WO2024088644A1 - Réseau d'accès aux télécommunications amélioré - Google Patents

Réseau d'accès aux télécommunications amélioré Download PDF

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Publication number
WO2024088644A1
WO2024088644A1 PCT/EP2023/075194 EP2023075194W WO2024088644A1 WO 2024088644 A1 WO2024088644 A1 WO 2024088644A1 EP 2023075194 W EP2023075194 W EP 2023075194W WO 2024088644 A1 WO2024088644 A1 WO 2024088644A1
Authority
WO
WIPO (PCT)
Prior art keywords
head end
optical amplifier
data transmissions
remote end
optical
Prior art date
Application number
PCT/EP2023/075194
Other languages
English (en)
Inventor
Andrew Lord
Original Assignee
British Telecommunications Public Limited Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Telecommunications Public Limited Company filed Critical British Telecommunications Public Limited Company
Publication of WO2024088644A1 publication Critical patent/WO2024088644A1/fr

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Classifications

    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
    • H04B10/2916—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing using Raman or Brillouin amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
    • H01S3/06729—Peculiar transverse fibre profile
    • H01S3/06737—Fibre having multiple non-coaxial cores, e.g. multiple active cores or separate cores for pump and gain
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H01S3/06762—Fibre amplifiers having a specific amplification band
    • H01S3/06775—S-band amplifiers, i.e. amplification in the range of about 1450 nm to 1530 nm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H01S3/1301—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers
    • H01S3/13013—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers by controlling the optical pumping
    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/293—Signal power control
    • H04B10/2933—Signal power control considering the whole optical path
    • H04B10/2939—Network aspects
    • 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
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/293—Signal power control
    • H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
    • H04B10/296—Transient power control, e.g. due to channel add/drop or rapid fluctuations in the input power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0221—Power control, e.g. to keep the total optical power constant
    • H04J14/02216—Power control, e.g. to keep the total optical power constant by gain equalization
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0221—Power control, e.g. to keep the total optical power constant
    • H04J14/02218—Centralized control
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H01S3/06762—Fibre amplifiers having a specific amplification band
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
    • H01S3/2383—Parallel arrangements
    • H01S3/2391—Parallel arrangements emitting at different wavelengths

Definitions

  • PONs Passive Optical Networks
  • Such PONs comprise optical fibres linking the customer equipment, via a passive splitter, to a local exchange.
  • the local exchange is in turn connected to a central exchange.
  • the present invention provides a method in which these and/or other disadvantages of the prior art are overcome and/or substantially mitigated.
  • a method of operating a telecommunications access network having a head end and a remote end, The head end and remote end being adapted for optical data transmission therebetween via an optical amplifier,
  • the head end having access to a schedule of transmission information relating to a plurality of data transmissions scheduled to occur between the head end and the remote end,
  • the method comprising, at the head end, obtaining, from the schedule of transmission information, information relating to one of the plurality of data transmissions between the head end and the remote end; Using the obtained information to determine an amount of pump power to be supplied to the optical amplifier;
  • Embodiments of the invention enable a method to be performed in which the power of the optical amplifier can be adjusted for each incoming transmission using a schedule of transmissions.
  • the attenuation of an optical signal depends on factors such as transmission path length. This means, for example, that the signals from remote Optical Network Units (ONUs) will have a lower signal power at the optical amplifier than signals from less remote ONUs. Receiving signals of varying power can cause harmful “transients” in the amplifier, increasing the “dead time” that must be allowed between transmissions.
  • Embodiments of the present invention enable the equalisation of signal power at the amplifier, reducing the occurrence of transients.
  • the head end may comprise a central exchange.
  • the central exchange may be a metro node.
  • the remote end may comprise an Optical Network Unit (ONU).
  • the Optical Network Unit may be located at a customer premises.
  • the remote end may comprise a plurality of Optical Network Units.
  • the one of the plurality of data transmissions may be transmitted from the remote end to the head end.
  • the one of the plurality of data transmissions may be transmitted from the head end to the remote end.
  • the information relating to the one of the plurality of data transmissions may be information related to the power of the one of the plurality of data transmissions.
  • the information relating to one of the plurality of data transmissions may comprise a path length for the transmission.
  • the path length may be the distance from the head end to the Optical Network Unit.
  • the information relating to one of the plurality of data transmissions may comprise a transmission power of the Optical Network Unit.
  • the information relating to one of the plurality of data transmissions may comprise an amount of data contained in the one of the plurality of data transmissions.
  • the determined amount of pump power may be the amount of pump power required by the optical amplifier to amplify the one of the plurality of data transmissions such that:
  • the power of the one of the plurality of data transmissions is substantially the same as the power of the remainder of the plurality of data transmissions between the head end and the remote end.
  • the schedule of transmission information may contain information relating to transmissions occurring between the head end and remote end over a period of time, which may be one hour, one day, one week or some other period of time.
  • the schedule of transmission information may contain information relating to transmissions between the head end and a plurality of Optical Network Units.
  • the plurality of Optical Network Units may comprise more than 10 Optical Network Units and may comprise more than 100 Optical Network Units.
  • the schedule of transmission information may contain information relating to a plurality of future transmissions between the head end and the plurality of Optical Network Units.
  • the plurality of future transmissions may comprise more than 10 transmissions, or more than 100 transmissions or more than 1000 transmissions.
  • the power source may be located in the central exchange.
  • the power source may be a laser.
  • the step of supplying the determined amount of pump power to the optical amplifier may take place over a dedicated supply channel, which may be a hollow core fibre.
  • the hollow core fibre may be tuned so as to minimise losses at the wavelength of operation of the laser.
  • the pump power may be supplied to the optical amplifier over a hollow-core fibre arranged to carry the pump signal from a pump signal source to the gain material of the optical amplifier.
  • the wavelength of the pump signal may be suitable for pumping the gain material such that it is capable of performing stimulated emission for amplifying the data signals.
  • the hollow-core fibre may provide low signal attenuation over an operative range of wavelengths and the pump signal has a wavelength that is within the operative range of wavelengths.
  • a head end of a telecommunications access network the head end being adapted for optical data communication with a remote end of the telecommunications access network via an optical amplifier
  • the head end comprising a schedule of transmission information relating to a plurality of data transmissions scheduled to occur between the head end and the remote end,
  • the head end further comprising a power controller, the power controller being adapted to: obtain, from the schedule of transmission information, information relating to one of the plurality of data transmissions between the head end and the remote end; determine an amount of pump power to be supplied to the optical amplifier using the obtained information; supply the determined amount of pump power from a power source to the optical amplifier.
  • a telecommunications access network having a head end, a remote end and an optical amplifier
  • the head end and remote end being adapted for optical data transmission therebetween via the optical amplifier,
  • the head end comprising a schedule of transmission information relating to a plurality of data transmissions scheduled to occur between the head end and the remote end,
  • the head end further comprising a power controller, the power controller being adapted to: obtain, from the schedule of transmission information, information relating to one of the plurality of data transmissions between the head end and the remote end; determine an amount of pump power to be supplied to the optical amplifier using the obtained information; supply the determined amount of pump power from a power source to the optical amplifier.
  • Fig 1 is a schematic view of a known customer access network PON
  • Fig 2 is a schematic view of an optical amplifier of a PON configured to perform the method of the invention
  • Fig 3 is a schematic view of a hollow core fibre
  • Fig 4 a more detailed view of the optical amplifier of Fig 2;
  • Fig 5 is a schematic view of the components of a metro node of a PON configured to perform the method of the invention.
  • Fig 1 shows a known PON 1 as part of an access network.
  • Multiple ONlls 2 located in customer premises are connected by optical fibre to a passive splitter 3, which is connected by optical fibre to a local exchange 5.
  • the local exchange 5 is connected to a central exchange, labelled as metro node 4.
  • the local exchange 5 provides broadband services to the ONlls 2 over the optical fibres.
  • Fig 2 shows a PON in accordance with an embodiment of the invention.
  • the ONUs connect to the central exchange (referred to as the metro node 4) via an optical amplifier 7.
  • the upstream signals i.e. the signals transmitted by the ONUs to the metro node 4) have wavelengths in the 0 band.
  • the upstream signals then pass through an 0 band amplifier 9.
  • the 0 band amplifier 9 receives pump power from a first pump laser 10 located in the metro node 4 over a first hollow core fibre 31 .
  • the pump power pumps the gain material in the 0 band amplifier 9 so that the arrival of the upstream signals stimulate light emission from the gain material in the 0 band amplifier, amplifying the upstream signals.
  • the amplified upstream signals then pass through a multiplexer 11 to enable them to share a fibre with downstream signals coming in the opposite direction.
  • the upstream signals then arrive at an OLT 6 at the metro node 4.
  • the downstream signals (i.e. the signals transmitted by the metro node 4 to the ONUs) have wavelengths in the S band.
  • the downstream signals then pass through an S band amplifier 12.
  • the S band amplifier receives pump power from a second pump laser 13 located in the metro node 4 over a second hollow core fibre 32.
  • the pump power pumps the gain material in the S band amplifier 12 so that the arrival of the downstream signals stimulate light emission from the gain material in the S band amplifier, amplifying those downstream signals.
  • the amplified downstream signals then pass through a multiplexer 8 to enable them to share a fibre with upstream signals coming in the opposite direction.
  • the downstream signals then pass through a splitter (not shown) and arrive at the ONlls (not shown).
  • the first and second hollow core fibres are “tuned” to give low attenuation at the wavelength of the pump light.
  • Hollow core fibres are known in the art and so their structure and function will not be described in detail here. However, in essence, a hollow core fibre provides light propagation with minimal attenuation for certain wavelengths, those wavelengths depending on the precise dimensions of the fibre.
  • the hollow core fibres 31 and 32 can be of either the photonic bandgap type or the anti-resonant type.
  • FIG. 3 A schematic view of a cross section through an example of an anti-resonant hollow core fibre is shown in Fig 3.
  • the fibre comprises a central hollow (i.e. airfilled core 33) surrounded by cladding.
  • the cladding comprises an outer glass layer 34 and an inner layer of eight silica rods 35.
  • Fig 4 shows the optical amplifier in more detail.
  • the pump power received from the first pump laser passes through the first hollow core fibre 31 and a multiplexer 14 to combine the pump light with the 0 band (upstream) signal.
  • the multiplexer 14 outputs the pump light and upstream signal to the gain material 15 of the 0 band amplifier. Together the multiplexer 14 and gain material 15 define the 0 band amplifier 9 shown in Fig 2.
  • the pump power received from the second pump laser passes through the second hollow core fibre 32 and a multiplexer 16 to combine the pump light with the downstream signal.
  • the multiplexer 16 outputs the pump light and downstream signal to the gain material 17 of the S band amplifier.
  • the ONlls transmit signals to the metro node according to a schedule.
  • a copy of this schedule is contained in a lookup table.
  • the first pump laser transmits a burst of pump light (a pump burst) to the 0 band amplifier. This pumps the gain material in the 0 band amplifier.
  • the ONU then transmits the scheduled signal, which passes through the 0 band amplifier.
  • the now amplified signal has sufficient power to reach the metro node.
  • Fig 5 is a schematic representation of the components for controlling the pump power within the metro node 2.
  • the metro node 2 contains an intensity determiner 18, a lookup table 19, a first pump controller 20 and a second pump controller 21.
  • the lookup table 19 contains a schedule of forthcoming transmissions from the ONUs. This includes the time at which each ONU will transmit scheduled signals and the amount of data that each ONU will transmit in the scheduled transmission.
  • the lookup table also contains the length of the fibre connecting each ONU to the optical amplifier.
  • the first 20 and second 21 pump controllers are operable to control the output intensity of the first 10 and second 13 pump lasers respectively.
  • the remote node is able to control the output intensity of the first 10 and second 13 pump lasers depending on information contained in the lookup table 19 concerning the transmitting ONU.
  • the intensity determiner 18 reads from the lookup table 19 to determine which ONU will be the next to transmit an upstream signal.
  • the intensity determiner 18 also reads the length of the fibre to which the next ONU to transmit is connected. Using this length, the intensity determiner determines the gain required to be applied to the signal by the O band amplifier 9 to overcome the attenuation that the signal will suffer.
  • the intensity determiner determines the amount of laser pump power required to provide the determined gain and instructs the first pump laser 10 to transmit pump light to the O band amplifier 9 at the determined power. The first pump laser 10 then does so, and the upstream signal is transmitted and then amplified to the determined extent.
  • the lookup table indicates that one of the most remote ONlls will be the next ONU to transmit. This means that the signal transmitted by the ONU will likely be fairly heavily attenuated by the time it reaches the optical amplifier 7.
  • the lookup table 19 indicates that one of the least remote ONUs will be the next to transmit, the signal transmitted by the ONU will likely be only lightly attenuated by the time it reaches the optical amplifier 9.
  • the processor 18 instructs the first pump controller 20 to transmit a pump burst of smaller than average intensity to the O band amplifier. This lower-intensity pump burst provides the O band amplifier 9 a gain which is smaller than that provided by a pump burst of average intensity. The resulting output signal is less heavily amplified than the average signal.
  • This method of adjusting the intensity of the pump signal in accordance with the degree of attenuation suffered by the upstream signal causes the signals output by the O band amplifier 9 to be of more uniform intensity. This reduces the harmful transients suffered by the O band amplifier and reduces the “dead time” that must be allowed between successive transmissions.
  • the intensity determiner 18 reads from the lookup table 19 to determine which ONU will be the recipient of the next downstream signal to be sent from the metro node 4.
  • the intensity determiner 18 also reads the length of the fibre to which that ONU is connected. Using this length, the intensity determiner determines the gain required to be applied to the signal by the S band amplifier 12 to overcome the attenuation that the signal will suffer.
  • the intensity determiner 18 determines the amount of laser pump power required to provide the determined gain and instructs the second pump laser 13 to transmit pump light to the S band amplifier 12 at the determined power. The second pump laser 13 then does so, and the downstream signal is transmitted and then amplified to the determined extent.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention concerne un procédé de fonctionnement d'un réseau d'accès aux télécommunications ayant une extrémité de tête et une extrémité à distance, l'extrémité de tête et une extrémité à distance étant conçues pour une transmission de données optique entre celles-ci par l'intermédiaire d'un amplificateur optique, l'extrémité de tête ayant accès à un calendrier d'informations de transmission relatives à une pluralité de transmissions de données planifiées entre l'extrémité de tête et l'extrémité à distance, le procédé consistant, au niveau de l'extrémité de tête, à obtenir, à partir du calendrier d'informations de transmission, des informations relatives à l'une de la pluralité de transmissions de données entre l'extrémité de tête et l'extrémité à distance ; à utiliser les informations obtenues pour déterminer une quantité de puissance de pompage à fournir à l'amplificateur optique ; à fournir la quantité déterminée de puissance de pompage d'une source d'alimentation à l'amplificateur optique ; à transmettre l'une de la pluralité de transmissions de données entre l'extrémité de tête et l'extrémité à distance par l'intermédiaire de l'amplificateur optique.
PCT/EP2023/075194 2022-10-28 2023-09-13 Réseau d'accès aux télécommunications amélioré WO2024088644A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP22204494.3 2022-10-28
EP22204494 2022-10-28

Publications (1)

Publication Number Publication Date
WO2024088644A1 true WO2024088644A1 (fr) 2024-05-02

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009068929A1 (fr) * 2007-11-27 2009-06-04 Telefonaktiebolaget Lm Ericsson (Publ) Procédés et systèmes pour augmenter la portée et/ou la répartition dans des réseaux optiques passifs
WO2009107702A1 (fr) * 2008-02-28 2009-09-03 日本電気株式会社 Système de transmission de lumière, dispositif-relais de lumière, procédé et programme de commande de dispositif-relais de lumière

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009068929A1 (fr) * 2007-11-27 2009-06-04 Telefonaktiebolaget Lm Ericsson (Publ) Procédés et systèmes pour augmenter la portée et/ou la répartition dans des réseaux optiques passifs
WO2009107702A1 (fr) * 2008-02-28 2009-09-03 日本電気株式会社 Système de transmission de lumière, dispositif-relais de lumière, procédé et programme de commande de dispositif-relais de lumière

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