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WO2018171595A1 - Procédé de transmission de données et terminal de ligne optique - Google Patents

Procédé de transmission de données et terminal de ligne optique Download PDF

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Publication number
WO2018171595A1
WO2018171595A1 PCT/CN2018/079697 CN2018079697W WO2018171595A1 WO 2018171595 A1 WO2018171595 A1 WO 2018171595A1 CN 2018079697 W CN2018079697 W CN 2018079697W WO 2018171595 A1 WO2018171595 A1 WO 2018171595A1
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WIPO (PCT)
Prior art keywords
signal
optical module
system side
module
burst
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Ceased
Application number
PCT/CN2018/079697
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English (en)
Chinese (zh)
Inventor
陆建鑫
郭勇
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ZTE Corp
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ZTE Corp
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Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Publication of WO2018171595A1 publication Critical patent/WO2018171595A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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 disclosure relates to the field of data communications, and more particularly to data transmission methods and optical line terminations.
  • the optical access network is an important part of the next generation network and a major direction for the development of optical communication technology in the future.
  • the optical access network has great application prospects, and its broadband service is also growing.
  • PON passive optical networks
  • P2MP point-to-multipoint
  • ONT optical line terminal
  • ONU optical network unit
  • ODN optical distribution network
  • the burst uplink data signal of the PON puts higher requirements on the OLT as the receiving end.
  • the optical module below 10G is directly sent to the medium access control (PON MAC) of the system through the burst mode transimpedance amplifier and the burst mode limiting amplifier.
  • the PON MAC generally has a built-in burst mode clock data recovery (BCDR) function to recover (restore) the upstream optical signal.
  • BCDR burst mode clock data recovery
  • PON OLT optical modules are generally pluggable.
  • the present disclosure provides a communication method between a high-speed pluggable PON OLT optical module and a system, provides a stable and reliable transmission connection scheme, and simplifies PON MAC chip design.
  • a data transmission method for use in an optical line terminal, where the optical line terminal includes an optical module and a system side module, and the data transmission method includes: when there is a burst uplink signal, The optical module sends the burst uplink signal to the system side module; and when there is no burst uplink signal, the optical module sends an idle signal to the system side module.
  • an optical line terminal including an optical module and a system side module, and when there is a burst uplink signal, the optical module sends the burst uplink signal to The system side module sends the idle signal to the system side module when there is no burst uplink signal.
  • FIG. 1 is a flowchart of a data transmission method according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of an optical line terminal according to an embodiment of the present disclosure
  • FIG. 3 is a schematic structural diagram of another structure of an optical line terminal according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic diagram of an insertion feature code.
  • the present disclosure provides a data transmission method, which is applied to an optical line terminal, where the optical line terminal includes an optical module and a system side module, and the data transmission method includes: Step 100, in a burst uplink signal The optical module sends the burst uplink signal to the system side module. In step 200, when there is no burst uplink signal, the optical module sends an idle signal to the system side module.
  • the optical module when there is no burst uplink signal, the optical module sends the idle signal to the system side module, where the optical module detects the received signal to obtain a detection signal; When the no-burst uplink signal is indicated, the optical module sends an idle signal to the system-side module.
  • the optical module when the optical module sends the idle signal to the system side module, the optical module generates a zero-crossing indication signal according to the received signal, specifically, the The optical module detects a zero-crossing signal of the received signal, and sets the zero-crossing indication signal to be valid when the zero-crossing signal exceeds a preset threshold; when the zero-crossing indication signal is valid, The optical module sends an idle signal to the system side module.
  • the idle signal is a signal with better pattern balance, and the pattern balance can be set within a predetermined range, for example, between 0.3 and 0.7, and the idle signal can be preset.
  • the periodic signal can also be set to other signals, as long as it is set to maintain the AC signal between the optical module and the system side module (ie, to avoid clock loss between the optical module and the system side module).
  • the idle signal can be set to an alternate code stream signal of 0 and 1.
  • the AC frequency signal is maintained between the optical module and the PON MAC during the uplink burst, so that the clock of the PON MAC as the receiving end does not lose lock, and does not need to receive the uplink data signal every time.
  • the system data (including clock data) is restored first, which improves the reliability of the system transmission.
  • the system side no longer needs complex burst mode clock data recovery function, which simplifies the design of the PON MAC chip.
  • the BCDR function needs to be added to both the optical module and the system side, thereby improving signal quality.
  • the BCDR function is added to both the optical module and the system side.
  • the preamble requirement for signal transmission is more demanding.
  • the optical module and the system side are required to execute the burst mode clock data. Recovery features increase the complexity of the system design.
  • the system side by inserting an idle signal when there is no uplink data signal (ie, uplink idle, no burst uplink signal), the system side receives the quasi-continuous signal, so the system side MAC does not need the BCDR function. This simplifies the design of the PON MAC chip.
  • the optical module when forwarding the uplink data signal of the low rate channel, the optical module may select to send the uplink data signal of the low rate channel to the system side module through the high rate channel.
  • the uplink data signal of the low rate channel By transmitting the uplink data signal of the low rate channel to the system side module through the high rate channel, only one data transmission channel needs to be set between the optical module and the system side module, and the data transmission channel has a high transmission rate and various rates.
  • the data signals can be transmitted through the data transmission channel, which simplifies system design and improves data transmission reliability.
  • the low rate data signals can be matched (mapped) to the high rate channels in a number of ways.
  • a repeated code stream may be used, for example, an 8-bit or 10-bit data slice is repeated an integer multiple, and then the next data slice is transmitted. If the high rate is not an integer multiple of the low rate, you need to consider other mapping methods. You only need to make the agreement at both ends of the communication.
  • the transmission rate of the high-rate channel is 20 Gbit/s
  • the rate of the low-rate channel is 10 Gbit/s.
  • each data slice is repeatedly transmitted twice, and the system-side module receives the data.
  • the data signal is known, the data signal is a data signal with a rate of 10 Gbit/s, and then a piece of data is forwarded, and duplicate pieces of data are discarded.
  • mapping methods may be employed.
  • the feature code may be inserted before the data slice, the start position of the data slice is identified by the feature code, and then filled by the idle code, thereby mapping the low-rate data slice to the high-rate channel.
  • Three mapping modes are specifically described below.
  • Manner 2 When the optical module receives the data slice of the low rate channel, insert the first feature code before the data slice, insert the second feature code after the data slice, and then send the signal to the system side module through the high rate channel;
  • the start position of the data piece may be identified by the first feature code
  • the end position of the data piece may be identified by the second feature code. Since the size of the data piece is fixed, only the first feature may be adopted.
  • the code identifies the starting position of the piece of data.
  • Manner 3 When the optical module receives the data slice of the low rate channel, insert the first feature code before the data slice, insert the second feature code and the idle code after the data slice, and then send the system to the system through the high rate channel. Side module.
  • the optical module in an embodiment of the present disclosure includes a burst mode clock data recovery unit that recovers a received signal, the burst mode clock data
  • the source of the reference clock of the recovery unit includes any one of the following methods: a reference clock provided by the reference oscillator inside the optical module; a reference clock extracted by the optical module from the received signal; and a reference provided by the system directly to the optical module clock.
  • an embodiment of the present disclosure further provides an optical line terminal (OLT).
  • OLT optical line terminal
  • the OLT includes an optical module 10 and a system side module, and the system side module includes a PON. MAC 20.
  • the optical module 10 includes a BCDR unit 11, a control unit 12, an adaptation unit 13, an output unit 14, and a clock unit 15, and the optical module 10 may further include a signal amplification unit (not shown).
  • the OLT After receiving the signal sent by the ONU, the OLT first amplifies the signal through a burst mode transimpedance amplifier and a burst mode limiting amplifier to form a reference signal.
  • the BCDR unit 11 is configured to receive a reference signal amplified by a burst mode transimpedance amplifier and a burst mode limiting amplifier, and recover the reference signal.
  • the BCDR unit 11 receives the reference clock transmitted by the clock unit 15, and generates a zero-crossing indication signal based on the recovered signal, and transmits the zero-crossing indication signal to the control unit 12.
  • the BCDR unit 11 detects a zero-crossing signal of the recovered signal, and sets the zero-crossing indication signal to be valid when the zero-crossing signal exceeds a preset threshold.
  • the control unit 12 receives the detection signal obtained by detecting the signal received by the optical module 10 and the zero-crossing indication signal, and instructs the adaptation unit 13 to output an uplink data signal according to the detection signal and the zero-crossing indication signal. Still output an idle signal.
  • the adaptation unit 13 inserts an idle signal, and in other cases, forwards the burst recovered by the BCDR unit 11. Send an upstream signal.
  • the adaptation unit 13 is configured to receive the indication signal sent by the control unit 12, and send the idle signal or the burst uplink signal recovered by the BCDR unit 11 to the output unit 14 according to the indication signal.
  • the output unit 14 outputs the data signal output from the adaptation unit 13.
  • the clock unit 15 is for providing a reference clock, and in the embodiment of the present disclosure, the source of the reference clock provided by the clock unit 15 includes any one of the following: a reference clock provided by a reference oscillator inside the optical module (for example, The clock unit 15 is a reference oscillator); the reference clock extracted by the optical module from the received signal; the system directly adjusts the reference clock provided to the optical module.
  • the embodiment of the present disclosure further provides another OLT.
  • the PON MAC unit 20 sends a rate indication signal to the BCDR unit 11 in the optical module 10.
  • the BCDR unit 11 restores the received data signal by the rate indication signal, so that the transmission rate is not required to be parsed each time the data signal transmitted by the ONU is received, and the uplink data signal can be recovered (restored) more quickly.
  • the PON MAC unit 20 can also transmit a rate indication signal to the adaptation unit 13 so that the adaptation unit 13 can insert and output a suitable uplink signal.
  • the adaptation unit 13 is configured to receive the indication signal sent by the control unit 12, and send the idle signal or the burst uplink signal recovered by the BCDR unit 11 to the output unit 14 according to the indication signal.
  • the adaptation unit 13 maps the low-rate data slice to the high-rate channel in an agreed manner, for example, mapping the low-rate data slice to the high rate in one of the following three manners. aisle.
  • Manner 1 The adapting unit 13 inserts the first feature code before the data piece.
  • Manner 2 The adapting unit 13 inserts a first feature code before the data piece, and inserts a second feature code after the data piece.
  • Manner 3 The adapting unit 13 inserts a first feature code before the data slice, and inserts a second feature code and an idle code after the data slice.
  • the adaptation unit 13 when the adaptation unit 13 receives the low-speed data slice A, the signature 1 is inserted before the low-speed data slice A, and then the signature 1 and the low-speed data slice A are transmitted on the high-speed channel, after the data transmission is completed. Inserting the feature code 2 and the idle code after the low-speed data slice A, and transmitting the feature code 2 and the idle code.
  • the adaptation unit 13 receives the low-speed data slice B, the feature code 1 is inserted before the low-speed data slice B, Then, the signature 1 and the low-speed data slice B are transmitted on the high-speed channel. After the data transmission ends, the signature 2 and the idle code are inserted after the low-speed data slice B, and the signature 2 and the idle code are transmitted.
  • the feature code 1 and the feature code 2 are predetermined codes that can be distinguished from ordinary data signals and can be identified.
  • the PON MAC When the PON MAC receives the data signal and searches for "Signature 1", it can determine the starting position of the data slice, thereby recovering (restoring) the low-speed data signal stream.
  • the "unit” and “module” in the present disclosure may be implemented by software, hardware or a combination thereof, which may be, for example, a processor.
  • Embodiments of the present disclosure also provide a computer storage medium storing a computer program for performing a data transmission method of an embodiment of the present disclosure.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention concerne un procédé de transmission de données et un terminal de ligne optique. Le procédé de transmission de données comprend les étapes suivantes : lorsqu'un signal de liaison montante en rafale existe, envoyer le signal de liaison montante en rafale à un module côté système au moyen d'un module optique ; et lorsque le signal de liaison montante en rafale n'existe pas, envoyer un signal d'inactivité au module côté système au moyen du module optique.
PCT/CN2018/079697 2017-03-21 2018-03-21 Procédé de transmission de données et terminal de ligne optique Ceased WO2018171595A1 (fr)

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CN201710170305.0A CN108632682B (zh) 2017-03-21 2017-03-21 一种数据传输方法和光线路终端
CN201710170305.0 2017-03-21

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CN110225423B (zh) * 2019-06-28 2021-10-22 苏州浪潮智能科技有限公司 一种交换机系统的自适应光信号速率的方法、设备和介质

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CN1988433A (zh) * 2005-12-23 2007-06-27 华为技术有限公司 一种无源光网络维护方法及光网络单元和光线路终端
US20110001531A1 (en) * 2009-07-01 2011-01-06 Kawasaki Microelectronics, Inc. Method and apparatus for receiving burst data without using external detection signal
CN104301121A (zh) * 2013-07-19 2015-01-21 中兴通讯股份有限公司 一种控制方法、装置及光收发器
CN105991320A (zh) * 2015-02-05 2016-10-05 中兴通讯股份有限公司 无源光网络设备告警信息处理方法及光线路终端

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CN101364844B (zh) * 2007-08-10 2011-03-30 华为技术有限公司 在无源光网络中实现拉远传输数据的装置
CN101729154B (zh) * 2008-11-03 2012-04-18 华为技术有限公司 实现lr-pon的方法、装置及系统
CN104836622B (zh) * 2015-03-27 2019-05-21 上海欣诺通信技术股份有限公司 一种gpon链路放大器及其控制方法

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CN1988433A (zh) * 2005-12-23 2007-06-27 华为技术有限公司 一种无源光网络维护方法及光网络单元和光线路终端
US20110001531A1 (en) * 2009-07-01 2011-01-06 Kawasaki Microelectronics, Inc. Method and apparatus for receiving burst data without using external detection signal
CN104301121A (zh) * 2013-07-19 2015-01-21 中兴通讯股份有限公司 一种控制方法、装置及光收发器
CN105991320A (zh) * 2015-02-05 2016-10-05 中兴通讯股份有限公司 无源光网络设备告警信息处理方法及光线路终端

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CN108632682B (zh) 2022-07-15
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