WO2020172733A1 - System for sharing signals in a given pon optical network - Google Patents
System for sharing signals in a given pon optical network Download PDFInfo
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- WO2020172733A1 WO2020172733A1 PCT/BR2020/050057 BR2020050057W WO2020172733A1 WO 2020172733 A1 WO2020172733 A1 WO 2020172733A1 BR 2020050057 W BR2020050057 W BR 2020050057W WO 2020172733 A1 WO2020172733 A1 WO 2020172733A1
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- signals
- optical fiber
- dwdm
- pon
- unidirectional
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- 239000013307 optical fiber Substances 0.000 claims abstract description 65
- 230000004931 aggregating effect Effects 0.000 claims abstract description 5
- 238000005516 engineering process Methods 0.000 claims description 56
- 230000002457 bidirectional effect Effects 0.000 claims description 40
- 230000001131 transforming effect Effects 0.000 claims description 5
- 230000002776 aggregation Effects 0.000 abstract description 7
- 238000004220 aggregation Methods 0.000 abstract description 7
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/03—WDM arrangements
- H04J14/0307—Multiplexers; Demultiplexers
-
- 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
- H04B10/25—Arrangements specific to fibre transmission
Definitions
- the present invention refers to a system developed to allow a PON optical network ("Passive Optical Network”), having only one optical fiber, of aerial or underground installation and normally already completed and in operation, can be used for the transmission, not only of the bidirectional signals of the PON technology, for example, bidirectional signals EPON, GPON, XGSPON, etc., but also unidirectional signals of the technology DWDM ("Dense Wavelenth Division Multiplexing"), being the transmission, of the referred signals, made in different and respective channels, in predetermined frequency bands.
- Passive Optical Network having only one optical fiber, of aerial or underground installation and normally already completed and in operation
- DWDM Dens Wavelenth Division Multiplexing
- the proposed system allows that a usual PON optical network, with its optical fiber providing the bidirectional transmission of signals of this technology, can be simultaneously used for bidirectional transmission of one or more of the signals of PON technologies, such as EPON, GPON, XGSPON, etc., and / or signals in DWDM technology to serve users that require only or also unidirectional signals, in a point-to-point (P2P) system.
- PON technologies such as EPON, GPON, XGSPON, etc.
- DWDM technology to serve users that require only or also unidirectional signals, in a point-to-point (P2P) system.
- Optical single-fiber PON networks are well known and used, particularly in urban centers, through which telecommunication centrals make available, to different end users and through optical power splitters, respective channels or bands of bidirectional signals traveling through the single optical fiber of these networks.
- these PON technology networks cannot be used to aggregate the transmission of technology signals Dedicated bandwidth DWDM, requiring the operator of the telecommunication services to promote the installation of new cabling with pairs of optical fibers traveling unidirectional signals in a point-to-point system, to serve users who request this type of service.
- the dedicated band technology is that of the conventional DWDM with "full-duplex" transmission on all channels and not the TWDM-PON that has a bidirectional interface, therefore being easily aggregated in a multiplexer, not requiring transformation of bidirectional signals into unidirectional and vice versa.
- the present invention aims to provide a system of signal sharing, of fast installation and of reduced cost, capable of allowing a PON optical network is used for the transmission of bidirectional signals from PON technology and unidirectional signals from DWDM technology, the transmission of said signals being made in different and respective channels in predetermined frequency bands.
- the system in question aggregation and disaggregation (withdrawal) of P2P signals on the passive PON network, allows the DWDM P2P signal (which uses two fibers, one for transmission and one for reception) to be transmitted / received by the same single fiber in the PON network and also a quick change of service from PON to P2P just by changing the equipment at each end of the network for each end user.
- Figure 1 illustrates, in a schematic and simplified way, the typical passive distribution of a PON network communicating to a telecommunication central, capable of transmitting and receiving, through an optical aggregating / disaggregating device and optical power dividers (" splitters "), bidirectional signals in PON technology and also in unidirectional DWDM P2P channels, to be used by different end users, some of which require bidirectional signals in a single optical fiber and other end users of the network requiring unidirectional signals in pair of optical fibers;
- splitters optical power dividers
- Figure 2 schematically represents the constituent elements of the optical aggregator / disintegrator device used in the communication center illustrated, for example, in figure 1;
- Figure 3 illustrates a graph containing the spectral occupation in the XGSPON (l 1 -1270nm, l 4 _1577nm), GPON (l 2 -1310nm, l 3- 1490nm) and DWDM (lc-1550nm) technologies;
- FIG. 4 schematically illustrates an interface in the form of a passive CPE P2P optical device (Customer Provider Edge Point-to-Point), comprising a selector / transformer device, connecting the PON network to a respective end user, to deliver to the latter, through an optical band pass filter, only the desired wavelength.
- band "c" in DWDM technology and transform, through an optical circulator, the bidirectional transmission PON, by single fiber, in unidirectional transmission with a fiber to transmit and a fiber to receive;
- Figure 5 represents a view similar to that of figure 4, but illustrating a constructive variant for the CPE P2P passive optical selector / transformer device, according to which the selector element, in the form of the optical bandpass filter (channel filter) , is positioned downstream of the transformer element, in the unidirectional optical fiber for receiving signals from the user;
- the selector element in the form of the optical bandpass filter (channel filter)
- Figure 6 represents a view similar to that of Figures 4 and 5, but illustrating another possible constructive variant for the CPE P2P passive optical transformer / selector device, according to which the optical bandpass filter is replaced by a multiplexer / demultiplexer device. able to separate the frequency band or channel to be made available to the end user in DWDM technology (two fibers / point-to-point) and to deliver the remaining band or bands, not yet available to other network users and in any of the technologies considered, to one or more end users; and
- Figure 7 represents a view similar to that of figure 6, but illustrating a constructive variant in which the frequency band or channels, in any of the technologies considered, remaining from the selection device of a P2P user and not yet available to other users of the network, are delivered to the same end user or to another user who receives, through a selector device, only the band available in bidirectional PON technology .
- the sharing system in question is applied to a PON optical network, formed in a single optical fiber FO which is operatively associated with a CT telecommunication central capable of transmitting and receiving, through an ADO optical aggregator / disaggregator device, commented below, bidirectional signals in PON technology, for example, GPON and XGSPON signals as illustrated, and also in unidirectional channels, for example, in DWDM P2P technology, to different end users, some users UI requiring bidirectional signals in a single optical fiber, other U2 end users of the network requiring unidirectional signals in pair of optical fibers FO and still users, as illustrated in figure 7, simultaneously requiring signals in one of the PON technologies provided by the telecommunication central CT, and signals in DWDM technology.
- PON technology for example, GPON and XGSPON signals
- unidirectional channels for example, in DWDM P2P technology
- figure 1 represents a CT telecommunication central capable of transmitting signals in the technologies illustrated and discussed above, the system in question allows the single fiber PON network to be operated with any of the PON technologies, AI includes GPON, XGSPON, etc., and DWDM technologies, simultaneously or separately, depending on users' needs end services served by the network.
- AI includes GPON, XGSPON, etc.
- DWDM technologies simultaneously or separately, depending on users' needs end services served by the network.
- the topology of the PON network is determined by the users to be served by it, and it is usually necessary to use DIV optical power dividers ("splitters"), applied in a "cascade” arrangement. , to make available to the different end users the desired optical powers and / or available according to the network topology, regardless of the technologies of the telecommunication signals provided by the CT telecommunication center.
- the single FO optical fiber of the PON network is subjected to a first optical power divider DIV, providing, for example, four divided optical fibers FO, two of which are subjected to a respective power divider. subsequent optics.
- the CT telecommunication central is equipped with an ADO optical aggregator / disintegrator device, which, as illustrated in figure 2, comprises a series of passive optical filters interconnected in order to allow the aggregation of signals from different PON technologies (provided they do not have the same wavelengths / operating color as, for example, GPON and EPON signals) and also that DWDM channels are added to provide point-to-point service dedicated to end users who need more band.
- ADO optical aggregator / disintegrator device which, as illustrated in figure 2, comprises a series of passive optical filters interconnected in order to allow the aggregation of signals from different PON technologies (provided they do not have the same wavelengths / operating color as, for example, GPON and EPON signals) and also that DWDM channels are added to provide point-to-point service dedicated to end users who need more band.
- passive optical filters are formed by passive optical MUX / DEMUX multiplexer / demultiplexers 1, 2, 3, 4 and 5 that route optical signals according to their wavelength (color), it should be noted that the terms MUX or DEMUX are inherent to the action that the device is performing on the optical signal and not to the device itself. Both the MUX device and the DEMUX device are constructively identical.
- this device When the optical device aggregates two or more wavelengths (colors) of two or more fibers in a single fiber, this device has the function of MUX multiplexer. Otherwise, if the device disaggregates several signals of different wavelengths of a fiber into two or more fibers, each with one or more wavelengths, this device has the DEMUX demultiplexer function, and, in any case, a MUX-DEMUX device can perform both operations simultaneously, including.
- the MUX-DEMUX 1, 2 and 3 devices are provided that have the dual function of operation, while the DEMUX-4 and MUX-5 devices have only one operation function, the first being demultiplexing and the other multiplexing.
- the telecommunication center CT has a first PON 8 interface of bidirectional signals with wavelengths (l 2 + l 3) , a second PON 9 interface of bidirectional signals with wavelengths (l 1 + l 4) and the DWDM interfaces 10 and 11 of unidirectional signals with respective wavelengths lcD1, lcD2, lcD3, lcD4 .... lcDN and lcM1, lcM2, lcM3, lcM4 bib lcMN.
- this arrangement represents only an exemplary possibility that can be used, for example, for GPON and XGSPON, which use bands with this frequency.
- Figure 2 shows the spectral occupation of GPON
- the function of the MUX-DEMUX 1 is to aggregate the signals that will be sent to the single FO optical fiber of the PON network, coming from the first PON 8 interface, the second PON 9 interface and the DWDM 10 and 11 interfaces of the exchange telecommunication network.
- the MUX-DEMUX 1 device exemplified in figure 2, has ports l 1 , l 2 , l 3 , l 4 and l c .
- the MUX-DEMUX 2 device separates bands from the first PON 8 interface.
- the MUX-DEMUX 3 device has the same function, but for the second PON 9 interface.
- the system allows as many PON interfaces (ports) to be used as are required by the users to be served by the network.
- interfaces obviously have to operate at different wavelengths (l 1 # l 2 # l 3 #l 4 #l c) .
- GPON and EPON interfaces cannot be used on the same equipment, as both share the same operating wavelengths (1490nm for downstream and 1310nm for upstream), but GPON / EPON can be used with XGSPON.
- XGSPON has different wavelengths than GPON / EPON (1270nm upstream and 1577nm for downstream).
- the DWDM 10 and 11 interfaces have their own wavelength, with a band at 1550nm (known as band C or l c) .
- This band is outside the bands used in PON technology. Therefore, signals in DWDM technology do not interfere or are not interfered with by PON technology signals.
- the C band of the DWDM technology appears, in figure 2, with greater width due to the fact that within the C band, up to 40 DWDM channels can be accommodated, with 100GHz spacing or 80 channels with 50GHz spacing.
- the DWDM channels available in the port group from the DWDM 11 interface are multiplexed in the MUX-5 device, while the DEMUX-4 demultiplexer device receives the signals from the C band and delivers them to their respective channels in the port group of interface 10 of the CT telecommunication center.
- Both the signals coming from the MUX-5 device and the signals delivered in the DEMUX-4 device pass through a transformer device DT, in the form of an optical circulator 6, which has the function of transforming the bidirectional signals on the PON side, to unidirectional signals in the side of the DWDM interface and vice versa.
- the transformer device DT defined by optical circulator 6, operates in the following way: the unidirectional signal from the DWDM 11 interface of the telecommunication central CT that reaches optical circulator 6 by "a”, can only leave it by "b” , in the form of a bidirectional signal on the PON side; the bidirectional signal coming from the MUX-DEMUX 1 device on the PON side and reaching the optical circulator 6 by "b”, can only come out of it by "c”, in the form of a unidirectional signal directed to the DEMUX-4 device.
- the unidirectional signal coming from the MUX-5 device enters the optical circulator 6 by "a” and exits by "b", to be delivered to the MUX-DEMUX 1 device, which, in turn, delivered to the PON line with the single FO optical fiber, also illustrated in figure 1 as being addressed to the first DIV optical splitter.
- the transformer device DT in the form of an optical circulator 6 or an optical coupler / decoupler or optical divider (not shown), which performs the same function, but with a significant loss in signal strength (greater than 3dB ) in both directions, of aggregation and disaggregation.
- Optical circulator 6 on the other hand, has a very low insertion loss (less than ldB) and is more suitable for the low insertion loss of the ADO optical aggregator / disintegrator device in the user's network.
- the provision of the ADO optical aggregator / disintegrator device in the CT telecommunication center allows telecommunication signals of different technologies to be aggregated to a PON technology network, for example, the aggregation of several channels of unidirectional DWDM signals ( 4, 8, 16, etc. channels) to the PON network, including bidirectional channels in EPON, GPON, XGSPON technologies, etc. These signals are sent across the entire PON network and reach all end points (end users U1, U2).
- a ONU / ONT that is, a DS separator device usually in the form of an optical filter bandpass, channel filter 13, as shown at the bottom of figure 7, to free that user the channel or band in PON technology.
- the DS separator device of these ONUs / ONTs in the form of an optical filter, removes all signals from other technologies and allows only the signal of the appropriate "color" (wavelength) to pass through PON technology in this example of configuration of figure 7.
- an interface that filters only the desired channel in the technology must be installed, between the optical point and the final equipment (usually a Switch).
- the U2 end user To receive a desired dedicated channel in DWDM technology from the PON optical network, the U2 end user must have the optical interface of his telecommunication equipment, operatively coupled to a DST selector / transformer device, in the form of a passive optical device.
- CPE P2P Customer Provider Edge Point-to-Point
- FIG. 4 and 5 which is specific to the desired channel and which converts the signal from one fiber (bidirectional) to two fibers (unidirectional), to deliver the unidirectional signals to the U2 optical end-user interface.
- the DST selector / transformer device illustrated in figures 4 and 5, is installed on the end user who wants to be served by means of a dedicated channel, the said device being able to make available to said end user U2, only the length wave (color / channel) of the DWDM band "c" that the operator provides for that user.
- This DST selector / transformer device also has the ability to transform the bidirectional signals received by the single FO fiber optic from the PON network into unidirectional signals desired by the end user U2.
- the DST selector / transformer device comprises a DS selector device, for example, in the form of an optical bandpass type 13 channel filter that receives all signals made available on optical fiber FO from the telecommunication central CT and which releases only one passing band in the wavelength (channel) of DWDM to be delivered to the end user U2, the band or band being passed through the channel filter 13, conducted to a port "b" of a transformer device DT, generally defined by an optical circulator 14 which is operatively associated with the two ports of the end user interface U2, one receiving port 15 and the other sending port 16 of unidirectional signals.
- a DS selector device for example, in the form of an optical bandpass type 13 channel filter that receives all signals made available on optical fiber FO from the telecommunication central CT and which releases only one passing band in the wavelength (channel) of DWDM to be delivered to the end user U2, the band or band being passed through the channel filter 13, conducted to a port "b" of a transformer device DT, generally defined by an optical circulator 14 which is operatively associated
- any unwanted signal (l 1 , l 2 , l 3 , l 4 , l CN) is eliminated by the channel filter 13. Only the desired channel N of the DWDM enters port “b" of the optical circulator 14, being that the signal released by port “c” of the latter is directed to receiving port 15 of the DWDM interface of the end user U2.
- the signal emitted by the emission port 16 of the DWDM interface of the end user U2 (in the desired color N) is directed to port "a" of optical circulator 14 which delivers it to port "b".
- This unidirectional signal, emitted by the end user interface U2 then passes through the channel filter 13 and is conducted to the optical fiber FO of the PON network.
- the DST selector / transformer device in the form of a passive CPE P2P optical device, can be further defined as shown in figure 5, also in the form of a DS separator device, with the same construction and functionality as those of the illustrated device in figure 4, except that the channel filter 13 is positioned between the optical circulator 14 and the receiving port 15 of the DWDM interface of the final client U2. Since the reception detectors of the DWDM user interface final U2 require filtering only of the corresponding channel (as they are broadband and sensitive to practically all useful telecommunications optical band), the version of figure 5 only filters the reception of the signals, with no need for filtering in the transmission, as this takes place only on the desired channel and used by the respective end user U2.
- the advantage of the version in figure 4 is the security that a different color interface to that of the CPE P2P is prevented from being coupled to the PON network (due to a user commissioning error).
- the advantage of the version of figure 5 is the lower insertion loss in the transmission of the P2P signal (point to point).
- Figure 6 illustrates a third constructive possibility for the DST selector / transformer device, also in the form of a passive CPE P2P optical device, in which case it takes the form of a DST selector / transformer device with the filter of channel 13, of the constructions of figures 4 and 5, being replaced by a selector device DS-17 in the form of a multiplexer-demultiplexer MUX-DEMUX, which has the function of separating the channel cN for the end user U2 P2P (as well as the channel filter 13 in the versions of figures 4 and 5) of the rest of the bands available on the PON network.
- a selector device DS-17 in the form of a multiplexer-demultiplexer MUX-DEMUX
- the selector device DS-17 (MUX-DEMUX) operates in conjunction with a transformer device DT in the form of an optical circulator 14 whose function is the same as that described for optical circulator 14 of figures 4 and 5. Unlike the channel filter 13, unwanted bands are not eliminated, but released on FOC continuation optical fiber containing all (channel) PON wavelengths and all wavelengths of DWDM, except the cN channel which is used by the local user. With this version, it is possible to cascade CPE P2P or even connect a ONU / ONT PON, that is, a DS selector device, usually in the form of an optical bandpass filter, on the FOC continuation optical fiber, as illustrated in bottom of figure 7, to release the channel or band using PON technology to the respective user.
- a ONU / ONT PON that is, a DS selector device, usually in the form of an optical bandpass filter, on the FOC continuation optical fiber, as illustrated in bottom of figure 7, to release the channel or band using PON technology to the respective user.
- the signal delivered to the passive optical device CPE P2P which takes the form of a DST selector / transformer device, received from the optical fiber FO of the PON network, is filtered by the selector device DS 17, in the form of a multiplexer-demultiplexer MUX-DEMUX that replaces the channel filter 13 of the constructions in figures 4 and 5 and that operates in conjunction with a transformer device DT, in the form of an optical circulator 14 whose function is the same as that described for the circulator optical 14 of figures 4, 5 and 6.
- the desired color (channel or band) for this end user U2 is removed and inserted by an optical interface 21 DWDM coupled to a Switch / SDH / TDM 20 of the user.
- the other DWDM and PON wavelengths are routed through a FOC continuation optical fiber and delivered to the same user or another user who requires a PON technology channel or band present in the FOC continuation optical fiber.
- each passive CPE P2P optical device must be of a different model, each mounted with a DS-17 (MUX-DEMUX) separating device corresponding to the channel to be used locally and, in the same way Therefore, the optical interfaces 21 mounted on the switches 20 of the U2 end user (can be DWDM SFP, SFP +, XFP interfaces, etc.) must have the "colors" (channels or bands) of the respective passive CPE P2P optical device.
- the system in question allows the use of passive PON network, of great granularity, to provide point-to-point service of dedicated band, that is, that the operator has a mixed network PON / Packages in the same infrastructure , using fully passive equipment, low cost CPE P2P passive optical devices and the use of conventional DWDM interfaces that can be coupled to large capacity switches or TDM equipment (SDH, PDH, SONET).
- the system in question allows the operator to have a mixed PON / Packages network in the same infrastructure.
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Abstract
Description
"SISTEMA DE COMPARTILHAMENTO DE SINAIS EM UMA MESMA REDE"SIGNAL SHARING SYSTEM IN THE SAME NETWORK
ÓPTICA PON" PON OPTICS "
Campo da invenção Field of invention
[001] Refere-se a presente invenção a um sistema desenvolvido para permitir que uma rede óptica PON ("Passive Optical Network"), tendo apenas uma fibra óptica, de instalação aérea ou subterrânea e normalmente já concluída e em operação, possa ser utilizada para a transmissão, não só dos sinais bidirecionais da tecnologia PON como, por exemplo, sinais bidirecionais EPON, GPON, XGSPON, etc., mas também sinais unidirecionais da tecnologia DWDM ("Dense Wavelenth Division Multiplexing" ) , sendo a transmissão, dos referidos sinais, feita em diferentes e respectivos canais, em bandas de frequência predeterminadas. [001] The present invention refers to a system developed to allow a PON optical network ("Passive Optical Network"), having only one optical fiber, of aerial or underground installation and normally already completed and in operation, can be used for the transmission, not only of the bidirectional signals of the PON technology, for example, bidirectional signals EPON, GPON, XGSPON, etc., but also unidirectional signals of the technology DWDM ("Dense Wavelenth Division Multiplexing"), being the transmission, of the referred signals, made in different and respective channels, in predetermined frequency bands.
[002] O sistema ora proposto permite que uma usual rede óptica PON, com sua fibra óptica provendo a transmissão bidirecional de sinais dessa tecnologia, possa ser simultaneamente utilizada para transmissão bidirecional de um ou mais dos sinais das tecnologias PON, como EPON, GPON, XGSPON, etc., e/ou de sinais na tecnologia DWDM para atender usuários que requeiram apenas ou também sinais unidirecionais, em sistema ponto a ponto (P2P) . [002] The proposed system allows that a usual PON optical network, with its optical fiber providing the bidirectional transmission of signals of this technology, can be simultaneously used for bidirectional transmission of one or more of the signals of PON technologies, such as EPON, GPON, XGSPON, etc., and / or signals in DWDM technology to serve users that require only or also unidirectional signals, in a point-to-point (P2P) system.
Antecedentes da invenção Background of the invention
[003] São bem conhecidas e utilizadas, particularmente nos centros urbanos, as redes ópticas PON de uma só fibra óptica, por meio das quais as centrais de telecomunicação disponibilizam, a diferentes usuários finais e por meio de divisores de potência óptica, respectivos canais ou bandas de sinais bidirecionais trafegando pela fibra óptica única dessas redes. [004] Apesar de suprirem as necessidades de usuários que requeiram serviços de telecomunicação em menor banda de dados, com sinais bidirecionais (trafegando em uma só fibra óptica) , essas redes de tecnologia PON não podem ser usadas para agregarem a transmissão de sinais de tecnologia DWDM de banda dedicada, exigindo que a operadora dos serviços de telecomunicação promova a instalação de novo cabeamento com pares de fibras ópticas trafegando sinais unidirecionais em sistema ponto a ponto, para atender os usuários que solicitarem esse tipo de serviço. [003] Optical single-fiber PON networks are well known and used, particularly in urban centers, through which telecommunication centrals make available, to different end users and through optical power splitters, respective channels or bands of bidirectional signals traveling through the single optical fiber of these networks. [004] Despite meeting the needs of users who require telecommunication services in a smaller data band, with bidirectional signals (traveling on a single optical fiber), these PON technology networks cannot be used to aggregate the transmission of technology signals Dedicated bandwidth DWDM, requiring the operator of the telecommunication services to promote the installation of new cabling with pairs of optical fibers traveling unidirectional signals in a point-to-point system, to serve users who request this type of service.
[005] Ocorre que, muitas vezes, a instalação de novo cabeamento enfrenta dificuldades que tornam essa solução inviável. Dentre as dificuldades da provisão de novo cabeamento, podem ser citados o custo de instalação e aluguel de ocupação de postes, aspectos esses que se constituem em importantes fatores negativos, mas que, em muitos casos, são superados pelo problema da saturação de uso de postes nas instalações aéreas. As companhias de energia elétrica estabelecem limites de ocupação de postes e, nas grandes cidades, esse limite é rapidamente atingido, impossibilitando novas ocupações. [005] It happens that, many times, the installation of new cabling faces difficulties that make this solution unfeasible. Among the difficulties in the provision of new cabling, the cost of installing and renting poles can be mentioned, aspects that constitute important negative factors, but which, in many cases, are overcome by the problem of saturation of pole use. on the air facilities. Electricity companies set limits for the occupation of poles and, in large cities, this limit is quickly reached, making new occupations impossible.
[006] Apesar de as tecnologias PON e DWDM já estarem estabelecidas no mercado, com a tecnologia DWDM tendo largo uso no provisionamento de banda dedicada e ultra larga, não são conhecidas soluções capazes de agregar essas duas tecnologias em uma rede óptica PON. Nos conhecidos equipamentos que agregam tecnologias PON diferentes, tais como GPON/EPON com XGPON e até com TWDM-PON, essas agregações não incluem a tecnologia DWDM de banda dedicada, sendo que a agregação das referidas tecnologias GPON/EPON com XGPON e com TWDM-PON (tratado neste invento) , utiliza equipamentos de elevado custo, com arquitetura de operação mais parecida com PON. A tecnologia de banda dedicada, considerada na presente invenção, é a do DWDM convencional com transmissão "full- duplex" em todos os canais e não o TWDM-PON que possui interface bidirecional, sendo, portanto, facilmente agregado em um multiplexador, não requerendo transformação de sinais bidirecionais em unidirecionais e vice-versa. [006] Although PON and DWDM technologies are already established in the market, with DWDM technology having wide use in the provision of dedicated and ultra wide band, there are no known solutions capable of aggregating these two technologies in a PON optical network. In the well-known equipment that aggregates different PON technologies, such as GPON / EPON with XGPON and even with TWDM-PON, these aggregations do not include dedicated band DWDM technology, and the aggregation of the referred GPON / EPON technologies with XGPON and with TWDM-PON (treated in this invention), uses high cost equipment, with operating architecture more similar to PON. The dedicated band technology, considered in the present invention, is that of the conventional DWDM with "full-duplex" transmission on all channels and not the TWDM-PON that has a bidirectional interface, therefore being easily aggregated in a multiplexer, not requiring transformation of bidirectional signals into unidirectional and vice versa.
[007] Diante das dificuldades acima citadas, passa a ser desejável a provisão de um sistema que ofereça serviços de telecomunicação em canais da tecnologia DWDM de banda dedicada, utilizando a usual grande capilaridade de uma rede óptica passiva de tecnologia PON, sem exigir a instalação de novo cabeamento e contornando o problema de remoção e inserção de canal na ponta do lado usuário final na rede. Sumário da invenção [007] In view of the aforementioned difficulties, it is now desirable to provide a system that offers telecommunication services on dedicated band DWDM technology channels, using the usual great capillarity of a passive optical network using PON technology, without requiring installation new cabling and bypassing the problem of removing and inserting the channel at the end of the end user side in the network. Summary of the invention
[008] Considerando as limitações das redes ópticas PON e as dificuldades e custos envolvidos na instalação de novas fibras ópticas bidirecionais nas tecnologias EPON, GPON, XGSPON, etc. e/ou de novas fibras ópticas unidirecionais, em sistema ponto a ponto, na tecnologia DWDM, a presente invenção tem o objetivo de prover um sistema de compartilhamento de sinais, de instalação rápida e de custo reduzido, capaz de permitir que uma rede óptica PON seja utilizada para a transmissão de sinais bidirecionais da tecnologia PON e sinais unidirecionais da tecnologia DWDM, sendo a transmissão, dos referidos sinais, feita em diferentes e respectivos canais em bandas de frequência predeterminadas . [008] Considering the limitations of PON optical networks and the difficulties and costs involved in the installation of new bi-directional optical fibers in EPON, GPON, XGSPON technologies, etc. and / or new unidirectional optical fibers, in a point-to-point system, in DWDM technology, the present invention aims to provide a system of signal sharing, of fast installation and of reduced cost, capable of allowing a PON optical network is used for the transmission of bidirectional signals from PON technology and unidirectional signals from DWDM technology, the transmission of said signals being made in different and respective channels in predetermined frequency bands.
O sistema em questão, de agregação e desagregação (retirada) de sinais P2P na rede passiva PON, permite que o sinal DWDM P2P (que utiliza duas fibras, uma para transmissão e outra para recepção) seja transmitido/recebido pela mesma fibra única da rede PON e ainda uma rápida mudança de serviço de PON para P2P apenas com a troca do equipamento de cada ponta da rede em cada usuário final. The system in question, aggregation and disaggregation (withdrawal) of P2P signals on the passive PON network, allows the DWDM P2P signal (which uses two fibers, one for transmission and one for reception) to be transmitted / received by the same single fiber in the PON network and also a quick change of service from PON to P2P just by changing the equipment at each end of the network for each end user.
Breve descrição dos desenhos Brief description of the drawings
[009] O sistema em questão será descrito a seguir, fazendo-se referência aos desenhos anexos, dados a titulo exemplificativo e nos quais: [009] The system in question will be described below, making reference to the attached drawings, given by way of example and in which:
[010] A figura 1 ilustra, de modo esquemático e simplificado, a distribuição passiva tipica de uma rede PON comunicando uma central de telecomunicação, capaz de transmitir e receber, através de um dispositivo agregador/desagregador óptico e de divisores de potência óptica ( " splitters " ) , sinais bidirecionais na tecnologia PON e também em canais unidirecionais DWDM P2P, a serem usados por diferentes usuários finais, alguns deles requerendo sinais bidirecionais em uma só fibra óptica e outros usuários finais da rede requerendo sinais unidirecionais em par de fibras ópticas; [010] Figure 1 illustrates, in a schematic and simplified way, the typical passive distribution of a PON network communicating to a telecommunication central, capable of transmitting and receiving, through an optical aggregating / disaggregating device and optical power dividers (" splitters "), bidirectional signals in PON technology and also in unidirectional DWDM P2P channels, to be used by different end users, some of which require bidirectional signals in a single optical fiber and other end users of the network requiring unidirectional signals in pair of optical fibers;
[011] A figura 2 representa, esquematicamente, os elementos constitutivos do dispositivo agregador/desagregador óptico utilizado na central de comunicação ilustrada, exemplificativamente, na figura 1; [011] Figure 2 schematically represents the constituent elements of the optical aggregator / disintegrator device used in the communication center illustrated, for example, in figure 1;
[012] A figura 3 ilustra um gráfico contendo a ocupação espectral nas tecnologias XGSPON (l1-1270nm, l4_1577nm) , GPON (l2-1310nm,l 3-1490nm) e DWDM (lc-1550nm) ; [012] Figure 3 illustrates a graph containing the spectral occupation in the XGSPON (l 1 -1270nm, l 4 _1577nm), GPON (l 2 -1310nm, l 3- 1490nm) and DWDM (lc-1550nm) technologies;
[013] A figura 4 ilustra, de modo esquemático, uma interface na forma de um dispositivo óptico passivo CPE P2P (Customer Provider Edge Point-to-Point) , compreendendo um dispositivo seletor/transformador, conectando a rede PON a um respectivo usuário final, para entregar a esse último, por meio de um filtro passa faixa óptico, somente o comprimento de onda da desejada banda "c" na tecnologia DWDM, e transformar, por um circulador óptico, a transmissão bidirecional PON, por fibra única, em transmissão unidirecional com uma fibra para transmitir e uma fibra para receber; [013] Figure 4 schematically illustrates an interface in the form of a passive CPE P2P optical device (Customer Provider Edge Point-to-Point), comprising a selector / transformer device, connecting the PON network to a respective end user, to deliver to the latter, through an optical band pass filter, only the desired wavelength. band "c" in DWDM technology, and transform, through an optical circulator, the bidirectional transmission PON, by single fiber, in unidirectional transmission with a fiber to transmit and a fiber to receive;
[014] A figura 5 representa uma vista similar àquela da figura 4, mas ilustrando uma variante construtiva para o dispositivo seletor/transformador óptico passivo CPE P2P, segundo a qual o elemento seletor, na forma do filtro passa faixa óptico (filtro de canal) , é posicionado a jusante do elemento transformador, na fibra óptica unidirecional de recebimento dos sinais no usuário; [014] Figure 5 represents a view similar to that of figure 4, but illustrating a constructive variant for the CPE P2P passive optical selector / transformer device, according to which the selector element, in the form of the optical bandpass filter (channel filter) , is positioned downstream of the transformer element, in the unidirectional optical fiber for receiving signals from the user;
[015] A figura 6 representa uma vista similar àquela das figuras 4 e 5, mas ilustrando outra possivel variante construtiva para o dispositivo seletor/transformador óptico passivo CPE P2P, segundo a qual o filtro passa faixa óptico é substituído por um dispositivo multiplexador/demultiplexador capaz de separar a banda ou canal de frequência a ser disponibilizado ao usuário final na tecnologia DWDM (duas fibras/ponto-a-ponto) e de entregar a ou as bandas remanescentes, ainda não disponibilizadas a outros usuários da rede e em qualquer das tecnologias consideradas, a um ou mais usuários finais; e [015] Figure 6 represents a view similar to that of Figures 4 and 5, but illustrating another possible constructive variant for the CPE P2P passive optical transformer / selector device, according to which the optical bandpass filter is replaced by a multiplexer / demultiplexer device. able to separate the frequency band or channel to be made available to the end user in DWDM technology (two fibers / point-to-point) and to deliver the remaining band or bands, not yet available to other network users and in any of the technologies considered, to one or more end users; and
[016] A figura 7 representa uma vista similar àquela da figura 6, mas ilustrando uma variante construtiva na qual a ou as bandas ou canais de frequência, em qualquer das tecnologias consideradas, remanescentes do dispositivo seletor de um usuário P2P e ainda não disponibilizadas a outros usuários da rede, são entregues a um mesmo usuário final ou a outro usuário que recebe, por meio de um dispositivo seletor, apenas a banda disponível na tecnologia bidirecional PON. [016] Figure 7 represents a view similar to that of figure 6, but illustrating a constructive variant in which the frequency band or channels, in any of the technologies considered, remaining from the selection device of a P2P user and not yet available to other users of the network, are delivered to the same end user or to another user who receives, through a selector device, only the band available in bidirectional PON technology .
Descrição da invenção Description of the invention
[017] Conforme ilustrado nos desenhos, particularmente na figura 1, o sistema de compartilhamento em questão é aplicado a uma rede óptica PON, formada em uma só fibra óptica FO que é operativamente associada a uma central de telecomunicação CT capaz de transmitir e receber, através de um dispositivo agregador/desagregador óptico ADO, comentado adiante, sinais bidirecionais na tecnologia PON, por exemplo, sinais GPON e XGSPON conforme ilustrado, e também em canais unidirecionais, por exemplo, na tecnologia DWDM P2P, a diferentes usuários finais, alguns usuários UI requerendo sinais bidirecionais em uma só fibra óptica, outros usuários finais U2 da rede requerendo sinais unidirecionais em par de fibras ópticas FO e ainda usuários, conforme ilustrado na figura 7, requerendo, simultaneamente, sinais em uma das tecnologias PON disponibilizadas pela central de telecomunicação CT, e sinais na tecnologia DWDM. [017] As illustrated in the drawings, particularly in figure 1, the sharing system in question is applied to a PON optical network, formed in a single optical fiber FO which is operatively associated with a CT telecommunication central capable of transmitting and receiving, through an ADO optical aggregator / disaggregator device, commented below, bidirectional signals in PON technology, for example, GPON and XGSPON signals as illustrated, and also in unidirectional channels, for example, in DWDM P2P technology, to different end users, some users UI requiring bidirectional signals in a single optical fiber, other U2 end users of the network requiring unidirectional signals in pair of optical fibers FO and still users, as illustrated in figure 7, simultaneously requiring signals in one of the PON technologies provided by the telecommunication central CT, and signals in DWDM technology.
[018] Apesar de a figura 1 representar uma central de telecomunicação CT com capacidade de transmissão de sinais nas tecnologias ilustradas e acima comentadas, o sistema em questão permite que a rede PON de uma só fibra possa ser operada com qualquer uma das tecnologias PON, ai incluidas as tecnologias GPON, XGSPON, etc., e DWDM, simultaneamente ou separadamente, dependendo das necessidades dos usuários finais servidos pela rede. [018] Although figure 1 represents a CT telecommunication central capable of transmitting signals in the technologies illustrated and discussed above, the system in question allows the single fiber PON network to be operated with any of the PON technologies, AI includes GPON, XGSPON, etc., and DWDM technologies, simultaneously or separately, depending on users' needs end services served by the network.
[019] Conforme exemplificativamente ilustrado na figura 1, a topologia da rede PON é determinada pelos usuários a serem por ela servidos, sendo usualmente necessária a utilização de divisores de potência óptica DIV ( " splitters " ) , aplicados em uma disposição em "cascata", para disponibilizar, aos diferentes usuários finais, as potências ópticas desejadas e/ou disponíveis de acordo com a topologia da rede, independentemente das tecnologias dos sinais de telecomunicação disponibilizadas pela central de telecomunicação CT . No exemplo de topologia ilustrado na figura 1, a fibra óptica única FO da rede PON é submetida a um primeiro divisor de potência óptica DIV, provendo, por exemplo, quatro fibras ópticas divididas FO, duas das quais são submetidas a um respectivo divisor de potência óptica subsequente . [019] As exemplarily illustrated in figure 1, the topology of the PON network is determined by the users to be served by it, and it is usually necessary to use DIV optical power dividers ("splitters"), applied in a "cascade" arrangement. , to make available to the different end users the desired optical powers and / or available according to the network topology, regardless of the technologies of the telecommunication signals provided by the CT telecommunication center. In the topology example illustrated in Figure 1, the single FO optical fiber of the PON network is subjected to a first optical power divider DIV, providing, for example, four divided optical fibers FO, two of which are subjected to a respective power divider. subsequent optics.
[020] Para que o sistema realize sua função operacional, a central de telecomunicação CT é provida de um dispositivo agregador/desagregador óptico ADO que, conforme ilustrado na figura 2, compreende uma série de filtros ópticos passivos interligados de forma a permitir a agregação de sinais de diversas tecnologias PON (desde que não possuam os mesmos comprimentos de onda/cor de operação como, por exemplo, sinais GPON e EPON) e também que sejam agregados canais DWDM para prover serviço ponto a ponto dedicado a usuários finais que necessitem de mais banda. [020] In order for the system to perform its operational function, the CT telecommunication central is equipped with an ADO optical aggregator / disintegrator device, which, as illustrated in figure 2, comprises a series of passive optical filters interconnected in order to allow the aggregation of signals from different PON technologies (provided they do not have the same wavelengths / operating color as, for example, GPON and EPON signals) and also that DWDM channels are added to provide point-to-point service dedicated to end users who need more band.
[021] Na construção ilustrada, os filtros ópticos passivos são formados por dispositivos multiplexadores/demultiplexadores MUX/DEMUX ópticos passivos 1, 2, 3, 4 e 5 que roteiam sinais ópticos em função de seu comprimento de onda (cor) , devendo ser observado que os termos MUX ou DEMUX são inerentes à ação que o dispositivo está executando no sinal óptico e não ao dispositivo em si. Tanto o dispositivo MUX como o dispositivo DEMUX são construtivamente idênticos. [021] In the illustrated construction, passive optical filters are formed by passive optical MUX / DEMUX multiplexer / demultiplexers 1, 2, 3, 4 and 5 that route optical signals according to their wavelength (color), it should be noted that the terms MUX or DEMUX are inherent to the action that the device is performing on the optical signal and not to the device itself. Both the MUX device and the DEMUX device are constructively identical.
[022] Quando o dispositivo óptico agrega dois ou mais comprimentos de onda (cores) de duas ou mais fibras em uma única fibra, este dispositivo tem a função de multiplexador MUX. De outra forma, se o dispositivo desagrega vários sinais de comprimentos de onda diferentes de uma fibra em duas ou mais fibras, cada uma com um ou mais comprimentos de onda, este dispositivo tem a função de demultiplexador DEMUX, sendo que, de qualquer forma, um dispositivo MUX-DEMUX pode executar as duas operações, simultaneamente inclusive. [022] When the optical device aggregates two or more wavelengths (colors) of two or more fibers in a single fiber, this device has the function of MUX multiplexer. Otherwise, if the device disaggregates several signals of different wavelengths of a fiber into two or more fibers, each with one or more wavelengths, this device has the DEMUX demultiplexer function, and, in any case, a MUX-DEMUX device can perform both operations simultaneously, including.
[023] No exemplo da figura 2, são providos os dispositivos MUX-DEMUX 1, 2 e 3 que têm a função dupla de operação, enquanto que os dispositivos DEMUX-4 e MUX-5 têm apenas uma função de operação, sendo a primeira de demultiplexação e a outra de multiplexação . Nesse exemplo, a central de telecomunicação CT tem uma primeira interface PON 8 de sinais bidirecionais com comprimentos de onda (l2+ l3) , uma segunda interface PON 9 de sinais bidirecionais com comprimentos de onda (l1+l 4) e as interfaces DWDM 10 e 11 de sinais unidirecionais com respectivos comprimentos de onda lcD1, lcD2, lcD3, lcD4.... lcDN e lcM1, lcM2, lcM3, lcM4..... lcMN. Deve ser entendido que esse arranjo representa apenas uma possibilidade exemplificativa que pode ser utilizada, por exemplo, para GPON e XGSPON, que utilizam bandas com esta frequência. A figura 2 mostra a ocupação espectral de GPON,[023] In the example in figure 2, the MUX-DEMUX 1, 2 and 3 devices are provided that have the dual function of operation, while the DEMUX-4 and MUX-5 devices have only one operation function, the first being demultiplexing and the other multiplexing. In this example, the telecommunication center CT has a first PON 8 interface of bidirectional signals with wavelengths (l 2 + l 3) , a second PON 9 interface of bidirectional signals with wavelengths (l 1 + l 4) and the DWDM interfaces 10 and 11 of unidirectional signals with respective wavelengths lcD1, lcD2, lcD3, lcD4 .... lcDN and lcM1, lcM2, lcM3, lcM4 ..... lcMN. It should be understood that this arrangement represents only an exemplary possibility that can be used, for example, for GPON and XGSPON, which use bands with this frequency. Figure 2 shows the spectral occupation of GPON,
XGSPON e DWDM . [024] O dispositivo MUX-DEMUX 1 tem, como função, agregar os sinais que serão enviados à fibra óptica FO única da rede PON, advindos da primeira interface PON 8, da segunda interface PON 9 e das interfaces DWDM 10 e 11 da central de telecomunicação CT . Assim, o dispositivo MUX-DEMUX 1, exemplificado na figura 2, apresenta as portas l1, l2, l3, l4e lc . O dispositivo MUX-DEMUX 2 faz a separação de bandas da primeira interface PON 8. O dispositivo MUX-DEMUX 3 tem a mesma função, porém para a segunda interface PON 9. XGSPON and DWDM. [024] The function of the MUX-DEMUX 1 is to aggregate the signals that will be sent to the single FO optical fiber of the PON network, coming from the first PON 8 interface, the second PON 9 interface and the DWDM 10 and 11 interfaces of the exchange telecommunication network. Thus, the MUX-DEMUX 1 device, exemplified in figure 2, has ports l 1 , l 2 , l 3 , l 4 and l c . The MUX-DEMUX 2 device separates bands from the first PON 8 interface. The MUX-DEMUX 3 device has the same function, but for the second PON 9 interface.
[025] O sistema permite que sejam utilizadas tantas interfaces (portas) PON quantas forem requeridas pelos usuários a serem servidos pela rede. Entretanto, as interfaces têm que, obviamente, operar com comprimentos de onda diferentes (l1 # l 2 # l 3 #l 4 #l c) . Por exemplo, não podem ser utilizadas interfaces GPON e EPON no mesmo equipamento, pois ambas compartilham os mesmos comprimentos de onda de operação (1490nm para downstream e 1310nm para upstream) , mas podem ser utilizados GPON / EPON com XGSPON. O XGSPON possui comprimentos de onda diferentes do GPON / EPON (1270nm upstream e 1577nm para downstream) . [025] The system allows as many PON interfaces (ports) to be used as are required by the users to be served by the network. However, interfaces obviously have to operate at different wavelengths (l 1 # l 2 # l 3 #l 4 #l c) . For example, GPON and EPON interfaces cannot be used on the same equipment, as both share the same operating wavelengths (1490nm for downstream and 1310nm for upstream), but GPON / EPON can be used with XGSPON. XGSPON has different wavelengths than GPON / EPON (1270nm upstream and 1577nm for downstream).
[026] As interfaces DWDM 10 e 11 possuem comprimento de onda próprio, com banda em 1550nm (conhecida como banda C ou lc) . Esta banda fica fora das bandas utilizadas em tecnologia PON. Portanto, os sinais na tecnologia DWDM não interferem ou não sofrem interferência dos sinais de tecnologia PON. A banda C da tecnologia DWDM aparece, na figura 2, com largura maior em razão do fato de dentro da banda C poderem ser acomodados até 40 canais DWDM, com espaçamento de 100GHz ou 80 canais com espaçamento de 50GHz. [026] The DWDM 10 and 11 interfaces have their own wavelength, with a band at 1550nm (known as band C or l c) . This band is outside the bands used in PON technology. Therefore, signals in DWDM technology do not interfere or are not interfered with by PON technology signals. The C band of the DWDM technology appears, in figure 2, with greater width due to the fact that within the C band, up to 40 DWDM channels can be accommodated, with 100GHz spacing or 80 channels with 50GHz spacing.
[027] Os canais DWDM disponibilizados no grupo de portas da interface DWDM 11 são multiplexados no dispositivo MUX-5, enquanto o dispositivo demultiplexador DEMUX-4 recebe os sinais da banda C e os entrega aos seus respectivos canais no grupo de portas da interface 10 da central de telecomunicação CT. Tanto os sinais advindos do dispositivo MUX-5 como os sinais entregues no dispositivo DEMUX-4 passam por um dispositivo transformador DT, na forma de um circulador óptico 6, que tem a função de transformar os sinais bidirecionais do lado PON, para sinais unidirecionais no lado da interface DWDM e vice e versa. [027] The DWDM channels available in the port group from the DWDM 11 interface are multiplexed in the MUX-5 device, while the DEMUX-4 demultiplexer device receives the signals from the C band and delivers them to their respective channels in the port group of interface 10 of the CT telecommunication center. Both the signals coming from the MUX-5 device and the signals delivered in the DEMUX-4 device pass through a transformer device DT, in the form of an optical circulator 6, which has the function of transforming the bidirectional signals on the PON side, to unidirectional signals in the side of the DWDM interface and vice versa.
[028] O dispositivo transformador DT, definido pelo circulador óptico 6, opera da seguinte maneira: o sinal unidirecional da interface DWDM 11 da central de telecomunicação CT que chega ao circulador óptico 6 por "a", só pode dele sair por "b", na forma de um sinal bidirecional no lado PON; o sinal bidirecional proveniente do dispositivo MUX-DEMUX 1 no lado PON e que chega ao circulador óptico 6 por "b", só pode dele sair por "c", na forma de um sinal unidirecional dirigido ao dispositivo DEMUX-4. [028] The transformer device DT, defined by optical circulator 6, operates in the following way: the unidirectional signal from the DWDM 11 interface of the telecommunication central CT that reaches optical circulator 6 by "a", can only leave it by "b" , in the form of a bidirectional signal on the PON side; the bidirectional signal coming from the MUX-DEMUX 1 device on the PON side and reaching the optical circulator 6 by "b", can only come out of it by "c", in the form of a unidirectional signal directed to the DEMUX-4 device.
[029] Com a construção acima citada, o sinal unidirecional advindo do dispositivo MUX-5 entra no circulador óptico 6 por "a" e sai por "b", para ser entregue ao dispositivo MUX-DEMUX 1 que, por sua vez, o entrega à linha PON com a fibra óptica FO única, também ilustrada na figura 1 como sendo dirigida ao primeiro divisor óptico DIV. [029] With the aforementioned construction, the unidirectional signal coming from the MUX-5 device enters the optical circulator 6 by "a" and exits by "b", to be delivered to the MUX-DEMUX 1 device, which, in turn, delivered to the PON line with the single FO optical fiber, also illustrated in figure 1 as being addressed to the first DIV optical splitter.
[030] O sinal em banda C, advindo da fibra óptica FO da rede e liberado pela portla C do dispositivo MUX-DEMUX 1, entra pela porta "b" do circulador óptico 6 e sai na porta "c" desse último, para ser entregue ao componente DEMUX-4 que roteia o sinal, considerando o comprimento de onda (cor) do canal utilizado, dirigindo-o para porta DWDM correspondente na central de telecomunicação CT . [030] The signal in band C, coming from the optical fiber FO of the network and released by port C of the device MUX-DEMUX 1, enters through port "b" of optical circulator 6 and exits in port "c" of the latter, to be delivered to the DEMUX-4 component that routes the signal, considering the wavelength (color) of the channel used, directing it to the corresponding DWDM port on the CT telecommunications center.
[031] O dispositivo transformador DT, na forma de um circulador óptico 6 ou de um acoplador/desacoplador óptico ou divisor óptico ( splitter-não ilustrado) que executa a mesma função, porém com uma perda significativa na intensidade dos sinais (maior que 3dB) em ambos os sentidos, de agregação e desagregação. Já o circulador óptico 6 apresenta uma perda de inserção muito baixa (inferior a ldB) sendo mais adequado à baixa perda de inserção do dispositivo agregador/desagregador óptico ADO na rede do usuário. [031] The transformer device DT, in the form of an optical circulator 6 or an optical coupler / decoupler or optical divider (not shown), which performs the same function, but with a significant loss in signal strength (greater than 3dB ) in both directions, of aggregation and disaggregation. Optical circulator 6, on the other hand, has a very low insertion loss (less than ldB) and is more suitable for the low insertion loss of the ADO optical aggregator / disintegrator device in the user's network.
[032] A provisão do dispositivo agregador/desagregador óptico ADO na central de telecomunicação CT permite que sejam agregados, a uma rede de tecnologia PON, sinais de telecomunicação de diferentes tecnologias como, por exemplo, a agregação de vários canais de sinais unidirecionais DWDM (4, 8, 16, etc. canais) à rede PON, incluindo canais bidirecionais nas tecnologias EPON, GPON, XGSPON, etc. Estes sinais são enviados por toda rede PON e atingem todos os pontos finais (usuários finais U1,U2) . Caso o ponto final seja de um usuário Ui que requeira sinais GPON (ou EPON, XGSPON, etc) , basta prover, na instalação do usuário final, uma ONU/ONT, ou seja, um dispositivo separador DS geralmente na forma de um filtro óptico passa faixa, filtro de canal 13, conforme ilustrado na parte inferior da figura 7, para liberar a esse usuário o canal ou banda na tecnologia PON. O dispositivo separador DS dessas ONUs/ONTs, na forma de um filtro óptico, remove todos os sinais das demais tecnologias e permite a passagem apenas do sinal da "cor" adequada (comprimento de onda) na tecnologia PON nesse exemplo de configuração da figura 7. No caso do usuário final ser atendido com link dedicado, deve ser instalado, entre o ponto óptico e o equipamento final (normalmente um Switch) , uma interface que filtra apenas o canal desejado na tecnologia[032] The provision of the ADO optical aggregator / disintegrator device in the CT telecommunication center allows telecommunication signals of different technologies to be aggregated to a PON technology network, for example, the aggregation of several channels of unidirectional DWDM signals ( 4, 8, 16, etc. channels) to the PON network, including bidirectional channels in EPON, GPON, XGSPON technologies, etc. These signals are sent across the entire PON network and reach all end points (end users U1, U2). If the end point is for a Ui user who requires GPON signals (or EPON, XGSPON, etc.), it is enough to provide, at the end user's installation, a ONU / ONT, that is, a DS separator device usually in the form of an optical filter bandpass, channel filter 13, as shown at the bottom of figure 7, to free that user the channel or band in PON technology. The DS separator device of these ONUs / ONTs, in the form of an optical filter, removes all signals from other technologies and allows only the signal of the appropriate "color" (wavelength) to pass through PON technology in this example of configuration of figure 7. In case the end user is served with a dedicated link, an interface that filters only the desired channel in the technology must be installed, between the optical point and the final equipment (usually a Switch).
DWDM. DWDM.
[033] Para receber da rede óptica PON um desejado canal dedicado na tecnologia DWDM, o usuário final U2 deve ter a interface óptica, de seu equipamento de telecomunicação, operativamente acoplada a um dispositivo seletor/transformador DST, na forma de um dispositivo óptico passivo CPE P2P (Customer Provider Edge Point-to-Point) , conforme ilustrado nas figuras 4 e 5, o qual é especifico para o canal desejado e que reconverte o sinal de uma fibra (bidirecional) para duas fibras (unidirecionais) , para entregar os sinais unidirecionais à interface óptica do usuário final U2. [033] To receive a desired dedicated channel in DWDM technology from the PON optical network, the U2 end user must have the optical interface of his telecommunication equipment, operatively coupled to a DST selector / transformer device, in the form of a passive optical device. CPE P2P (Customer Provider Edge Point-to-Point), as shown in figures 4 and 5, which is specific to the desired channel and which converts the signal from one fiber (bidirectional) to two fibers (unidirectional), to deliver the unidirectional signals to the U2 optical end-user interface.
[034] O dispositivo seletor/transformador DST, ilustrado nas figuras 4 e 5, é instalado no usuário final que queira ser atendido por meio de um canal dedicado, sendo o referido dispositivo capaz de disponibilizar, ao referido usuário final U2, apenas o comprimento de onda (cor/canal) da banda "c" de DWDM que a operadora que prover para aquele usuário. Este dispositivo seletor/transformador DST tem também a capacidade de transformar os sinais bidirecionais, recebidos pela fibra óptica única FO da rede PON, em sinais unidirecionais desejados pelo usuário final U2. [034] The DST selector / transformer device, illustrated in figures 4 and 5, is installed on the end user who wants to be served by means of a dedicated channel, the said device being able to make available to said end user U2, only the length wave (color / channel) of the DWDM band "c" that the operator provides for that user. This DST selector / transformer device also has the ability to transform the bidirectional signals received by the single FO fiber optic from the PON network into unidirectional signals desired by the end user U2.
[035] Na construção ilustrada na figura 4, o dispositivo seletor/transformador DST compreende um dispositivo seletor DS, por exemplo, na forma de um filtro de canal 13 do tipo passa faixa óptico que recebe todos os sinais disponibilizados na fibra óptica FO a partir da central de telecomunicação CT e que libera apenas uma faixa passante no comprimento de onda (canal) de DWDM que se quer entregar ao usuário final U2, sendo a faixa ou banda, passante pelo filtro de canal 13, conduzida a uma porta "b" de um dispositivo transformador DT, geralmente definido por um circulador óptico 14 que é operativamente associado às duas portas da interface do usuário final U2, sendo uma porta de recepção 15 e outra porta de emissão 16 de sinais unidirecionais . [035] In the construction illustrated in figure 4, the DST selector / transformer device comprises a DS selector device, for example, in the form of an optical bandpass type 13 channel filter that receives all signals made available on optical fiber FO from the telecommunication central CT and which releases only one passing band in the wavelength (channel) of DWDM to be delivered to the end user U2, the band or band being passed through the channel filter 13, conducted to a port "b" of a transformer device DT, generally defined by an optical circulator 14 which is operatively associated with the two ports of the end user interface U2, one receiving port 15 and the other sending port 16 of unidirectional signals.
[036] Todo sinal indesejado (l1,l 2,l 3,l 4,l C-N) é eliminado pelo filtro de canal 13. Apenas o desejado canall N do DWDM entra na porta "b" do circulador óptico 14, sendo que o sinal liberado pela porta "c" desse último é dirigido à porta de recepção 15 da interface DWDM do usuário final U2. O sinal emitido pela porta de emissão 16 da interface DWDM do usuário final U2 (na cor desejalda N) é dirigido à porta "a" do circulador óptico 14 que o entrega à porta "b" . Esse sinal unidirecional, emitido pela interface do usuário final U2, passa então pelo filtro de canal 13 e é conduzido à fibra óptica FO da rede PON. [036] Any unwanted signal (l 1 , l 2 , l 3 , l 4 , l CN) is eliminated by the channel filter 13. Only the desired channel N of the DWDM enters port "b" of the optical circulator 14, being that the signal released by port "c" of the latter is directed to receiving port 15 of the DWDM interface of the end user U2. The signal emitted by the emission port 16 of the DWDM interface of the end user U2 (in the desired color N) is directed to port "a" of optical circulator 14 which delivers it to port "b". This unidirectional signal, emitted by the end user interface U2, then passes through the channel filter 13 and is conducted to the optical fiber FO of the PON network.
[037] O dispositivo seletor/transformador DST, na forma de um dispositivo óptico passivo CPE P2P, pode ser definido ainda conforme ilustrado na figura 5, também na forma de um dispositivo separador DS, com uma construção e uma funcionalidade iguais àquelas do dispositivo ilustrado na figura 4, a não ser pelo fato de o filtro de canal 13 ser posicionado entre o circulador óptico 14 e a porta de recepção 15 da interface DWDM do cliente final U2. Uma vez que os detectores de recepção da interface DWDM do usuário final U2 necessitam de filtragem apenas do canal correspondente (pois são de banda larga e sensíveis, praticamente, à toda banda óptica útil de telecomunicações) , a versão da figura 5 apenas filtra a recepção dos sinais, não havendo necessidade de filtragem na transmissão, pois esta se dá apenas no canal desejado e utilizado pelo respectivo usuário final U2. A vantagem da versão da figura 4 é a segurança de que uma interface de cor diferente à da CPE P2P seja impedida de ser acoplada à rede PON (por um erro de comissionamento do usuário) . A vantagem da versão da figura 5 é a menor perda de inserção na transmissão do sinal P2P (ponto a ponto) . [037] The DST selector / transformer device, in the form of a passive CPE P2P optical device, can be further defined as shown in figure 5, also in the form of a DS separator device, with the same construction and functionality as those of the illustrated device in figure 4, except that the channel filter 13 is positioned between the optical circulator 14 and the receiving port 15 of the DWDM interface of the final client U2. Since the reception detectors of the DWDM user interface final U2 require filtering only of the corresponding channel (as they are broadband and sensitive to practically all useful telecommunications optical band), the version of figure 5 only filters the reception of the signals, with no need for filtering in the transmission, as this takes place only on the desired channel and used by the respective end user U2. The advantage of the version in figure 4 is the security that a different color interface to that of the CPE P2P is prevented from being coupled to the PON network (due to a user commissioning error). The advantage of the version of figure 5 is the lower insertion loss in the transmission of the P2P signal (point to point).
[038] A figura 6 ilustra uma terceira possibilidade construtiva para o dispositivo seletor/transformador DST, também na forma de um dispositivo óptico passivo CPE P2P, sendo que, nesse caso, ele toma a forma de um dispositivo seletor/transformador DST com o filtro de canal 13, das construções das figuras 4 e 5, sendo substituído por um dispositivo seletor DS-17 na forma de um multiplexador- demultiplexador MUX-DEMUX, que tem a função de separar o canall cN para o usuário final U2 P2P (assim como o filtro de canal 13 nas versões das figuras 4 e 5) do restante das bandas disponibilizadas na rede PON. O dispositivo seletor DS-17 (MUX-DEMUX) opera em conjunto com um dispositivo transformador DT na forma de um circulador óptico 14 cuja função é a mesma daquela descrita para o circulador óptico 14 das figuras 4 e 5. Ao contrário do filtro de canal 13, as bandas indesejadas não são eliminadas, mas liberadas em fibra óptica de continuação FOC contendo todos os (canais) comprimentos de onda PON e todos os comprimentos de onda de DWDM, exceto o canall cN que é utilizado pelo usuário local. Com esta versão, é possível a operação em cascata de CPE P2P ou mesmo conectar uma ONU/ONT PON, ou seja, um dispositivo seletor DS, geralmente na forma de um filtro óptico passa faixa, na fibra óptica de continuação FOC, conforme ilustrado na parte inferior da figura 7, para liberar, ao respectivo usuário, o canal ou banda na tecnologia PON. [038] Figure 6 illustrates a third constructive possibility for the DST selector / transformer device, also in the form of a passive CPE P2P optical device, in which case it takes the form of a DST selector / transformer device with the filter of channel 13, of the constructions of figures 4 and 5, being replaced by a selector device DS-17 in the form of a multiplexer-demultiplexer MUX-DEMUX, which has the function of separating the channel cN for the end user U2 P2P (as well as the channel filter 13 in the versions of figures 4 and 5) of the rest of the bands available on the PON network. The selector device DS-17 (MUX-DEMUX) operates in conjunction with a transformer device DT in the form of an optical circulator 14 whose function is the same as that described for optical circulator 14 of figures 4 and 5. Unlike the channel filter 13, unwanted bands are not eliminated, but released on FOC continuation optical fiber containing all (channel) PON wavelengths and all wavelengths of DWDM, except the cN channel which is used by the local user. With this version, it is possible to cascade CPE P2P or even connect a ONU / ONT PON, that is, a DS selector device, usually in the form of an optical bandpass filter, on the FOC continuation optical fiber, as illustrated in bottom of figure 7, to release the channel or band using PON technology to the respective user.
[039] Na construção da figura 7, o sinal entregue ao dispositivo óptico passivo CPE P2P, que toma a forma de um dispositivo seletor/transformador DST, recebido da fibra óptica FO da rede PON, é filtrado pelo dispositivo seletor DS 17, na forma de um multiplexador-demultiplexador MUX-DEMUX que substitui o filtro de canal 13 das construções das figuras 4 e 5 e que opera em conjunto com um dispositivo transformador DT, na forma de um circulador óptico 14 cuja função é a mesma daquela descrita para o circulador óptico 14 das figuras 4, 5 e 6. A cor desejada (canal ou banda) para esse usuário final U2 é removida e inserida por uma interface óptica 21 DWDM acoplada a um Switch/SDH/TDM 20 do usuário. Os demais comprimentos de onda DWDM e PON são roteados através de uma fibra óptica de continuação FOC e entregues ao mesmo usuário ou a outro usuário que requeira canal ou banda da tecnologia PON presente na fibra óptica de continuação FOC. [039] In the construction of figure 7, the signal delivered to the passive optical device CPE P2P, which takes the form of a DST selector / transformer device, received from the optical fiber FO of the PON network, is filtered by the selector device DS 17, in the form of a multiplexer-demultiplexer MUX-DEMUX that replaces the channel filter 13 of the constructions in figures 4 and 5 and that operates in conjunction with a transformer device DT, in the form of an optical circulator 14 whose function is the same as that described for the circulator optical 14 of figures 4, 5 and 6. The desired color (channel or band) for this end user U2 is removed and inserted by an optical interface 21 DWDM coupled to a Switch / SDH / TDM 20 of the user. The other DWDM and PON wavelengths are routed through a FOC continuation optical fiber and delivered to the same user or another user who requires a PON technology channel or band present in the FOC continuation optical fiber.
[040] No caso de uso em cascata, cada dispositivo óptico passivo CPE P2P tem que ser de modelo diferente, cada qual montado com um dispositivo separador DS-17 (MUX-DEMUX) correspondente ao canal que se deseja utilizar localmente e, da mesma forma, as interfaces ópticas 21 montadas nos switches 20 do usuário final U2 (podem ser interfaces DWDM SFP, SFP+, XFP, etc) devem ter as "cores" (canais ou bandas) do respectivo dispositivo óptico passivo CPE P2P. [040] In the case of cascade use, each passive CPE P2P optical device must be of a different model, each mounted with a DS-17 (MUX-DEMUX) separating device corresponding to the channel to be used locally and, in the same way Therefore, the optical interfaces 21 mounted on the switches 20 of the U2 end user (can be DWDM SFP, SFP +, XFP interfaces, etc.) must have the "colors" (channels or bands) of the respective passive CPE P2P optical device.
[041] Conforme exemplificado nas figuras, o sistema em questão permite o uso de rede passiva PON, de grande granularidade, para prover serviço ponto a ponto de banda dedicada, ou seja, que a operadora tenha uma rede mista PON/Pacotes na mesma infraestrutura, utilizando equipamentos totalmente passivos, dispositivos ópticos passivos CPE P2P de baixo custo e o uso de interfaces DWDM convencionais que podem ser acopladas a switches ou mesmo equipamentos TDM (SDH, PDH, SONET) de grande capacidade. O sistema em questão permite que a operadora tenha uma rede mista PON/Pacotes na mesma infraestrutura . [041] As exemplified in the figures, the system in question allows the use of passive PON network, of great granularity, to provide point-to-point service of dedicated band, that is, that the operator has a mixed network PON / Packages in the same infrastructure , using fully passive equipment, low cost CPE P2P passive optical devices and the use of conventional DWDM interfaces that can be coupled to large capacity switches or TDM equipment (SDH, PDH, SONET). The system in question allows the operator to have a mixed PON / Packages network in the same infrastructure.
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US6721506B1 (en) * | 1999-12-23 | 2004-04-13 | At&T Corp. | Method and system for delivering multi-band broadcast services in wavelength division multiplexed passive optical networks |
US8855492B2 (en) * | 2012-01-18 | 2014-10-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Selectable multiple-wavelength access for optical network units in arrayed waveguide based wavelength division multiplexing passive optical network |
US10069562B2 (en) * | 2016-10-11 | 2018-09-04 | X Development Llc | Optical circulator for free space optical communication |
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US6721506B1 (en) * | 1999-12-23 | 2004-04-13 | At&T Corp. | Method and system for delivering multi-band broadcast services in wavelength division multiplexed passive optical networks |
US8855492B2 (en) * | 2012-01-18 | 2014-10-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Selectable multiple-wavelength access for optical network units in arrayed waveguide based wavelength division multiplexing passive optical network |
US10069562B2 (en) * | 2016-10-11 | 2018-09-04 | X Development Llc | Optical circulator for free space optical communication |
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