System for distributing power and communication signals in optical fibre access networks

专利摘要:
The present invention relates to a system for distributing power and communication signals in optical fibre access networks using optical boxes, including an optical box bus containing three optical splitter boxes (10) connected in sequence and one termination box (12). The first optical splitter box (10) receives a distribution or splitter cable (CD) formed by a single optical fibre, providing a given optical input power, said optical splitter box (10) having an input splitter (DE) to effect the unbalanced splitting of the optical input power received in the optical box (10) of the bus into two portions. A first portion of the optical input power is conveyed to an output splitter (DS), the output splitter (DS) splitting the first portion of the optical power into optical powers that are selectively transferred to respective user terminal optical cables (CT). A second portion of the optical input power is conveyed to the second optical box (10) of the bus over a continuation cable (CC) formed by a single optical fibre, and so on until said optical termination box (12) is reached, where the optical input power is fully available to the user terminal optical cables (CT). The splitting ratio of the input splitters (DE) of each one of the three optical splitter boxes (10) varies between 70/30 and 90/10, the number before the slash being the percentage of the power conveyed to the next optical box (10, 12) of the system and the number after the slash being the percentage of the power conveyed to the output splitter (DS) and to the access cables (drop).
公开号:ES2837998A2
申请号:ES202190028
申请日:2019-11-22
公开日:2021-07-01
发明作者:Felchner Luiz Henrique Zimmermann；Renato Flávio Cruz；Barreto Rafael Goes；Arantes Rodrigo Arenales；Michael Kulczynskyj；Anderson Marcelo Stancyk；Elton Peloia；Eduardo Serpe
申请人:Furukawa Electric LatAm SA；
IPC主号:

专利说明:

[0003] FIELD OF THE INVENTION
[0005] [01] The present invention refers to a communication and power signal distribution system in fiber optic access networks, by means of three optical junction boxes and an optical termination box, generally hermetic and of the type that has a provided casing of an inlet opening, for receiving an optical distribution or branch cable, by connectorization, containing an optical fiber, and a plurality of outlet openings, generally provided in a cover, and through the outlet openings there is provided, by connectorization or by fusion, the connection of a respective fiber division of the optical distribution cable or of a respective optical fiber separated / derived from the latter, with a respective user terminal optical cable (drop cable), protruding from said optical box.
[0007] PREVIOUS TECHNIQUE
[0009] [02] Optical fiber is increasingly used for a variety of broadband applications, including voice, video, and data transmission. As a result of the growing demand for broadband communications, providers and / or operators of telecommunications and cable services are expanding their access networks (all the connection infrastructure and provision of service to users) in cable network technologies. for fiber optic networks, to increase the capacity and reach of your networks to provide more services to more subscribers near and far. To facilitate this capacity and reach, fiber optic networks must employ additional fiber optic cables, hardware, and components, increasing installation time, cost, and maintenance. This makes fiber optic networks more complex, requiring architectures that allow more efficient delivery of fiber optic service to the subscriber. These architectures often employ fiber optic network devices, such as optical connection terminals or optical boxes, for example, in fiber optic network branches. Fiber optic network devices act to optically interconnect the cables of Branch fiber optic, separating or combining optical fibers into one or more fiber cables and / or splitting or coupling optical signals, as required.
[0011] [03] Telecommunications operators and their access networks have increasingly taken advantage of Passive Optical Transmission (PON) technologies and product solutions compatible with these technologies. In general, these access networks are designed with "star" or "double star" topologies, taking advantage of components called optical splitters, which are concentrated ("Local Convergence") or distributed ("Distributed Topology") by the access network. external, but in a more common way, with a primary splitter that feeds in a "star" topology a set of second level splitters, each one feeding in turn ("double star") a set of operator customers.
[0013] [04] Power distribution systems for optical signals in data transmission access networks are known in the art. Such systems use branching optical junction boxes to branch at least one optical fiber from an optical distribution cable, which contains a plurality of optical fibers, allowing at least one branched optical fiber, containing a certain optical power, to form. a respective drop cable to be routed, at the end, to a respective optical termination box.
[0015] [05] Inside the optical termination box, the optical signals coming from the derived optical fiber are divided into a plurality of user optical fibers, and which are connected with a respective user terminal optical cable ("drop" cable or access cable), projecting from said optical termination box.
[0017] [06] The optical termination box can have, for example, the configuration object of the patent BR102016029000-7, with multiple outputs for the connection of multiple user terminals of optical cables, from an optical distribution or branch cable, received in said optical box.
[0019] [07] These known distribution systems, which use optical boxes, are developed, according to the network installation project, to provide the separation of the signals of the optical fibers of a multi-fiber distribution cable, in one or more optical cables bypass. Each optical drop cable contains at least one branched fiber and is received and retained, by connectorization or by fusion, in an optical termination box, of so that at least one derived optical fiber can be connected, by connectorization or by fusion, with a respective user terminal optical cable ("drop" cable or access cable), projecting a respective exit opening from said optical termination box .
[0021] [08] In the configuration of an optical termination box described in document BR102016029000-7, mentioned above, the single fiber drop optical cable has its optical fiber amended / fused to an optical fiber extension that splits one or more times, with balanced optical power, in a plurality of divided optical fibers, which are connected, by connectorization or fusion, to the respective output adapters provided in the output openings of the termination box.
[0023] [09] When the drop cable has multiple branched optical fibers, each can be connected directly or by optical fiber extensions, divided with balanced or even undivided optical power, and by connectorization or fusion, to a respective output adapter. Each output adapter can be quickly and easily connected to a connector on a user terminal cable.
[0025] [0010] Document US2014 / 0219621 A1 shows another configuration of an optical termination box, in which the branch and user termination cables are connected.
[0027] [0011] The aforementioned configurations were developed to facilitate reception and retention operations, in the optical termination box, without risk of loosening of the drop cable, generally of the multi-fiber type. In addition, these configurations have the objective of facilitating the operations of connection of the fiber (s) of the bypass optical cable with the box outlet adapters, carried out by the installer operator, preferably outside the termination box installation site. and before the closing of the box.
[0029] Despite the constructive and operational advantages achieved with the known optical power distribution systems, using branch and termination boxes, these systems do not guarantee an optimized optical signal at all the outputs of the network boxes. When the distribution cable is of the multi-fiber type, the derivations that are made by separating one or more fibers of the distribution cable, for the formation of the terminal cables along the network, do not present the optimized division ratios in relation to to the power demands of certain standards of distribution networks in urban environments, with higher density, and in rural environments with lower user density.
[0031] [0013] Furthermore, multi-fiber solutions in the pre-connected busbar use multi-fiber cables or cable bundles and, of course, have a very high diameter and weight. These characteristics represent a greater load (weight) on the posts, with direct implications on the hardware used and, in extreme cases, on the need to remodel the infrastructure (post exchange). In cases of maintenance or fiber breakage, it makes it difficult to repair and restore service.
[0033] [0014] Even in the cases of using an optical distribution cable with a single optical fiber, the derivations of this single fiber, along the network, are made, in a balanced way, in each branch box, both in a first branch division stage, as in a second division stage, for the formation of the optical fiber extensions to be connected to the respective cables of the user terminal. Thus, even in this case, the optical power distribution does not present the optimized division ratios in relation to the power demands of the usual standards of distribution networks in urban and rural environments.
[0035] [0015] This known distribution of the optical power available in a distribution cable is carried out, throughout the network, within standards defined by the optical power of the fibers of the distribution cables and of any symmetrically divided optical fiber, This makes it difficult and even blocks a "cascade" optical power distribution, with the derivations and eventual divisions not equipping optical powers specifically dimensioned according to the needs of the different users of terminals to be served and also with the characteristics of certain network topologies.
[0037] [0016] In many cases, this distribution, not very flexible and not capable of adapting the optical power available to a user, ends up causing deficiencies in the available power or requiring the use of optical power attenuators, in order to achieve the desired power , with the consequent loss of energy.
[0039] [0017] In addition to the aspects mentioned above and related to the difficulty of optimizing the distribution of the optical powers demanded by the network, in the cases in which the distribution is carried out with little or no pre-connection of the cables optics and optical extensions, this distribution becomes even more problematic when performed in the field.
[0041] DESCRIPTION OF THE INVENTION
[0043] In view of the limitations of the known solutions as mentioned above, the present invention aims to provide a power distribution system in fiber optic access networks, using a predetermined busbar of optical branching and termination boxes. , allowing a distribution of the optical power in "cascade", with the derivations and eventual divisions that provide optical powers dimensioned according to the needs of the different users of the terminal.
[0045] [0019] The present invention relates to a system for the distribution of communication and power signals in fiber optic access networks by means of optical boxes, which comprises an optical box bus that contains three branch optical boxes connected in sequence and a box termination. The first optical branch box receives a distribution or branch cable formed by a single optical fiber that provides a certain input optical power, said optical branch box having an input divider to divide, in an unbalanced way, the optical power of input received in the optical box of the busbar in two parts. A first part of the input optical power is sent to an output splitter, the output splitter dividing the first part of the optical power into optical powers that are selectively transferred to the respective optical cables of the user terminal. A second part of the input optical power is sent to the second optical box of the bus through a continuation cable formed by a single optical fiber, and so on until reaching said optical termination box, in which the input optical power it is fully available to the optical cables of the user terminal. The division ratio of the input dividers for each of the three optical bypass boxes varies between 70/30 and 90/10, the number before the bus being the percentage of the power sent to the next optical box in the system and the number then the bar the percentage of the power sent to the output splitter and access cables (drop).
[0046] BRIEF DESCRIPTION OF THE FIGURES
[0048] The system in question will be described below, with reference to the attached drawings, which are provided solely by way of example and in which:
[0050] Figure 1 represents a diagram illustrating a part of an optical fiber network formed by three optical drop boxes and a termination box, the first of which receives a distribution cable containing a single optical fiber and is connected to a termination box input adapter.
[0052] [0021] Figure 2 illustrates a test with real values of the preferred embodiment of the present invention, formed by three optical bypass boxes and a termination box, where the optical losses in dB in each box are calculated.
[0054] [0022] Figure 3 represents an embodiment of the present invention, where the optical boxes are each formed in two box bodies and with the final optical termination box, formed in a single body.
[0056] DESCRIPTION OF THE INVENTION
[0057] [0023] As mentioned above and illustrated in Figure 1, the system of simultaneous branching and termination of optical fibers in data distribution networks uses optical branching boxes 10 and optical termination boxes 12.
[0059] [0024] For the purposes of the context of the present invention, an optical branch box is an optical box with a first splitter (splitter), which divides an incoming optical power into a continuation optical power, which will be sent to the other box optical, and a terminating optical power, which will be sent to a second splitter (splitter) to divide the optical power that will be delivered to users (drop cable). Also, an optical termination box is an optical box that consists of a single splitter, which divides the incoming optical power that will be sent to the users (drop cable).
[0061] [0025] Preferably, the optical boxes used are tubular and hermetic optical boxes, comprising housing for dividers, bases and covers for different reinforced optical adapters. Examples of optical boxes that can be used are CTOP-L 9P, CTOP-L 10P and CTOP-L 10P Generation 2, as well as the optical box described in the patent BR102016029000-7. However, it is clear to a person skilled in the art that any optical box with an unbalanced splitter configuration followed by a balanced splitter can be used, as well as a box with only balanced splitter for the last box, according to the busbar disclosed in the present invention.
[0063] The optical box 10 can be formed with a closed end and provided with an inlet opening (not shown) to receive a CD distribution optical cable, which contains an optical fiber (figure 1), and an open end that is closed by a cover 20 that can be of the sealed or removable type.
[0065] [0027] Preferably, the distribution cable CD, of an optical fiber, is connected, that is, provided with an input connector CE of any suitable configuration, to be coupled and retained in an input adapter AE assembled, in a watertight manner , at the inlet opening of the casing 10. Non-limiting examples of unreinforced connector are the SC model.
[0067] More preferably, the DC distribution cable, formed by an optical fiber and providing a certain input optical power, can be pre-connected and connected to the optical box 10 by means of a reinforced connector external to the box.
[0069] [0029] In the embodiment shown in figure 1, the distribution cable CD contains only one optical fiber having a predetermined input optical power and which is connected, through the input connector CE and the input adapter AE or by fusion optical (not shown), to a fiber optic extension EFO internal to the box 10 and which, in the illustrated example, is provided with a connection connector CL which is coupled to the input adapter AE.
[0071] The optical fiber extension EFO extends into an input splitter device DE in which it is divided into a continuation fiber FC and at least one termination fiber FT. The FT terminating fiber, in turn, is routed to a DS output splitter device, where it is split into multiple FU user fibers, each of which can be selectively connected, by fusion or by connectorization, to respective connectors. C and output adapters AS, which are arranged in openings generally located in cover 20, to the respective optical cables of user terminals CT that can preferably be connected.
[0072] According to the system now proposed, a desired part of the incoming optical power, available in the DC distribution cable (which can be defined by a drop cable) with a single optical fiber, is divided from the latter, in a way unbalanced in the DE input splitter device (splitter), in at least one FT terminating fiber and one FC continuation fiber.
[0074] [0032] The terminating fiber FT has an optical power generally lower than that of the continuation fiber FC and is dimensioned according to the needs of the users it will serve. To do this, the terminating fiber FT is sent, with or without EF fusion modification of intermediate patch cords, to the DS output splitter device, where it is divided into multiple FU user fibers, which can have equal or unbalanced optical powers, to provide different connection points for users with different optical power demands.
[0076] The continuation fiber FC, which contains any remaining input optical power in the optical box 10, may be provided with an output connector C for coupling to an output adapter AS arranged in a respective opening of the box 10, usually on the top. 20. The CS output connector of a DC continuation cable is coupled to the AS output adapter to lead to a next optical termination box 10. Said coupling between optical boxes is repeated successively until an optical termination box 12 is reached wherein the incoming optical power is fully available to the user CT terminal leads, to be selectively connected to said optical box 12.
[0078] The objective of the bypass system proposed by the present invention is to provide a power distribution in a simple and optimized way for an optical network with point-multipoint technology, where each port of the PON equipment will be shared by 32 optical network terminals (ONT ).
[0080] The busbar presents, in the optical bypass boxes, relationships for the unbalanced division of the optical power, between the continuation output and the termination outputs, and relationships for the balanced or unbalanced division between the termination outputs of each optical box.
[0081] [0036] The great advantage of 1:32 distribution technologies is that it is possible to offer a greater bandwidth to users, and also that the busbar of optical boxes can be simpler, facilitating the installation and mapping of busbars in a determined area.
[0083] Taking into account that the proposed bus must serve 32 users, additional parameters must be taken into account for the design of the bus, such as the input optical power of the OLT (optical line terminal - optical line terminal), as well as the minimum and maximum power that must be delivered to the ONU (optical network unit - optical network unit) or ONT (optical network terminal - optical network terminal), that is, to the terminals present in the users' facilities.
[0085] [0038] According to the international standard ITU-T G.984, "Classes" of "Loss Budget" are defined that must be respected by the OLT and ONU transmission and reception equipment referenced above. Today, a recognized standard in this standard is Class C +, which provides the value of 32 dB (Thirty-two decibels) as the maximum limit of attenuation between OLT and ONT devices, and this value is used as a reference for realizations of the invention presented herein.
[0087] However, other OLT and ONT devices on the market fear Loss Budget values ranging from 28 dB to 34 dB. However, other existing values / classes or future technological developments can be considered for the invention as well, since the demonstrations and concepts can be validated for different values / classes of equipment.
[0089] [0040] In the embodiments illustrated in the present invention, the solution is based on preconnected optical terminal boxes with balanced DS output dividers with 8 outputs, this metric driving the number of boxes that are arranged in cascade. Thus, for a bus that must serve 32 users, 4 optical boxes with 8 outputs, 3 optical junction boxes 10 and an optical termination box 12 are required.
[0091] [0041] Preferably, the split ratios are designed so that the optical signals, available at the termination outputs of each optical branch box and the optical termination box, comply with the optical sensitivity of the ONU. However, all system losses must be taken into account, such as losses along the cable and losses due to fusion or connectorization of the optical fiber.
[0092] [0042] Preferably, the division ratio of the input divider DE of each of the optical bypass boxes 10 is the same. This is advantageous as system operators will only need to purchase an optical box configuration, that is, a single product, which facilitates logistics, practicality and potentially lowers project costs.
[0094] [0043] To comply with the sensitivity of OLT and ONT, the split ratio of the DE input splitter of each of the optical bypass boxes 10 has a split ratio between 70/30 and 90/10, the number before the bar is the percentage of the power sent to the next optical box 10 in the system and the number after the bar is the percentage of the power sent to the access cables (drop).
[0096] [0044] As illustrated in figure 1, a preferred execution mode for the proposed system comprises 3 optical junction boxes 10 connected sequentially, terminated by a termination box 12.
[0098] [0045] In this preferred configuration, the optical boxes are configured with the following split ratios: in the first, second and third branch boxes of the system, 70% of the input optical power is sent to the branch box 10 following and 30% of the input optical power is directed to the access cables ("drop" cables) that can be connected to each box. 70% of the input optical power in the third box is sent to the fourth and last box of this example of system installation, whose box defines an optical termination box 12, which has its outputs for the access cables (cables of "drop") each of which receives, in a balanced way, a part of the input optical power in that last optical termination box 12.
[0100] [0046] Figure 2 shows a test with real values of the preferred embodiment of the present invention, considering the losses of the cable and the connectors. The calculated optical losses for this configuration are shown below, in dB:
[0105] [0047]
[0107] [0048] Usually, and for the purposes of the tests carried out in the present invention, the losses in the cable in the direction of transmission, wavelength of 1490 nm, is -0.26 dB / Km and in the cable in the direction reception, the wavelength of 1310 is -0.35 dB / Km. In addition, optical losses are considered for cable connection by fusion of -0.1 dB, and by connectorization of -0.3 dB. However, a person skilled in the art will appreciate that new forms of connection or different cables will have their respective losses, which can be considered in the design of the optical power distribution bus proposed in the present invention.
[0109] Next, a second embodiment of the present invention will be described, in which the busbar comprises 3 sequentially connected optical junction boxes 10, terminated by a termination box 12. The division ratio of the optical boxes is 85 / 15, 85/15, 85/15, the number before the bus being the percentage of the power sent to the next optical box 10 in the bus and the number after the bus is the percentage of the power sent to the cables of access (fall).
[0111] The second configuration maintains the premise that the division ratio must be the same for all optical boxes, which facilitates the installation and maintenance of the barraging. Below are the calculated optical losses for this alternative configuration, in dB
[0116] [0051] The calculated data transmission attenuation in the OLT is -24.485 dB.
[0118] [0052] Next, a third embodiment of this invention is described, where the busbar comprises 3 sequentially connected optical junction boxes 10, terminated by a termination box 12. The division ratio of the optical boxes is 90/10, 90 / 10, 90/10, the number before the bus being the percentage of the power sent to the next optical box 10 in the bus and the number after the bus is the percentage of the power sent to the access cables (drop ). The calculated optical losses for this alternate configuration are shown below, in dB.
[0120] [0053] The data transmission attenuation calculated in the OLT is -30.1525 dB
[0122] [0054] Finally, a fourth embodiment of the present invention will be described, in which the busbar comprises 3 sequentially connected optical junction boxes 10, terminated by a termination box 12. The division ratio of the optical boxes is 70/30 , 85/15, 70/30, where the number before the bus is the percentage of the power sent to the next optical box 10 in the bus and the number after the bus is the percentage of the power sent to the access cables (drop).
[0124] [0055] The optical losses calculated for this alternative configuration are shown below, in dB
[0127] [0056] The calculated data transmission attenuation in the OLT is -24.485 dB. Again, the losses in the cable in the direction of transmission and reception and the optical losses by connection and fusion are considered. Therefore, it is observed that the premise of the division relationship will always be the same for the three optical bypass boxes, although it is preferred, it is not essential for the design of the bus according to the present invention.
[0129] These exemplary embodiments can be carried out entirely with pre-connection between the elements, thus avoiding user errors and making installation faster and easier.
[0131] Although the two solutions (multi-fiber and single-fiber bushing) use pre-connected cables, the question of lengths (cable sections) is advantageous in the embodiment in which the cable is single-fiber, illustrated in Figure 1. This must to the reduced diameter of the single fiber cable, which allows easy storage of the excess cable in specific accessories of the CTOP-L optical boxes.
[0133] [0059] On the other hand, current multifiber cables on the market, due to their diameter and rigidity, do not allow storage in the optical boxes themselves, so they are manufactured in specific lengths for each project and are installed without considering spare parts for maneuvers. And maintenance. Therefore, in multi-fiber solutions, the designer must accurately collect this information in the field.
[0135] Fixed length monofiber cables can be manufactured without this concern for precision because any excess can be easily stored. Even with an accurate inspection, installation unforeseen events can occur and exact lengths make replacement difficult for maintenance.
[0137] [0061] As can be seen from the above, two or even more DE input and DS output splitter devices can be used to provide different, generally unbalanced, division and subdivision ratios to give the system great versatility to adapt to the actual needs of the different users of the fiber optic network, minimizing or even eliminating the need for optical attenuators.
[0139] [0062] Additionally, if there is a need to serve 64 users from an OLT using the 1:32 bushing proposed by the present invention, it is possible to make a bypass before bussing, using a balanced 1: 2 splitter. In this way, a 1:64 OLT can be divided into 2 1:32 bars, which can be applied to the system proposed by the present invention. Thus, the proposed architecture allows combining several 1:32 busbars, in a modular way, to serve applications where it is required to serve more than 32 users.
[0141] Taking into account the characteristics of the proposed system, which allows to provide a versatile installation solution, using previously sealed optical termination boxes for the back and simple connection of connected optical cables of DC distribution, CT termination and DC continuation, the devices DE input and DS output dividers can be produced in advance in a factory environment and according to the potential characteristics of the network installation to be supplied.
[0143] [0064] When using unsealed optical boxes 10 and unconnected DC distribution cables, termination cables and DC continuation cables, the different optical connections are made by fusion, generally at the site of the network installation.
[0145] [0065] As schematically illustrated in Figure 3, it may be desirable that each optical branch box 10 of the network is formed by a first box part 10A and a second part of the box 10B, separated from the first part of the box, according to the topological characteristics of the network.
[0147] In this configuration, the distribution cable CD has its input connector CE, preferably pre-assembled, coupled to an input adapter AE of the first box part 10A of the first branch box 10, to be connected to an extension EFO fiber cable internal to the first part of the box 10A and provided with a CL connection connector that is coupled to the AE input adapter. The fiber optic extension EFO is received in an input splitter device DE, arranged inside the first part of the box 10 and in which the fiber optic extension is divided into a continuation fiber FC and a terminating fiber FT, which are preferably pre-connected, each, with a respective connector C which is coupled to the respective outlet adapter AS, provided in a respective outlet opening (not shown) of the first box part 10A.
[0149] To one of the output adapters AS of the first box part 10A, a connector C of a DC continuation cable is coupled, preferably pre-connected at both ends and having its opposite connector C, coupled to an input adapter AE of the first box part 10A of a rear branch box 10 of the network.
[0151] [0068] To the other output adapter AS of the first box part 10A, of said first optical box 10 of the network, is coupled a connector C of a CDT terminal drop cable, preferably pre-connected at both ends and having its opposite connector C, coupled to an input adapter AE of the second box part 10B of the same first optical box 10 of the network.
[0153] [0069] The second part of the box 10B houses an output splitter device DS in which an optical fiber FT termination is received, preferably pre-connected and having its connector C coupled to connector C of the derivation cable of the CDT terminal, by means of the AE input adapter.
[0155] [0070] In the output splitter device DS, the terminating optical fiber FT is divided into multiple user optical fibers FU, each of which can be selectively connected, by connectorization, preferably by pre-connectorization, with the respective connectors C and outlet adapters AS, which are provided in the outlet openings (not shown) of the second part of the box 10B and into which you can connect the respective optical cables of the user terminal CT which are preferably connectorized, as illustrated in the figures of the drawings.
[0157] The individual configuration of each optical branch box 10 of the fiber optic network can be made in a single part, as shown in figure 1, or in two parts of the box, as illustrated in figure 3 , with the same network that contains both types of configuration. However, the optical termination box 12 has only one part, as it houses only the output splitter device DS. The configuration of separate boxes in box parts is interesting since the bus operator can add the termination box parts 10B only when necessary, that is, if there were users subscribed to the location of the optical box.
[0159] [0072] A preferred embodiment, not limited to this, provides that the system works entirely with pre-connection between the elements, this pre-connection can be applied to all or part of the elements. This prevents user errors and makes system installation quick and easy.
[0160] [0073] However, it should be understood that the distribution cable CD can be housed and axially locked within the box 10 without the use of an input connector CE, as described, for example, in patent application BR102016029000-7.
[0162] Taking into account the characteristics of the proposed system, which allows to provide a versatile installation solution, using previously sealed optical junction and termination boxes for the back and simple connection of optical fibers and pre-connected optical cables, the DE input splitter devices and DS output can be produced previously in a factory environment and according to the potential characteristics of the network installation to be supplied.
[0164] Therefore, the present invention is advantageous since the elements of the access network (distribution boxes and optical termination with embedded dividers) are arranged in the form of a bus or sequential cascade, that is, a first element receives the signaling optics that comes from the concentrator equipment (generally a transmission over kilometers), distributes part of that signaling to a group of nearby clients (tens or hundreds of meters) and sends another part of the optical signaling to the second element of the sequence and so on, following the rules and even the limits imposed by the PON transmission technology itself.
[0165] [0076] A second differential of this solution is that, unlike other transmission technologies where complex calculations and the use of proprietary software tools are needed to define which element / divider should be used at each (physical) location and position within a specific sequence, in this case the solution foresees the use of a bar with fixed elements / dividers. The proposed configuration aims to fulfill a 1:32 relationship with a bus that comprises 3 optical junction boxes 10 and an optical termination box 12. However, said configuration can be replicated in a modular way to find solutions in which it is necessary to attend to more than 32 users.
[0167] [0077] This avoids the need for the Operator to perform calculations and definitions during the executive project for each section of the access network, facilitating the control of the application of the elements during the configuration, reducing the types of elements / products that this will keep in stock for setup and maintenance (replenishment), among other tangible benefits that can be listed.
[0169] [0078] The configuration in which all the branch optical boxes 10 have the same configuration, especially the same division ratio of the input splitter DE, is also advantageous, since said configuration simplifies the installation and maintenance of the bus.
[0171] [0079] A third differentiating factor of the solution is the use of monofiber optical cables, according to the preferred embodiment of Figure 1 of the present invention. Other optical solutions use multi-fiber cables (several optical fibers within the core of a cable) or bundles of cables along the access network, while the proposed solution is based on the interconnection between elements of the access network using only cables. monofiber (a single fiber within the core of the cable), which is possible through combination with available splitters and planned sequences.
[0173] [0080] Solutions with multi-fiber cables naturally have a diameter and weight much higher than those of a single fiber solution, incurring a greater occupation and load (weight) of the posts, with direct implications in the hardware used and, in cases extremes, in the requirement of remodeling the infrastructure (exchange of positions).
[0174] [0081] The fourth distinguishing feature to be highlighted is the configuration of all the elements (boxes / dividers and access network cables) with pre-connected characteristics, that is, the elements are provided with factory-prepared optical connectors for their interconnection " plug-and-play ”, quick and easy.
[0176] Although only some examples of embodiments of the optical fiber termination and derivation system in question have been presented here, it should be understood that changes can be made in the shape and arrangement of the different components of the system, without departing from the proposed inventive concept .

权利要求:
Claims (15)
[1]
1. Power and communication signal distribution system in fiber optic access networks by means of optical boxes (10), characterized in that it comprises a busbar of optical boxes that contains three optical derivation boxes (10) connected in sequence and terminated by a termination box (12);
in which the first optical branch box (10) receives a distribution or branch cable (CD) formed by a single optical fiber that provides a certain input optical power, said optical branch box (10) presenting an input splitter (DE) to divide, in an unbalanced manner, the input optical power received in the optical box (10) of the bus into two parts;
wherein a first part of the input optical power is sent to an output splitter (DS), the output splitter (DS) divides the first part of the optical power into optical powers that are selectively transferred to the respective optical cables user terminals (CT),
in which a second part of the input optical power is sent to the second optical box (10) in the bus through a continuation cable (CC) formed by a single optical fiber,
and so on until said optical termination box (12) is reached, in which the input optical power is made integrally available to the optical terminal cables (CT) of the user; Y
in which the division ratio of the input dividers (DE) of each of the three optical derivation boxes (10) varies between 70/30 and 90/10, the number before the bar being the percentage of the power sent to the next optical box (10, 12) in the system and the number then bars the percentage of the power sent to the output splitter (DS) and access cables (drop).
[2]
System according to claim 1, characterized in that the division ratio of the input dividers (DE) of each optical branch box (10) is the same.
[3]
System according to claim 1 or 2, characterized in that the division ratio of the three optical bypass boxes (10) is in the proportion of 70/30, 70/30, 70/30, the number being before the bus the percentage of the power sent to the next optical box (10, 12) in the system and the number after the bus the percentage of the power sent to the access cables (drop).
[4]
4. System according to claim 1 or 2, characterized by the fact that the division ratio of the three optical junction boxes is in the proportion of 85/15, 85/15, 85/15, being the number before the bar the percentage of the power sent to the next optical box (10, 12) in the system and the number after the bar the percentage of the power sent to the access cables (drop).
[5]
System according to claim 1 or 2, characterized in that the division ratio of the three optical bypass boxes is in the proportion of 90/10, 90/10, 90/10, the number before the bar the percentage of the power sent to the next optical box (10, 12) in the system and the number after the bar the percentage of the power sent to the access cables (drop).
[6]
System according to claim 1, characterized in that the division ratio of the first branch box (10) is in the ratio 70/30, the second branch box (10) is in the ratio 85/15 and the third junction box (10) is in the 70/30 ratio, the number before the bus being the percentage of the power sent to the next optical box (10) in the system and the number after the bus the percentage of power sent to access cables (drop).
[7]
System according to any of claims 1 to 6, characterized in that the optical junction box comprises an input adapter (AE) connectorized to receive distribution cable (CD) connectorized with input connector (CE).
[8]
System according to any one of claims 1 to 7, characterized in that the output divider (DS) of each optical box (10, 12) is a balanced 1: 8 divider.
[9]
System according to any of claims 1 to 8, characterized in that each optical box (10) comprises an output adapter (AS) connected to couple to the output connector (C) of a continuation cable (CC) connected to a single fiber optic.
[10]
10. System according to any of claims 1 to 9, characterized in that each optical branch box comprises an optical fiber extension (EFO) internal to the box (10), provided with a connection connector (CL), in which the fiber optic extension (EFO) is sent to the input splitter device (DE), where it is split into a continuation fiber (FC) and at least one termination fiber (FT).
[11]
System according to any one of claims 1 to 10, characterized in that the terminating fiber (FT) is sent to an output splitter device (DS) and divided into multiple user fibers (FU), each one of which can be selectively connected, by connectorization, to the respective connectors (C) and output adapters (AS).
[12]
System according to any one of claims 1 to 11, characterized in that each branch optical box (10) comprises a continuation fiber (FC), which contains the second part of the input optical power in the optical box (10), wherein the continuation fiber (FC) is provided with an output connector (CS) for coupling to an output adapter (AS) provided in a respective box opening (10).
[13]
13. System according to any of claims 1 to 12, characterized in that the output adapters (AS) are arranged in the openings located in the cover (20), for connection with the user's terminal optical cables (CT) .
[14]
System according to any of claims 1 to 13, characterized in that each branch box (10) of the network comprises: a first part of the box (10A), in which the optical distribution cable is received (CD) or continuation (CC) and is divided into a terminal branch optical cable (CDT) and a continuation optical cable (CC); and a second box part (10B) in which the terminal branch optical cable (CDT) is received and divided into multiple optical fibers, with the respective optical powers to be transferred, by connectorization, to the respective terminal optical cables ( CT) of the user.
[15]
System according to claim 14, characterized in that the second box part (10B) is separated from the first box part (10A) and is connected thereto by the terminal drop cable (CDT).

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同族专利:

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公开号 | 公开日

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ES2837998R1|2021-08-10|

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CO2021006899A2|2021-08-09|

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DE112019005857T5|2021-11-11|

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WO2020107085A1|2020-06-04|

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CL2019000675A1|2019-07-05|

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PE20200759A1|2020-07-29|

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ES2837998A8|2021-08-09|

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GB2593338A|2021-09-22|

引用文献:

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US8238750B2|2009-08-04|2012-08-07|Cisco Technology, Inc.|Split/smart channel allocated WDM-PON architecture|

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WO2013025979A2|2011-08-17|2013-02-21|Tyco Electronics Corporation|Distributed passive optical networks|KR20200083380A|2018-12-29|2020-07-08|후아웨이 테크놀러지 컴퍼니 리미티드|Optical distribution device|

法律状态:
2021-08-10| EC2A| Search report published|Ref document number: 2837998 Country of ref document: ES Kind code of ref document: R1 Effective date: 20210803 |

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2021-12-01| FA2A| Application withdrawn|Effective date: 20211125 |

优先权:

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申请号 | 申请日 | 专利标题

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BR102018074245A|BR102018074245A2|2018-11-26|2018-11-26|power distribution system in optical fiber access networks|

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BR102019004305-9A|BR102019004305A2|2018-11-26|2019-03-01|COMMUNICATION AND POWER SIGNAL DISTRIBUTION SYSTEM IN OPTICAL FIBER ACCESS NETWORKS|

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PCT/BR2019/050500|WO2020107085A1|2018-11-26|2019-11-22|System for distributing power and communication signals in optical fibre access networks|

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