band of wavelengths from 1285 to 1360 nm as an actual value.
  • the wavelength band of the transmission rate of 1 Gbps in uplink communication is set to 1260 to 1360 nm in the standard value.
  • the wavelength of the transmission rate of 1 Gbps is set centering on the wavelength of 1310 nm having the smallest dispersion, and the actual value is the wavelength of 1285 to 1360 nm. Therefore, a guard band is secured between the 10 Gbps wavelength band (1260 to 1280 nm), and the 1 Gbps wavelength (effective value) and the 10 Gbps wavelength do not overlap.
  • FIG. 4 is a flowchart showing downlink communication of the optical transmission system according to Embodiment 1 of the present invention.
  • an optical signal with a transmission rate of 10 Gbps is output from the optical transmitter 103a and an optical signal with a transmission rate of 1 Gbps is simultaneously output from the optical transmitter 103b and transmitted to the ONUs 111a and 111b.
  • the optical transmitter 103a In downlink communication of this optical transmission system, as shown in FIG. 4, first, the optical transmitter 103a outputs an optical signal at a transmission rate of 10 Gbps, and the optical transmitter 103b outputs an optical signal at a transmission rate of 1 Gbps (step ST41). ).
  • the optical transmitter 103a outputs an optical signal at a transmission rate of 10 Gbps using a band of wavelengths 1575 to 1580 nm.
  • the optical signal output from the optical transmitter 103a is transmitted through the WDM filter 105a to the optical splitter 109.
  • the optical transmitter 103b outputs an optical signal at a transmission rate of 1 Gbps using a wavelength band of 1480 to 1500 nm.
  • the optical signal output by the optical transmitter 103b passes through the WDM filter 105b and the rejection filter 106b and is transmitted to the optical splitter 109.
  • the optical splitter 109 multiplexes the optical signal with the transmission rate of 10 Gbps and the optical signal with the transmission rate of 1 Gbps (step ST42).
  • the optical signal combined by the optical splitter 109 is branched into four optical signal main terminal lines 130 and transmitted to the optical splitter 120. Thereafter, the optical signal is branched into eight by the optical splitter 120 and transmitted to the ONUs 111a and 111b.
  • the optical receiver 114a receives an optical signal with a transmission rate of 10 Gbps
  • the optical receiver 114b receives an optical signal with a transmission rate of 1 Gbps (step ST43).
  • step ST43 the optical signal transmitted to the ONU 111a is totally reflected by the rejection filter 116a, and the optical signal with a transmission rate of 1 Gbps with a wavelength of 1480 to 1500 nm is transmitted, and the optical signal with a transmission rate of 10 Gbps with a wavelength of 1575 to 1580 nm is transmitted.
  • an optical signal having a transmission rate of 10 Gbps is reflected by the WDM filter 115a and transmitted to the optical receiver 114a.
  • the optical signal transmitted to the ONU 111b is totally reflected by the rejection filter 116b, and the optical signal with a transmission speed of 10 Gbps with a wavelength of 1575 to 1580 nm is transmitted, and the optical signal with a transmission speed of 1 Gbps with a wavelength of 1480 to 1500 nm is transmitted. Thereafter, an optical signal with a transmission rate of 1 Gbps is reflected by the WDM filter 115b and transmitted to the optical receiver 114b.
  • FIG. 5 is a flowchart showing uplink communication of the optical transmission system according to Embodiment 1 of the present invention.
  • an optical signal having a transmission rate of 10 Gbps is output from the optical transmitter 113a and an optical signal having a transmission rate of 1 Gbps is simultaneously output from the optical transmitter 113b and transmitted to the OLT 101.
  • the optical transmitter 113a outputs an optical signal at a transmission rate of 10 Gbps, and the optical transmitter 113b outputs an optical signal at a transmission rate of 1 Gbps (step ST51). ).
  • the optical transmitter 113a outputs an optical signal at a transmission rate of 10 Gbps using a band of wavelengths 1260 to 1280 nm.
  • the optical signal output by the optical transmitter 113a passes through the WDM filter 115a and the rejection filter 116a and is transmitted to the optical splitter 120.
  • the optical transmitter 113b outputs an optical signal at a transmission rate of 1 Gbps using a band of wavelengths 1285 to 1360 nm as an actual value.
  • the optical signal output by the optical transmitter 113b passes through the WDM filter 115b and the rejection filter 116b and is transmitted to the optical splitter 120.
  • the optical splitter 120 combines the optical signal with the transmission speed of 10 Gbps and the optical signal with the transmission speed of 1 Gbps (step ST52).
  • the optical signal combined by the optical splitter 120 is transmitted to the optical splitter 109 via the optical signal main terminal line 130. Thereafter, the optical signal is branched into two by the optical splitter 109 and transmitted to the optical transceiver 102 and the rejection filter 106b of the OLT 101.
  • the optical receiver 104a receives an optical signal with a transmission rate of 10 Gbps
  • the optical receiver 104b receives an optical signal with a transmission rate of 1 Gbps
  • step ST53 the optical signal transmitted to the optical transceiver 102 is reflected by the WDM filter 105a and transmitted to the rejection filter 106a. Thereafter, among the optical signals transmitted to the rejection filter 106a, an optical signal having a wavelength of 1285 nm to 1360 nm is totally reflected, and an optical signal having a wavelength of 1260 to 1280 nm is transmitted through an optical receiver. Up to 104a.
  • an optical signal with a transmission speed of 10 Gbps with a wavelength of 1260 to 1280 nm is totally reflected, and an optical signal with a transmission speed of 1 Gbps with a wavelength of 1285 to 1360 nm is transmitted. Thereafter, an optical signal with a transmission rate of 1 Gbps is reflected by the WDM filter 105b and transmitted to the optical receiver 104b.
  • wavelength bands of different transmission speeds in uplink communication overlap each other, so that transmission is performed by the TDM method as shown in FIG. For this reason, optical signals having different transmission rates cannot be transmitted in the same time zone, and the utilization efficiency of the upstream optical line is low.
  • FIG. As shown in FIG. 2, it is possible to apply the WDM filter method. Therefore, optical signals with different transmission rates can be transmitted in the same time zone, and the utilization efficiency of the upstream optical line can be improved.
  • 6 and 7 show a case where optical signals (data) are transmitted and received between the OLT 101 and the ONUs 1 to 4 for the transmission rate of 10 Gbps and the ONUs 5 to 8 for the transmission rate of 1 Gbps.
  • different wavelength bands are assigned to different transmission rates (1 Gbps and 10 Gbps), and transmission of wavelengths 1260 to 1280 nm is performed before the optical transceiver 107 for the transmission rate of 1 Gbps. Since the rejection filter 106a that totally reflects an optical signal having a speed of 10 Gbps is provided, when an optical signal having a different transmission speed is shared, the existing OLT for a transmission speed of 1 Gbps can be used as it is. Further, unlike the conventional optical transmission system, an expensive dual-rate optical signal processor and an expensive CDR corresponding to different transmission rates are unnecessary, and the optical transmission system can be configured at low cost.
  • the WDM filter method since it is possible to apply the WDM filter method to different transmission rates in uplink communication, it is possible to perform communication at different transmission rates in the same time zone, and improve the utilization efficiency of the uplink optical line. it can. In addition, the number of allocated communication times can be reduced.
  • FIG. 8 is a block diagram showing a configuration of an optical transmission system according to Embodiment 2 of the present invention.
  • the optical transmission system according to the second embodiment shown in FIG. 8 is obtained by changing the station building 100 in the first embodiment shown in FIG. Other configurations are the same, and the same reference numerals are given and the description thereof is omitted.
  • an OLT 201 having an optical transceiver 202 for transmission speeds of 10 Gbps and 1 Gbps, and an optical splitter 209 are installed.
  • the optical transceiver 202 transmits / receives an optical signal to / from the optical transceiver 112a for a transmission speed of 10 Gbps or the optical transceiver 112b for a transmission speed of 1 Gbps.
  • the optical transceiver 202 includes an optical transmitter 203a that transmits an optical signal at a transmission rate of 10 Gbps, an optical transmitter 203b that transmits an optical signal at a transmission rate of 1 Gbps, and an optical receiver 204a that receives an optical signal at a transmission rate of 10 Gbps.
  • An optical receiver 204b that receives an optical signal with a transmission rate of 1 Gbps, a WDM filter 205a that reflects an optical signal with a wavelength of 1575 nm or more toward the WDM filter 205b, and transmits an optical signal with another wavelength, and a wavelength of 1360 nm or less.
  • a WDM filter 205b that reflects an optical signal to the WDM filter 205c side and transmits an optical signal of another wavelength
  • a WDM filter 205c that reflects a wavelength of 1280 nm or less to the optical receiver 204a and transmits an optical signal of another wavelength. It consists of and.
  • Each part in the office building 200 is connected by optical fibers 208a to 208g.
  • the optical transmitter 203a for a transmission rate of 10 Gbps uses a band of wavelengths 1575 to 1580 nm.
  • An optical signal is transmitted to the optical receiver 114a.
  • the optical transmitter 203b for a transmission rate of 1 Gbps transmits an optical signal to the optical receiver 114b using a band with a wavelength of 1480 to 1500 nm.
  • the operation process of the optical transmission system according to the second embodiment is the same as the operation process of the optical transmission system according to the first embodiment shown in FIGS. 4 and 5, and will be described with reference to FIGS. Do.
  • the case of performing downlink communication will be described with reference to FIG.
  • a case will be described in which an optical signal having a transmission rate of 10 Gbps is output from the optical transmitter 203a, and an optical signal having a transmission rate of 1 Gbps is simultaneously output from the optical transmitter 203b and transmitted to the ONUs 111a and 111b.
  • the operations of the ONUs 111a and 111b according to Embodiment 2 are the same as the operations of the ONUs 111a and 111b according to Embodiment 1 shown in FIG.
  • the optical transmitter 203a In downlink communication of this optical transmission system, as shown in FIG. 4, first, the optical transmitter 203a outputs an optical signal at a transmission rate of 10 Gbps, and the optical transmitter 203b outputs an optical signal at a transmission rate of 1 Gbps (step ST41). ).
  • the optical transmitter 203a outputs an optical signal at a transmission rate of 10 Gbps using a band of wavelengths 1575 to 1580nm.
  • the optical signal output by the optical transmitter 203a is transmitted to the WDM filter 205a.
  • the optical transmitter 203b outputs an optical signal at a transmission rate of 1 Gbps using a wavelength band of 1480 to 1500 nm.
  • the optical signal output by the optical transmitter 203b is transmitted to the WDM filter 205a.
  • the WDM filter 205a combines an optical signal with a transmission rate of 10 Gbps and an optical signal with a transmission rate of 1 Gbps (step ST42).
  • the WDM filter 205a performs multiplexing by reflecting the optical signal from the optical transmitter 203a and transmitting the optical signal from the optical transmitter 203b.
  • the optical signal combined by the WDM filter 205a passes through the WDM filter 205b and is transmitted to the optical splitter 209. Thereafter, the optical signal transmitted to the optical splitter 209 is branched into four optical signal main terminal lines 130 and transmitted to the optical splitter 120. Thereafter, the optical signal is branched into eight by the optical splitter 120 and transmitted to the ONUs 111a and 111b.
  • step ST52 the optical signal combined by the optical splitter 120 is transmitted to the WDM filter 205b via the optical splitter 209.
  • the optical receiver 204a receives an optical signal with a transmission rate of 10 Gbps
  • the optical receiver 204b receives an optical signal with a transmission rate of 1 Gbps
  • step ST53 the optical signal transmitted to the WDM filter 205b is reflected and transmitted to the WDM filter 205c.
  • an optical signal having a wavelength of 1260 to 1280 nm and a transmission rate of 10 Gbps is reflected and transmitted to the optical receiver 204a.
  • an optical signal having a wavelength of 1285 to 1360 nm and a transmission rate of 1 Gbps is transmitted and transmitted to the optical receiver 204b.
  • the optical transceiver for the transmission rate of 10 Gbps (the optical transmitter 203a and the optical receiver 204a) and the optical transceiver for the transmission rate of 1 Gbps (the optical transmitter 203b and the optical receiver).
  • the size of the optical transmission system can be reduced.
  • FIG. 9 is a block diagram showing a configuration of an optical transmission system according to Embodiment 3 of the present invention.
  • the optical transmission system according to the third embodiment shown in FIG. 9 is obtained by changing the station building 100 in the first embodiment shown in FIG.
  • Other configurations are the same, and the same reference numerals are given and the description thereof is omitted.
  • the office building 300 is provided with an OLT 301 having an optical transceiver 302 for transmission speeds of 10 Gbps and 1 Gbps, and an optical splitter 309.
  • the optical transceiver 302 transmits / receives an optical signal to / from the optical transceiver 112a for a transmission speed of 10 Gbps or the optical transceiver 112b for a transmission speed of 1 Gbps.
  • the optical transceiver 302 includes an optical transmitter 303a that transmits an optical signal at a transmission rate of 10 Gbps, an optical transmitter 303b that transmits an optical signal at a transmission rate of 1 Gbps, and an optical receiver 304a that receives an optical signal at a transmission rate of 10 Gbps.
  • An optical receiver 304b that receives an optical signal with a transmission rate of 1 Gbps, a WDM filter 305a that reflects an optical signal with a wavelength of less than 1575 nm toward the WDM filter 305b, and transmits an optical signal with another wavelength, and a wavelength of 1360 nm or less.
  • a WDM filter 305b that reflects an optical signal to the optical receiver 304b side and transmits an optical signal of another wavelength, an optical signal having a wavelength of 1280 nm or less is reflected to the optical receiver 304a, and an optical signal of another wavelength is transmitted.
  • a WDM filter 305c Each part in the station 300 is connected by optical fibers 308a to 308g.
  • the optical transmitter 303a for a transmission rate of 10 Gbps uses a band of wavelengths 1575 to 1580 nm.
  • An optical signal is transmitted to the optical receiver 114a.
  • the optical transmitter 303b for a transmission rate of 1 Gbps transmits an optical signal to the optical receiver 114b using a band with a wavelength of 1480 to 1500 nm.
  • the operation process of the optical transmission system according to the third embodiment is the same as the operation process of the optical transmission system according to the first embodiment shown in FIGS. 4 and 5, and will be described with reference to FIGS. Do.
  • the case of performing downlink communication will be described with reference to FIG.
  • a case will be described in which an optical signal having a transmission rate of 10 Gbps is output from the optical transmitter 303a and an optical signal having a transmission rate of 1 Gbps is output from the optical transmitter 303b and transmitted to the ONUs 111a and 111b.
  • the operations of the ONUs 111a and 111b according to Embodiment 3 are the same as the operations of the ONUs 111a and 111b according to Embodiment 1 shown in FIG.
  • the optical transmitter 303a In downlink communication of this optical transmission system, as shown in FIG. 4, first, the optical transmitter 303a outputs an optical signal at a transmission rate of 10 Gbps, and the optical transmitter 303b outputs an optical signal at a transmission rate of 1 Gbps (step ST41). ).
  • the optical transmitter 303a outputs an optical signal at a transmission rate of 10 Gbps using a band of wavelengths 1575 to 1580nm.
  • the optical signal output from the optical transmitter 303a is transmitted to the WDM filter 305a.
  • the optical transmitter 303b outputs an optical signal at a transmission rate of 1 Gbps using a wavelength band of 1480 to 1500 nm.
  • the optical signal output by the optical transmitter 303b is transmitted to the WDM filter 305a.
  • the WDM filter 305a combines an optical signal with a transmission rate of 10 Gbps and an optical signal with a transmission rate of 1 Gbps (step ST42).
  • the WDM filter 305a performs multiplexing by transmitting the optical signal from the optical transmitter 303a and reflecting the optical signal from the optical transmitter 303b.
  • the optical signal combined by the WDM filter 305 a passes through the WDM filters 305 b and 305 c and is transmitted to the optical splitter 309. Thereafter, the optical signal transmitted to the optical splitter 309 is branched into four optical signal main terminal lines 130 and transmitted to the optical splitter 120. Thereafter, the optical signal is branched into eight by the optical splitter 120 and transmitted to the ONUs 111a and 111b.
  • step ST52 the optical signal combined by the optical splitter 120 is transmitted to the WDM filter 305c via the optical splitter 309.
  • the optical receiver 304a receives an optical signal with a transmission rate of 10 Gbps
  • the optical receiver 304b receives an optical signal with a transmission rate of 1 Gbps (step ST53).
  • step ST53 among the optical signals transmitted to the WDM filter 305c, an optical signal having a wavelength of 1260 to 1280 nm and a transmission rate of 10 Gbps is reflected and transmitted to the optical receiver 304a.
  • an optical signal having a wavelength of 1285 to 1360 nm and a transmission rate of 1 Gbps is transmitted and transmitted to the WDM filter 305b.
  • an optical signal with a transmission rate of 1 Gbps is reflected by the WDM filter 305b and transmitted to the optical receiver 304b.
  • the WDM filters 305a to 305c are arranged on a straight line, in addition to the effects of the first embodiment, not only a simple combination of components, It is possible to apply already assembled modules, including triplexer modules that incorporate two WDM filters and enable three-wavelength division multiplex communication, and expand the range of component and module selection. Can do.
  • FIG. 10 is a block diagram showing a configuration of an optical transmission system according to Embodiment 4 of the present invention.
  • the optical transmission system according to the fourth embodiment shown in FIG. 10 is obtained by changing the station building 100 in the first embodiment shown in FIG. 1 to the station building 400 and changing the subscriber building 110b to the subscriber building 210b. .
  • Other configurations are the same, and the same reference numerals are given and the description thereof is omitted.
  • the office 400 is provided with an OLT 401 having an optical transceiver 402 for transmission speeds of 10 Gbps and 40 Gbps, and an optical splitter 409.
  • the optical transmitter / receiver 402 transmits / receives an optical signal to / from the optical transmitter / receiver 112a for a transmission rate of 10 Gbps or the optical transmitter / receiver 212b for a transmission rate of 40 Gbps.
  • the optical transceiver 402 includes an optical transmitter 403a that transmits an optical signal at a transmission rate of 10 Gbps, an optical transmitter 403b that transmits an optical signal at a transmission rate of 40 Gbps, and an optical receiver 404a that receives an optical signal at a transmission rate of 10 Gbps.
  • An optical receiver 404b that receives an optical signal with a transmission rate of 40 Gbps, a WDM filter 405a that reflects an optical signal with a wavelength of less than 1575 nm toward the WDM filter 405b, and transmits an optical signal with another wavelength, and a wavelength of 1360 nm or less.
  • a WDM filter 405b that reflects an optical signal to the optical receiver 404b side and transmits an optical signal of another wavelength, and an optical signal having a wavelength of 1280 nm or less is reflected to the optical receiver 404a and transmits an optical signal of another wavelength.
  • a WDM filter 405c Each part in the station 400 is connected by optical fibers 408a to 408g.
  • the subscriber building 210b is provided with an ONU 211b having an optical transceiver 212b for a transmission rate of 40 Gbps, and a rejection filter 216b that totally reflects an optical signal with a wavelength of 1575 to 1580 nm and transmits an optical signal with another wavelength. ing.
  • the optical transceiver 212b transmits and receives optical signals to and from the optical transceiver (optical transmitter 403b and optical receiver 404b) for the transmission rate of 40 Gbps of the OLT 401.
  • This optical transceiver 212b includes an optical transmitter 213b that transmits an optical signal at a transmission speed of 40 Gbps, an optical receiver 214b that receives an optical signal at a transmission speed of 40 Gbps, and an optical signal having a wavelength of 1480 nm or more to the optical receiver 214b side.
  • the WDM filter 215b reflects and transmits optical signals of other wavelengths.
  • Each part in the subscriber building 210b is connected by optical fibers 217e and 217f.
  • the optical transmitter 403a for a transmission rate of 10 Gbps uses a band of wavelengths 1575 to 1580 nm.
  • An optical signal is transmitted to the optical receiver 114a.
  • the optical transmitter 403b for a transmission rate of 1 Gbps transmits an optical signal to the optical receiver 214b using a band with a wavelength of 1480 to 1500 nm.
  • the optical transmitter 113a for a transmission rate of 10 Gbps transmits an optical signal to the optical receiver 404a using a band of wavelengths 1260 to 1280 nm.
  • the optical transmitter 213b for the transmission rate of 40 Gbps transmits the optical signal to the optical receiver 404b using the wavelength band (1285-1360 nm) corresponding to the transmission rate of 1 Gbps in the first embodiment.
  • the operation of the optical transmission system configured as described above is the same as the operation of the optical transmission system according to the third embodiment, and a description thereof is omitted.
  • the existing OLT for the transmission rate of 10 Gbps is used as it is. can do. In this way, it is possible to realize optical transmission systems having different transmission speeds with a single OLT without depending on the transmission speed.
  • FIG. 11 is a block diagram showing a configuration of an optical transmission system according to Embodiment 5 of the present invention.
  • the optical transmission system according to the fifth embodiment shown in FIG. 11 is obtained by changing the station building 100 in the first embodiment shown in FIG.
  • Other configurations are the same, and the same reference numerals are given and the description thereof is omitted.
  • an OLT 501 having an optical transceiver 502 for a transmission rate of 10 Gbps and an optical transceiver 507 for a transmission rate of 1 Gbps, an optical splitter 509, an optical splitter 509, and an optical transceiver 507 are arranged.
  • An FBG 506b that reflects an optical signal with a wavelength of 1260 to 1280 nm and transmits an optical signal with another wavelength is installed.
  • the optical transmitter / receiver 502 transmits / receives an optical signal to / from the optical transmitter / receiver 112a for the ONU 111a having a transmission rate of 10 Gbps.
  • This optical transceiver 502 reflects an optical signal having a wavelength of 1360 nm or less to the FBG 506a side, an optical transmitter 503a that transmits an optical signal at a transmission speed of 10 Gbps, an optical receiver 504a that receives an optical signal at a transmission speed of 10 Gbps, A WDM filter 505a that transmits an optical signal having another wavelength and an FBG 506a that reflects an optical signal having a wavelength larger than 1280 nm and transmits an optical signal having another wavelength are configured.
  • the optical transmitter / receiver 507 transmits / receives an optical signal to / from the optical transmitter / receiver 112b for the transmission speed of 1 Gbps of the ONU 111b.
  • the optical transmitter / receiver 507 includes an optical transmitter 503b that transmits an optical signal at a transmission rate of 1 Gbps, an optical receiver 504b that receives an optical signal at a transmission rate of 1 Gbps, and an optical signal having a wavelength of 1360 nm or less to the optical receiver 504b side.
  • the WDM filter 505b reflects and transmits optical signals of other wavelengths.
  • Each part in the station 500 is connected by optical fibers 508a to 508h.
  • the optical transmitter 503a for a transmission rate of 10 Gbps uses a band of wavelengths 1575 to 1580 nm.
  • An optical signal is transmitted to the optical receiver 114a.
  • the optical transmitter 503b for a transmission rate of 1 Gbps transmits an optical signal to the optical receiver 114b using a band with a wavelength of 1480 to 1500 nm.
  • the operation process of the optical transmission system according to the fifth embodiment is the same as the operation process of the optical transmission system according to the first embodiment shown in FIGS. 4 and 5, and will be described with reference to FIGS. Do.
  • the case of performing downlink communication will be described with reference to FIG.
  • a case will be described in which an optical signal with a transmission rate of 10 Gbps is output from the optical transmitter 503a and an optical signal with a transmission rate of 1 Gbps is simultaneously output from the optical transmitter 503b and transmitted to the ONUs 111a and 111b.
  • the operations of the ONUs 111a and 111b according to Embodiment 5 are the same as the operations of the ONUs 111a and 111b according to Embodiment 1 shown in FIG.
  • the optical transmitter 503a outputs an optical signal at a transmission rate of 10 Gbps, and the optical transmitter 503b outputs an optical signal at a transmission rate of 1 Gbps (step ST41). ).
  • the optical transmitter 503a outputs an optical signal at a transmission rate of 10 Gbps using a band of wavelengths 1575 to 1580nm.
  • the optical signal output by the optical transmitter 503a passes through the WDM filter 505a and is transmitted to the optical splitter 509.
  • the optical transmitter 503b outputs an optical signal at a transmission rate of 1 Gbps using a band with a wavelength of 1480 to 1500 nm.
  • the optical signal output by the optical transmitter 503b passes through the WDM filter 505b and the FBG 506b and is transmitted to the optical splitter 509.
  • the optical splitter 509 multiplexes the optical signal with the transmission rate of 10 Gbps and the optical signal with the transmission rate of 1 Gbps (step ST42).
  • the optical signals combined by the optical splitter 509 are branched into four optical signal main terminal lines 130 and transmitted to the optical splitter 120. Thereafter, the optical signal is branched into eight by the optical splitter 120 and transmitted to the ONUs 111a and 111b.
  • step ST52 the optical signal combined by the optical splitter 120 is branched into two by the optical splitter 509 and transmitted to the optical transceiver 502 and the FBG 506b of the OLT 501. Is done.
  • the optical receiver 504a receives an optical signal with a transmission rate of 10 Gbps
  • the optical receiver 504b receives an optical signal with a transmission rate of 1 Gbps
  • the optical signal transmitted to the optical transceiver 502 is reflected by the WDM filter 505a and transmitted to the FBG 506a.
  • an optical signal with a transmission speed of 1 Gbps with a wavelength of 1285 nm to 1360 nm is reflected, and an optical signal with a transmission speed of 10 Gbps with a wavelength of 1260 to 1280 nm is transmitted and transmitted to the optical receiver 504a.
  • an optical signal with a wavelength of 1260 to 1280 nm and a transmission speed of 10 Gbps is reflected, and an optical signal with a wavelength of 1285 to 1360 nm and a transmission speed of 1 Gbps is transmitted. Thereafter, an optical signal with a transmission rate of 1 Gbps is reflected by the WDM filter 505b and transmitted to the optical receiver 504b.
  • the FBGs 506a and 506b are used instead of the rejection filters 106a and 106b, in addition to the effects of the first embodiment, a filter is not used. Since a fiber can be applied, an optical transmission system can be configured easily.
  • the present invention is not limited to this, and a general optical transmission system is used. It is applicable and can be used for multi-wavelength communication technology. Further, within the scope of the present invention, the embodiments can be appropriately combined, changed, or omitted.
  • the optical transmission system according to the present invention can be used without replacing the existing OLT when sharing optical signals having different transmission speeds and can be configured at low cost. Therefore, it is suitable for use in an optical transmission system configured to be able to transmit and receive optical signals having different transmission speeds between the OLT and each ONU.

Abstract

A station-side optical line terminal (101) is provided with a first optical receiver (104a) for receiving an optical signal having a first transmission speed, and a second optical receiver (104b) for receiving an optical signal having a second transmission speed. A first subscriber-side optical network unit (111a) is provided with an optical transmitter (113a) that transmits an optical signal with the first transmission speed, using a first wavelength band, and a second subscriber-side optical network unit (111b) is provided with an optical transmitter (113b) that transmits an optical signal with the second transmission speed, using a second wavelength band. Filters (106a, 106b) for transmitting the optical signal of the first wavelength band to the first optical receiver (104a), and transmitting the optical signal of the second wavelength band to the second optical receiver (104b), are provided at stages preceding the first optical receiver (104a) and the second optical receiver (104b).

Description

光伝送システムOptical transmission system
　この発明は、局舎側光信号伝送装置（ＯＬＴ：Ｏｐｔｉｃａｌ　Ｌｉｎｅ　Ｔｅｒｍｉｎａｌ）と、複数の加入者側光信号伝送装置（ＯＮＵ：Ｏｐｔｉｃａｌ　Ｎｅｔｗｏｒｋ　Ｕｎｉｔ）とを備えたＧＥ－ＰＯＮ（Ｇｉｇａｂｉｔ　Ｅｔｈｅｒｎｅｔ　Ｐａｓｓｉｖｅ　Ｏｐｔｉｃａｌ　Ｎｅｔｗｏｒｋ）システムなどの光伝送システムにおいて、ＯＬＴと各ＯＮＵとの間で異なる伝送速度の光信号を送受信可能に構成した光伝送システムに関するものである。 The present invention is a GE-PON (Gigabit Ethernet Passive Optical Network) equipped with a central office side optical signal transmission device (OLT: Optical Line Terminal) and a plurality of subscriber side optical signal transmission devices (ONU: Optical Network Unit). In an optical transmission system such as a system, the present invention relates to an optical transmission system configured to be able to transmit and receive optical signals having different transmission rates between an OLT and each ONU.
　従来のＧＥ－ＰＯＮシステムなどの光伝送システムにおいて、既存の伝送速度１Ｇｂｐｓ用の光伝送システムに、伝送速度１０Ｇｂｐｓ用の光伝送システムを追加導入する場合には、伝送速度１Ｇｂｐｓおよび１０Ｇｂｐｓの光信号を共用可能なＯＬＴが必要となる。 In a conventional optical transmission system such as a GE-PON system, when an optical transmission system for a transmission speed of 10 Gbps is additionally introduced into an existing optical transmission system for a transmission speed of 1 Gbps, optical signals with a transmission speed of 1 Gbps and 10 Gbps are transmitted. A shareable OLT is required.
　しかしながら、従来の光伝送システムでは、既存の伝送速度１Ｇｂｐｓ用のＯＬＴをそのまま流用して、伝送速度１Ｇｂｐｓおよび１０Ｇｂｐｓの光信号を共用化させた光伝送システムを構成することはできない。
　その理由は、既存の伝送速度１Ｇｂｐｓ用のＯＬＴをそのまま流用すると、ＯＬＴに搭載されている、１Ｇｂｐｓの光信号と電気信号を変換し送受信を行う光送受信器（ＴＲｘ：Ｔｒａｎｓｃｅｉｖｅｒ）に、伝送速度１Ｇｂｐｓの光信号だけでなく伝送速度１０Ｇｂｐｓの光信号も入力されてしまうからである。
　そこで、既存の伝送速度１Ｇｂｐｓ用のＯＬＴに伝送速度１０Ｇｂｐｓの光信号を入力させないように、新たにＯＬＴを適用させる必要がある。 However, in the conventional optical transmission system, it is not possible to configure an optical transmission system in which the existing OLT for the transmission rate of 1 Gbps is used as it is and the optical signals of the transmission rates of 1 Gbps and 10 Gbps are shared.
The reason for this is that if an existing OLT for a transmission rate of 1 Gbps is used as it is, the transmission rate of 1 Gbps is transmitted to an optical transceiver (TRx: Transceiver) mounted on the OLT for converting and transmitting 1 Gbps optical signals and electrical signals. This is because an optical signal having a transmission rate of 10 Gbps is input as well as the above optical signal.
Therefore, it is necessary to newly apply an OLT so that an optical signal having a transmission rate of 10 Gbps is not input to an existing OLT for a transmission rate of 1 Gbps.
　これに対して、伝送速度１Ｇｂｐｓおよび１０Ｇｂｐｓの光信号を共用可能とした光伝送システムが存在している（例えば特許文献１～３参照）。
　特許文献１に開示される光伝送システムでは、伝送速度１Ｇｂｐｓおよび１０Ｇｂｐｓの光信号に対応した光スイッチおよび高価なデュアルレート光信号処理器を設けて、異なる伝送速度の光信号を共用可能としている。
　また、特許文献２に開示される光伝送システムでは、伝送速度１Ｇｂｐｓおよび１０Ｇｂｐｓに対応した高価なＣＤＲ（Ｃｌｏｃｋ　Ｄａｔａ　Ｒｅｃｏｖｅｒｙ）を設けて、異なる伝送速度の光信号を共用可能としている。
　また、特許文献３に開示される光伝送システムでは、伝送速度１Ｇｂｐｓおよび１０Ｇｂｐｓの光信号を時分割多重（ＴＤＭ：Ｔｉｍｅ　Ｄｉｖｉｓｉｏｎ　Ｍｕｌｔｉｐｌｅｘｉｎｇ）方式で送信している。 On the other hand, there is an optical transmission system that can share optical signals with transmission speeds of 1 Gbps and 10 Gbps (see, for example, Patent Documents 1 to 3).
In the optical transmission system disclosed in Patent Document 1, an optical switch corresponding to optical signals with transmission speeds of 1 Gbps and 10 Gbps and an expensive dual-rate optical signal processor are provided so that optical signals with different transmission speeds can be shared.
In the optical transmission system disclosed in Patent Document 2, an expensive CDR (Clock Data Recovery) corresponding to transmission speeds of 1 Gbps and 10 Gbps is provided so that optical signals of different transmission speeds can be shared.
Further, in the optical transmission system disclosed in Patent Document 3, optical signals with transmission speeds of 1 Gbps and 10 Gbps are transmitted by a time division multiplexing (TDM) method.
特開２００９－１９４８２１号公報JP 2009-194421A 特開２００９－７７３２３号公報JP 2009-77323 A 国際公開第２００７／０２６７４９号公報International Publication No. 2007/026749
　上記のように、従来の光伝送システムでは、既存の伝送速度１Ｇｂｐｓ用の光伝送システムに伝送速度１０Ｇｂｐｓ用の光伝送システムを加える場合、伝送速度１Ｇｂｐｓ用のＯＬＴの光送受信器に伝送速度１Ｇｂｐｓの光信号だけでなく伝送速度１０Ｇｂｐｓの光信号も入力されてしまうため、既存の伝送速度１Ｇｂｐｓ用のＯＬＴをそのまま流用することができないという課題があった。 As described above, in the conventional optical transmission system, when an optical transmission system for a transmission speed of 10 Gbps is added to an existing optical transmission system for a transmission speed of 1 Gbps, a transmission speed of 1 Gbps is transmitted to an OLT optical transceiver for the transmission speed of 1 Gbps. Since not only an optical signal but also an optical signal with a transmission rate of 10 Gbps is input, there is a problem that the existing OLT for a transmission rate of 1 Gbps cannot be used as it is.
　また、特許文献１に開示される光伝送システムのように、既存のＯＬＴを流用せずに伝送速度１Ｇｂｐｓおよび１０Ｇｂｐｓ用のＯＬＴを１台で構成した場合には、伝送速度１Ｇｂｐｓおよび１０Ｇｂｐｓに対応した高価なデュアルレート光信号処理器が必要であり、高コストの要因になるという課題があった。
　また、特許文献２に開示される光伝送システムのように、デュアルレート光信号処理器を使用しない場合でも、伝送速度１Ｇｂｐｓおよび１０Ｇｂｐｓに対応した高価なＣＤＲが必要であり、高コストの要因になるという課題があった。 In addition, as in the optical transmission system disclosed in Patent Document 1, when an OLT for a transmission rate of 1 Gbps and 10 Gbps is configured without using an existing OLT, the transmission rate corresponds to 1 Gbps and 10 Gbps. An expensive dual-rate optical signal processor is required, which causes a problem of high cost.
Further, even when a dual-rate optical signal processor is not used as in the optical transmission system disclosed in Patent Document 2, an expensive CDR corresponding to transmission speeds of 1 Gbps and 10 Gbps is necessary, resulting in a high cost factor. There was a problem.
　さらに、既存のＯＬＴを流用せずに特許文献１、２のような高コストで高度な部品を用いて、伝送速度１Ｇｂｐｓおよび１０Ｇｂｐｓの光信号を共用化させた場合であっても、上り光信号の波長が伝送速度１Ｇｂｐｓと伝送速度１０Ｇｂｐｓとでは重なる。そのため、特許文献３に開示される光伝送システムのように、ＴＤＭ方式の適用が必須であり、ＯＮＵからの上り光回線にタイムスロットを割り当てる必要がある。そのため、同じ時間帯で異なる伝送速度の上り通信を行うことができずに、上り光回線の利用効率が低いという課題があった。 Further, even if the optical signals of 1 Gbps and 10 Gbps are shared by using high-cost and advanced components such as Patent Documents 1 and 2 without using the existing OLT, the upstream optical signal Are overlapped at a transmission rate of 1 Gbps and a transmission rate of 10 Gbps. Therefore, as in the optical transmission system disclosed in Patent Document 3, it is essential to apply the TDM method, and it is necessary to assign a time slot to the upstream optical line from the ONU. For this reason, there is a problem in that uplink communication with different transmission rates cannot be performed in the same time zone, and the utilization efficiency of the uplink optical line is low.
　この発明は、上記のような課題を解決するためになされたもので、異なる伝送速度の光信号を共用化する場合に、既存のＯＬＴを置き換えることなく流用することができ、かつ、安価に構成することができる光伝送システムを提供することを目的としている。 The present invention has been made to solve the above-described problems. When optical signals having different transmission speeds are shared, the existing OLT can be used without replacement, and the configuration is inexpensive. It is an object of the present invention to provide an optical transmission system that can be used.
　この発明に係る光伝送システムは、局舎側光信号伝送装置と、局舎側光信号伝送装置との間で第１の伝送速度で通信を行う第１の加入者側光信号伝送装置と、局舎側光信号伝送装置との間で第２の伝送速度で通信を行う第２の加入者側光信号伝送装置とを備え、局舎側光信号伝送装置は、第１の伝送速度の光信号を受信する第１の光受信器と、第２の伝送速度の光信号を受信する第２の光受信器とを備え、第１の加入者側光信号伝送装置は、第１の波長帯を使用して、第１の伝送速度で光信号を送信する光送信器を備え、第２の加入者側光信号伝送装置は、第２の波長帯を使用して、第２の伝送速度で光信号を送信する光送信器を備え、第１の光受信器および第２の光受信器の前段に、第１の波長帯の光信号を第１の光受信器に送信し、第２の波長帯の光信号を第２の光受信器に送信するフィルタを設けたものである。 An optical transmission system according to the present invention includes: a first optical signal transmission device on the subscriber side that performs communication at a first transmission rate between the optical signal transmission device on the side of the building and the optical signal transmission device on the side of the building; A second subscriber-side optical signal transmission device that communicates with the station-side optical signal transmission device at a second transmission rate, and the station-side optical signal transmission device transmits light at a first transmission rate. A first optical receiver for receiving a signal and a second optical receiver for receiving an optical signal having a second transmission rate, wherein the first subscriber-side optical signal transmission apparatus has a first wavelength band; And an optical transmitter for transmitting an optical signal at a first transmission rate, and a second subscriber-side optical signal transmission device using a second wavelength band at a second transmission rate. An optical transmitter for transmitting an optical signal, transmitting an optical signal in the first wavelength band to the first optical receiver before the first optical receiver and the second optical receiver, The optical signal of the wavelength band is provided with a filter to be transmitted to the second optical receiver.
　この発明によれば、上記のように構成したので、異なる伝送速度の光信号を共用化する場合に、既存のＯＬＴを置き換えることなく流用することができ、かつ、安価に構成することができる。
　さらに、上り通信における異なる伝送速度の光信号に対して、波長分割多重（ＷＤＭ：Ｗａｖｅｌｅｎｇｔｈ　Ｄｉｖｉｓｉｏｎ　Ｍｕｌｔｉｐｌｅｘｉｎｇ）方式を適用することが可能である。そのため、同じ時間帯で異なる伝送速度の上り通信を行うことができ、上り光回線の利用効率を向上させることができる。また、通信時間の割り当て数を削減することができる。 According to this invention, since it comprised as mentioned above, when sharing the optical signal of a different transmission speed, it can divert without replacing existing OLT, and it can comprise at low cost.
Furthermore, it is possible to apply a wavelength division multiplexing (WDM) system to optical signals having different transmission rates in uplink communication. Therefore, uplink communication with different transmission rates can be performed in the same time zone, and the utilization efficiency of the uplink optical line can be improved. In addition, the number of allocated communication times can be reduced.
この発明の実施の形態１に係る光伝送システムの構成を示す図である。It is a figure which shows the structure of the optical transmission system which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係る光伝送システムおいて使用する光信号の波長帯を示すチャート図である。It is a chart figure which shows the wavelength band of the optical signal used in the optical transmission system which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係る光伝送システムおいて使用する上り光信号の波長帯を示すチャート図である。It is a chart figure which shows the wavelength band of the upstream optical signal used in the optical transmission system which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係る光伝送システムの下り通信を示すフローチャートである。It is a flowchart which shows the downlink communication of the optical transmission system which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係る光伝送システムの上り通信を示すフローチャートである。It is a flowchart which shows the uplink communication of the optical transmission system which concerns on Embodiment 1 of this invention. 従来の光伝送システムの通信を示すチャート図である。It is a chart figure which shows communication of the conventional optical transmission system. この発明の実施の形態１に係る光伝送システムの通信を示すチャート図である。It is a chart figure which shows communication of the optical transmission system which concerns on Embodiment 1 of this invention. この発明の実施の形態２に係る光伝送システムの構成を示す図である。It is a figure which shows the structure of the optical transmission system which concerns on Embodiment 2 of this invention. この発明の実施の形態３に係る光伝送システムの構成を示す図である。It is a figure which shows the structure of the optical transmission system which concerns on Embodiment 3 of this invention. この発明の実施の形態４に係る光伝送システムの構成を示す図である。It is a figure which shows the structure of the optical transmission system which concerns on Embodiment 4 of this invention. この発明の実施の形態５に係る光伝送システムの構成を示す図である。It is a figure which shows the structure of the optical transmission system which concerns on Embodiment 5 of this invention.
　以下、この発明の実施の形態について図面を参照しながら詳細に説明する。
実施の形態１．
　図１はこの発明の実施の形態１に係る光伝送システムの構成を示す図である。
　図１に示す光伝送システムは、既存の伝送速度１Ｇｂｐｓ用の光送受信器（ＴＲｘ）１０７を有する局舎側光信号伝送装置（ＯＬＴ）をそのまま流用して、伝送速度１Ｇｂｐｓおよび伝送速度１０Ｇｂｐｓの光信号を共用化した光伝送システムを構築したものである。
　なお以下では、１台のＯＬＴ１０１と、ＯＬＴ１０１との間で第１の伝送速度（１０Ｇｂｐｓ）で通信を行うＯＮＵ１１１ａと、ＯＬＴ１０１との間で第２の伝送速度（１Ｇｂｐｓ）で通信を行うＯＮＵ１１１ｂとを備えた光伝送システムについて説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
1 is a diagram showing a configuration of an optical transmission system according to Embodiment 1 of the present invention.
The optical transmission system shown in FIG. 1 uses an existing optical signal transmission device (OLT) having an existing optical transceiver (TRx) 107 for a transmission rate of 1 Gbps as it is, and uses an optical signal having a transmission rate of 1 Gbps and a transmission rate of 10 Gbps. This is an optical transmission system that shares signals.
In the following, one OLT 101 and an ONU 111a that communicates with the OLT 101 at a first transmission rate (10 Gbps) and an ONU 111b that communicates with the OLT 101 at a second transmission rate (1 Gbps). The provided optical transmission system will be described.
　光伝送システムでは、図１に示すように、局舎１００と複数の加入者建物１１０ａ，１１０ｂとが、光スプリッタ１２０を介して、複数の光信号主端末回線１３０と複数の光ファイバ１１７ａ，１１７ｂにより接続されている。 In the optical transmission system, as shown in FIG. 1, a station 100 and a plurality of subscriber buildings 110a and 110b are connected to a plurality of optical signal main terminal lines 130 and a plurality of optical fibers 117a and 117b via an optical splitter 120. Connected by.
　局舎１００には、伝送速度１０Ｇｂｐｓ用の光送受信器１０２および伝送速度１Ｇｂｐｓ用の光送受信器１０７を有するＯＬＴ１０１と、光スプリッタ１０９と、光スプリッタ１０９と光送受信器１０７との間に配置され、波長１２８０ｎｍ以下の光信号を全反射し、その他の波長の光信号を透過するリジェクションフィルタ１０６ｂとが設置されている。 The office building 100 is arranged between an OLT 101 having an optical transceiver 102 for a transmission speed of 10 Gbps and an optical transceiver 107 for a transmission speed of 1 Gbps, an optical splitter 109, an optical splitter 109, and an optical transceiver 107. A rejection filter 106b that totally reflects an optical signal having a wavelength of 1280 nm or less and transmits an optical signal having another wavelength is installed.
　光送受信器１０２は、ＯＮＵ１１１ａの伝送速度１０Ｇｂｐｓ用の光送受信器１１２ａとの間で光信号の送受信を行うものである。この光送受信器１０２は、伝送速度１０Ｇｂｐｓで光信号を送信する光送信器（Ｔｘ）１０３ａと、伝送速度１０Ｇｂｐｓの光信号を受信する光受信器（Ｒｘ）１０４ａと、波長１３６０ｎｍ以下の光信号をリジェクションフィルタ１０６ａ側に反射し、その他の波長の光信号を透過する波長分割多重（ＷＤＭ）フィルタ１０５ａと、波長１２８０ｎｍより大きい光信号を全反射し、その他の波長の光信号を透過するリジェクションフィルタ１０６ａとから構成されている。 The optical transmitter / receiver 102 transmits / receives an optical signal to / from the optical transmitter / receiver 112a for the ONU 111a having a transmission rate of 10 Gbps. The optical transceiver 102 includes an optical transmitter (Tx) 103a that transmits an optical signal at a transmission speed of 10 Gbps, an optical receiver (Rx) 104a that receives an optical signal at a transmission speed of 10 Gbps, and an optical signal having a wavelength of 1360 nm or less. A wavelength division multiplexing (WDM) filter 105a that reflects to the rejection filter 106a and transmits an optical signal of another wavelength, and a rejection that totally reflects an optical signal having a wavelength greater than 1280 nm and transmits an optical signal of another wavelength And a filter 106a.
　光送受信器１０７は、ＯＮＵ１１１ｂの伝送速度１Ｇｂｐｓ用の光送受信器１１２ｂとの間で光信号の送受信を行うものである。この光送受信器１０７は、伝送速度１Ｇｂｐｓで光信号を送信する光送信器１０３ｂと、伝送速度１Ｇｂｐｓの光信号を受信する光受信器１０４ｂと、波長１３６０ｎｍ以下の光信号を光受信器１０４ｂ側に反射し、その他の波長の光信号を透過するＷＤＭフィルタ１０５ｂとから構成されている。
　なお、局舎１００内の各部は、光ファイバ１０８ａ～１０８ｈにより接続されている。 The optical transmitter / receiver 107 transmits / receives an optical signal to / from the optical transmitter / receiver 112b for a transmission rate of 1 Gbps of the ONU 111b. The optical transceiver 107 includes an optical transmitter 103b that transmits an optical signal at a transmission speed of 1 Gbps, an optical receiver 104b that receives an optical signal at a transmission speed of 1 Gbps, and an optical signal having a wavelength of 1360 nm or less to the optical receiver 104b side. The WDM filter 105b reflects and transmits optical signals of other wavelengths.
Each part in the station building 100 is connected by optical fibers 108a to 108h.
　加入者建物１１０ａには、伝送速度１０Ｇｂｐｓ用の光送受信器１１２ａを有するＯＮＵ１１１ａと、波長１４８０～１５００ｎｍの光信号を全反射し、その他の波長の光信号を透過するリジェクションフィルタ１１６ａとが設置されている。 In the subscriber building 110a, an ONU 111a having an optical transceiver 112a for a transmission rate of 10 Gbps and a rejection filter 116a that totally reflects an optical signal having a wavelength of 1480 to 1500 nm and transmits an optical signal having another wavelength are installed. ing.
　光送受信器１１２ａは、ＯＬＴ１０１の伝送速度１０Ｇｂｐｓ用の光送受信器１０２との間で光信号の送受信を行うものである。この光送受信器１１２ａは、伝送速度１０Ｇｂｐｓで光信号を送信する光送信器１１３ａと、伝送速度１０Ｇｂｐｓの光信号を受信する光受信器１１４ａと、波長１５７５ｎｍ以上の光信号を光受信器１１４ａ側に反射し、その他の波長の光信号を透過するＷＤＭフィルタ１１５ａとから構成されている。
　なお、加入者建物１１０ａ内の各部は、光ファイバ１１７ｃ，１１７ｄにより接続されている。 The optical transceiver 112 a transmits and receives optical signals to and from the optical transceiver 102 for the transmission rate of 10 Gbps of the OLT 101. The optical transceiver 112a includes an optical transmitter 113a that transmits an optical signal at a transmission speed of 10 Gbps, an optical receiver 114a that receives an optical signal at a transmission speed of 10 Gbps, and an optical signal having a wavelength of 1575 nm or more to the optical receiver 114a side. The WDM filter 115a reflects and transmits optical signals of other wavelengths.
In addition, each part in the subscriber building 110a is connected by the optical fibers 117c and 117d.
　同様に、加入者建物１１０ｂには、伝送速度１Ｇｂｐｓ用の光送受信器１１２ｂを有するＯＮＵ１１１ｂと、波長１５７５～１５８０ｎｍの光信号を全反射し、その他の波長の光信号を透過するリジェクションフィルタ１１６ｂとが設置されている。 Similarly, the subscriber building 110b includes an ONU 111b having an optical transceiver 112b for a transmission rate of 1 Gbps, a rejection filter 116b that totally reflects an optical signal having a wavelength of 1575 to 1580 nm and transmits an optical signal having another wavelength. Is installed.
　光送受信器１１２ｂは、ＯＬＴ１０１の伝送速度１Ｇｂｐｓ用の光送受信器１０７との間で光信号の送受信を行うものである。この光送受信器１１２ｂは、伝送速度１Ｇｂｐｓで光信号を送信する光送信器１１３ｂと、伝送速度１Ｇｂｐｓの光信号を受信する光受信器１１４ｂと、波長１４８０ｎｍ以上の光信号を光受信器１１４ｂ側に反射し、その他の波長の光信号を透過するＷＤＭフィルタ１１５ｂとから構成されている。
　なお、加入者建物１１０ｂ内の各部は、光ファイバ１１７ｅ，１１７ｆにより接続されている。 The optical transceiver 112b transmits and receives an optical signal to and from the optical transceiver 107 for the transmission rate of 1 Gbps of the OLT 101. The optical transceiver 112b includes an optical transmitter 113b that transmits an optical signal at a transmission speed of 1 Gbps, an optical receiver 114b that receives an optical signal at a transmission speed of 1 Gbps, and an optical signal having a wavelength of 1480 nm or more on the optical receiver 114b side. The WDM filter 115b reflects and transmits optical signals of other wavelengths.
In addition, each part in the subscriber building 110b is connected by optical fibers 117e and 117f.
　次に、上記のように構成された光伝送システムで使用する光信号の波長帯について説明する。
　図２はこの発明の実施の形態１に係る光伝送システムで使用する光信号の波長帯を示すチャート図である。
　光伝送システムにおいて下り通信（ＯＬＴ１０１からＯＮＵ１１１ａ，１１１ｂへの光信号の伝送）を行う場合には、図２に示すように、伝送速度１０Ｇｂｐｓ用の光送信器１０３ａは、波長１５７５～１５８０ｎｍの帯域を使用して光受信器１１４ａに光信号を伝送する。また、伝送速度１Ｇｂｐｓ用の光送信器１０３ｂは、波長１４８０～１５００ｎｍの帯域を使用して光受信器１１４ｂに光信号を伝送する。 Next, the wavelength band of the optical signal used in the optical transmission system configured as described above will be described.
FIG. 2 is a chart showing the wavelength band of an optical signal used in the optical transmission system according to Embodiment 1 of the present invention.
When performing downlink communication (transmission of optical signals from the OLT 101 to the ONUs 111a and 111b) in the optical transmission system, as shown in FIG. 2, the optical transmitter 103a for a transmission rate of 10 Gbps has a wavelength band of 1575 to 1580 nm. Used to transmit an optical signal to the optical receiver 114a. In addition, the optical transmitter 103b for a transmission rate of 1 Gbps transmits an optical signal to the optical receiver 114b using a band with a wavelength of 1480 to 1500 nm.
　同様に、上り通信（ＯＮＵ１１１ａ，１１１ｂからＯＬＴ１０１への光信号の伝送）を行う場合には、伝送速度１０Ｇｂｐｓ用の光送信器１１３ａは、波長１２６０～１２８０ｎｍの帯域を使用して光受信器１０４ａに光信号を伝送する。また、伝送速度１Ｇｂｐｓ用の光送信器１１３ｂは、実力値として波長１２８５～１３６０ｎｍの帯域を使用して光受信器１０４ｂに光信号を伝送する。 Similarly, when performing upstream communication (transmission of optical signals from the ONUs 111a and 111b to the OLT 101), the optical transmitter 113a for a transmission rate of 10 Gbps uses the band of wavelengths 1260 to 1280 nm to the optical receiver 104a. Transmit optical signals. Further, the optical transmitter 113b for a transmission rate of 1 Gbps transmits an optical signal to the optical receiver 104b using a band of wavelengths from 1285 to 1360 nm as an actual value.
　ここで、図３に示すように、上り通信での伝送速度１Ｇｂｐｓの波長帯は、規格値では１２６０～１３６０ｎｍに設定されている。しかしながら、伝送速度１Ｇｂｐｓの波長は、分散が最も小さい波長１３１０ｎｍを中心に設定され、その実力値は波長１２８５～１３６０ｎｍである。そのため、１０Ｇｂｐｓの波長帯（１２６０～１２８０ｎｍ）との間でガードバンドが確保され、１Ｇｂｐｓの波長（実力値）と１０Ｇｂｐｓの波長とは重ならない。 Here, as shown in FIG. 3, the wavelength band of the transmission rate of 1 Gbps in uplink communication is set to 1260 to 1360 nm in the standard value. However, the wavelength of the transmission rate of 1 Gbps is set centering on the wavelength of 1310 nm having the smallest dispersion, and the actual value is the wavelength of 1285 to 1360 nm. Therefore, a guard band is secured between the 10 Gbps wavelength band (1260 to 1280 nm), and the 1 Gbps wavelength (effective value) and the 10 Gbps wavelength do not overlap.
　次に、上記のように構成された光伝送システムの動作について説明する。まず、下り通信を行う場合について説明する。
　図４はこの発明の実施の形態１に係る光伝送システムの下り通信を示すフローチャートである。なお以下では、光送信器１０３ａから伝送速度１０Ｇｂｐｓの光信号を出力し、同時に光送信器１０３ｂから伝送速度１Ｇｂｐｓの光信号を出力して、ＯＮＵ１１１ａ，１１１ｂに伝送する場合について説明する。 Next, the operation of the optical transmission system configured as described above will be described. First, a case where downlink communication is performed will be described.
FIG. 4 is a flowchart showing downlink communication of the optical transmission system according to Embodiment 1 of the present invention. Hereinafter, a case will be described in which an optical signal with a transmission rate of 10 Gbps is output from the optical transmitter 103a and an optical signal with a transmission rate of 1 Gbps is simultaneously output from the optical transmitter 103b and transmitted to the ONUs 111a and 111b.
　この光伝送システムの下り通信では、図４に示すように、まず、光送信器１０３ａは伝送速度１０Ｇｂｐｓで光信号を出力し、光送信器１０３ｂは伝送速度１Ｇｂｐｓで光信号を出力する（ステップＳＴ４１）。
　このステップＳＴ４１において、光送信器１０３ａは、波長１５７５～１５８０ｎｍの帯域を使用して、伝送速度１０Ｇｂｐｓで光信号を出力する。この光送信器１０３ａにより出力された光信号は、ＷＤＭフィルタ１０５ａを透過して、光スプリッタ１０９に伝送される。
　同様に、光送信器１０３ｂは、波長１４８０～１５００ｎｍの帯域を使用して、伝送速度１Ｇｂｐｓで光信号を出力する。この光送信器１０３ｂにより出力された光信号は、ＷＤＭフィルタ１０５ｂおよびリジェクションフィルタ１０６ｂを透過して、光スプリッタ１０９に伝送される。 In downlink communication of this optical transmission system, as shown in FIG. 4, first, the optical transmitter 103a outputs an optical signal at a transmission rate of 10 Gbps, and the optical transmitter 103b outputs an optical signal at a transmission rate of 1 Gbps (step ST41). ).
In step ST41, the optical transmitter 103a outputs an optical signal at a transmission rate of 10 Gbps using a band of wavelengths 1575 to 1580 nm. The optical signal output from the optical transmitter 103a is transmitted through the WDM filter 105a to the optical splitter 109.
Similarly, the optical transmitter 103b outputs an optical signal at a transmission rate of 1 Gbps using a wavelength band of 1480 to 1500 nm. The optical signal output by the optical transmitter 103b passes through the WDM filter 105b and the rejection filter 106b and is transmitted to the optical splitter 109.
　次いで、光スプリッタ１０９は、伝送速度１０Ｇｂｐｓの光信号および伝送速度１Ｇｂｐｓの光信号を合波する（ステップＳＴ４２）。この光スプリッタ１０９により合波された光信号は、各光信号主端末回線１３０に４分岐され、光スプリッタ１２０に伝送される。その後、光信号は、光スプリッタ１２０により８分岐され、ＯＮＵ１１１ａ，１１１ｂに伝送される。 Next, the optical splitter 109 multiplexes the optical signal with the transmission rate of 10 Gbps and the optical signal with the transmission rate of 1 Gbps (step ST42). The optical signal combined by the optical splitter 109 is branched into four optical signal main terminal lines 130 and transmitted to the optical splitter 120. Thereafter, the optical signal is branched into eight by the optical splitter 120 and transmitted to the ONUs 111a and 111b.
　次いで、光受信器１１４ａは伝送速度１０Ｇｂｐｓの光信号を受信し、光受信器１１４ｂは伝送速度１Ｇｂｐｓの光信号を受信する（ステップＳＴ４３）。
　このステップＳＴ４３において、ＯＮＵ１１１ａに伝送された光信号は、リジェクションフィルタ１１６ａにより、波長１４８０～１５００ｎｍの伝送速度１Ｇｂｐｓの光信号は全反射され、波長１５７５～１５８０ｎｍの伝送速度１０Ｇｂｐｓの光信号は透過する。その後、伝送速度１０Ｇｂｐｓの光信号は、ＷＤＭフィルタ１１５ａにより反射され、光受信器１１４ａまで伝送される。
　同様に、ＯＮＵ１１１ｂに伝送された光信号は、リジェクションフィルタ１１６ｂにより、波長１５７５～１５８０ｎｍの伝送速度１０Ｇｂｐｓの光信号は全反射され、波長１４８０～１５００ｎｍの伝送速度１Ｇｂｐｓの光信号は透過する。その後、伝送速度１Ｇｂｐｓの光信号は、ＷＤＭフィルタ１１５ｂにより反射され、光受信器１１４ｂまで伝送される。 Next, the optical receiver 114a receives an optical signal with a transmission rate of 10 Gbps, and the optical receiver 114b receives an optical signal with a transmission rate of 1 Gbps (step ST43).
In step ST43, the optical signal transmitted to the ONU 111a is totally reflected by the rejection filter 116a, and the optical signal with a transmission rate of 1 Gbps with a wavelength of 1480 to 1500 nm is transmitted, and the optical signal with a transmission rate of 10 Gbps with a wavelength of 1575 to 1580 nm is transmitted. . Thereafter, an optical signal having a transmission rate of 10 Gbps is reflected by the WDM filter 115a and transmitted to the optical receiver 114a.
Similarly, the optical signal transmitted to the ONU 111b is totally reflected by the rejection filter 116b, and the optical signal with a transmission speed of 10 Gbps with a wavelength of 1575 to 1580 nm is transmitted, and the optical signal with a transmission speed of 1 Gbps with a wavelength of 1480 to 1500 nm is transmitted. Thereafter, an optical signal with a transmission rate of 1 Gbps is reflected by the WDM filter 115b and transmitted to the optical receiver 114b.
　次に、上り通信を行う場合について説明する。
　図５はこの発明の実施の形態１に係る光伝送システムの上り通信を示すフローチャートである。なお以下では、光送信器１１３ａから伝送速度１０Ｇｂｐｓの光信号を出力し、同時に光送信器１１３ｂから伝送速度１Ｇｂｐｓの光信号を出力して、ＯＬＴ１０１に伝送する場合について説明する。 Next, a case where uplink communication is performed will be described.
FIG. 5 is a flowchart showing uplink communication of the optical transmission system according to Embodiment 1 of the present invention. In the following, a case will be described in which an optical signal having a transmission rate of 10 Gbps is output from the optical transmitter 113a and an optical signal having a transmission rate of 1 Gbps is simultaneously output from the optical transmitter 113b and transmitted to the OLT 101.
　この光伝送システムの上り通信では、図５に示すように、まず、光送信器１１３ａは伝送速度１０Ｇｂｐｓで光信号を出力し、光送信器１１３ｂは伝送速度１Ｇｂｐｓで光信号を出力する（ステップＳＴ５１）。
　このステップＳＴ５１において、光送信器１１３ａは、波長１２６０～１２８０ｎｍの帯域を使用して、伝送速度１０Ｇｂｐｓで光信号を出力する。この光送信器１１３ａにより出力された光信号は、ＷＤＭフィルタ１１５ａおよびリジェクションフィルタ１１６ａを透過して、光スプリッタ１２０に伝送される。
　同様に、光送信器１１３ｂは、実力値として波長１２８５～１３６０ｎｍの帯域を使用して、伝送速度１Ｇｂｐｓで光信号を出力する。この光送信器１１３ｂにより出力された光信号は、ＷＤＭフィルタ１１５ｂおよびリジェクションフィルタ１１６ｂを透過して、光スプリッタ１２０に伝送される。 In uplink communication of this optical transmission system, as shown in FIG. 5, first, the optical transmitter 113a outputs an optical signal at a transmission rate of 10 Gbps, and the optical transmitter 113b outputs an optical signal at a transmission rate of 1 Gbps (step ST51). ).
In step ST51, the optical transmitter 113a outputs an optical signal at a transmission rate of 10 Gbps using a band of wavelengths 1260 to 1280 nm. The optical signal output by the optical transmitter 113a passes through the WDM filter 115a and the rejection filter 116a and is transmitted to the optical splitter 120.
Similarly, the optical transmitter 113b outputs an optical signal at a transmission rate of 1 Gbps using a band of wavelengths 1285 to 1360 nm as an actual value. The optical signal output by the optical transmitter 113b passes through the WDM filter 115b and the rejection filter 116b and is transmitted to the optical splitter 120.
　次いで、光スプリッタ１２０は、伝送速度１０Ｇｂｐｓの光信号および伝送速度１Ｇｂｐｓの光信号を合波する（ステップＳＴ５２）。この光スプリッタ１２０により合波された光信号は、光信号主端末回線１３０を介して光スプリッタ１０９に伝送される。その後、光信号は、光スプリッタ１０９により２分岐され、ＯＬＴ１０１の光送受信器１０２およびリジェクションフィルタ１０６ｂに伝送される。 Next, the optical splitter 120 combines the optical signal with the transmission speed of 10 Gbps and the optical signal with the transmission speed of 1 Gbps (step ST52). The optical signal combined by the optical splitter 120 is transmitted to the optical splitter 109 via the optical signal main terminal line 130. Thereafter, the optical signal is branched into two by the optical splitter 109 and transmitted to the optical transceiver 102 and the rejection filter 106b of the OLT 101.
　次いで、光受信器１０４ａは伝送速度１０Ｇｂｐｓの光信号を受信し、光受信器１０４ｂは伝送速度１Ｇｂｐｓの光信号を受信する（ステップＳＴ５３）。
　このステップＳＴ５３において、光送受信器１０２に伝送された光信号は、ＷＤＭフィルタ１０５ａにより反射され、リジェクションフィルタ１０６ａに伝送される。その後、リジェクションフィルタ１０６ａに伝送された光信号のうち、波長１２８５ｎｍ～１３６０ｎｍの伝送速度１Ｇｂｐｓの光信号は全反射され、波長１２６０～１２８０ｎｍの伝送速度１０Ｇｂｐｓの光信号は透過して、光受信器１０４ａまで伝送される。
　同様に、リジェクションフィルタ１０６ｂに伝送された光信号のうち、波長１２６０～１２８０ｎｍの伝送速度１０Ｇｂｐｓの光信号は全反射され、波長１２８５～１３６０ｎｍの伝送速度１Ｇｂｐｓの光信号は透過する。その後、伝送速度１Ｇｂｐｓの光信号は、ＷＤＭフィルタ１０５ｂにより反射され、光受信器１０４ｂまで伝送される。 Next, the optical receiver 104a receives an optical signal with a transmission rate of 10 Gbps, and the optical receiver 104b receives an optical signal with a transmission rate of 1 Gbps (step ST53).
In step ST53, the optical signal transmitted to the optical transceiver 102 is reflected by the WDM filter 105a and transmitted to the rejection filter 106a. Thereafter, among the optical signals transmitted to the rejection filter 106a, an optical signal having a wavelength of 1285 nm to 1360 nm is totally reflected, and an optical signal having a wavelength of 1260 to 1280 nm is transmitted through an optical receiver. Up to 104a.
Similarly, among the optical signals transmitted to the rejection filter 106b, an optical signal with a transmission speed of 10 Gbps with a wavelength of 1260 to 1280 nm is totally reflected, and an optical signal with a transmission speed of 1 Gbps with a wavelength of 1285 to 1360 nm is transmitted. Thereafter, an optical signal with a transmission rate of 1 Gbps is reflected by the WDM filter 105b and transmitted to the optical receiver 104b.
　ここで、従来の光伝送システムでは、上り通信における異なる伝送速度の波長帯域が重なるため、図６に示すように、ＴＤＭ方式で伝送を行っていた。そのため、同じ時間帯で異なる伝送速度の光信号を伝送することができず、上り光回線の利用効率が低かった。
　しかしながら、この異なる伝送速度の波長帯域は、実力値では重ならないため、実施の形態１に係る光伝送システムのように、所定波長の光信号を全反射するリジェクションフィルタを設けることで、図７に示すように、ＷＤＭフィルタ方式を適用することが可能である。そのため、同じ時間帯で異なる伝送速度の光信号を伝送することができ、上り光回線の利用効率を向上させることができる。
　なお図６，７では、ＯＬＴ１０１と、伝送速度１０Ｇｂｐｓ用のＯＮＵ１～４および伝送速度１Ｇｂｐｓ用のＯＮＵ５～８との間で、光信号（データ）の送受信を行った場合について示している。 Here, in the conventional optical transmission system, wavelength bands of different transmission speeds in uplink communication overlap each other, so that transmission is performed by the TDM method as shown in FIG. For this reason, optical signals having different transmission rates cannot be transmitted in the same time zone, and the utilization efficiency of the upstream optical line is low.
However, since the wavelength bands of the different transmission speeds do not overlap with each other in terms of actual values, by providing a rejection filter that totally reflects an optical signal having a predetermined wavelength as in the optical transmission system according to the first embodiment, FIG. As shown in FIG. 2, it is possible to apply the WDM filter method. Therefore, optical signals with different transmission rates can be transmitted in the same time zone, and the utilization efficiency of the upstream optical line can be improved.
6 and 7 show a case where optical signals (data) are transmitted and received between the OLT 101 and the ONUs 1 to 4 for the transmission rate of 10 Gbps and the ONUs 5 to 8 for the transmission rate of 1 Gbps.
　以上のように、この実施の形態１によれば、異なる伝送速度（１Ｇｂｐｓ，１０Ｇｂｐｓ）に対して異なる波長帯域を割り当て、伝送速度１Ｇｂｐｓ用の光送受信器１０７の前段に、波長１２６０～１２８０ｎｍの伝送速度１０Ｇｂｐｓの光信号を全反射するリジェクションフィルタ１０６ａを設けるように構成したので、異なる伝送速度の光信号を共用化する場合に、既存の伝送速度１Ｇｂｐｓ用のＯＬＴをそのまま流用することができる。
　また、従来の光伝送システムのように、異なる伝送速度に対応する高価なデュアルレート光信号処理器や高価なＣＤＲは不要であり、光伝送システムを安価に構成することができる。 As described above, according to the first embodiment, different wavelength bands are assigned to different transmission rates (1 Gbps and 10 Gbps), and transmission of wavelengths 1260 to 1280 nm is performed before the optical transceiver 107 for the transmission rate of 1 Gbps. Since the rejection filter 106a that totally reflects an optical signal having a speed of 10 Gbps is provided, when an optical signal having a different transmission speed is shared, the existing OLT for a transmission speed of 1 Gbps can be used as it is.
Further, unlike the conventional optical transmission system, an expensive dual-rate optical signal processor and an expensive CDR corresponding to different transmission rates are unnecessary, and the optical transmission system can be configured at low cost.
　さらに、上り通信における異なる伝送速度に対してＷＤＭフィルタ方式を適用することが可能であるため、同じ時間帯で異なる伝送速度の通信を行うことができ、上り光回線の利用効率を向上させることができる。また、通信時間の割り当て数を削減することができる。 Further, since it is possible to apply the WDM filter method to different transmission rates in uplink communication, it is possible to perform communication at different transmission rates in the same time zone, and improve the utilization efficiency of the uplink optical line. it can. In addition, the number of allocated communication times can be reduced.
実施の形態２．
　実施の形態１では、伝送速度１０Ｇｂｐｓ用の光送受信器１０２と伝送速度１Ｇｂｐｓ用の光送受信器１０７とを別に設けた場合について示したが、実施の形態２では、伝送速度１０Ｇｂｐｓ用の光送受信器と伝送速度１Ｇｂｐｓ用の光送受信器とを１台の光送受信器にまとめたものについて示す。
　図８はこの発明の実施の形態２に係る光伝送システムの構成を示すブロック図である。
　図８に示す実施の形態２に係る光伝送システムは、図１に示す実施の形態１における局舎１００を局舎２００に変更したものである。その他の構成は同様であり、同一の符号を付しその説明を省略する。 Embodiment 2. FIG.
In the first embodiment, the case where the optical transceiver 102 for the transmission speed 10 Gbps and the optical transceiver 107 for the transmission speed 1 Gbps are separately provided, but in the second embodiment, the optical transceiver for the transmission speed 10 Gbps is provided. And an optical transmitter / receiver for a transmission rate of 1 Gbps are shown as a single optical transmitter / receiver.
FIG. 8 is a block diagram showing a configuration of an optical transmission system according to Embodiment 2 of the present invention.
The optical transmission system according to the second embodiment shown in FIG. 8 is obtained by changing the station building 100 in the first embodiment shown in FIG. Other configurations are the same, and the same reference numerals are given and the description thereof is omitted.
　局舎２００には、伝送速度１０Ｇｂｐｓおよび１Ｇｂｐｓ用の光送受信器２０２を有するＯＬＴ２０１と、光スプリッタ２０９とが設置されている。 In the office building 200, an OLT 201 having an optical transceiver 202 for transmission speeds of 10 Gbps and 1 Gbps, and an optical splitter 209 are installed.
　光送受信器２０２は、伝送速度１０Ｇｂｐｓ用の光送受信器１１２ａまたは伝送速度１Ｇｂｐｓ用の光送受信器１１２ｂとの間で光信号の送受信を行うものである。この光送受信器２０２は、伝送速度１０Ｇｂｐｓで光信号を送信する光送信器２０３ａと、伝送速度１Ｇｂｐｓで光信号を送信する光送信器２０３ｂと、伝送速度１０Ｇｂｐｓの光信号を受信する光受信器２０４ａと、伝送速度１Ｇｂｐｓの光信号を受信する光受信器２０４ｂと、波長１５７５ｎｍ以上の光信号をＷＤＭフィルタ２０５ｂ側に反射し、その他の波長の光信号を透過するＷＤＭフィルタ２０５ａと、波長１３６０ｎｍ以下の光信号をＷＤＭフィルタ２０５ｃ側に反射し、その他の波長の光信号を透過するＷＤＭフィルタ２０５ｂと、波長１２８０ｎｍ以下を光受信器２０４ａ側に反射し、その他の波長の光信号を透過するＷＤＭフィルタ２０５ｃとから構成されている。
　なお、局舎２００内の各部は、光ファイバ２０８ａ～２０８ｇにより接続されている。 The optical transceiver 202 transmits / receives an optical signal to / from the optical transceiver 112a for a transmission speed of 10 Gbps or the optical transceiver 112b for a transmission speed of 1 Gbps. The optical transceiver 202 includes an optical transmitter 203a that transmits an optical signal at a transmission rate of 10 Gbps, an optical transmitter 203b that transmits an optical signal at a transmission rate of 1 Gbps, and an optical receiver 204a that receives an optical signal at a transmission rate of 10 Gbps. An optical receiver 204b that receives an optical signal with a transmission rate of 1 Gbps, a WDM filter 205a that reflects an optical signal with a wavelength of 1575 nm or more toward the WDM filter 205b, and transmits an optical signal with another wavelength, and a wavelength of 1360 nm or less. A WDM filter 205b that reflects an optical signal to the WDM filter 205c side and transmits an optical signal of another wavelength, and a WDM filter 205c that reflects a wavelength of 1280 nm or less to the optical receiver 204a and transmits an optical signal of another wavelength. It consists of and.
Each part in the office building 200 is connected by optical fibers 208a to 208g.
　また、実施の形態１と同様に、光伝送システムにおいて下り通信を行う場合には、図２に示すように、伝送速度１０Ｇｂｐｓ用の光送信器２０３ａは、波長１５７５～１５８０ｎｍの帯域を使用して光受信器１１４ａに光信号を伝送する。また、伝送速度１Ｇｂｐｓ用の光送信器２０３ｂは、波長１４８０～１５００ｎｍの帯域を使用して光受信器１１４ｂに光信号を伝送する。 Similarly to the first embodiment, when performing downlink communication in an optical transmission system, as shown in FIG. 2, the optical transmitter 203a for a transmission rate of 10 Gbps uses a band of wavelengths 1575 to 1580 nm. An optical signal is transmitted to the optical receiver 114a. The optical transmitter 203b for a transmission rate of 1 Gbps transmits an optical signal to the optical receiver 114b using a band with a wavelength of 1480 to 1500 nm.
　次に、上記のように構成された光伝送システムの動作について説明する。
　ここで、実施の形態２に係る光伝送システムの動作工程は、図４，５に示す実施の形態１に係る光伝送システムの動作工程と同様であり、図４，５を参照しながら説明を行う。
　まず、下り通信を行う場合について図４を参照しながら説明する。
　なお、以下では、光送信器２０３ａから伝送速度１０Ｇｂｐｓの光信号を出力し、同時に光送信器２０３ｂから伝送速度１Ｇｂｐｓの光信号を出力して、ＯＮＵ１１１ａ，１１１ｂに伝送する場合について説明する。また、実施の形態２に係るＯＮＵ１１１ａ，１１１ｂの動作は、図４に示す実施の形態１に係るＯＮＵ１１１ａ，１１１ｂの動作と同様であるため、その説明を省略する。 Next, the operation of the optical transmission system configured as described above will be described.
Here, the operation process of the optical transmission system according to the second embodiment is the same as the operation process of the optical transmission system according to the first embodiment shown in FIGS. 4 and 5, and will be described with reference to FIGS. Do.
First, the case of performing downlink communication will be described with reference to FIG.
In the following, a case will be described in which an optical signal having a transmission rate of 10 Gbps is output from the optical transmitter 203a, and an optical signal having a transmission rate of 1 Gbps is simultaneously output from the optical transmitter 203b and transmitted to the ONUs 111a and 111b. Further, the operations of the ONUs 111a and 111b according to Embodiment 2 are the same as the operations of the ONUs 111a and 111b according to Embodiment 1 shown in FIG.
　この光伝送システムの下り通信では、図４に示すように、まず、光送信器２０３ａは伝送速度１０Ｇｂｐｓで光信号を出力し、光送信器２０３ｂは伝送速度１Ｇｂｐｓで光信号を出力する（ステップＳＴ４１）。
　このステップＳＴ４１において、光送信器２０３ａは、波長１５７５～１５８０ｎｍの帯域を使用して、伝送速度１０Ｇｂｐｓで光信号を出力する。この光送信器２０３ａにより出力された光信号は、ＷＤＭフィルタ２０５ａに伝送される。
　同様に、光送信器２０３ｂは、波長１４８０～１５００ｎｍの帯域を使用して、伝送速度１Ｇｂｐｓで光信号を出力する。この光送信器２０３ｂにより出力された光信号は、ＷＤＭフィルタ２０５ａに伝送される。 In downlink communication of this optical transmission system, as shown in FIG. 4, first, the optical transmitter 203a outputs an optical signal at a transmission rate of 10 Gbps, and the optical transmitter 203b outputs an optical signal at a transmission rate of 1 Gbps (step ST41). ).
In step ST41, the optical transmitter 203a outputs an optical signal at a transmission rate of 10 Gbps using a band of wavelengths 1575 to 1580nm. The optical signal output by the optical transmitter 203a is transmitted to the WDM filter 205a.
Similarly, the optical transmitter 203b outputs an optical signal at a transmission rate of 1 Gbps using a wavelength band of 1480 to 1500 nm. The optical signal output by the optical transmitter 203b is transmitted to the WDM filter 205a.
　次いで、ＷＤＭフィルタ２０５ａは、伝送速度１０Ｇｂｐｓの光信号および伝送速度１Ｇｂｐｓの光信号を合波する（ステップＳＴ４２）。ここで、ＷＤＭフィルタ２０５ａは、光送信器２０３ａからの光信号を反射し、光送信器２０３ｂからの光信号を透過することにより合波を行う。このＷＤＭフィルタ２０５ａにより合波された光信号は、ＷＤＭフィルタ２０５ｂを透過して、光スプリッタ２０９に伝送される。
　その後、光スプリッタ２０９に伝送された光信号は、各光信号主端末回線１３０に４分岐され、光スプリッタ１２０に伝送される。その後、光信号は、光スプリッタ１２０により８分岐され、ＯＮＵ１１１ａ，１１１ｂに伝送される。 Next, the WDM filter 205a combines an optical signal with a transmission rate of 10 Gbps and an optical signal with a transmission rate of 1 Gbps (step ST42). Here, the WDM filter 205a performs multiplexing by reflecting the optical signal from the optical transmitter 203a and transmitting the optical signal from the optical transmitter 203b. The optical signal combined by the WDM filter 205a passes through the WDM filter 205b and is transmitted to the optical splitter 209.
Thereafter, the optical signal transmitted to the optical splitter 209 is branched into four optical signal main terminal lines 130 and transmitted to the optical splitter 120. Thereafter, the optical signal is branched into eight by the optical splitter 120 and transmitted to the ONUs 111a and 111b.
　次に、上り通信を行う場合について図５を参照しながら説明する。
　なお以下では、光送信器１１３ａから伝送速度１０Ｇｂｐｓの光信号を出力し、同時に光送信器１１３ｂから伝送速度１Ｇｂｐｓの光信号を出力して、ＯＬＴ２０１に伝送する場合について説明する。また、実施の形態２に係るＯＮＵ１１１ａ，１１１ｂの動作は、図５に示す実施の形態１に係るＯＮＵ１１１ａ，１１１ｂの動作と同様であるため、その説明を省略する。 Next, a case where uplink communication is performed will be described with reference to FIG.
Hereinafter, a case will be described in which an optical signal having a transmission rate of 10 Gbps is output from the optical transmitter 113a and an optical signal having a transmission rate of 1 Gbps is simultaneously output from the optical transmitter 113b and transmitted to the OLT 201. The operations of the ONUs 111a and 111b according to the second embodiment are the same as the operations of the ONUs 111a and 111b according to the first embodiment shown in FIG.
　この光伝送システムの上り通信では、図５に示すように、ステップＳＴ５２において、光スプリッタ１２０により合波された光信号は、光スプリッタ２０９を介してＷＤＭフィルタ２０５ｂに伝送される。 In the upstream communication of this optical transmission system, as shown in FIG. 5, in step ST52, the optical signal combined by the optical splitter 120 is transmitted to the WDM filter 205b via the optical splitter 209.
　次いで、光受信器２０４ａは伝送速度１０Ｇｂｐｓの光信号を受信し、光受信器２０４ｂは伝送速度１Ｇｂｐｓの光信号を受信する（ステップＳＴ５３）。
　このステップＳＴ５３において、ＷＤＭフィルタ２０５ｂに伝送された光信号は反射され、ＷＤＭフィルタ２０５ｃに伝送される。その後、ＷＤＭフィルタ２０５ｃに伝送された光信号のうち、波長１２６０～１２８０ｎｍの伝送速度１０Ｇｂｐｓの光信号は反射され、光受信器２０４ａまで伝送される。
　一方、ＷＤＭフィルタ２０５ｃに伝送された光信号のうち、波長１２８５～１３６０ｎｍの伝送速度１Ｇｂｐｓの光信号は透過して、光受信器２０４ｂまで伝送される。 Next, the optical receiver 204a receives an optical signal with a transmission rate of 10 Gbps, and the optical receiver 204b receives an optical signal with a transmission rate of 1 Gbps (step ST53).
In step ST53, the optical signal transmitted to the WDM filter 205b is reflected and transmitted to the WDM filter 205c. Thereafter, among the optical signals transmitted to the WDM filter 205c, an optical signal having a wavelength of 1260 to 1280 nm and a transmission rate of 10 Gbps is reflected and transmitted to the optical receiver 204a.
On the other hand, among the optical signals transmitted to the WDM filter 205c, an optical signal having a wavelength of 1285 to 1360 nm and a transmission rate of 1 Gbps is transmitted and transmitted to the optical receiver 204b.
　以上のように、この実施の形態２によれば、伝送速度１０Ｇｂｐｓ用の光送受信器（光送信器２０３ａおよび光受信器２０４ａ）と伝送速度１Ｇｂｐｓ用の光送受信器（光送信器２０３ｂおよび光受信器２０４ｂ）とを１台にまとめるように構成したので、実施の形態１における効果に加えて、光伝送システムのサイズを縮小化させることができる。 As described above, according to the second embodiment, the optical transceiver for the transmission rate of 10 Gbps (the optical transmitter 203a and the optical receiver 204a) and the optical transceiver for the transmission rate of 1 Gbps (the optical transmitter 203b and the optical receiver). In addition to the effects of the first embodiment, the size of the optical transmission system can be reduced.
実施の形態３．
　実施の形態３では、ＷＤＭフィルタを直線上に配置したものについて示す。
　図９はこの発明の実施の形態３に係る光伝送システムの構成を示すブロック図である。
　図９に示す実施の形態３に係る光伝送システムは、図１に示す実施の形態１における局舎１００を局舎３００に変更したものである。その他の構成は同様であり、同一の符号を付しその説明を省略する。 Embodiment 3 FIG.
In the third embodiment, the WDM filter is arranged on a straight line.
FIG. 9 is a block diagram showing a configuration of an optical transmission system according to Embodiment 3 of the present invention.
The optical transmission system according to the third embodiment shown in FIG. 9 is obtained by changing the station building 100 in the first embodiment shown in FIG. Other configurations are the same, and the same reference numerals are given and the description thereof is omitted.
　局舎３００には、伝送速度１０Ｇｂｐｓおよび１Ｇｂｐｓ用の光送受信器３０２を有するＯＬＴ３０１と、光スプリッタ３０９とが設置されている。 The office building 300 is provided with an OLT 301 having an optical transceiver 302 for transmission speeds of 10 Gbps and 1 Gbps, and an optical splitter 309.
　光送受信器３０２は、伝送速度１０Ｇｂｐｓ用の光送受信器１１２ａまたは伝送速度１Ｇｂｐｓ用の光送受信器１１２ｂとの間で光信号の送受信を行うものである。この光送受信器３０２は、伝送速度１０Ｇｂｐｓで光信号を送信する光送信器３０３ａと、伝送速度１Ｇｂｐｓで光信号を送信する光送信器３０３ｂと、伝送速度１０Ｇｂｐｓの光信号を受信する光受信器３０４ａと、伝送速度１Ｇｂｐｓの光信号を受信する光受信器３０４ｂと、波長１５７５ｎｍ未満の光信号をＷＤＭフィルタ３０５ｂ側に反射し、その他の波長の光信号を透過するＷＤＭフィルタ３０５ａと、波長１３６０ｎｍ以下の光信号を光受信器３０４ｂ側に反射し、その他の波長の光信号を透過するＷＤＭフィルタ３０５ｂと、波長１２８０ｎｍ以下の光信号を光受信器３０４ａに反射し、その他の波長の光信号を透過するＷＤＭフィルタ３０５ｃとから構成されている。
　なお、局舎３００内の各部は、光ファイバ３０８ａ～３０８ｇにより接続されている。 The optical transceiver 302 transmits / receives an optical signal to / from the optical transceiver 112a for a transmission speed of 10 Gbps or the optical transceiver 112b for a transmission speed of 1 Gbps. The optical transceiver 302 includes an optical transmitter 303a that transmits an optical signal at a transmission rate of 10 Gbps, an optical transmitter 303b that transmits an optical signal at a transmission rate of 1 Gbps, and an optical receiver 304a that receives an optical signal at a transmission rate of 10 Gbps. An optical receiver 304b that receives an optical signal with a transmission rate of 1 Gbps, a WDM filter 305a that reflects an optical signal with a wavelength of less than 1575 nm toward the WDM filter 305b, and transmits an optical signal with another wavelength, and a wavelength of 1360 nm or less. A WDM filter 305b that reflects an optical signal to the optical receiver 304b side and transmits an optical signal of another wavelength, an optical signal having a wavelength of 1280 nm or less is reflected to the optical receiver 304a, and an optical signal of another wavelength is transmitted. And a WDM filter 305c.
Each part in the station 300 is connected by optical fibers 308a to 308g.
　また、実施の形態１と同様に、光伝送システムにおいて下り通信を行う場合には、図２に示すように、伝送速度１０Ｇｂｐｓ用の光送信器３０３ａは、波長１５７５～１５８０ｎｍの帯域を使用して光受信器１１４ａに光信号を伝送する。また、伝送速度１Ｇｂｐｓ用の光送信器３０３ｂは、波長１４８０～１５００ｎｍの帯域を使用して光受信器１１４ｂに光信号を伝送する。 Similarly to the first embodiment, when performing downlink communication in the optical transmission system, as shown in FIG. 2, the optical transmitter 303a for a transmission rate of 10 Gbps uses a band of wavelengths 1575 to 1580 nm. An optical signal is transmitted to the optical receiver 114a. The optical transmitter 303b for a transmission rate of 1 Gbps transmits an optical signal to the optical receiver 114b using a band with a wavelength of 1480 to 1500 nm.
　次に、上記のように構成された光伝送システムの動作について説明する。
　ここで、実施の形態３に係る光伝送システムの動作工程は、図４，５に示す実施の形態１に係る光伝送システムの動作工程と同様であり、図４，５を参照しながら説明を行う。
　まず、下り通信を行う場合について図４を参照しながら説明する。
　なお以下では、光送信器３０３ａから伝送速度１０Ｇｂｐｓの光信号を出力し、同時に光送信器３０３ｂから伝送速度１Ｇｂｐｓの光信号を出力して、ＯＮＵ１１１ａ，１１１ｂに伝送する場合について説明する。また、実施の形態３に係るＯＮＵ１１１ａ，１１１ｂの動作は、図４に示す実施の形態１に係るＯＮＵ１１１ａ，１１１ｂの動作と同様であるため、その説明を省略する。 Next, the operation of the optical transmission system configured as described above will be described.
Here, the operation process of the optical transmission system according to the third embodiment is the same as the operation process of the optical transmission system according to the first embodiment shown in FIGS. 4 and 5, and will be described with reference to FIGS. Do.
First, the case of performing downlink communication will be described with reference to FIG.
In the following, a case will be described in which an optical signal having a transmission rate of 10 Gbps is output from the optical transmitter 303a and an optical signal having a transmission rate of 1 Gbps is output from the optical transmitter 303b and transmitted to the ONUs 111a and 111b. Further, the operations of the ONUs 111a and 111b according to Embodiment 3 are the same as the operations of the ONUs 111a and 111b according to Embodiment 1 shown in FIG.
　この光伝送システムの下り通信では、図４に示すように、まず、光送信器３０３ａは伝送速度１０Ｇｂｐｓで光信号を出力し、光送信器３０３ｂは伝送速度１Ｇｂｐｓで光信号を出力する（ステップＳＴ４１）。
　このステップＳＴ４１において、光送信器３０３ａでは、波長１５７５～１５８０ｎｍの帯域を使用して、伝送速度１０Ｇｂｐｓで光信号を出力する。この光送信器３０３ａにより出力された光信号は、ＷＤＭフィルタ３０５ａに伝送される。
　同様に、光送信器３０３ｂでは、波長１４８０～１５００ｎｍの帯域を使用して、伝送速度１Ｇｂｐｓで光信号を出力する。この光送信器３０３ｂにより出力された光信号は、ＷＤＭフィルタ３０５ａに伝送される。 In downlink communication of this optical transmission system, as shown in FIG. 4, first, the optical transmitter 303a outputs an optical signal at a transmission rate of 10 Gbps, and the optical transmitter 303b outputs an optical signal at a transmission rate of 1 Gbps (step ST41). ).
In step ST41, the optical transmitter 303a outputs an optical signal at a transmission rate of 10 Gbps using a band of wavelengths 1575 to 1580nm. The optical signal output from the optical transmitter 303a is transmitted to the WDM filter 305a.
Similarly, the optical transmitter 303b outputs an optical signal at a transmission rate of 1 Gbps using a wavelength band of 1480 to 1500 nm. The optical signal output by the optical transmitter 303b is transmitted to the WDM filter 305a.
　次いで、ＷＤＭフィルタ３０５ａは、伝送速度１０Ｇｂｐｓの光信号および伝送速度１Ｇｂｐｓの光信号を合波する（ステップＳＴ４２）。ここで、ＷＤＭフィルタ３０５ａは、光送信器３０３ａからの光信号を透過し、光送信器３０３ｂからの光信号を反射することにより合波を行う。このＷＤＭフィルタ３０５ａにより合波された光信号は、ＷＤＭフィルタ３０５ｂ，３０５ｃを透過して、光スプリッタ３０９に伝送される。
　その後、光スプリッタ３０９に伝送された光信号は、各光信号主端末回線１３０に４分岐され、光スプリッタ１２０に伝送される。その後、光信号は、光スプリッタ１２０により８分岐され、ＯＮＵ１１１ａ，１１１ｂに伝送される。 Next, the WDM filter 305a combines an optical signal with a transmission rate of 10 Gbps and an optical signal with a transmission rate of 1 Gbps (step ST42). Here, the WDM filter 305a performs multiplexing by transmitting the optical signal from the optical transmitter 303a and reflecting the optical signal from the optical transmitter 303b. The optical signal combined by the WDM filter 305 a passes through the WDM filters 305 b and 305 c and is transmitted to the optical splitter 309.
Thereafter, the optical signal transmitted to the optical splitter 309 is branched into four optical signal main terminal lines 130 and transmitted to the optical splitter 120. Thereafter, the optical signal is branched into eight by the optical splitter 120 and transmitted to the ONUs 111a and 111b.
　次に、上り通信を行う場合について図５を参照しながら説明する。
　なお以下では、光送信器１１３ａから伝送速度１０Ｇｂｐｓの光信号を出力し、同時に光送信器１１３ｂから伝送速度１Ｇｂｐｓの光信号を出力して、ＯＬＴ３０１に伝送する場合について説明する。また、実施の形態３に係るＯＮＵ１１１ａ，１１１ｂの動作は、図５に示す実施の形態１に係るＯＮＵ１１１ａ，１１１ｂの動作と同様であるため、その説明を省略する。 Next, a case where uplink communication is performed will be described with reference to FIG.
In the following, a case will be described in which an optical signal having a transmission rate of 10 Gbps is output from the optical transmitter 113a and an optical signal having a transmission rate of 1 Gbps is output from the optical transmitter 113b and transmitted to the OLT 301 at the same time. Further, the operations of the ONUs 111a and 111b according to Embodiment 3 are the same as the operations of the ONUs 111a and 111b according to Embodiment 1 shown in FIG.
　この光伝送システムの上り通信では、図５に示すように、ステップＳＴ５２において、光スプリッタ１２０により合波された光信号は、光スプリッタ３０９を介してＷＤＭフィルタ３０５ｃに伝送される。 In the upstream communication of this optical transmission system, as shown in FIG. 5, in step ST52, the optical signal combined by the optical splitter 120 is transmitted to the WDM filter 305c via the optical splitter 309.
　次いで、光受信器３０４ａは伝送速度１０Ｇｂｐｓの光信号を受信し、光受信器３０４ｂは伝送速度１Ｇｂｐｓの光信号を受信する（ステップＳＴ５３）。
　このステップＳＴ５３において、ＷＤＭフィルタ３０５ｃに伝送された光信号のうち、波長１２６０～１２８０ｎｍの伝送速度１０Ｇｂｐｓの光信号は反射され、光受信器３０４ａまで伝送される。
　一方、ＷＤＭフィルタ３０５ｃに伝送された光信号のうち、波長１２８５～１３６０ｎｍの伝送速度１Ｇｂｐｓの光信号は透過し、ＷＤＭフィルタ３０５ｂに伝送される。その後、伝送速度１Ｇｂｐｓの光信号は、ＷＤＭフィルタ３０５ｂにより反射され、光受信器３０４ｂまで伝送される。 Next, the optical receiver 304a receives an optical signal with a transmission rate of 10 Gbps, and the optical receiver 304b receives an optical signal with a transmission rate of 1 Gbps (step ST53).
In step ST53, among the optical signals transmitted to the WDM filter 305c, an optical signal having a wavelength of 1260 to 1280 nm and a transmission rate of 10 Gbps is reflected and transmitted to the optical receiver 304a.
On the other hand, among the optical signals transmitted to the WDM filter 305c, an optical signal having a wavelength of 1285 to 1360 nm and a transmission rate of 1 Gbps is transmitted and transmitted to the WDM filter 305b. Thereafter, an optical signal with a transmission rate of 1 Gbps is reflected by the WDM filter 305b and transmitted to the optical receiver 304b.
　以上のように、この実施の形態３によれば、ＷＤＭフィルタ３０５ａ～３０５ｃを直線上に配置するように構成したので、実施の形態１における効果に加えて、単純な部品の組合せだけでなく、２台のＷＤＭフィルタを内蔵し３波長の分割多重通信を可能にする部品であるトリプレクサ（Ｔｒｉｐｌｅｘｅｒ）モジュールをはじめ、すでに組立てられたモジュールの適用が可能となり、部品およびモジュールの選択の幅を広げることができる。 As described above, according to the third embodiment, since the WDM filters 305a to 305c are arranged on a straight line, in addition to the effects of the first embodiment, not only a simple combination of components, It is possible to apply already assembled modules, including triplexer modules that incorporate two WDM filters and enable three-wavelength division multiplex communication, and expand the range of component and module selection. Can do.
実施の形態４．
　実施の形態１～３では、伝送速度１Ｇｂｐｓおよび１０Ｇｂｐｓの光信号を共用化する場合について示したが、実施の形態４では、伝送速度１０Ｇｂｐｓおよび、さらに高速な伝送速度（例えば４０Ｇｂｐｓ）の光信号を共用化する場合について示す。
　図１０はこの発明の実施の形態４に係る光伝送システムの構成を示すブロック図である。
　図１０に示す実施の形態４に係る光伝送システムは、図１に示す実施の形態１における局舎１００を局舎４００に変更し、加入者建物１１０ｂを加入者建物２１０ｂに変更したものである。その他の構成は同様であり、同一の符号を付しその説明を省略する。 Embodiment 4 FIG.
In the first to third embodiments, the case where an optical signal having a transmission rate of 1 Gbps and 10 Gbps is shared has been described. In the fourth embodiment, an optical signal having a transmission rate of 10 Gbps and a higher transmission rate (for example, 40 Gbps) is used. The case of sharing is shown.
FIG. 10 is a block diagram showing a configuration of an optical transmission system according to Embodiment 4 of the present invention.
The optical transmission system according to the fourth embodiment shown in FIG. 10 is obtained by changing the station building 100 in the first embodiment shown in FIG. 1 to the station building 400 and changing the subscriber building 110b to the subscriber building 210b. . Other configurations are the same, and the same reference numerals are given and the description thereof is omitted.
　局舎４００には、伝送速度１０Ｇｂｐｓおよび４０Ｇｂｐｓ用の光送受信器４０２を有するＯＬＴ４０１と、光スプリッタ４０９とが設置されている。 The office 400 is provided with an OLT 401 having an optical transceiver 402 for transmission speeds of 10 Gbps and 40 Gbps, and an optical splitter 409.
　光送受信器４０２は、伝送速度１０Ｇｂｐｓ用の光送受信器１１２ａまたは伝送速度４０Ｇｂｐｓ用の光送受信器２１２ｂとの間で光信号の送受信を行うものである。この光送受信器４０２は、伝送速度１０Ｇｂｐｓで光信号を送信する光送信器４０３ａと、伝送速度４０Ｇｂｐｓで光信号を送信する光送信器４０３ｂと、伝送速度１０Ｇｂｐｓの光信号を受信する光受信器４０４ａと、伝送速度４０Ｇｂｐｓの光信号を受信する光受信器４０４ｂと、波長１５７５ｎｍ未満の光信号をＷＤＭフィルタ４０５ｂ側に反射し、その他の波長の光信号を透過するＷＤＭフィルタ４０５ａと、波長１３６０ｎｍ以下の光信号を光受信器４０４ｂ側に反射し、その他の波長の光信号を透過するＷＤＭフィルタ４０５ｂと、波長１２８０ｎｍ以下の光信号を光受信器４０４ａに反射し、その他の波長の光信号を透過するＷＤＭフィルタ４０５ｃとから構成されている。
　なお、局舎４００内の各部は、光ファイバ４０８ａ～４０８ｇにより接続されている。 The optical transmitter / receiver 402 transmits / receives an optical signal to / from the optical transmitter / receiver 112a for a transmission rate of 10 Gbps or the optical transmitter / receiver 212b for a transmission rate of 40 Gbps. The optical transceiver 402 includes an optical transmitter 403a that transmits an optical signal at a transmission rate of 10 Gbps, an optical transmitter 403b that transmits an optical signal at a transmission rate of 40 Gbps, and an optical receiver 404a that receives an optical signal at a transmission rate of 10 Gbps. An optical receiver 404b that receives an optical signal with a transmission rate of 40 Gbps, a WDM filter 405a that reflects an optical signal with a wavelength of less than 1575 nm toward the WDM filter 405b, and transmits an optical signal with another wavelength, and a wavelength of 1360 nm or less. A WDM filter 405b that reflects an optical signal to the optical receiver 404b side and transmits an optical signal of another wavelength, and an optical signal having a wavelength of 1280 nm or less is reflected to the optical receiver 404a and transmits an optical signal of another wavelength. And a WDM filter 405c.
Each part in the station 400 is connected by optical fibers 408a to 408g.
　加入者建物２１０ｂには、伝送速度４０Ｇｂｐｓ用の光送受信器２１２ｂを有するＯＮＵ２１１ｂと、波長１５７５～１５８０ｎｍの光信号を全反射し、その他の波長の光信号を透過するリジェクションフィルタ２１６ｂとが設置されている。 The subscriber building 210b is provided with an ONU 211b having an optical transceiver 212b for a transmission rate of 40 Gbps, and a rejection filter 216b that totally reflects an optical signal with a wavelength of 1575 to 1580 nm and transmits an optical signal with another wavelength. ing.
　光送受信器２１２ｂは、ＯＬＴ４０１の伝送速度４０Ｇｂｐｓ用の光送受信器（光送信器４０３ｂおよび光受信器４０４ｂ）との間で光信号の送受信を行うものである。この光送受信器２１２ｂは、伝送速度４０Ｇｂｐｓで光信号を送信する光送信器２１３ｂと、伝送速度４０Ｇｂｐｓの光信号を受信する光受信器２１４ｂと、波長１４８０ｎｍ以上の光信号を光受信器２１４ｂ側に反射し、その他の波長の光信号を透過するＷＤＭフィルタ２１５ｂとから構成されている。
　なお、加入者建物２１０ｂ内の各部は、光ファイバ２１７ｅ，２１７ｆにより接続されている。 The optical transceiver 212b transmits and receives optical signals to and from the optical transceiver (optical transmitter 403b and optical receiver 404b) for the transmission rate of 40 Gbps of the OLT 401. This optical transceiver 212b includes an optical transmitter 213b that transmits an optical signal at a transmission speed of 40 Gbps, an optical receiver 214b that receives an optical signal at a transmission speed of 40 Gbps, and an optical signal having a wavelength of 1480 nm or more to the optical receiver 214b side. The WDM filter 215b reflects and transmits optical signals of other wavelengths.
Each part in the subscriber building 210b is connected by optical fibers 217e and 217f.
　また、実施の形態１と同様に、光伝送システムにおいて下り通信を行う場合には、図２に示すように、伝送速度１０Ｇｂｐｓ用の光送信器４０３ａは、波長１５７５～１５８０ｎｍの帯域を使用して光受信器１１４ａに光信号を伝送する。また、伝送速度１Ｇｂｐｓ用の光送信器４０３ｂは、波長１４８０～１５００ｎｍの帯域を使用して光受信器２１４ｂに光信号を伝送する。 Similarly to the first embodiment, when performing downlink communication in an optical transmission system, as shown in FIG. 2, the optical transmitter 403a for a transmission rate of 10 Gbps uses a band of wavelengths 1575 to 1580 nm. An optical signal is transmitted to the optical receiver 114a. The optical transmitter 403b for a transmission rate of 1 Gbps transmits an optical signal to the optical receiver 214b using a band with a wavelength of 1480 to 1500 nm.
　同様に、上り通信を行う場合には、伝送速度１０Ｇｂｐｓ用の光送信器１１３ａは、波長１２６０～１２８０ｎｍの帯域を使用して光受信器４０４ａに光信号を伝送する。また、伝送速度４０Ｇｂｐｓ用の光送信器２１３ｂは、実施の形態１での伝送速度１Ｇｂｐｓに対する波長帯（１２８５～１３６０ｎｍ）を使用して光受信器４０４ｂに光信号を伝送する。 Similarly, when performing uplink communication, the optical transmitter 113a for a transmission rate of 10 Gbps transmits an optical signal to the optical receiver 404a using a band of wavelengths 1260 to 1280 nm. Further, the optical transmitter 213b for the transmission rate of 40 Gbps transmits the optical signal to the optical receiver 404b using the wavelength band (1285-1360 nm) corresponding to the transmission rate of 1 Gbps in the first embodiment.
　なお、上記のように構成された光伝送システムの動作は、実施の形態３に係る光伝送システムの動作と同様であり、その説明を省略する。 The operation of the optical transmission system configured as described above is the same as the operation of the optical transmission system according to the third embodiment, and a description thereof is omitted.
　以上のように、この実施の形態４によれば、伝送速度１０Ｇｂｐｓおよび、さらに高速な伝送速度（例えば４０Ｇｂｐｓ）の光信号を共用化する場合にも、既存の伝送速度１０Ｇｂｐｓ用のＯＬＴをそのまま流用することができる。このように、伝送速度に依存することなく、異なる伝送速度の光伝送システムを１台のＯＬＴで実現することが可能である。 As described above, according to the fourth embodiment, when an optical signal having a transmission rate of 10 Gbps and a higher transmission rate (for example, 40 Gbps) is shared, the existing OLT for the transmission rate of 10 Gbps is used as it is. can do. In this way, it is possible to realize optical transmission systems having different transmission speeds with a single OLT without depending on the transmission speed.
実施の形態５．
　実施の形態１では、リジェクションフィルタ１０６ａ，１０６ｂを用いて伝送速度１０Ｇｂｐｓおよび１Ｇｂｐｓの光信号を共用化する構成について示したが、実施の形態５では、リジェクションフィルタ１０６ａ，１０６ｂの代わりに、ある特定の波長を反射するファイバブラッググレーティング（ＦＢＧ）５０６ａ，５０６ｂを用いた場合について示す。
　図１１はこの発明の実施の形態５に係る光伝送システムの構成を示すブロック図である。
　図１１に示す実施の形態５に係る光伝送システムは、図１に示す実施の形態１における局舎１００を局舎５００に変更したものである。その他の構成は同様であり、同一の符号を付しその説明を省略する。 Embodiment 5 FIG.
In the first embodiment, the configuration in which the optical signals of the transmission speeds of 10 Gbps and 1 Gbps are shared using the rejection filters 106a and 106b has been described. However, in the fifth embodiment, instead of the rejection filters 106a and 106b, there is A case where fiber Bragg gratings (FBG) 506a and 506b that reflect a specific wavelength are used will be described.
FIG. 11 is a block diagram showing a configuration of an optical transmission system according to Embodiment 5 of the present invention.
The optical transmission system according to the fifth embodiment shown in FIG. 11 is obtained by changing the station building 100 in the first embodiment shown in FIG. Other configurations are the same, and the same reference numerals are given and the description thereof is omitted.
　局舎５００には、伝送速度１０Ｇｂｐｓ用の光送受信器５０２および伝送速度１Ｇｂｐｓ用の光送受信器５０７を有するＯＬＴ５０１と、光スプリッタ５０９と、光スプリッタ５０９と光送受信器５０７との間に配置され、波長１２６０～１２８０ｎｍの光信号を反射し、その他の波長の光信号を透過するＦＢＧ５０６ｂとが設置されている。 In the office building 500, an OLT 501 having an optical transceiver 502 for a transmission rate of 10 Gbps and an optical transceiver 507 for a transmission rate of 1 Gbps, an optical splitter 509, an optical splitter 509, and an optical transceiver 507 are arranged. An FBG 506b that reflects an optical signal with a wavelength of 1260 to 1280 nm and transmits an optical signal with another wavelength is installed.
　光送受信器５０２は、ＯＮＵ１１１ａの伝送速度１０Ｇｂｐｓ用の光送受信器１１２ａとの間で光信号の送受信を行うものである。この光送受信器５０２は、伝送速度１０Ｇｂｐｓで光信号を送信する光送信器５０３ａと、伝送速度１０Ｇｂｐｓの光信号を受信する光受信器５０４ａと、波長１３６０ｎｍ以下の光信号をＦＢＧ５０６ａ側に反射し、その他の波長の光信号を透過するＷＤＭフィルタ５０５ａと、波長１２８０ｎｍより大きい光信号を反射し、その他の波長の光信号を透過するＦＢＧ５０６ａとから構成されている。 The optical transmitter / receiver 502 transmits / receives an optical signal to / from the optical transmitter / receiver 112a for the ONU 111a having a transmission rate of 10 Gbps. This optical transceiver 502 reflects an optical signal having a wavelength of 1360 nm or less to the FBG 506a side, an optical transmitter 503a that transmits an optical signal at a transmission speed of 10 Gbps, an optical receiver 504a that receives an optical signal at a transmission speed of 10 Gbps, A WDM filter 505a that transmits an optical signal having another wavelength and an FBG 506a that reflects an optical signal having a wavelength larger than 1280 nm and transmits an optical signal having another wavelength are configured.
　光送受信器５０７は、ＯＮＵ１１１ｂの伝送速度１Ｇｂｐｓ用の光送受信器１１２ｂとの間で光信号の送受信を行うものである。この光送受信器５０７は、伝送速度１Ｇｂｐｓで光信号を送信する光送信器５０３ｂと、伝送速度１Ｇｂｐｓの光信号を受信する光受信器５０４ｂと、波長１３６０ｎｍ以下の光信号を光受信器５０４ｂ側に反射し、その他の波長の光信号を透過するＷＤＭフィルタ５０５ｂとから構成されている。
　なお、局舎５００内の各部は、光ファイバ５０８ａ～５０８ｈにより接続されている。 The optical transmitter / receiver 507 transmits / receives an optical signal to / from the optical transmitter / receiver 112b for the transmission speed of 1 Gbps of the ONU 111b. The optical transmitter / receiver 507 includes an optical transmitter 503b that transmits an optical signal at a transmission rate of 1 Gbps, an optical receiver 504b that receives an optical signal at a transmission rate of 1 Gbps, and an optical signal having a wavelength of 1360 nm or less to the optical receiver 504b side. The WDM filter 505b reflects and transmits optical signals of other wavelengths.
Each part in the station 500 is connected by optical fibers 508a to 508h.
　また、実施の形態１と同様に、光伝送システムにおいて下り通信を行う場合には、図２に示すように、伝送速度１０Ｇｂｐｓ用の光送信器５０３ａは、波長１５７５～１５８０ｎｍの帯域を使用して光受信器１１４ａに光信号を伝送する。また、伝送速度１Ｇｂｐｓ用の光送信器５０３ｂは、波長１４８０～１５００ｎｍの帯域を使用して光受信器１１４ｂに光信号を伝送する。 Similarly to the first embodiment, when performing downlink communication in the optical transmission system, as shown in FIG. 2, the optical transmitter 503a for a transmission rate of 10 Gbps uses a band of wavelengths 1575 to 1580 nm. An optical signal is transmitted to the optical receiver 114a. The optical transmitter 503b for a transmission rate of 1 Gbps transmits an optical signal to the optical receiver 114b using a band with a wavelength of 1480 to 1500 nm.
　次に、上記のように構成された光伝送システムの動作について説明する。
　ここで、実施の形態５に係る光伝送システムの動作工程は、図４，５に示す実施の形態１に係る光伝送システムの動作工程と同様であり、図４，５を参照しながら説明を行う。
　まず、下り通信を行う場合について図４を参照しながら説明する。
　なお以下では、光送信器５０３ａから伝送速度１０Ｇｂｐｓの光信号を出力し、同時に光送信器５０３ｂから伝送速度１Ｇｂｐｓの光信号を出力して、ＯＮＵ１１１ａ，１１１ｂに伝送する場合について説明する。また、実施の形態５に係るＯＮＵ１１１ａ，１１１ｂの動作は、図４に示す実施の形態１に係るＯＮＵ１１１ａ，１１１ｂの動作と同様であるため、その説明を省略する。 Next, the operation of the optical transmission system configured as described above will be described.
Here, the operation process of the optical transmission system according to the fifth embodiment is the same as the operation process of the optical transmission system according to the first embodiment shown in FIGS. 4 and 5, and will be described with reference to FIGS. Do.
First, the case of performing downlink communication will be described with reference to FIG.
In the following, a case will be described in which an optical signal with a transmission rate of 10 Gbps is output from the optical transmitter 503a and an optical signal with a transmission rate of 1 Gbps is simultaneously output from the optical transmitter 503b and transmitted to the ONUs 111a and 111b. Further, the operations of the ONUs 111a and 111b according to Embodiment 5 are the same as the operations of the ONUs 111a and 111b according to Embodiment 1 shown in FIG.
　この光伝送システムの下り通信では、図４に示すように、まず、光送信器５０３ａは伝送速度１０Ｇｂｐｓで光信号を出力し、光送信器５０３ｂは伝送速度１Ｇｂｐｓで光信号を出力する（ステップＳＴ４１）。
　このステップＳＴ４１において、光送信器５０３ａは、波長１５７５～１５８０ｎｍの帯域を使用して、伝送速度１０Ｇｂｐｓで光信号を出力する。この光送信器５０３ａにより出力された光信号は、ＷＤＭフィルタ５０５ａを透過して、光スプリッタ５０９に伝送される。
　同様に、光送信器５０３ｂは、波長１４８０～１５００ｎｍの帯域を使用して、伝送速度１Ｇｂｐｓで光信号を出力する。この光送信器５０３ｂにより出力された光信号は、ＷＤＭフィルタ５０５ｂおよびＦＢＧ５０６ｂを透過して、光スプリッタ５０９に伝送される。 In downlink communication of this optical transmission system, as shown in FIG. 4, first, the optical transmitter 503a outputs an optical signal at a transmission rate of 10 Gbps, and the optical transmitter 503b outputs an optical signal at a transmission rate of 1 Gbps (step ST41). ).
In step ST41, the optical transmitter 503a outputs an optical signal at a transmission rate of 10 Gbps using a band of wavelengths 1575 to 1580nm. The optical signal output by the optical transmitter 503a passes through the WDM filter 505a and is transmitted to the optical splitter 509.
Similarly, the optical transmitter 503b outputs an optical signal at a transmission rate of 1 Gbps using a band with a wavelength of 1480 to 1500 nm. The optical signal output by the optical transmitter 503b passes through the WDM filter 505b and the FBG 506b and is transmitted to the optical splitter 509.
　次いで、光スプリッタ５０９は、伝送速度１０Ｇｂｐｓの光信号および伝送速度１Ｇｂｐｓの光信号を合波する（ステップＳＴ４２）。この光スプリッタ５０９により合波された光信号は、各光信号主端末回線１３０に４分岐され、光スプリッタ１２０に伝送される。その後、光信号は、光スプリッタ１２０により８分岐され、ＯＮＵ１１１ａ，１１１ｂに伝送される。 Next, the optical splitter 509 multiplexes the optical signal with the transmission rate of 10 Gbps and the optical signal with the transmission rate of 1 Gbps (step ST42). The optical signals combined by the optical splitter 509 are branched into four optical signal main terminal lines 130 and transmitted to the optical splitter 120. Thereafter, the optical signal is branched into eight by the optical splitter 120 and transmitted to the ONUs 111a and 111b.
　次に、上り通信を行う場合について図５を参照しながら説明する。
　なお以下では、光送信器１１３ａから伝送速度１０Ｇｂｐｓの光信号を出力し、同時に光送信器１１３ｂから伝送速度１Ｇｂｐｓの光信号を出力して、ＯＬＴ５０１に伝送する場合について説明する。また、実施の形態５に係るＯＮＵ１１１ａ，１１１ｂの動作は、図５に示す実施の形態１に係るＯＮＵ１１１ａ，１１１ｂの動作と同様であるため、その説明を省略する。 Next, a case where uplink communication is performed will be described with reference to FIG.
In the following, a case where an optical signal with a transmission rate of 10 Gbps is output from the optical transmitter 113a and an optical signal with a transmission rate of 1 Gbps is simultaneously output from the optical transmitter 113b and transmitted to the OLT 501 will be described. Further, the operations of the ONUs 111a and 111b according to Embodiment 5 are the same as the operations of the ONUs 111a and 111b according to Embodiment 1 shown in FIG.
　この光伝送システムの上り通信では、図５に示すように、ステップＳＴ５２において、光スプリッタ１２０により合波された光信号は、光スプリッタ５０９により２分岐され、ＯＬＴ５０１の光送受信器５０２およびＦＢＧ５０６ｂに伝送される。 In the upstream communication of this optical transmission system, as shown in FIG. 5, in step ST52, the optical signal combined by the optical splitter 120 is branched into two by the optical splitter 509 and transmitted to the optical transceiver 502 and the FBG 506b of the OLT 501. Is done.
　次いで、光受信器５０４ａは伝送速度１０Ｇｂｐｓの光信号を受信し、光受信器５０４ｂは伝送速度１Ｇｂｐｓの光信号を受信する（ステップＳＴ５３）。
　このステップＳＴ５３において、光送受信器５０２に伝送された光信号は、ＷＤＭフィルタ５０５ａにより反射され、ＦＢＧ５０６ａに伝送される。その後、ＦＢＧ５０６ａに伝送された光信号のうち、波長１２８５ｎｍ～１３６０ｎｍの伝送速度１Ｇｂｐｓの光信号は反射され、波長１２６０～１２８０ｎｍの伝送速度１０Ｇｂｐｓの光信号は透過し、光受信器５０４ａまで伝送される。
　同様に、ＦＢＧ５０６ｂに伝送された光信号のうち、波長１２６０～１２８０ｎｍの伝送速度１０Ｇｂｐｓの光信号は反射され、波長１２８５～１３６０ｎｍの伝送速度１Ｇｂｐｓの光信号は透過する。その後、伝送速度１Ｇｂｐｓの光信号は、ＷＤＭフィルタ５０５ｂにより反射され、光受信器５０４ｂまで伝送される。 Next, the optical receiver 504a receives an optical signal with a transmission rate of 10 Gbps, and the optical receiver 504b receives an optical signal with a transmission rate of 1 Gbps (step ST53).
In step ST53, the optical signal transmitted to the optical transceiver 502 is reflected by the WDM filter 505a and transmitted to the FBG 506a. After that, among the optical signals transmitted to the FBG 506a, an optical signal with a transmission speed of 1 Gbps with a wavelength of 1285 nm to 1360 nm is reflected, and an optical signal with a transmission speed of 10 Gbps with a wavelength of 1260 to 1280 nm is transmitted and transmitted to the optical receiver 504a. .
Similarly, among the optical signals transmitted to the FBG 506b, an optical signal with a wavelength of 1260 to 1280 nm and a transmission speed of 10 Gbps is reflected, and an optical signal with a wavelength of 1285 to 1360 nm and a transmission speed of 1 Gbps is transmitted. Thereafter, an optical signal with a transmission rate of 1 Gbps is reflected by the WDM filter 505b and transmitted to the optical receiver 504b.
　以上のように、この実施の形態５によれば、リジェクションフィルタ１０６ａ，１０６ｂの代わりにＦＢＧ５０６ａ，５０６ｂを用いるように構成したので、実施の形態１における効果に加えて、フィルタを使用せずにファイバを適用できるため、簡易に光伝送システムを構成することができる。 As described above, according to the fifth embodiment, since the FBGs 506a and 506b are used instead of the rejection filters 106a and 106b, in addition to the effects of the first embodiment, a filter is not used. Since a fiber can be applied, an optical transmission system can be configured easily.
　なお、実施の形態１～５では、光伝送システムとして、ＯＬＴおよび複数のＯＮＵを備えたＰＯＮシステムを用いて説明を行ったが、これに限るものではなく、一般的な光伝送システムに対して適用可能であり、多重波長通信技術に利用可能である。
　また、本願発明の範囲内において、実施の形態を適宜組合せ、変更、省略などすることが可能である。 In the first to fifth embodiments, the description has been given using the PON system including the OLT and the plurality of ONUs as the optical transmission system. However, the present invention is not limited to this, and a general optical transmission system is used. It is applicable and can be used for multi-wavelength communication technology.
Further, within the scope of the present invention, the embodiments can be appropriately combined, changed, or omitted.
　以上のように、この発明に係る光伝送システムは、異なる伝送速度の光信号を共用化する場合に、既存のＯＬＴを置き換えることなく流用することができ、かつ、安価に構成することができるようにしたため、ＯＬＴと各ＯＮＵとの間で異なる伝送速度の光信号を送受信可能に構成した光伝送システム等に用いるのに適している。 As described above, the optical transmission system according to the present invention can be used without replacing the existing OLT when sharing optical signals having different transmission speeds and can be configured at low cost. Therefore, it is suitable for use in an optical transmission system configured to be able to transmit and receive optical signals having different transmission speeds between the OLT and each ONU.
　１００～５００　局舎、１０１～５０１　局舎側光信号伝送装置（ＯＬＴ）、１０２～５０２，１０７，５０７　光送受信器、１０３ａ～５０３ａ，１０３ｂ～５０３ｂ　光送信器、１０４ａ～５０４ａ，１０４ｂ～５０４ｂ　光受信器、１０５ａ～５０５ａ，１０５ｂ～５０５ｂ，２０５ｃ～４０５ｃ　波長分割多重（ＷＤＭ）フィルタ、１０６ａ，１０６ｂ　リジェクションフィルタ、１０８～５０８　光ファイバ、１０９～５０９　光スプリッタ、５０６ａ，５０６ｂ　ファイバブラッググレーティング（ＦＢＧ）、１１０ａ，１１０ｂ，２１０ｂ　加入者建物、１１１ａ，１１１ｂ，２１１ｂ　加入者側光信号伝送装置（ＯＮＵ）、１１２ａ，１１２ｂ，２１２ｂ　光送受信器、１１３ａ，１１３ｂ，２１３ｂ　光送信器、１１４ａ，１１４ｂ，２１４ｂ　光受信器、１１５ａ，１１５ｂ，２１５ｂ　波長分割多重（ＷＤＭ）フィルタ、１１６ａ，１１６ｂ，２１６ｂ　リジェクションフィルタ、１１７ａ～１１７ｆ，２１７ｂ，２１７ｅ，２１７ｆ　光ファイバ、１２０　光スプリッタ、１３０　光信号主端末回線。 100 to 500 office buildings, 101 to 501 office side optical signal transmission devices (OLT), 102 to 502, 107, 507, optical transceivers, 103a to 503a, 103b to 503b, optical transmitters, 104a to 504a, 104b to 504b, light Receiver, 105a to 505a, 105b to 505b, 205c to 405c, wavelength division multiplexing (WDM) filter, 106a, 106b rejection filter, 108 to 508 optical fiber, 109 to 509 optical splitter, 506a, 506b fiber Bragg grating (FBG) 110a, 110b, 210b, subscriber building, 111a, 111b, 211b, subscriber side optical signal transmission unit (ONU), 112a, 112b, 212b, optical transceiver, 113a, 113b, 213b, optical transmitter, 114 , 114b, 214b optical receiver, 115a, 115b, 215b wavelength division multiplexing (WDM) filter, 116a, 116b, 216b rejection filter, 117a-117f, 217b, 217e, 217f optical fiber, 120 optical splitter, 130 optical signal main Terminal line.

Claims (4)

  1. 　局舎側光信号伝送装置と、前記局舎側光信号伝送装置との間で第１の伝送速度で通信を行う第１の加入者側光信号伝送装置と、前記局舎側光信号伝送装置との間で第２の伝送速度で通信を行う第２の加入者側光信号伝送装置とを備えた光伝送システムにおいて、
    　前記局舎側光信号伝送装置は、
    　前記第１の伝送速度の光信号を受信する第１の光受信器と、
    　前記第２の伝送速度の光信号を受信する第２の光受信器とを備え、
    　前記第１の加入者側光信号伝送装置は、
    　第１の波長帯を使用して、前記第１の伝送速度で光信号を送信する光送信器を備え、
    　前記第２の加入者側光信号伝送装置は、
    　第２の波長帯を使用して、前記第２の伝送速度で光信号を送信する光送信器を備え、
    　前記第１の光受信器および前記第２の光受信器の前段に、第１の波長帯の光信号を前記第１の光受信器に送信し、第２の波長帯の光信号を前記第２の光受信器に送信するフィルタを設けた
    ことを特徴とする光伝送システム。     A first subscriber-side optical signal transmission device that performs communication at a first transmission rate between the station-side optical signal transmission device and the station-side optical signal transmission device, and the station-side optical signal transmission device An optical transmission system including a second subscriber-side optical signal transmission device that performs communication at a second transmission rate with
    The station side optical signal transmission device is:
    A first optical receiver for receiving an optical signal of the first transmission rate;
    A second optical receiver for receiving an optical signal of the second transmission rate,
    The first subscriber side optical signal transmission device is:
    An optical transmitter for transmitting an optical signal at the first transmission rate using a first wavelength band;
    The second subscriber side optical signal transmission device is:
    An optical transmitter that transmits an optical signal at the second transmission rate using a second wavelength band;
    Before the first optical receiver and the second optical receiver, an optical signal in the first wavelength band is transmitted to the first optical receiver, and an optical signal in the second wavelength band is transmitted to the first optical receiver. An optical transmission system comprising a filter for transmitting to the optical receiver of No. 2.
  2. 　前記局舎側光信号伝送装置は、既存の前記第１の光受信器を流用し、前記第２の光受信器を付け加えて構成される
    ことを特徴とする請求項１記載の光伝送システム。     2. The optical transmission system according to claim 1, wherein the station-side optical signal transmission device is configured by diverting the existing first optical receiver and adding the second optical receiver. 3.
  3. 　前記フィルタは、リジェクションフィルタ、波長分割多重フィルタまたはファイバブラッググレーティングを組み合わせて構成される
    ことを特徴とする請求項１記載の光伝送システム。     The optical transmission system according to claim 1, wherein the filter is configured by combining a rejection filter, a wavelength division multiplexing filter, or a fiber Bragg grating.
  4. 　前記フィルタは、トリプレクサモジュールにより構成される
    ことを特徴とする請求項１記載の光伝送システム。     The optical transmission system according to claim 1, wherein the filter includes a triplexer module.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004091123A1 (en) * 2003-04-02 2004-10-21 Sumitomo Electric Industries, Ltd. Optical communication system having optical amplification function
JP2009218920A (en) * 2008-03-11 2009-09-24 Mitsubishi Electric Corp Communication system and communication method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004091123A1 (en) * 2003-04-02 2004-10-21 Sumitomo Electric Industries, Ltd. Optical communication system having optical amplification function
JP2009218920A (en) * 2008-03-11 2009-09-24 Mitsubishi Electric Corp Communication system and communication method

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