Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04Q—SELECTING
  • H04Q11/00—Selecting arrangements for multiplex systems
  • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
  • H04Q11/0062—Network aspects
  • H04Q11/0071—Provisions for the electrical-optical layer interface
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04J—MULTIPLEX COMMUNICATION
  • H04J14/00—Optical multiplex systems
  • H04J14/02—Wavelength-division multiplex systems
  • H04J14/0201—Add-and-drop multiplexing
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
  • G02B6/24—Coupling light guides
  • G02B6/36—Mechanical coupling means
  • G02B6/38—Mechanical coupling means having fibre to fibre mating means
  • G02B6/3807—Dismountable connectors, i.e. comprising plugs
  • G02B6/3897—Connectors fixed to housings, casing, frames or circuit boards
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
  • G02B6/24—Coupling light guides
  • G02B6/42—Coupling light guides with opto-electronic elements
  • G02B6/4201—Packages, e.g. shape, construction, internal or external details
  • G02B6/4246—Bidirectionally operating package structures
• • 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
  • H04B10/2589—Bidirectional transmission
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04J—MULTIPLEX COMMUNICATION
  • H04J14/00—Optical multiplex systems
  • H04J14/02—Wavelength-division multiplex systems
  • H04J14/0201—Add-and-drop multiplexing
  • H04J14/0202—Arrangements therefor
  • H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
  • H04J14/0212—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] using optical switches or wavelength selective switches [WSS]
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04J—MULTIPLEX COMMUNICATION
  • H04J14/00—Optical multiplex systems
  • H04J14/02—Wavelength-division multiplex systems
  • H04J14/0201—Add-and-drop multiplexing
  • H04J14/0215—Architecture aspects
  • H04J14/0216—Bidirectional architectures
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04J—MULTIPLEX COMMUNICATION
  • H04J14/00—Optical multiplex systems
  • H04J14/02—Wavelength-division multiplex systems
  • H04J14/0223—Conversion to or from optical TDM
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04J—MULTIPLEX COMMUNICATION
  • H04J14/00—Optical multiplex systems
  • H04J14/02—Wavelength-division multiplex systems
  • H04J14/0278—WDM optical network architectures
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04J—MULTIPLEX COMMUNICATION
  • H04J14/00—Optical multiplex systems
  • H04J14/02—Wavelength-division multiplex systems
  • H04J14/0278—WDM optical network architectures
  • H04J14/0282—WDM tree architectures
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04Q—SELECTING
  • H04Q11/00—Selecting arrangements for multiplex systems
  • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
  • H04Q11/0062—Network aspects
  • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04Q—SELECTING
  • H04Q11/00—Selecting arrangements for multiplex systems
  • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
  • H04Q11/0005—Switch and router aspects
  • H04Q2011/0007—Construction
  • H04Q2011/0016—Construction using wavelength multiplexing or demultiplexing
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04Q—SELECTING
  • H04Q11/00—Selecting arrangements for multiplex systems
  • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
  • H04Q11/0005—Switch and router aspects
  • H04Q2011/0007—Construction
  • H04Q2011/0033—Construction using time division switching
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04Q—SELECTING
  • H04Q11/00—Selecting arrangements for multiplex systems
  • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
  • H04Q11/0062—Network aspects
  • H04Q2011/0079—Operation or maintenance aspects
  • H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability

Definitions

• the invention is in the field of optical distribution networks (or ODNs for Optical Distribution Networks) serving subscribers to electronic communications services, and more particularly those combining different types of length-division multiplexing. wave.
• optical distribution networks or ODNs for Optical Distribution Networks
• Optical access network architectures typically use a different wavelength in transmission direction, the different users of a network sharing time windows of the signal. This technique called TDM (Time Division Multiplexing) shows limits in terms of maximum bit rates.
• TDM Time Division Multiplexing
• WDM wavelength division multiplexing
• TWDM and WDM systems being standardized (typically via the ITU-T Q2 SG15 G.989.x standard NG-PON2) are or will be deployed in addition to the previously deployed TDM systems (typically G-PON and XG-PON1) and will coexist with them for economic and user migration reasons.
• an optical infrastructure can therefore be mixed, that is to say, allow the connection of optical line terminals (commonly called Optical Line Terminal (OLT), which are TDM, TWDM or WDM, to optical network terminals (ONUs) for Optical Network Units, which are TDM, TWDM or WDM.
• OLT Optical Line Terminal
• a TWDM or WDM OLT has a different port associated with each up and down wavelength pair.
• a passive box called CEx (for Co-Existence element in English, coexistence element) carries out on a single fiber a downstream multiplexing and upstream demultiplexing, wavelengths of each one. TDM, TWDM, or WDM OLT ports.
• TDM, TWDM, or WDM OLT ports Upstream of the ECx box, the wavelengths of the TWDM and WDM systems must, however, be grouped by band to be multiplexed and demultiplexed into an individual wavelength by a box called WM (Wavelength Multiplexer) in order to limit the number of input ports of the CEx box, with each port associated with a single bandwidth.
• WM Widelength Multiplexer
• This WM box must be adapted, at its installation, specifically to all the wavelength channels of each port of each OLT WDM or TWDM that the operator of the ODN network plans to operate at that time. This brings a complexity and an initial overhead and makes difficult and expensive any evolution of the network.
• One of the aims of the invention is to overcome these disadvantages of the state of the art.
• the invention improves the situation by using an optoelectronic transceiver device comprising a first optical connector adapted to be connected to a first bidirectional optical fiber, and a second optical connector capable of being connected to a second bidirectional optical fiber. the device further comprising:
• An electrical-optical conversion module capable of supplying the insertion-extraction module with the wavelength inserted in the second optical signal from an incoming electrical signal
• An optical-electrical conversion module capable of converting the wavelength extracted from the first optical signal by the insertion-extraction module into an outgoing electrical signal.
• the optoelectronic transceiver device cleverly makes it possible to eliminate the multiplexing / demultiplexing box in wavelengths WM. Indeed, it is sufficient that the TWDM or WDM OLT ports of the mixed optical distribution infrastructure are each equipped with a device according to the invention, and that all the devices are directly connected to the ECx box of the mixed infrastructure. Therefore, there is no need for the WM box between the OLT ports and the CEx, and the disadvantages of the WM that are among other its additional cost and lack of scalability disappear.
• the insertion-extraction module of a device inserts and extracts in the optical fiber present at the first optical connector only the wavelengths associated with this device, that is to say associated with its port of OLT, allowing the other wavelengths of the optical signal to pass through the module intact, it is possible to recover the signals present at the second optical connector in another optical fiber connected to another OLT port with associated lengths rising wave (entering the device) and descending (leaving the device) different.
• the device according to the invention allows the connection of a bidirectional optical fiber to each of the two optical connectors.
• the order of the OLT ports in the cascade does not matter, which facilitates the installation and evolution of OLT port configuration in the mixed optical distribution infrastructure, since connect a new OLT port to the second unused optical connector of the device at the end of the cascade, as infrastructure planning requirements arise.
• the optoelectronic transceiver device further comprises a wavelength selection module to be inserted and extracted, configured to instruct the insertion-extraction module the wavelength to extract in the first optical signal and the wavelength to be inserted into the second optical signal.
• the device is generic in wavelength, which allows the manufacture and use of a single model for all TWDM and WDM OLT ports, the wavelengths down and amount being selected on the device when it is installed on an OLT port.
• the optoelectronic transceiver device further comprises an electrical plug adapted to transmit the incoming and outgoing electrical signals, said plug being able to connect removably to a port optical line terminal.
• the device is an independent part of the port of the OLT, which makes possible the use of existing standards of optoelectronic connectivity such as those available in pluggable optoelectronic modules XFP or SFP + type. Such optoelectronic modules are also inexpensive.
• the electrical plug is further capable of transmitting to the selection module an electrical signal comprising information relating to the wavelengths to be inserted and extracted.
• the wavelengths rising and falling that the device must use can be communicated to it through the port of the OLT, which has the advantage of not requiring any other physical operation than the connection. of the device in the port, and then to be able to modify the wavelengths remotely, if necessary.
• an electrical signal comprising information relating to the wavelengths to be inserted and extracted is transmitted to the selection module by an electrical plug separate from the electrical plug adapted to transmit the incoming and outgoing electrical signals.
• the rising and falling wavelengths that the device must use can be communicated to it without passing through the port of the OLT, which has the advantage of being able to select the wavelengths in advance, at the manufacturer of the device for example, before the operation of connecting the device in the port of the OLT, and to be able to modify the wavelengths independently of the port of the OLT, if necessary, even if the device is connected to the port of the OLT.
• the optical connectors are able to connect removably to bidirectional optical fibers.
• a standard optical connector can be used such for example two LC-type optical connectors, which allows easy connection and disconnection of optical fibers on the optoelectronic transceiver device, and lower production and installation costs.
• the various aspects of the optoelectronic transceiver device which have just been described can be implemented independently of one another or in combination with each other.
• the invention also relates to a system for connecting a plurality of optical line terminal ports to an optical distribution network, the optical line terminal ports being connected to an optoelectronic transceiver device such as that which has just been the devices of the plurality being connected to one another by forming a cascade, the second optical connector of a cascade device being connected by optical fiber to the first optical connector of a following device in the cascade, the first optical connector. the first device of the cascade being connected to the optical distribution network by an optical fiber.
• Such a system is advantageous because it makes it possible to eliminate the WM boxes and all their interfaces with the TWDM and WDM OLT ports. Simply connect any of the optoelectronic transceiver devices in the OLT ports to the CEx box, then connect the other devices cascading to it in any order. This system therefore also offers great flexibility for the planning and evolution of the optical distribution infrastructure, as well as a very easy installation of the OLT ports.
• the invention relates to an optoelectronic transmission-reception method between a first optical connector adapted to be connected to a first bidirectional optical fiber, and a second optical connector adapted to be connected to a second bidirectional optical fiber, the method comprising the steps following: • extraction of a wavelength in a plurality of wavelengths constituting a first optical signal received by the first optical connector; Transmitting the first optical signal without the extracted wavelength to the second optical connector;
• This method implements all aspects of the optoelectronic transceiver device according to the invention which has just been described.
• FIG. 1 shows a mixed optical distribution infrastructure, according to the prior art
• FIG. 2 shows a mixed optical distribution infrastructure, according to a particular embodiment of the invention
• FIG. 3 shows an optoelectronic transceiver device according to a particular embodiment of the invention
• FIG. 4 shows an exemplary implementation of a cascade of optoelectronic transceiver devices according to a particular embodiment of the invention
• FIG. 5 presents the method of receiving an optical signal implementing the receiver device according to a particular embodiment of FIG. the invention.
• Figure 1 shows an ODN-AA mixed optical distribution infrastructure, according to the prior art.
• TDM OLTs and some OLT ports TWDM or WDM knowing that their number can reach several tens or even hundreds in the same mixed optical distribution infrastructure. Similarly, only one ONU per OLT or per OLT port is illustrated, knowing that each OLT typically serves 64 or 128 ONUs.
• TDM type OLTs such as "GPON OLT” and "XGPON OLT” are connected by bidirectional interfaces respectively I FQPON and IF XG PON, on optical fiber, directly to a CEx box called "co-existence".
• Other interfaces such as the IF V ideo interface of a video headend can also be connected to the ECx box.
• the ports P1, P2 and P3 of a TWDM type OLT such as "TWDM OLT” are not connected directly to the ECx box but through a WM intermediate multiplexer / demultiplexer so that a single bidirectional IF TWDM interface, covering all channels in TWDM wavelengths on a single optical fiber, be presented to the ECx box.
• This WM element must be configured specifically for the wavelengths that the operator plans to use with its TWDM OLT ports.
• the CEx box is itself connected by a bidirectional optical fiber to one or more S couplers, positioned in series at a relatively close distance from the users served by the mixed infrastructure. A single coupler is shown here for simplicity.
• the coupler S is connected to the line optical terminals of the users, denoted "ONU GPON", "UN XGPON”, "UN TWDM”, "UN GPON + RF", etc.
• point-to-point type OLTs not illustrated in FIG. 1, each use a pair of up-and-down wavelengths, and therefore have bidirectional signals which also need to be grouped together by a WM element. It is therefore understood that according to the prior art, several WM elements may thus have to be connected to a single ECx box.
• FIG. 2 presents a mixed ODN optical distribution infrastructure, according to a particular embodiment of the invention.
• the ports P1, P2 and P3 of the OLT "TWDM OLT” are each equipped with an optoelectronic transceiver device according to the invention, denoted respectively XFP1, XFP2 and XFP3.
• This device has the particularity of taking, on a bidirectional optical signal, the rising wavelength associated with the port of the OLT, and inserting in this bidirectional optical signal the downward wavelength associated with the port of the OLT. , while leaving intact the other wavelengths of the bidirectional optical signal. Thanks to this feature, the MW element is no longer necessary because it is sufficient to connect only one of the OLT port devices to the ECx box by a bidirectional optical fiber, and then to connect the other devices in cascade to this device, for example. bidirectional optical fibers.
• FIG. 3 shows an optoelectronic transceiver device according to a particular embodiment of the invention.
• Such an XFPx device comprises the following elements or modules:
• An OC1 optical connector able to connect an OF1 optical fiber removably
• An OC2 optical connector able to connect an OF2 optical fiber removably;
• the OC1 and OC2 connectors are for example of the LC type, which makes it possible to connect and disconnect easily and independently the optical fibers OF1 and OF2;
• a wavelength insertion-extraction ADM module capable of inserting a wavelength ⁇ ⁇ into a bidirectional optical signal carried by the optical fiber OF1, able to extract a wavelength A Rx from the bidirectional optical signal carried by the optical fiber OF1, and able to let from the optical fiber OF1 to an optical fiber OF2, and vice versa, the other wavelengths of the bidirectional optical signal carried by the optical fiber OF1; such an ADM module is also known by the name "add-drop multiplexer";
• a WLS module for selecting the wavelength to be inserted ⁇ ⁇ and the wavelength to be extracted A Rx , able to receive information ⁇ ⁇ , A Rx ⁇ relating to these wavelengths and to transmit corresponding instructions to the ADM module; the selection WLS module can be included in the ADM module;
• a bidirectional optical multiplexing-demultiplexing BMDM module capable of multiplexing the wavelength ⁇ ⁇ and of demultiplexing the wavelength A Rx in the signal passing through the module ADM;
• a conversion module TE20 able to convert a downward electrical signal carrying Tx data into an optical signal of length down wave ⁇ ⁇ ;
• a conversion module R02E capable of converting a rising wavelength A Rx into a rising electrical signal carrying Rx data
• An electrical connector EC1 adapted to connect electrically and removably to an OLT port capable of transmitting a downward electrical signal carrying Tx data, the connector EC1 being connected to the module TE20;
• An electrical connector EC2 adapted to connect electrically and removably to an OLT port adapted to receive a rising electrical signal carrying Rx data, the connector EC2 being connected to the module
• the electrical connectors EC1 and EC2 are for example combined in a single connector of the same type as the electrical connector of an SFP + or XFP module, which allows to embed the entire device in a single optical module SFP + or XFP, with a only electrical connector on the front panel and two optical connectors, for example LC type, on the front panel.
• FIG. 4 shows an exemplary implementation of a cascade of optoelectronic transceiver devices according to a particular embodiment of the invention.
• the bidirectional optical signal carried by the optical fiber OF1 comprises three downward wavelengths: ⁇ ⁇ 1 , ⁇ ⁇ 2 , ⁇ ⁇ 3 , and 3 rising wavelengths: A m , A R2 , A R3 .
• the XFP1 device receives from the port P1 of the OLT TWDM an electrical signal
• the device XFP1 extracts from the bidirectional optical signal carried by the optical fiber OF1 a signal of wavelength A R1 and converts it into an electrical signal "Rx: A R1 " which it transmits to the port P1 of the OLT TWDM.
• a bidirectional optical signal identical to that carried by the optical fiber OF1, but devoid of the wavelengths ⁇ ⁇ ⁇ and A m passes through the device XFP1 and is carried by the optical fiber OF2.
• the bidirectional optical signal carried by the optical fiber OF2 thus comprises two downlink wavelengths: ⁇ ⁇ 2 , ⁇ ⁇ 3 , and two rising wavelengths: A R2 , A R3 .
• the XFP2 device receives from the P2 port of the TWDM OLT an electrical signal " ⁇ : ⁇ ⁇ 2 " that it converts into an optical signal of wavelength ⁇ ⁇ 2 that it inserts into the bidirectional optical signal carried by the optical fiber OF2 .
• the device XFP2 extracts from the bidirectional optical signal carried by the optical fiber OF2 a signal of wavelength A R2 and converts it into an electrical signal "Rx: A R2 " that it transmits to the port P2 of the OLT TWDM.
• the bidirectional optical signal carried by the optical fiber OF3 thus comprises 1 down-wavelength: ⁇ ⁇ 3 , and 1 rising wavelength: A R3 .
• the device XFP3 receives from the port P3 of the TWDM OLT an electrical signal " ⁇ : ⁇ ⁇ 3 " that it converts into an optical signal of wavelength ⁇ ⁇ 3 that it inserts into the bidirectional optical signal carried by the optical fiber OF3 .
• the device XFP3 extracts from the bidirectional optical signal carried by the optical fiber OF3 a signal of wavelength A R3 and converts it into an electrical signal "Rx: A R3 " which it transmits to the port P3 of the TWDM OLT.
• FIG. 5 presents the method of receiving an optical signal implementing the receiver device according to a particular embodiment of the invention.
• the wavelengths ⁇ ⁇ and A Rx are selected. They are specific to the OLT equipped with the device implementing the method, and respectively correspond to the downward and upward direction of the data transmission in the mixed optical distribution infrastructure. They are called for convenience wavelength respectively downward and rising.
• the rising wavelength A Rx is extracted from a first optical signal received on a first optical connector.
• the first optical signal is transmitted to a second optical connector, without the rising wavelength A Rx .
• step E4 which can be simultaneous with the step E6, the rising wavelength A Rx is converted into a rising electrical signal carrying data Rx.
• a so-called downlink electrical signal carrying data Tx intended to be transmitted in the downstream transmission direction, is converted into a falling wavelength ⁇ ⁇ .
• the falling wavelength ⁇ ⁇ is inserted in a second optical signal received on the second optical connector.
• the second optical signal is transmitted to the first optical connector, with the falling wavelength ⁇ ⁇ .
• steps E2, E3 and E4 can be simultaneous with the sequence of steps E5, E6, E7.
• An optical fiber connected to the first connector is bidirectional because it carries both the falling wavelength ⁇ ⁇ transmitted during step E6, and the rising wavelength A Rx received during step E2.
• this optical fiber is also bidirectional.
• the embodiments of the invention which have just been presented are only some of the possible embodiments. They show that the invention makes it possible to simplify an optical distribution infrastructure mixing TDM and WDM or TWDM, by equipping each port of OLT WDM or TWDM with a pluggable and removable optoelectronic transceiver device having the particularity of inserting and pick up the rising and falling wavelengths associated with the port and then cascading the devices with each other.
• the optical signal carried by the optical fiber connected to the first of the cascade covers the entire spectrum of WDM or TWDM wavelengths, and this optical fiber can be connected directly to the mixed optical distribution infrastructure, without the intermediary a wavelength multiplexer-demultiplexer as in the prior art.

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• 2014
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