WO2009012699A1 - Appareil et procédé permettant d'amplifier des signaux optiques dans un résau optique passif et un terminal de ligne optique - Google Patents

Appareil et procédé permettant d'amplifier des signaux optiques dans un résau optique passif et un terminal de ligne optique Download PDF

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Publication number
WO2009012699A1
WO2009012699A1 PCT/CN2008/071674 CN2008071674W WO2009012699A1 WO 2009012699 A1 WO2009012699 A1 WO 2009012699A1 CN 2008071674 W CN2008071674 W CN 2008071674W WO 2009012699 A1 WO2009012699 A1 WO 2009012699A1
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WIPO (PCT)
Prior art keywords
optical signal
optical
control information
signal
upstream
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PCT/CN2008/071674
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English (en)
Chinese (zh)
Inventor
Limin Dong
Chan Zhao
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Huawei Technologies Co., Ltd.
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Publication of WO2009012699A1 publication Critical patent/WO2009012699A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers
    • 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
    • H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
    • H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
    • H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
    • H04B10/0773—Network aspects, e.g. central monitoring of transmission parameters
    • 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
    • H04B10/27—Arrangements for networking
    • 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
    • H04B10/27—Arrangements for networking
    • H04B10/272—Star-type networks or tree-type networks

Definitions

  • the present invention relates to the field of optical communications, and more particularly to an amplifying apparatus and method for optical signals in a passive optical network and an optical line termination.
  • the PON Passive Optical Network
  • BPON Broadband Passive Optical Network
  • GPON Gigabit Passive Optical Network
  • IEEE Institute of Electrical and Electronics Engineers
  • the PON of various systems has basically the same network architecture.
  • the OLT Optical Line Terminal
  • the Optical Network Unit ONU
  • the OLT and the ONU are passive.
  • the ODN Optical Distribution Network
  • the OLT and the passive optical splitter are connected by a trunk fiber, and the optical splitter realizes point-to-multipoint optical power distribution and is connected to multiple ONUs through multiple branch fibers.
  • the direction from the OLT to the ONU is called the downlink direction
  • the direction from the ONU to the OLT is called the uplink direction.
  • the point-to-multipoint tree topology of PON determines that each ONU must communicate with the OLT in a shared medium.
  • the downlink signal of the OLT is sent to all ONUs through TDM (Time Division Multiplexing) broadcast, and uses specific identifiers, such as virtual channels for BPON.
  • the identifier, the EPON logical link identifier, the GPON virtual channel identifier, and the allocation identifier indicate which ONU each time slot belongs to.
  • the optical signal power of all the information of all ONUs is divided into several parts at the optical splitter to reach each ONU via each branch fiber. Each ONU collects its own data according to the corresponding identifier, and the data of other time slots are discarded.
  • the uplink direction of the ONU is accessed by time division multiple access.
  • each ONU Under the control of the OLT, each ONU transmits its own uplink signal only in the time slot designated by the OLT, and the time slots of the ONUs meet at the optical splitter.
  • the PON system ensures that the uplink signals of the ONUs do not collide through the ranging and multiple access control. Since each ONU reaches the optical splitter along different branch fibers, the distances of different branch fibers are different. For example, the maximum distance difference between the ONUs of GPON is 20 km. Therefore, the attenuation of the optical power is different, and the optical power of the ONU optical transmitter is also inconsistent.
  • the optical power of the uplink signals of different ONUs reaches the optical splitter by up to 10 dB, and is rapidly changing (near two
  • the protection interval between the uplink signals of the ONUs is only 25 ns), which is called the burst uplink signal.
  • next-generation optical access networks raises the need for PONs to be extended, so that optical transmission achieves a system target of 10 Gbps symmetric rate, 100 km transmission distance, and 512 split ratio.
  • the remoteness of the PON is conducive to the integration of the access network and the metropolitan area network, reducing the number of network nodes, and further reducing maintenance costs.
  • the OLT adds a wavelength division multiplexer WDM to the backbone fiber at the remote node optical splitter for separating the uplink signal with a wavelength of 1310 nm and the downlink signal with a wavelength of 1490 nm, and one for each of the uplink and downlink signals.
  • the EDFA erbium doped fiber amplifier
  • the OLT of the architecture can be located at the core network node, and the distance from the ONU reaches 100 km.
  • the advantage of using an optical amplifier is that the delay to the signal is small.
  • the downlink signal of the PON is in continuous mode, and it is more suitable to use EDFA amplification.
  • the problem with this technology is that the uplink signal of the PON is in burst mode, and the transmitted optical powers of different ONUs are different, and the branch fibers of different distances reach the optical splitter, and experience different link attenuation. Therefore, the uplink signals of different ONUs are The optical power of the splitter is different, the difference is up to 10dB, and the guard interval between the uplink signals of two adjacent ONUs is only 25ns.
  • the typical transient effect response time constant of an EDFA is on the order of microseconds. The sudden rise of the uplink signal after the EDFA is amplified will cause a surge, resulting in signal distortion.
  • the upstream signal of the wavelength ⁇ ⁇ from the ONU arrives before the EDFA located at the remote node, and firstly passes a small part of the optical power input optical receiver through a coupler, and the controller determines a light according to the received optical power.
  • the compensation value drives a laser with a wavelength of ⁇ ⁇ , and ⁇ ⁇ and ⁇ ⁇ are two different wavelengths.
  • the signal light of ⁇ ⁇ is input to the EDFA together with the control light of ⁇ ⁇ for amplification, and ⁇ e is filtered out at the output end of the EDFA, and the amplified ⁇ ⁇ signal light is transmitted to the OLT.
  • the principle of gain clamping is that the signal light of ⁇ ⁇ and the control light of ⁇ ⁇ share the gain of the EDFA, while the pump power of the EDFA remains unchanged, so the EDFA is ⁇ ⁇ the signal light and ⁇ . The amount of gain provided by the control light remains the same.
  • the optical receiver (PD) detects the signal light power of ⁇ ,, and dynamically changes the magnitude of the control light power of ⁇ c emitted by the laser (LD ) through the controller, so that both the signal light and the control light are input to the optical power of the EDFA. And keep constant, so the gain of the ⁇ ⁇ signal light is kept constant, thus eliminating the surge caused by the EDFA transient effect.
  • a problem with the above techniques is that the use of gain-clamped amplifiers introduces additional cost increases, requires the addition of lasers, receivers, and the addition of optical filters at the output of the EDFA.
  • a series of processing procedures such as uplink optical power reception, decision, and adjustment of the laser output power need to be completed in the instant when the uplink optical power arrives, which is technically difficult.
  • the embodiment of the invention provides an amplifying device, an amplifying method and an optical line terminal for an optical signal in a PON, so as to solve the amplification problem of the uplink burst signal, that is, dynamically adjusting the upstream optical signal amplifier by using the control information in the downlink optical signal.
  • the pump current is sized to achieve equalized gain of the upstream burst optical signals of different powers.
  • an embodiment of the present invention provides an optical line terminal, where the light Road terminals include:
  • a ranging unit configured to measure a delay of the optical signals of the plurality of optical network units to the upstream optical signal amplifier, and calculate, according to the delay, different time times when the optical signals sent by the multiple optical network units reach the upstream optical signal amplifier;
  • control information generating unit configured to generate control information for controlling amplification of the uplink optical signal according to the ranging result;
  • the control information includes a list of amplification gain values corresponding to the different times;
  • a combiner configured to synthesize a service signal and the control information into an electrical signal
  • the optical transceiver module is configured to convert the electrical signal into an optical signal as a downlink optical signal output.
  • An embodiment of the present invention further provides an amplifying device for an optical signal in a passive optical network, where the amplifying device includes:
  • control information extracting unit configured to receive a downlink optical signal from the optical line terminal, and extract control information from the downlink optical signal
  • a pumping unit configured to generate a pump current of the upstream optical signal amplifier according to the control information
  • an upstream optical signal amplifier configured to receive the pump current, and amplify the uplink optical signal according to the pump current.
  • An embodiment of the present invention further provides an amplifying method for a passive optical network, where the method includes: obtaining, according to a delay of an optical signal of each optical network unit to an upstream optical signal amplifier, and an uplink optical signal sent by each optical network unit. Generating control information for controlling amplification of the upstream optical signal at different times of the upstream optical signal amplifier;
  • the upstream optical signals arriving at different times are amplified according to the pump current.
  • the above embodiments of the present invention are applicable to the remote amplification problem of the passive optical network, and can effectively solve the amplification problem of the uplink burst signal.
  • the remote amplifier can be monitored and managed by the control information including the uplink time information of the upstream optical signals of the optical network units. Compared with the existing amplifier gain clamping technology, the technical solution of the embodiment of the invention is reduced in cost.
  • FIG. 1 is a structural diagram of a PON system in the prior art
  • FIG. 2 is a schematic diagram of implementation of using an optical amplifier in a PON in the prior art
  • FIG. 3 is a schematic diagram of an amplifier gain clamping technique used in the prior art 2;
  • FIG. 4 is a schematic structural diagram of an optical line terminal according to Embodiment 1 of the present invention.
  • FIG. 6 is a schematic structural diagram of a system for amplifying an optical signal in a PON according to Embodiment 3 of the present invention
  • FIG. 7 is a flowchart of a method for amplifying an optical signal in a PON according to Embodiment 4 of the present invention
  • Figure 9 is a flow chart showing the generation of pump current for controlling an upstream optical signal amplifier based on control information according to Embodiment 4 of the present invention.
  • Embodiments of the present invention provide an amplifying device, an amplifying method, and an optical line terminal for an optical signal in a PON, and dynamically adjusting a pumping current of an upstream optical signal amplifier by using control information in a downlink optical signal to implement different power uplinks.
  • the purpose of the equalization gain of the signal is a simple device, a single-transmitter, a single-transmitter, and a single-transmitter-to-to-to-optical signal.
  • Embodiment 1 of the present invention provides an optical line terminal, where the optical line terminal includes: a ranging unit 101, which is connected to the control information generating unit 102, the combiner 103, and the optical transceiver module 104, and is used for measurement. a delay of the optical signals from the plurality of optical network units to the upstream optical signal amplifier, and calculating, according to the delay, the different times when the optical signals sent by the plurality of optical network units reach the upstream optical signal amplifier Engraved
  • the ranging unit 101 performs ranging at the initial time, including measuring the delay of the optical signals of all the ONUs to the OLT and the delay of the optical signals of the upstream optical signal amplifiers to the OLT, thereby calculating the optical signals of the respective ONUs to the upstream optical signal amplifiers. Delay.
  • the ranging unit 101 allocates an uplink time slot to all the ONUs according to the dynamic bandwidth allocation algorithm, and writes the uplink time slot allocation result of all the ONUs into the downlink frame to notify each ONU of the time slot of the uplink optical signal, and The ranging result obtained by copying one ranging and the uplink time slot allocation result are output to the control information generating unit 102.
  • the control information generating unit 102 is connected to the ranging unit 101, the optical transceiver module 104, and the combiner 103, and configured to generate control information for controlling amplification of the uplink optical signal according to the ranging result;
  • the control information is generated according to the delay of the optical signal of each ONU to the upstream optical signal amplifier and the different time when the uplink optical signal sent by each optical network unit reaches the upstream optical signal amplifier.
  • the control information includes a list of amplification gain values corresponding to the different times.
  • the amplification gain value corresponds to a timing at which the uplink optical signal reaches the upstream optical signal amplifier, and the delay of the optical signal corresponding to the uplink optical signal to the upstream optical signal amplifier is larger, the greater the gain value is. The smaller the delay, the smaller the gain value.
  • the amplification gain value is a larger value at the i-th time.
  • the amplification gain value is a small value at the jth time. It is worth noting that since the OLT knows in advance the uplink time slots of all ONUs, the control information is not sent until the i or jth time, but is sent out in advance enough time.
  • a combiner 103 connected to the control information generating unit 102 and the ranging unit 101, for synthesizing the service signal and the control information into an electrical signal;
  • the combiner 103 converts the control information, for example, performing time division multiplexing to generate an electrical signal for outputting to the ranging unit; and in the uplink direction, the combiner 103 is for ranging.
  • the signal output by the unit passes directly without any processing;
  • the optical transceiver module 104 is connected to the ranging unit 101 and the control information generating unit 102, and is configured to convert the electrical signal into an optical signal for output as a downlink optical signal.
  • the power information extraction module in the optical transceiver module 104 can also extract the uplink optical signal, in order to achieve the equalization gain of the uplink optical signal, because the uplink power of the different ONUs is different.
  • the power information is used to dynamically adjust control information for controlling the amplification of the upstream optical signal, thereby performing equalization gain on the uplink optical signal.
  • control information generating unit 102 in addition to generating the control information for controlling the amplification of the upstream optical signal according to the ranging result, initially, after the actual service transmission starts, the control information adjusting module in the control information generating unit 102 will also be
  • the uplink direction receives the power information in the uplink optical signal output by the power information extraction module to dynamically adjust the control information.
  • the embodiment 2 provides an amplifying device for an uplink optical signal in a PON, including:
  • the control information extracting unit 201 is connected to the pumping unit 202, receives the downlink optical signal from the optical line terminal, and extracts control information from the downlink optical signal to the pumping unit 202; the pumping unit 202, and the uplink
  • the optical signal amplifier 203 is connected to receive the control information output by the control information extracting unit 201 to generate a pump current of the upstream optical signal amplifier 203;
  • the upstream optical signal amplifier 203 is connected to the pumping unit 202, receives the pump current generated by the pumping unit 202, and amplifies the upstream optical signal according to the pumping current.
  • the control information extracting unit 201 specifically includes:
  • the optical receiver 204 is connected to the control unit 205, receives the downlink optical signal from the optical line terminal, and converts the downlink optical signal into an electrical signal;
  • the control unit 205 is connected to the pump unit 202 and receives an electrical signal from the optical receiver 204. And extracting control information from the electrical signal.
  • the upstream optical signal is sent from the optical network unit ONU and is a burst mode signal. After being separated by WDM, it is input into the uplink optical amplifier.
  • the power information of the uplink optical signal can be extracted to dynamically adjust the control information for controlling the amplification of the uplink optical signal, thereby performing equalization gain on the uplink optical signal.
  • the uplink signal output optical power of ONU1 and ONU2 is substantially flat to achieve effective amplification of the uplink burst signal of the PON.
  • the upstream optical signal amplifier described in Embodiment 2 of the present invention may use an EDFA (Doped Fiber Catenary Amplifier), a TDFA (Ytterbium Doped Fiber Amplifier) or an SOA (Semiconductor Optical Amplifier).
  • EDFA Doped Fiber Catenary Amplifier
  • TDFA Ytterbium Doped Fiber Amplifier
  • SOA semiconductor Optical Amplifier
  • an amplifying device for an uplink optical signal in a PON is provided.
  • the amplifying device can be separately used for amplifying an uplink optical signal, and can also be combined with a downstream optical signal amplifier to form an integrated amplifying device.
  • the amplification of the upstream optical signal and the downstream optical signal any embodiment that uses the spirit of the present invention and does not depart from the essence of the present invention is within the scope of the present invention.
  • the present invention provides an amplifying system for optical signals in a PON in which an amplifying device and an optical line terminal are applied in the embodiment of the present invention, including:
  • the optical line terminal 301 is configured to generate control information to be output in the downlink optical signal, or extract power information in the uplink optical signal in an uplink direction to dynamically adjust the control information;
  • the remote amplifying device 302 is configured to receive the downlink optical signal, and extract the control information to amplify the uplink optical signal.
  • the service signal becomes a data signal after being processed by mapping, multiplexing, framing, and the like. Number output.
  • the control information generating unit issues control information, and the control information and the data signal input combiner perform time division multiplexing, and the multiplexed control signal and the data signal input ranging unit perform framing and the like, and perform electro-optical conversion through the optical transceiver module. 1490nm downstream optical signal, input into PON fiber;
  • the WDM is separated using a wavelength division multiplexer.
  • the downstream optical signal (including the control information) from the OLT splits a small portion of the optical power and most of the optical power, and most of the optical power is amplified by the downstream optical signal amplifier, and a small portion of the optical power is input to the optical receiver.
  • the control unit After being converted into an electrical signal, the control unit is input, and the control unit extracts the control information and generates a pump current adjustment amount to the pump unit, and the pump unit adjusts the pump current of the upstream optical signal amplifier according to the adjustment amount.
  • the 1310 nm upstream optical signal from one or more ONUs is separated using a wavelength division multiplexer WDM.
  • the upstream optical signal is amplified by the upstream optical signal amplifier and output from the PON optical fiber;
  • the upstream optical signal After the upstream optical signal passes through the wavelength division multiplexer WDM, it enters the optical line terminal 301.
  • the signal amplified by the upstream optical signal amplifier is input to the optical transceiver module for photoelectric conversion into an electrical signal, and the optical transceiver module extracts power information input control information of the burst signal from a small portion of the electrical signal.
  • the generating unit, the control information generating unit dynamically adjusts the control information according to the power information; the majority of the input ranging unit of the electrical signal performs processing such as deframing, and finally performs processing such as demultiplexing and demapping, and restores to a service signal.
  • Embodiment 4 of the present invention provides a method for amplifying an optical signal in a PON, and the specific steps are as follows:
  • Step 101 According to the delay of the optical signal of each optical network unit to the upstream optical signal amplifier, and the uplink optical signal sent by each optical network unit calculated according to the delay, the uplink optical signal amplifier is obtained. At different times, generating control information for controlling amplification of the upstream optical signal;
  • the initial time ranging is performed, including measuring the delay of the optical signals of all the ONUs to the OLT and the delay of the optical signals of the upstream optical signal amplifiers to the OLT, thereby calculating each ONU to the upstream optical signal amplifier. The delay of the optical signal.
  • the upstream optical signal amplifier is located in the remote amplifier device.
  • All the ONUs are allocated an uplink time slot according to the dynamic bandwidth allocation algorithm, and the uplink time slot allocation result of all the ONUs is written into the downlink frame, and each optical network unit is notified to issue a time slot of the uplink optical signal.
  • the control information is generated according to the delay of the optical signal of each ONU to the upstream optical signal amplifier and the different time that the upstream optical signal transmitted by each optical network unit reaches the upstream optical signal amplifier.
  • the control information includes a list of amplification gain values corresponding to the different times.
  • the amplification gain value corresponds to a timing at which the uplink optical signal reaches the upstream optical signal amplifier, and the delay of the optical signal corresponding to the uplink optical signal to the upstream optical signal amplifier is larger, the greater the gain value is. The smaller the delay, the smaller the gain value.
  • Step 102 Synthesize the downlink service signal and the control information into a downlink optical signal output.
  • Step 103 Receive the downlink optical signal and extract the control information, and generate, according to the control information, a control for the uplink optical signal amplifier. Pump current
  • the amplifier control signal is not sent until the i or jth time, but is sent out in advance enough time.
  • control information is extracted and stored in an internal memory before the upstream optical signal reaches the upstream optical signal amplifier.
  • Step 104 Amplify the upstream optical signals arriving at different times according to the pump current.
  • the prior art only provides the ranging technology of the OLT to the ONU, which is completed by the ranging unit of the OLT, but the ranging of the remote amplifier is not available in the prior art.
  • the embodiment of the present invention provides the technical solution according to the present invention.
  • the OLT measures the distance measurement of the remote amplifier, as shown in FIG. 8.
  • the step of measuring the delay of the optical signal from the remote amplifier to the optical line terminal OLT specifically includes:
  • Step a The optical line terminal notifies an optical network unit to send uplink continuous light, and turns off all other optical network units;
  • Step b The optical line terminal sends a downlink ranging grant signal, and records the initial time T1;
  • Step c The remote amplifier receives the downlink ranging grant signal and converts it into an electrical signal;
  • Step d parsing the outgoing ranging grant signal, and suddenly changing the pumping current significantly, so that the continuous continuous light of the uplink generates a sudden rising edge or falling edge;
  • Step e when the optical line terminal detects that the continuous continuous light of the uplink generates a sudden rising edge or a falling edge, the time T2 at this time is recorded;
  • Step f Calculate the round-trip time of the remote amplifier to the optical line terminal is T2-T1, and obtain the delay of the optical signal as ( ⁇ 2- ⁇ 1) /2, and calculate the distance from the remote amplifier to the optical line terminal by the round-trip time.
  • step 103 the step of receiving the downlink optical signal and extracting the control information, and generating a pump current for controlling the upstream optical signal amplifier according to the control information specifically includes:
  • Step 103a Receive the downlink optical signal and convert the downlink optical signal into an electrical signal;
  • Step 103b Extract the control information from the electrical signal, and store the information in an internal memory;
  • Step 103c Generate a pump current adjustment amount output according to the electrical signal
  • Step 103d Adjust the pump current of the upstream optical signal amplifier according to the pump current adjustment amount. For example, in the protection time before the upstream optical signal from the ONUi reaches the upstream optical signal amplifier at the i-th time, the control unit extracts the gain value of the control information at the ith time to generate a pump current. The adjustment amount is sent to the pump unit, and the pump unit increases the pump current so that the pump current of the upstream optical signal amplifier increases at the ith time; the upstream optical signal from the ONUj reaches the upstream optical signal at the jth time.
  • the control unit extracts the gain value of the control information at the jth time, generates a pump current adjustment amount and sends it to the pump unit, and the pump unit reduces the pump current so that the upstream optical amplifier is at the jth The pump current at each moment is reduced.
  • the optical power of the uplink signals of different ONUs arrives at different levels of the splitter.
  • the power information of the uplink optical signal can be extracted to dynamically adjust the method control signal. , thereby equalizing the gain of the upstream optical signal.
  • the initial gain value is not dynamically adjusted, so using the initial gain value to amplify the upstream optical signal may not achieve the desired result.
  • the power information of the uplink optical signal is used to dynamically adjust the amplifier control signal, and each of the uplink optical signals is repeatedly extracted. Since the control signal is also repeatedly extracted, the dynamic adjustment is repeated until stable.
  • Working status The upstream light of all ONUs is the same optical power after amplification.
  • the uplink signal output optical power of ONU1 and ONU2 is substantially flat, thereby realizing effective amplification of the uplink burst signal of the PON.
  • the above embodiments of the present invention are applicable to the remote amplification problem of the passive optical network, and can effectively solve the amplification problem of the uplink burst signal, and solve the gain control of the uplink optical signal amplifier to solve the problem that the uplink burst signal passes through the upstream optical signal amplifier.
  • the problem of the surge phenomenon is finally realized, and the equalization gain is finally realized.
  • the control information includes the uplink time information of the uplink optical signals of the network elements, and the remote amplifier can be monitored and managed. Compared with the existing amplifier gain clamping technology, the present invention is implemented. The technical solution costs are reduced.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
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Abstract

L'invention concerne un appareil et un procédé permettant une amplification à distance dans un réseau optique passif et un terminal de ligne optique en ce qui concerne un champ de communication optique et qui comprennent les étapes suivantes : la génération d'un message de commande pour commander l'amplification de signaux optiques de liaison montante selon le retard des signaux optiques entre les unités de réseau optique et l'amplificateur de signal optique de liaison montante et l'autre moment d'arrivée des signaux optiques de liaison montante entre les unités de réseau optique et l'amplificateur de signal optique de liaison montante ; la transmission du signal optique de liaison descendante composé d'un signal de service de liaison descendante et dudit message de commande ; la réception dudit signal optique de liaison descendante, l'extraction dudit message de commande et la génération d'un courant de pompe pour commander ledit amplificateur de signal optique de liaison montante selon ledit message de commande ; l'amplification des signaux optiques de liaison montante arrivant à un autre moment selon ledit courant de pompe. La surveillance et la gestion de l'amplification à distance dans un PON ainsi que le réglage dynamique du gain desdits signaux de rafale de liaison montante pour une égalisation sont réalisés dans cette invention. Le plan de cette invention jouit d'un coût inférieure par comparaison avec la technique de stabilisation de gain existante des amplificateurs.
PCT/CN2008/071674 2007-07-20 2008-07-17 Appareil et procédé permettant d'amplifier des signaux optiques dans un résau optique passif et un terminal de ligne optique WO2009012699A1 (fr)

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CN200710076083.2 2007-07-20
CN 200710076083 CN101350670B (zh) 2007-07-20 2007-07-20 一种用于无源光网络中光信号的放大装置和方法以及光线路终端

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EP4024729A4 (fr) * 2019-11-12 2022-12-14 Huawei Technologies Co., Ltd. Récepteur, terminal de ligne optique et système de réseau optique passif

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