WO2007108126A1 - Systeme de communication optique a point/multipoint - Google Patents

Systeme de communication optique a point/multipoint Download PDF

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Publication number
WO2007108126A1
WO2007108126A1 PCT/JP2006/305857 JP2006305857W WO2007108126A1 WO 2007108126 A1 WO2007108126 A1 WO 2007108126A1 JP 2006305857 W JP2006305857 W JP 2006305857W WO 2007108126 A1 WO2007108126 A1 WO 2007108126A1
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WO
WIPO (PCT)
Prior art keywords
wavelength
communication system
optical communication
point
slot
Prior art date
Application number
PCT/JP2006/305857
Other languages
English (en)
Japanese (ja)
Inventor
Junichi Nakagawa
Original Assignee
Mitsubishi Denki Kabushiki Kaisha
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Denki Kabushiki Kaisha filed Critical Mitsubishi Denki Kabushiki Kaisha
Priority to PCT/JP2006/305857 priority Critical patent/WO2007108126A1/fr
Priority to JP2008506130A priority patent/JP5058972B2/ja
Priority to TW095114842A priority patent/TWI311872B/zh
Publication of WO2007108126A1 publication Critical patent/WO2007108126A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0226—Fixed carrier allocation, e.g. according to service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • 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
    • H04J14/0228—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths
    • H04J14/023—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON]
    • H04J14/0232—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON] for downstream transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
    • H04J14/0246—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0245—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
    • H04J14/0278—WDM optical network architectures
    • H04J14/0282—WDM tree architectures

Definitions

  • the present invention relates to a point multipoint optical communication system in which one or more station side devices and a plurality of subscriber side devices perform data transmission / reception using one optical network.
  • point multipoint optical communication system As a form of point multipoint optical communication system, multiple point multipoint optical communication systems are multiplexed by wavelength multiplexing technology to increase the co-efficiency of optical fiber transmission lines. Communication systems are being studied (for example, see Patent Document 1 and Non-Patent Document 1).
  • FIG. 8 is an illustration of wavelength arrangement in a conventional point multipoint optical communication system (hereinafter abbreviated as point multipoint optical communication system) to which optical wavelength multiplexing technology is applied.
  • FIG. 9 is a block diagram of a conventional point multipoint optical communication system using the wavelength arrangement shown in FIG.
  • FIG. 9 shows a point multi-point light (m is an integer of 2 or more) by applying an optical wavelength multiplexing technique when the wavelength arrangement shown in FIG. 8 is used. It is a block diagram in which communication systems (1 (1) to: L (m)) are multiplexed.
  • the k-th point among m multiplexed multi-point optical communication systems 1 (k) is a subscription of station side device 2 (k) and multiple nks (nk is an integer of 2 or more)
  • optical fiber 5 wavelength multiplexer / demultiplexer 6 on the station side
  • wavelength multiplexer / demultiplexers 7, 8 and m force bras 9 (1) -9 (m)
  • It consists of a wavelength multiplexing / demultiplexing queue 10 provided in the middle.
  • optical fiber 5 the wavelength side multiplexer / demultiplexer 6 on the station side, and the wavelength multiplexing / demultiplexing unit 10 in the middle of the transmission line are composed of a multi-meter point multipoint optical communication system 1 (1) -1 Commonly used in m).
  • one of the wavelength slots for example, equally spaced wavelength slot 41 (0) is assigned to all downstream signal lights, and the remaining equally spaced
  • wavelength slots 41 (1) to 41 (m) are assigned to the upstream signal light of multiple subscriber-side device power in multiple-m point multipoint optical communication systems.
  • the wavelength multiplexing / demultiplexing unit 10 in the middle of transmission needs to have a very complicated configuration. This is because the upstream signal light and the downstream signal light are transmitted in the wavelength multiplexing / demultiplexing unit 10 in order to transmit and receive data between the station side device 2 and the plurality of subscriber side devices 3. It is necessary to input / output from one port, but the upstream signal light and downstream signal light are arranged in the equally spaced wavelength slots 41 that are not the same, so only one wavelength multiplexer / demultiplexer is used. This is not possible.
  • the wavelength multiplexing / demultiplexing unit 10 includes a plurality of m + 1 single equally spaced wavelength slots 41 (0) to 41 ( m) a wavelength multiplexer / demultiplexer 7 that multiplexes and demultiplexes, a wavelength multiplexer / demultiplexer 8 that multiplexes and demultiplexes the downstream wavelength multiplexed signal light, and combines the downstream signal light and the upstream signal light, Multiple force bra 9 (1)-9 (m) forces must be constructed.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2004-222255
  • Non-Patent Document 1 D. Nesset, ECOC2005, Tu. 1. 3. 1.
  • the wavelength multiplexing / demultiplexing unit 10 that has to have such a complicated configuration has a problem that it is expensive as a result and is difficult to apply to a light power entrance system that requires a low price.
  • the present invention has been made to solve the above-described problems, and reduces the cost of the subscriber side device. It is an object to obtain a point multipoint optical communication system that enables stoicing. Means for solving the problem
  • one station-side device and a plurality of subscriber-side devices are connected by an optical network via a wavelength multiplexer / demultiplexer and an optical fiber transmission line.
  • the central wavelength of a station side device and multiple subscriptions The center wavelength of the user side device is arranged in one wavelength slot having the wavelength slot width ⁇ d, and the wavelength slot having the wavelength slot width ⁇ d is the first wavelength slot width ⁇ dl and the second wavelength slot.
  • the wavelength slot having a second wavelength slot width delta d2 in which the center wavelength of the plurality of subscriber units are arranged.
  • the center wavelength of the station side device and the center wavelength of the plurality of subscriber side devices are individually arranged in a pair of wavelength slots obtained by dividing one wavelength slot, and the plurality of subscriber side devices By assigning a wider wavelength slot width than the wavelength slot width of the station side device, it is possible to obtain a point multipoint optical communication system that enables low cost of the subscriber side device.
  • FIG. 1 is a configuration diagram of a point multipoint optical communication system according to Embodiment 1 of the present invention.
  • FIG. 2 is a diagram showing a wavelength arrangement of a point multipoint optical communication system according to Embodiment 1 of the present invention.
  • FIG. 3 is a configuration diagram in which a plurality of m point multipoint optical communication systems according to Embodiment 2 of the present invention are multiplexed by wavelength multiplexing.
  • FIG. 4 is a diagram showing a wavelength arrangement of a multi-meter point multipoint optical communication system according to Embodiment 2 of the present invention.
  • FIG. 5 is a configuration diagram in which a plurality of m point multipoint optical communication systems according to Embodiment 3 of the present invention are multiplexed by wavelength multiplexing.
  • FIG. 6 is a diagram showing a wavelength arrangement of a kth point multipoint optical communication system in Embodiment 3 of the present invention.
  • FIG. 7 Multiple m 1.45 in Embodiment 3 of the present invention: L 65 m band equally spaced wavelength slots and multiple m 1.3 m band equally spaced wavelength slots using wavelength multiplexing technology It is a figure in the case of multiplexing.
  • FIG. 8 is an illustration of wavelength arrangement in a conventional multi-point optical communication system (hereinafter abbreviated as a point-to-multipoint optical communication system).
  • FIG. 9 is a configuration diagram of a conventional point multipoint optical communication system using the wavelength arrangement shown in FIG. 8.
  • the center wavelength of the station side device and the center wavelength of the plurality of subscriber side devices are arranged in one wavelength slot, and the wavelength slot widths of the plurality of subscriber side devices are It is a technical feature that it is arranged wider than the wavelength slot width of the side equipment, and in such a multipoint point-to-multipoint optical communication system that uses low power to realize the low cost of the subscriber side equipment, By performing multiplexing based on the configuration, there is also an advantage that the configuration of the wavelength multiplexer / demultiplexer can be simplified.
  • FIG. 1 is a configuration diagram of a point multipoint optical communication system according to Embodiment 1 of the present invention.
  • Point in Figure 1 Multipoint optical communication system 1 includes station-side devices 2 and n (n is an integer of 2 or more) subscriber-side devices 3 (1) to 3 (n), station-side devices 2 and n It consists of a star force bra 4 and an optical fiber 5 that connect the subscriber side devices 3 (1) to 3 (n)
  • FIG. 2 shows a point multipoint optical communication system 1 according to Embodiment 1 of the present invention. It is the figure which showed wavelength arrangement
  • equally spaced wavelength slots 21 defined by the wavelength interval ⁇ d are indicated by broken lines. Further, the equally spaced wavelength slots 21 include a downstream wavelength slot 22 and an upstream wavelength slot 23 formed by dividing the equally spaced wavelength slot 21.
  • the basic configuration of a point multipoint optical communication system having one station side device 2 and a plurality of subscriber side devices 3 (1) to 3 (n) as shown in FIG. This is called an optical communication system.
  • one equally spaced wavelength slot 21 may be arranged.
  • the downstream wavelength slot 22 is obtained by dividing the equally spaced wavelength slot 21 and has a wavelength slot width ⁇ ⁇ dl (corresponding to the first wavelength slot width). And assigned to the optical signals from the station side device 2 to the plurality of subscriber side devices 3 (1) to 3 (n).
  • the upstream wavelength slot 23 is an upstream wavelength slot having a wavelength slot width of ⁇ ⁇ d2 (corresponding to the second wavelength slot width) formed by dividing the equally spaced wavelength slot 21. These are assigned to the optical signals from the plurality of subscriber side devices 3 (1) to 3 (n) to the station side device 2.
  • one downstream signal light 24 is arranged in the downstream wavelength slot 22, and n upstream signal lights 25 (1 ) To 25 (n) are illustrated.
  • n upstream signal lights 25 (1 ) To 25 (n) are illustrated.
  • Fig. 2 shows the case where broadcast communication is applied to downlink communication and time division multiplex communication is applied to uplink communication.
  • a point multipoint optical communication system which is a basic configuration optical communication system as shown in FIG.
  • the station side device 2, the star force bra 4, and the optical fiber 5 are shared by the n subscriber side devices 3 (1) to 3 (n) to achieve low cost.
  • the transmission light sources of the station-side device 2 and the n subscriber-side devices 3 (1) to 3 (n) are key devices that occupy a large part of the cost.
  • the requirement for the wavelength range of the transmission light source is a parameter that determines the cost. Therefore, as shown in FIG. 2, by setting ⁇ dl ⁇ ⁇ d2 and making the upstream and downstream wavelength slot ranges asymmetric, there is a requirement for the wavelength range of n subscriber side devices 3 (1) to 3 (n). Conditions can be relaxed and low cost can be achieved.
  • the wavelength arrangement shown in FIG. 2 is such that the downstream signal light 24 and the upstream signal light 25 are respectively provided in separate wavelength slots (downstream wavelength slot 22 and upstream wavelength slot 23. It is also effective for the resistance to reflection on the optical fiber 5 that is the transmission line.
  • the downstream signal light 24 is reflected in the optical fiber 5 and returns to the transmission side.
  • the downstream signal light 24 and the upstream signal light 25 are not placed in different wavelength slots (that is, when they are placed in the same wavelength slot)
  • the downstream signal light 24 The crosstalk that occurs between the reflected light and the upstream signal light 25 becomes coherent crosstalk when the wavelengths of the two coincide, causing a significant deterioration in transmission quality.
  • the downstream signal light 24 and the upstream signal light 25 are placed in different wavelength slots. Even if reflection occurs, the possibility of coherent crosstalk is zero, and transmission quality can be kept high.
  • the downstream wavelength slot in which the central wavelength of the station side device is arranged, and the downstream wavelength slot in which the central wavelengths of the plurality of subscriber side devices are arranged. are arranged in one equally spaced wavelength slot, and the wavelength slot widths of a plurality of subscriber side devices are assigned wider than the wavelength slot widths of the station side devices.
  • FIG. 3 shows a case where a plurality of m (m is an integer of 2 or more) point-multipoint optical communication systems (1 (1) to: L (m)) in Embodiment 2 of the present invention are multiplexed by wavelength multiplexing.
  • Each of the multiple m point multipoint optical communication systems 1 (1) to 1 (m) is different only in the wavelength slot allocated to the optical communication, and the basic configuration is the same as in the first embodiment. It is the same as explained, and all are equal. Further, the optical fiber 5, the wavelength multiplexer / demultiplexer 6, and the wavelength multiplexer / demultiplexer 7 are shared by each of a plurality of m point multipoint optical communication systems 1 (1) to 1 (m). Further, the star couplers 4 (1) to 4 (111) may have different characteristics or may be optical power bras having the same characteristics.
  • FIG. 4 is a diagram showing the wavelength arrangement of a plurality of m-point multi-point optical communication systems 1 (1) to L (m) according to the second embodiment of the present invention.
  • m equally spaced wavelength slots 21 (1) to 21 (m) defined by equal wavelength intervals ⁇ d are indicated by broken lines.
  • a downstream wavelength slot formed by dividing the equally spaced wavelength slots 21 (1) to 21 (m). 22 (1) to 22 (m) and upstream wavelength slots 23 (1) to 23 (m) are included, each paired for each basic configuration optical communication system.
  • the kth downstream wavelength slot 22 (k) accommodates one wavelength at which the kth station-side device 2 (k) force is also transmitted.
  • the k-th upstream wavelength slot 23 (k) nk wavelengths transmitted from the k-th plurality of subscriber-side devices 3 (k, l) to 3 (k, nk) Is housed.
  • the k-th downstream wavelength slot 22 (k) and the k-th upstream wavelength slot 23 (k) are housed in an equally spaced wavelength slot 21 (k) as a pair of configurations, A plurality of m equally-spaced wavelength slots 21 (1) to 21 (m) are multiplexed using a wavelength multiplexing technique.
  • a system in which a plurality of m-point multipoint optical communication systems 1 (1) to 1 (m) are wavelength-multiplexed as shown in FIGS. 3 and 4 is the same as the basic configuration optical communication system of the first embodiment.
  • the upstream and downstream wavelength slot ranges are asymmetrical with each of the m, it is possible to relax the requirements for the wavelength ranges of the plurality of subscriber side devices 3. As a result, cost reduction can be realized.
  • the wavelength multiplexer / demultiplexer 7 arranged in the middle of the transmission path multiplexes a plurality of m equally spaced wavelength slots 21 (1) to 21 (m). It only needs to have the function of demultiplexing. Therefore, the circuit configuration is greatly simplified compared to the conventional wavelength arrangement (see Fig. 9), which has a complicated configuration that combines multiple wavelength multiplexers / demultiplexers and optical power bras. It can be simplified, the cost can be reduced, and the maintenance work can be simplified.
  • the wavelength arrangement as shown in FIG. 4 is also effective for the resistance against reflection by the optical fiber 5 serving as a transmission line, as in the first embodiment.
  • FIG. 5 is a configuration diagram in which a plurality of m point multipoint optical communication systems ((1) to: L (m)) according to Embodiment 3 of the present invention are multiplexed by wavelength multiplexing. That is, the point multipoint optical communication system in FIG. 3 is the same as the basic configuration optical communication system described in the first embodiment in the common optical fiber 5, the wavelength multiplexer / demultiplexer 6 on the station side, and the transmission path. Using a wavelength multiplexer / demultiplexer 7, m are connected.
  • Nk subscriber side devices 3 (k, 1) to 3 (k, nk), station side device 2 (k) and nk subscriber side devices 3 (k, 1) to 3 (k, nk) is connected to the star force bra 4 (k), the optical fiber 5, the reciprocal wavelength multiplexer / demultiplexer 6a having the recurring characteristics on the station side, and the recursive wavelength demultiplexing / demultiplexing having recurring characteristics in the middle of the transmission path. It is composed of 7a.
  • the configuration of FIG. 5 of the third embodiment includes the cyclic wavelength multiplexer / demultiplexers 6a and 7a instead of the wavelength multiplexer / demultiplexers 6 and 7. Different points are used.
  • Each of the multiple m point multipoint optical communication systems 1 (1) to 1 (m) is different only in the wavelength slot allocated to the optical communication, and the basic configuration is as in the first embodiment. It is the same as explained, and all are equal.
  • the optical fiber 5, the cyclic wavelength multiplexer / demultiplexer 6a, and the cyclic wavelength multiplexer / demultiplexer 6a are shared by each of the multi-point multi-point optical communication systems 1 (1) to 1 (m).
  • the star force bras 4 (1) to 4 (m) may have different characteristics or may be optical power bras having the same characteristics.
  • FIG. 6 is a diagram showing a wavelength arrangement of the kth point multipoint optical communication system 1 (k) in the third embodiment of the present invention.
  • the equidistant wavelength slot 31 (k) is an equidistant wavelength slot defined by an equal wavelength interval ⁇ d of 1.45 ⁇ : L 65 m band.
  • This equally-spaced wavelength slot 31 (k) includes a downstream wavelength slot 34 (k) having a downstream signal light 36 (k).
  • the equally spaced wavelength slot 32 (k) is an equally spaced wavelength slot defined by an equal wavelength interval ⁇ d of the 1.3 m band.
  • This equally-spaced wavelength slot 32 (k) includes an upstream wavelength slot 35 (k) having upstream signal light 37 (k).
  • the point-multipoint optical communication system 1 (k) uses the recurring wavelength multiplexers / demultiplexers 6a and 7a, 1.45 ⁇ : L 65 m band equally spaced wavelength slots for the downlink direction 31 (k) and 1.3 m band equally spaced wavelength slot 32 (k) force Input and output from the same I / O port, and equally spaced wavelength slot 31 (k) and equally spaced wavelength slot 32 (k ) So that they just overlap.
  • the equally spaced wavelength slot 33 (k) in FIG. 6 is formed by overlapping the equally spaced wavelength slot 31 (k) for the downstream direction and the equally spaced wavelength slot 32 (k) for the upstream direction, This figure shows how input and output are performed.
  • the wavelength slot 34 (k) in the downlink direction has a wavelength slot width obtained by dividing the equally spaced wavelength slot 31 (k) for the downlink direction in 1.45 to: L 65 m band. This is the wavelength slot in the downward direction of ⁇ dl.
  • the upstream wavelength slot 35 (k) is formed by dividing the 1.3 m band upstream equally spaced wavelength slot 32 (k), and the upstream wavelength slot having a wavelength slot width ⁇ d2 It is.
  • the wavelength slot 34 (k) in the downstream direction and the wavelength slot 35 (k) in the upstream direction are input and output from the same input / output port due to the wavelength circulation characteristics of the recursive wavelength multiplexers 6a and 7a, and
  • the wavelength slots 33 (k) are arranged as a pair of wavelength slots.
  • the upstream and downstream wavelength slot ranges are asymmetric.
  • the requirements for the wavelength range of the plurality of subscriber side devices 3 can be relaxed, and the cost can be reduced.
  • FIG. 7 shows a plurality of m 1.45 in the third embodiment of the present invention: L 65 m band equally spaced wavelength slots 31 (1) to 31 (m) and a plurality of m of 1.3. It is a figure at the time of multiplexing the equally spaced wavelength slot 32 (1) -32 (m) of a ⁇ m band by wavelength multiplexing technology.
  • the cyclic characteristics of the cyclic wavelength multiplexers / demultiplexers 6a and 7a are used to determine the equidistant wavelength slots 31 ( Each of 1) to 31 (m) can be overlapped with each of the multiple m 1.3 ⁇ m band equally spaced wavelength slots 32 (1) to 32 (m) Arranged in equally spaced wavelength slots 33 (1) to 33 (m).
  • the plurality of m downstream wavelength slots 34 (1) to 34 (m) and the plurality of m upstream wavelength slots 35 (l) to 35 (m) each have a force of multiple m. Arranged as a pair in the equally spaced wavelength slots 33 (1) to 3 3 (m).
  • the upstream and downstream wavelength slot ranges are asymmetrical, so that the request for the wavelength ranges of the plurality of subscriber side devices 3 is required. Conditions can be relaxed and low cost is achieved.
  • the recurring wavelength multiplexer / demultiplexer 7a arranged in the middle of the transmission line includes a plurality of m equally spaced wavelength slots 31 (1) to 31 (m).
  • a function for multiplexing and demultiplexing, and a function for multiplexing and demultiplexing only the plural equally spaced wavelength slots 32 (1) to 32 (m) and 33 (1) to 33 (m). do it.
  • the circuit configuration can be greatly simplified compared to the conventional wavelength arrangement, which requires a complicated configuration combining multiple wavelength multiplexers / demultiplexers and optical power bras, resulting in lower costs and maintenance. Management work can be simplified.
  • multiplexing based on the basic configuration optical communication system in the first embodiment is performed.
  • This can be realized by using a wavelength multiplexer / demultiplexer.
  • the configuration of the cyclic wavelength multiplexer / demultiplexer can be simplified as in the wavelength multiplexer / demultiplexer of the second embodiment. As a result, the entire system can be reduced in cost and simplified maintenance management work.

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

Abstract

La présente invention concerne un système de communication optique à point/multipoint qui permet de réduire les coûts des appareils d'abonnés. Dans le système de communication optique à point/multipoint, un appareil à poste unique est connecté à une pluralité d'appareils d'abonnés par un réseau optique par le biais d'un multiplexeur/démultiplexeur en longueur d'onde et une voie de transmission à fibre optique, et chaque appareil utilise un multiplexage par répartition dans le temps ou multiplexage en longueur d'onde pour transmettre un signal optique au réseau optique. En outre, dans ce système, la longueur d'onde centrale de chacun des appareils à poste unique et de la pluralité d'appareils d'abonnés est placée dans chacun des intervalles de longueur d'onde équidistants 21, chacun ayant une largeur d'intervalle de longueur d'onde Δλd, qui est divisée en deux intervalles de longueur d'onde ayant des largeurs d'intervalle respectives Δλd1 et Δλd2, où Δλd1 + Δλd2 = Δλd et où Δλd1 ≤ Δλd2, de telle manière à ce que la longueur d'onde centrale de l'appareil à poste soit placée dans l'intervalle de longueur d'onde en aval (22) ayant la largeur d'intervalle de longueur d'onde Δλd1, tandis que la longueur d'onde centrale de chacun de la pluralité d'appareils d'abonnés est placée dans l'intervalle de longueur d'onde en amont (23) ayant la largeur d'intervalle de longueur d'onde Δλd2.
PCT/JP2006/305857 2006-03-23 2006-03-23 Systeme de communication optique a point/multipoint WO2007108126A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/JP2006/305857 WO2007108126A1 (fr) 2006-03-23 2006-03-23 Systeme de communication optique a point/multipoint
JP2008506130A JP5058972B2 (ja) 2006-03-23 2006-03-23 ポイント−マルチポイント光通信システム
TW095114842A TWI311872B (en) 2006-03-23 2006-04-26 Point to multipoint optical communication system

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PCT/JP2006/305857 WO2007108126A1 (fr) 2006-03-23 2006-03-23 Systeme de communication optique a point/multipoint

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JP2009152916A (ja) * 2007-12-21 2009-07-09 Hitachi Communication Technologies Ltd ネットワークシステム及びｏｌｔ
JP2009152914A (ja) * 2007-12-21 2009-07-09 Hitachi Communication Technologies Ltd ネットワークシステム及びｏｌｔ
JP2010098544A (ja) * 2008-10-16 2010-04-30 Nippon Telegr & Teleph Corp <Ntt> 光伝送ネットワークシステム、光伝送装置、及びそれらを用いた通過帯域割り当て方法

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