WO2009107702A1 - Système de transmission de lumière, dispositif-relais de lumière, procédé et programme de commande de dispositif-relais de lumière - Google Patents

Système de transmission de lumière, dispositif-relais de lumière, procédé et programme de commande de dispositif-relais de lumière Download PDF

Info

Publication number
WO2009107702A1
WO2009107702A1 PCT/JP2009/053506 JP2009053506W WO2009107702A1 WO 2009107702 A1 WO2009107702 A1 WO 2009107702A1 JP 2009053506 W JP2009053506 W JP 2009053506W WO 2009107702 A1 WO2009107702 A1 WO 2009107702A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical
excitation light
optical repeater
repeater
subscriber terminal
Prior art date
Application number
PCT/JP2009/053506
Other languages
English (en)
Japanese (ja)
Inventor
達也 内方
Original Assignee
日本電気株式会社
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 日本電気株式会社 filed Critical 日本電気株式会社
Priority to JP2010500731A priority Critical patent/JPWO2009107702A1/ja
Publication of WO2009107702A1 publication Critical patent/WO2009107702A1/fr

Links

Images

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
    • H04B10/27—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
    • 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

Definitions

  • the present invention relates to an optical transmission system such as a PON (Passive Optical Network), an optical repeater, a control method of an optical repeater, and a program for causing a computer to execute the method.
  • PON Passive Optical Network
  • optical repeater a control method of an optical repeater
  • program for causing a computer to execute the method a program for causing a computer to execute the method.
  • the PON system is an economical system in which a transmission line fiber and a central office side terminal (OLT: Optical Line Terminal) can be shared by a plurality of subscribers.
  • OLT Optical Line Terminal
  • the number of allowable branches of splitters is increased in dense urban areas of subscribers, and the distance between OLT and subscriber network unit (ONU: Optical Network Unit) is increased in sparse sparsely populated areas of subscribers. Is required.
  • repeaters are provided to cope with so-called high loss and long distance
  • the repeaters include 3R (Reshaping, Retiming, Regenerating) repeaters and an optical repeater.
  • the 3R repeater converts an optical signal into an electrical signal, regenerates a clock from the electrical signal, and converts the electrical signal, which has been subjected to identification regeneration with the regenerated clock, into an optical signal again.
  • Optical repeaters use optical amplifiers that use stimulated emission to amplify the signal as it is.
  • the 3R relay is a technology that can be reliably realized because it is only necessary to configure the receiving unit of the OLT and the transmitting unit of the ONU, but there are problems such as large size, high cost, and reliance on bit rate.
  • the optical repeater solves the problems of the 3R repeater, the technical hurdles are high in that the optical repeater is compatible with the burst signal.
  • the signal (downlink) from the OLT to the ONU is a general continuous light
  • the signal from the ONU to the OLT (uplink) it is a so-called burst signal in which each ONU sequentially transmits a signal at a predetermined interval (guard time). Since the distance between the OLT and each ONU is different, the signal light power input to the optical repeater changes at high speed within the range of the input dynamic range. For this purpose, in order to keep the output of the optical repeater constant, the gain of the optical amplifier must be changed at high speed corresponding to the burst.
  • AGC Automatic Gain Control
  • AGC Automatic Gain Control
  • the gain is controlled to be maximized in an attempt to increase the output, but at that time, if a signal is rapidly input, the AGC control delay is It causes the light surge that is the cause.
  • An example of the object of the present invention is an optical transmission system capable of effectively preventing an optical surge even under high-speed input fluctuations such as burst signals, an optical repeater, a method of controlling an optical repeater, and a method for causing a computer to execute the method. To provide the program.
  • An optical transmission system includes an optical repeater that amplifies optical signals received from a plurality of subscriber terminals, and an excitation light source that generates excitation light for controlling the gain of the optical repeater.
  • the apparatus includes a control device that controls the terminal device to transmit the excitation light transmitted from the terminal device at the timing when it overlaps with the light signal transmitted from each subscriber terminal device.
  • an optical repeater is an optical repeater optically connected between a plurality of subscriber terminals and a controller, and an optical signal received from the plurality of subscriber terminals From each of the plurality of subscriber terminal devices according to the instruction from the control device, an optical amplification means for amplifying and outputting to the control device, an excitation light generation means for generating excitation light for controlling the gain of the optical amplification means, And control means for transmitting the excitation light to the optical amplification means at a timing overlapping with the input optical signal.
  • a control method of an optical repeater is a control method of an optical repeater for amplifying an optical signal received from a plurality of subscriber terminal apparatuses, which is for controlling the gain of the optical repeater.
  • the intensity of the excitation light is set for each of the optical signals sent from the subscriber terminal, and the excitation light is generated at a timing that overlaps with the optical signal sent from the subscriber terminal.
  • a program according to one aspect of the present invention is a program for causing a computer that controls an optical repeater that amplifies optical signals sent from a plurality of subscriber terminals to be executed, and controlling the gain of the optical repeater. Setting the intensity of the excitation light for each optical signal sent from the subscriber terminal, and causing the computer to perform processing for causing the optical repeater to generate the excitation light at a timing overlapping with the optical signal sent from the subscriber terminal It is made to run.
  • FIG. 1 is a block diagram showing the configuration of a PON system using an optical repeater according to an embodiment of the present invention.
  • FIG. 2A is a block diagram showing an example of an OLT in the first embodiment.
  • FIG. 2B is a block diagram showing an example of ONU # 0 in the first embodiment.
  • FIG. 3 is a sequence diagram showing a general discovery process.
  • FIG. 4A is a flowchart showing an excitation light control process of the OLT in the first embodiment.
  • FIG. 4B is a flowchart showing an operation of the ONU # 0 in the first embodiment.
  • FIG. 5A is a time chart showing existing excitation timings and idle time slots.
  • FIG. 5B is a time chart schematically showing the excitation light intensity adjusted by the vacant time slot.
  • FIG. 6 is a sequence diagram showing an example of the excitation timing eT # i and the transmission timing eT # i in the first embodiment.
  • FIG. 7A is a time chart showing an example of the excitation light control method according to the second embodiment.
  • FIG. 7B is a time chart showing an example of the excitation light control method according to the third embodiment.
  • FIG. 7C is a time chart showing an example of the excitation light control method according to the fourth embodiment.
  • optical splitter 11 optical coupler 12 upstream optical repeater 13 optical coupler 14 OLT 15 downstream optical repeater 16 terminal device having excitation light source (ONU # 0) DESCRIPTION OF SYMBOLS 101 Optical coupler 102 Photoelectric converter 103 CDR / DMUX 104 processing unit 105 excitation light power setting unit 106 scheduler 107 MUX 108 driver 109 light source 201 optical coupler 202 photoelectric converter 203 CDR / DMUX 204 processing unit 205 MUX 206 driver 207 light source 208 excitation light source
  • a PON system in which a plurality of subscriber terminal units ONU # 1 to #n and a central office side terminal OLT as a control device are connected through an optical splitter and an optical repeater.
  • a terminal unit ONU # 0 having an excitation light source is provided separately from the plurality of subscriber terminal units ONU # 1 to ONU # n.
  • the ONU # 0 Under control of the OLT, the ONU # 0 outputs excitation light of corresponding intensities at timings overlapping with respective upstream optical signals from the ONUs # 1 to #n, whereby each upstream optical signal input to the OLT Keep the power of
  • a registration procedure called Discovery Process is performed with the OLT.
  • the OLT separates the transmission start time by leaving a fixed interval (guard time) so that the data (uplink signal) from each ONU does not collide. Allocate transmission time.
  • the process of measuring the power of the optical signal input from each ONU to the OLT, and calculating the respective gains so as to keep the output power of the optical repeater constant is added.
  • the OLT notifies each ONU # 1 to #n of the transmission start time and the transmission time, but at the same time, the ONU # 0 has a constant optical repeater output at a timing overlapping with the signal from each ONU.
  • the optical repeater is notified to output the excitation light with the excitation light power at which the gain is obtained.
  • the gain corresponding to each ONU in the upstream optical repeater is set at high speed by feed forward, so that amplification is performed without any transient response (light surge) in the burst signal in the PON system in which the signal light level changes rapidly. It becomes possible.
  • the transmission order from each ONU is set according to the gain, and the pump light in the guard time is complemented by the pump light intensity before and after that, thereby making the gain change of the optical repeater smooth. It is also possible to reduce the optical surge due to the delay of the population inversion density of the optical amplifier.
  • the gain at the optical repeater can be changed at high speed by feedforward, so that it can be used only in a conventional optical repeater including a gain adjustment (AGC) circuit for feedback. It is possible to prevent the optical surge due to the delay of the AGC circuit being Furthermore, by smoothing the gain change of the optical repeater, it is possible to reduce the optical surge caused by the delay of the reverse distribution density of the optical amplifier.
  • AGC gain adjustment
  • FIG. 1 is a block diagram showing the configuration of a PON system using an optical repeater according to an embodiment of the present invention.
  • the upstream optical signals respectively output from the n subscriber terminal units ONU # 1 to #n are transmitted through the optical splitter 10, the optical coupler 11, the upstream optical repeater 12, and the optical coupler 13 to a central office side terminal (OLT ) Is transmitted.
  • OLT central office side terminal
  • the downstream optical signal from the OLT 14 is transmitted to the n subscriber terminal units ONU # 1 to #n through the optical coupler 13, the downstream optical repeater 15, the optical coupler 11 and the optical splitter 10.
  • the OLT 14 is basically a control device having a receiving unit, a transmitting unit, and a processing unit in the present embodiment (details will be described later).
  • the upstream optical repeater 12 and the downstream optical repeater 15 have an optical amplifier that amplifies the signal as it is by using stimulated emission.
  • a terminal device 16 having an excitation light source (hereinafter referred to as ONU # 0) is connected to the optical coupler 11, and excitation light for changing the gain of the upstream optical repeater 12 according to the control of the OLT 14 as described later.
  • the ONU # 0 basically has a receiving unit, a transmitting unit, an excitation light source, and a processing unit, and the details will be described later.
  • the ONU # 0 has basically the same configuration as the subscriber terminal units ONU # 1 to #n except for the excitation light source, and the delay process ⁇ T # 0 is first at first by the discovery process with the OLT 14 as well. It is measured.
  • the optical repeater according to the present embodiment includes the optical coupler 11, the upstream optical repeater 12, the optical coupler 13, the downstream optical repeater 15, and the ONU # 0 (broken line portion).
  • the optical coupler 11, the upstream optical repeater 12, the optical coupler 13 and the downstream optical repeater 15 may be one optical repeater, and the ONU # 0 may be connected to the optical splitter 10 and provided on the subscriber side.
  • Uplink optical signals output at respective timings from n subscriber terminal units ONU # 1 to #n are amplified by being input to the upstream optical repeater 12 at the same timing as excitation light from ONU # 0. , And output to the OLT 14 with substantially constant power.
  • FIG. 2A is a block diagram showing an example of an OLT in the present embodiment.
  • the optical signal input to the photoelectric converter 102 via the optical coupler 101 is converted into an electrical signal by the photoelectric converter 102, and is input to the CDR / DMUX 103.
  • the photoelectric converter 102 is, for example, a photodiode (PD).
  • the CDR / DMUX 103 regenerates clock and data from the output signal of the photoelectric converter 102 (CDR), performs parallel conversion (DMUX), and outputs a low-speed reception signal to the processing unit 104.
  • the OLT 14 in the present embodiment further includes a pumping light power setting unit 105 and a scheduler 106.
  • the processing unit 104 controls the excitation light power setting unit 105 and the scheduler 106 while monitoring the input power output from the photoelectric converter 102 and the synchronization error output from the CDR / DMUX 103 as described later.
  • the necessary excitation light power is calculated, and the output timing of the excitation light for each upstream optical signal is calculated.
  • the low speed data output from the processing unit 104 is serial converted by the MUX 107, and the driver 108 drives the light source 109 according to the high speed data to generate a transmission light signal, and the generated signal is transmitted through the optical coupler 101. Be done.
  • the light source 109 is, for example, a laser diode (LD).
  • the processing unit 104 also executes processing of the main signal including generation / analysis of the preamble of the transmission / reception signal, monitoring of each device, management of an alarm, and the like.
  • the types of the light source 109, the driver 108 and the photoelectric converter 102 may be different between the OLT 14 and the ONU, the basic configuration is the same.
  • the CDR / DMUX 103 and the MUX 107 may be supplied on separate chips, or may be supplied on one chip.
  • the light source 109 and the driver 108 may be an integral module, and are not limited to the configuration of FIG. 2A.
  • processing unit 104 the excitation light power setting unit 105, and the scheduler 106 implement functions equivalent to the functions described in the present embodiment by causing a program control processor such as a CPU to execute a program.
  • FIG. 2B is a block diagram showing an example of the ONU # 0 in this embodiment.
  • the optical signal input to the photoelectric converter 202 via the optical coupler 201 is converted into an electrical signal by the photoelectric converter 202, and is input to the CDR / DMUX 203.
  • the photoelectric converter 202 is, for example, a photodiode (PD).
  • the CDR / DMUX 203 recovers clock and data from the output signal of the photoelectric converter 202 (CDR), performs parallel conversion (DMUX), and outputs a low-speed reception signal to the processing unit 204.
  • the low speed data output from the processing unit 204 is serial converted by the MUX 205, and the driver 206 drives the light source 207 according to the high speed data to generate a transmission light signal, and the generated signal is transmitted through the optical coupler 201. Be done.
  • the light source 207 is, for example, a laser diode (LD). In this way, ONU # 0 becomes capable of bi-directional communication with the OLT 14.
  • the processing unit 204 also executes main signal processing including generation / analysis of preambles of transmission / reception signals, monitoring of each device, management of alarms, and the like.
  • the ONU # 0 in the present embodiment further includes the excitation light source 208.
  • the processing unit 204 controls the excitation light source 208 according to an instruction from the OLT 14, and the excitation light source 208 sends out the excitation light through the optical coupler 201 at the instructed intensity and transmission timing of the excitation light.
  • the processing unit 204 corresponds to control means in the ONU # 0.
  • the CDR / DMUX 203 and the MUX 205 may be supplied on separate chips, or may be supplied on one chip.
  • the light source 207 and the driver 206 may be an integral module, and are not limited to the configuration of FIG. 2B.
  • the delay process ⁇ T between the OLT and ONU is measured by the discovery process.
  • the measured delay time ⁇ T is used to determine the excitation light transmission timing, the discovery process will be briefly described.
  • FIG. 3 is a sequence diagram showing a general discovery process.
  • Ethernet PON Ethernet PON
  • Ethernet is a registered trademark
  • ONU # i (i is an arbitrary value of 1 to n) is newly added to the PON system, a discovery process is performed.
  • the OLT 14 transmits a Discovery Gate command including the local time T1 of the OLT 14 and OLT information.
  • ONU #i receives the Discovery Gate command, ONU #i sets the built-in clock to time T1, and sends a Register_Request command including transmission time T2 of ONU #i toward OLT 14 after a lapse of random time.
  • the processing unit 104 of the OLT 14 calculates and stores the delay time ⁇ T # i with the ONU #i from the time information of T1, T2 and T3. Then, the OLT 14 assigns a Logical Link Identifier (LLID) to the ONU #i, and a Register command for notifying the LL ID to the ONU #i, and a GATE command including a transmission start time T5 and a transmission time L. Send each
  • LLID Logical Link Identifier
  • the ONU # i When ONU # i receives the Register and GATE commands, the ONU # i transmits the Register_ACK command with LLID set to the OLT 14 during a lapse of L time from the designated time T5 to notify the LLID to the OLT 14, thereby the ONU # i's registration procedure is complete.
  • ONU #i does not receive the Register command despite sending the Register_Request command, it retransmits the Register_Request command. As a result, initial communication in the upstream direction is realized, and measurement of the delay time ⁇ T # i between the OLT 14 and the ONU # i becomes possible.
  • the delay time ⁇ T # 0 with the ONU # 0 needs to be performed first at the start of the PON system in the same process as described above.
  • the gain of the upstream optical repeater 12 is set to the optical repeater 12 and the OLT 14 so that an optical signal exceeding the dynamic range of the OLT 14 is not input. It is necessary to keep it smaller than the transmission loss during the However, in this case, the upstream optical signals from the other ONUs fall below the dynamic range of the OLT 14 and the signals from the other ONUs do not reach the OLT 14 and there is a possibility that the initial communication can not be realized.
  • the OLT 14 performs excitation light control by monitoring the presence or absence of input power and synchronization.
  • excitation light control according to the present embodiment will be described in detail with reference to FIGS. 4A to 6.
  • FIG. 4A is a flow chart showing the excitation light control process of the OLT according to the present embodiment
  • FIG. 4B is a flow chart showing the operation of ONU # 0.
  • FIG. 5A is a time chart showing the existing excitation timing and the vacant time slot
  • FIG. 5B is a time chart schematically showing the excitation light intensity adjusted by the vacant time slot.
  • excitation light # 1 is for the optical signal of ONU # 1
  • excitation light # 2 is for the optical signal of ONU # 2.
  • the processing unit 104 of the OLT 14 monitors the input power detection output from the photoelectric converter 102 to detect an optical input (step 301). If there is an optical input, whether the power is equal to or higher than a certain level It is determined whether or not (step 302).
  • the processing unit 104 determines whether synchronization has been established in the CDR / DMUX 103 (step 303). If synchronization is not achieved (step 303: YES), the processing unit 104 reaches a level at which the signal can be correctly received by the OLT 14 because the ONU #n is newly added but the gain in the upstream optical repeater 12 is small.
  • the excitation light power setting unit 105 calculates the excitation light intensity (P # n) necessary to amplify from the power received by the photoelectric converter 102 to the predetermined power that can be correctly received (step 304). .
  • the scheduler 106 of the OLT 14 determines the excitation timing eT # n corresponding to the ONU # n in a vacant time slot other than the excitation timing corresponding to the already operating ONU # 1, # 2, and so on. Then, as shown in FIG. 5B, the OLT 14 transmits a transmission timing T # n to the ONU # n, and a control signal including an instruction to raise the excitation light to the ONU # 0 to the intensity P # n at the excitation timing eT # n. Is sent (step 305).
  • the discovery process is executed with the ONU #n that has not reached the reception level. (Step 306).
  • the control signal addressed to the ONU # 0 is sent out as an optical signal from the light source 109, amplified by the downstream optical repeater 15, and reaches the ONU # 0 through the optical coupler 11.
  • the processing unit 204 of ONU # 0 determines the presence or absence of the control signal from the OLT 14 (step 401), and when the control signal is received, the excitation timing (here, eT # n) and excitation included in the instruction are received.
  • the light intensity (here, P # n) is set (step 402). Every time the excitation timing eT # i including the excitation timing eT # n set in this way is reached (Step 403: YES), the excitation light source 208 is driven with the set excitation light intensity P # i to transmit excitation light (Step 404).
  • the excitation timing eT # i and the transmission timing eT # i will be described.
  • FIG. 6 is a sequence diagram showing an example of the excitation timing eT # i and the transmission timing eT # i in this embodiment.
  • the delay time ⁇ T # n of ONU # n and the delay time ⁇ T # 0 of ONU # 0 have already been calculated and stored in the discovery process.
  • the OLT 14 transmits a GATE command (transmission start time T6, transmission time L) to the ONU # n, and at the same time, transmits a GATE command (excitation start time [T6 + ⁇ T # n- ⁇ T # 0] to the ONU # 0, excitation time L, excitation light Send the strength P # n).
  • the ONU #n that has received the GATE command (T6, L) transmits an LLID # n MAC frame of time L at time T6.
  • ONU # 0 Upon receiving the GATE command (T6 + .DELTA.T # n-.DELTA.T # 0, L, P # n), ONU # 0 excites the excitation light intensity P # n for a time L at time [T6 + .DELTA.T # n-.DELTA.T # 0] (CW) Send light
  • the excitation light transmitted by ONU # 0 at time [T6 + ⁇ T # n- ⁇ T # 0] is incident on upstream optical repeater 12 at the timing when it overlaps with the LLID # n MAC frame transmitted by ONU # n at time T6. Do.
  • the gain according to the attenuation amount from the ONU #n to the upstream optical repeater 12 is set in the optical repeater 12 by feedforward.
  • AGC feedback gain adjustment
  • each ONU calculates the amount of frames it wants to transmit and notifies the OLT 14 using the Report command.
  • the OLT 14 assembles the transmission order of Gate commands in accordance with the Report request from each ONU and the algorithm for bandwidth allocation (DBA: Dynamic Bandwidth Allocation), and sequentially transmits Gate commands to the ONU. Also send GATE command.
  • the output of the optical repeater 12 is obtained by entering the upstream optical repeater 12 at the timing when the excitation light from the ONU # 0 and the upstream optical signal from each ONU overlap while considering the delay time in the same manner as described above. It can be made constant without light surge.
  • the gain in the optical repeater 12 can be changed at high speed by feed forward. For this reason, it is possible to effectively prevent the optical surge due to the delay of the AGC circuit with respect to the high speed input level fluctuation observed in the ordinary optical repeater.
  • the excitation light is turned ON / OFF so that the timing is overlapped with the upstream optical signal, but the present invention is not limited to this, and the excitation light may be complemented between time slots. Is also possible.
  • FIG. 7A is a time chart showing an example of the excitation light control method according to the second embodiment of the present invention.
  • the excitation light time slots of the ONUs # 1 to # 4 are set, but the processing unit 204 continuously transmits the excitation light from the ONU # 0 also in the complementary regions 501 to 503 thereof.
  • the processing unit 204 continuously transmits the excitation light from the ONU # 0 also in the complementary regions 501 to 503 thereof.
  • FIG. 7B is a time chart showing an example of the excitation light control method according to the third embodiment of the present invention.
  • the rapid change in the gain is suppressed by arranging the transmission order from the ONUs # 1 to # 4 in the order of the gain in the upstream optical repeater 12.
  • the transmission order is set by the scheduler 106 in the order of the excitation light intensity (gain) set by the excitation light power setting unit 105 of the OLT 14.
  • gain set by the excitation light power setting unit 105 of the OLT 14.
  • the processing unit 204 also performs excitation from ONU # 0 also in the complementary regions 601 to 603 of the respective excitation light time slots of ONUs # 1 to # 4 arranged in ascending order of gain. Light is sent out continuously.
  • the pumping light by changing the pumping light to be successively smaller (or larger) continuously, an abrupt change in gain can be suppressed, and an optical surge caused by the delay of the population inversion density of the optical amplifier in the optical repeater 12 can be obtained. Can be reduced. As a result, even when the timings of the upstream signal light and the excitation light are shifted, it is possible to prevent the absence of signal light.
  • FIG. 7C is a time chart showing an example of the excitation light control method according to the fourth embodiment of the present invention.
  • the excitation light time slots of the ONUs # 1 to # 4 are set, but the excitation light is continuously transmitted from the ONU # 0 also in the complementary regions 701 to 703 thereof.
  • the guard time is set long when the gain difference between the signals from the ONUs is equal to or greater than a predetermined value.
  • the processing unit 204 lengthens the guard time between them. Therefore, the change of the pump light in the complementary region 703 between the pump lights # 3 and # 1 becomes more gradual, the rapid change of the gain is suppressed, and the light surge due to the delay of the population inversion density of the optical amplifier is reduced. Be done.
  • the optical amplifier of the optical repeater generally forms a population inversion by excitation light and amplifies an optical signal by stimulated emission, a light surge occurs due to a response delay of the population inversion density.
  • the transmission order from each ONU is set according to the gain, and the excitation light in the guard time is complemented by the excitation light intensities before and after that. Therefore, as an example of the effect of the present invention, it is possible to smooth the gain change of the optical repeater and reduce the light surge caused by the delay of the population inversion density of the optical amplifier.
  • the present invention is applicable to an optical repeater in a PON system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computing Systems (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention se rapporte à un système de transmission de lumière comprenant : un dispositif-relais de lumière (12) qui amplifie la lumière transmise depuis une pluralité de dispositifs terminaux abonnés (ONU #1 à #n) ; un dispositif terminal (16) comportant une source de lumière d'excitation qui génère une lumière d'excitation pour commander le gain du dispositif-relais de lumière (12) ; et un dispositif de commande (OLT 14) qui commande le dispositif terminal (16) de manière à transmettre la lumière d'excitation au moment où la lumière d'excitation est superposée par un signal optique transmis depuis les dispositifs terminaux abonnés respectifs.
PCT/JP2009/053506 2008-02-28 2009-02-26 Système de transmission de lumière, dispositif-relais de lumière, procédé et programme de commande de dispositif-relais de lumière WO2009107702A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2010500731A JPWO2009107702A1 (ja) 2008-02-28 2009-02-26 光伝送システム、光中継装置、光中継器の制御方法およびプログラム

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-047137 2008-02-28
JP2008047137 2008-02-28

Publications (1)

Publication Number Publication Date
WO2009107702A1 true WO2009107702A1 (fr) 2009-09-03

Family

ID=41016090

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2009/053506 WO2009107702A1 (fr) 2008-02-28 2009-02-26 Système de transmission de lumière, dispositif-relais de lumière, procédé et programme de commande de dispositif-relais de lumière

Country Status (2)

Country Link
JP (1) JPWO2009107702A1 (fr)
WO (1) WO2009107702A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011211548A (ja) * 2010-03-30 2011-10-20 Nippon Telegr & Teleph Corp <Ntt> 光中継増幅器、光通信システム及び光中継増幅器監視方法
JP2011211549A (ja) * 2010-03-30 2011-10-20 Nippon Telegr & Teleph Corp <Ntt> 光中継増幅器、光通信システム及び光通信方法
JP2015165537A (ja) * 2014-03-03 2015-09-17 富士通株式会社 光増幅中継器及び光送信局
WO2024088644A1 (fr) * 2022-10-28 2024-05-02 British Telecommunications Public Limited Company Réseau d'accès aux télécommunications amélioré

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6734826B2 (ja) * 2017-09-11 2020-08-05 日本電信電話株式会社 励起光パワー制御装置、バースト光増幅システム及びバースト光増幅方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5895437A (ja) * 1981-12-02 1983-06-07 Nec Corp 時分割光パルスデコ−ド装置
JP2002057627A (ja) * 2000-08-10 2002-02-22 Nec Corp 光通信システム及び光受信レベル調整方法
WO2002082702A1 (fr) * 2001-04-05 2002-10-17 Nortel Networks Limited Programmation de creneaux temporels pour reseaux de communications a support partage
JP2003248252A (ja) * 1992-10-16 2003-09-05 Fujitsu Ltd 波長分散を補償した光通信システム及び該システムに適用可能な位相共役光発生装置
JP2004015243A (ja) * 2002-06-04 2004-01-15 Sumitomo Electric Ind Ltd 光データ通信ネットワーク
WO2004106971A1 (fr) * 2003-05-30 2004-12-09 Mitsubishi Denki Kabushiki Kaisha Radar a laser coherent
JP2005006313A (ja) * 2003-06-09 2005-01-06 Samsung Electronics Co Ltd 受動光通信網の光パワー等化装置
JP2005084041A (ja) * 2003-09-11 2005-03-31 Nippon Telegr & Teleph Corp <Ntt> 光伝送システムの伝送損失測定装置、およびその方法
JP2007324954A (ja) * 2006-06-01 2007-12-13 Sumitomo Electric Ind Ltd 波長多重中継装置及びこれを用いた光通信システム

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5895437A (ja) * 1981-12-02 1983-06-07 Nec Corp 時分割光パルスデコ−ド装置
JP2003248252A (ja) * 1992-10-16 2003-09-05 Fujitsu Ltd 波長分散を補償した光通信システム及び該システムに適用可能な位相共役光発生装置
JP2002057627A (ja) * 2000-08-10 2002-02-22 Nec Corp 光通信システム及び光受信レベル調整方法
WO2002082702A1 (fr) * 2001-04-05 2002-10-17 Nortel Networks Limited Programmation de creneaux temporels pour reseaux de communications a support partage
JP2004015243A (ja) * 2002-06-04 2004-01-15 Sumitomo Electric Ind Ltd 光データ通信ネットワーク
WO2004106971A1 (fr) * 2003-05-30 2004-12-09 Mitsubishi Denki Kabushiki Kaisha Radar a laser coherent
JP2005006313A (ja) * 2003-06-09 2005-01-06 Samsung Electronics Co Ltd 受動光通信網の光パワー等化装置
JP2005084041A (ja) * 2003-09-11 2005-03-31 Nippon Telegr & Teleph Corp <Ntt> 光伝送システムの伝送損失測定装置、およびその方法
JP2007324954A (ja) * 2006-06-01 2007-12-13 Sumitomo Electric Ind Ltd 波長多重中継装置及びこれを用いた光通信システム

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011211548A (ja) * 2010-03-30 2011-10-20 Nippon Telegr & Teleph Corp <Ntt> 光中継増幅器、光通信システム及び光中継増幅器監視方法
JP2011211549A (ja) * 2010-03-30 2011-10-20 Nippon Telegr & Teleph Corp <Ntt> 光中継増幅器、光通信システム及び光通信方法
JP2015165537A (ja) * 2014-03-03 2015-09-17 富士通株式会社 光増幅中継器及び光送信局
WO2024088644A1 (fr) * 2022-10-28 2024-05-02 British Telecommunications Public Limited Company Réseau d'accès aux télécommunications amélioré

Also Published As

Publication number Publication date
JPWO2009107702A1 (ja) 2011-07-07

Similar Documents

Publication Publication Date Title
US8571058B2 (en) Terminal apparatus, data transmission system and data transmission method
JP5490517B2 (ja) 光通信システム、光通信方法およびｏｌｔ
US20100196010A1 (en) Optical transmission system
US20120057876A1 (en) Method for amplifying a burst optical signal, burst optical amplifier and system, and communications system
JP2007151086A (ja) 受動型光加入者網
JP2009077280A (ja) パッシブ光ネットワークシステムおよびレンジング方法
US20110116798A1 (en) Optical communication network and supervisory control device
WO2009107702A1 (fr) Système de transmission de lumière, dispositif-relais de lumière, procédé et programme de commande de dispositif-relais de lumière
US11804909B2 (en) Power saving mechanisms for high speed passive optical network
KR20140011544A (ko) 이상 ｏｎｔ 검출 및 배제 방법
US8280252B2 (en) Subscriber terminal of adjusting intensity of optical signal by controlling attenuation, and a method thereof
JP5460253B2 (ja) 親局側光送受信装置および光加入者伝送システム
JP2013255086A (ja) マルチレートｐｏｎシステム、その局側及び宅内光回線終端装置
JP5822038B1 (ja) 光送信器、加入者側装置、及び光源の温度変化抑制方法。
JP5899866B2 (ja) 光中継増幅装置及び方法
CN102932697B (zh) 无源光网络及其低功耗控制方法和光网络单元
JP2009100426A (ja) 信号監視装置、通信システム、信号監視方法、および信号監視装置のプログラム
JP2008199233A (ja) 光受信装置及び方法並びに局側光終端装置
JP2011101116A (ja) 光中継器、光通信システム、及び光中継器の制御方法
WO2010095582A1 (fr) Système de transmission en multiplexage par répartition temporelle et procédé de commande de ce système
JP2012015866A (ja) 双方向光増幅器並びにこれを用いたｐｏｎシステム及び通信方法
JP5084629B2 (ja) 加入者終端装置および電源制御方法
JP2009171434A (ja) Ａｓｏｎシステムとこれに使用する光スイッチ装置及び局側装置
WO2021093185A1 (fr) Détection et récupération rapides d&#39;une unité de réseau optique indésirable à l&#39;aide d&#39;un signal de réinitialisation
JP6734826B2 (ja) 励起光パワー制御装置、バースト光増幅システム及びバースト光増幅方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09714912

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2010500731

Country of ref document: JP

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 09714912

Country of ref document: EP

Kind code of ref document: A1