WO2009152668A1 - 提供无源光网络系统中上行突发数据的方法及装置 - Google Patents

提供无源光网络系统中上行突发数据的方法及装置 Download PDF

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Publication number
WO2009152668A1
WO2009152668A1 PCT/CN2008/073140 CN2008073140W WO2009152668A1 WO 2009152668 A1 WO2009152668 A1 WO 2009152668A1 CN 2008073140 W CN2008073140 W CN 2008073140W WO 2009152668 A1 WO2009152668 A1 WO 2009152668A1
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Prior art keywords
burst data
providing
mirroring
data
uplink burst
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PCT/CN2008/073140
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English (en)
French (fr)
Inventor
耿东玉
埃芬博格·弗兰克
梁伟光
封东宁
李靖
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP09765397.6A priority Critical patent/EP2299609B1/en
Priority to PCT/CN2009/072290 priority patent/WO2009152758A1/zh
Priority to EP12197953A priority patent/EP2573959A1/en
Priority to JP2009145215A priority patent/JP5053328B2/ja
Priority to KR1020090054227A priority patent/KR101116719B1/ko
Publication of WO2009152668A1 publication Critical patent/WO2009152668A1/zh
Priority to US12/973,639 priority patent/US8571069B2/en
Priority to HK11104606.5A priority patent/HK1150690A1/xx
Priority to US13/473,166 priority patent/US8724661B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2581—Multimode transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals
    • H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0064—Arbitration, scheduling or medium access control aspects

Definitions

  • the present invention relates to the field of passive optical network technologies, and in particular, to a method and apparatus for providing burst data in a passive optical network system.
  • PON Passive Optical Network
  • ONT Optical Line Terminal
  • ONU Opitcal Network Unit
  • ODN Optical Distribution Network
  • the point-to-multipoint multiple access protocol Since the PON uses a point-to-multipoint topology, the point-to-multipoint multiple access protocol must be used so that many ONUs can share the OLT and the backbone fiber.
  • the direction of data from the OLT to the ONU is the downlink direction
  • the direction from the ONU to the OLT is the uplink direction.
  • PON downlink ⁇ The time division multiplexing (TDM) broadcast mode and the uplink time division multiple access (TDMA) access mode are the uplink and downlink transmission modes of the currently widely used PON system.
  • the PON performs a burst-to-point burst mode (Burst) communication method.
  • the uplink transmission of the PON uses the TDMA access method to share its uplink channel.
  • the OLT allocates different time slots to each ONU.
  • the ONU only sends its own data information block in the time slot specified by the OLT.
  • the strengths of signals transmitted by different OLTs received by the OLT are also different. Therefore, after the OLT receives the burst data frame of the ONU, it is necessary for the OLT receiving end to use the synchronization mode sequence (preamble) in the frame for automatic gain (AGC) and clock recovery (Clock Data Recovery, CDR). ), then the OLT uses the Burst Delimiter and receives The burst frame is matched. When the sequence in the received frame matches the burst delimiter, the OLT can know the starting position of the data in the burst frame, thereby receiving the data.
  • AGC automatic gain
  • CDR clock recovery
  • the burst frame structure of the uplink transmission of the existing PON system defines a sequence of 0, 1 interval, binary "1010" (the hexadecimal is "0x55") as an existing sequence of synchronization patterns.
  • the synchronous mode sequence is used by the OLT to perform automatic gain and clock recovery on the received burst frame. It has been found that the spectrum of the synchronous mode sequence signal is concentrated at high frequency components, which is disadvantageous for using a low complexity equalizer at the OLT receiving end. And the frequency of the hopping is fast, which makes the existing peak detector unable to detect the actual peak value of the received signal, which may cause degradation of the receiver sensitivity.
  • Embodiments of the present invention provide a method for providing uplink burst data in a PON system, wherein the spectrum components of the synchronous mode sequence are relatively flat throughout the spectrum interval, which enables a relatively simple equalizer to be used at the receiving end of the high speed PON system.
  • An embodiment of the present invention provides a method for providing uplink burst data in a PON system, including: providing a synchronization mode sequence of uplink burst data, the sequence length of the synchronization mode being an integer multiple of 66 bits, and the 66-bit gene block is Units are connected end to end;
  • FEC Forward Error Correction
  • a burst end delimiter for the upstream burst data is provided.
  • an embodiment of the present invention provides an apparatus for providing uplink burst data in a passive optical network system, where the apparatus includes:
  • sequence length of the synchronization pattern being an integer multiple of 66 bits, which is formed by connecting 66-bit gene blocks in units;
  • the present invention further provides a signal consisting of a bit stream, which is uplink burst data in a passive optical network system, characterized in that the signal is an integer multiple of 66 bits and is 66 bits long.
  • the gene block is a sequence of synchronous patterns formed by the end-to-end unit, burst delimiter, and before It consists of error correction protected data and burst end delimiter.
  • the spectral components of the synchronous mode sequence are relatively flat throughout the spectrum interval, which enables a relatively simple equalizer to be used at the receiving end of the high speed PON system.
  • FIG. 1 is a schematic structural diagram of burst data transmitted in the uplink according to an embodiment of the present invention.
  • FIG. 2 is a gene block of an example synchronization pattern sequence of the present invention.
  • Figure 3 is a diagram showing changes in contents of a FIFO queue in accordance with an embodiment of the present invention.
  • Figure 4 is a spectrogram of a synchronized pattern sequence generated by the end of the gene 1 connection.
  • FIG. 5 is a block diagram of an apparatus for providing uplink burst data in a passive optical network system according to an embodiment of the present invention. detailed description
  • the technical solution is described by taking a 10GEPON (10G Ethernet Passive Optical Network) system as an example.
  • the uplink burst data sent by the ONU consists of a Sync Pattern, a Burst Delimiter (BD), an FEC-protected Ethernet data portion, and a Burst End Delimiter (EOB).
  • the synchronous mode sequence and the burst delimiter are not protected by FEC encoding, and the burst delimiter is followed by the FEC codeword, which is the FEC protected Ethernet data portion.
  • the burst delimiter is used to identify the beginning of the FEC-protected portion of the data in the burst.
  • the sync mode sequence is used by the OLT to perform automatic gain and clock recovery on the received burst frame.
  • the synchronization pattern sequence designed by the embodiment of the present invention is composed of 66-bit gene blocks.
  • Figure 2 provides a set of gene blocks that can be used to generate a synchronized pattern sequence as described in the embodiments of the present invention, Figure 2 Shown in the basic gene block.
  • a new gene block designing a synchronous pattern sequence can be obtained by inverting or mirroring or cyclically shifting the basic gene block shown in FIG. 2.
  • the synchronization pattern sequence designed by the embodiments of the present invention is composed of these gene blocks in units of head and tail.
  • More gene blocks that can be used to generate the synchronized pattern sequences of the present invention can be derived from the basic gene block of Figure 2.
  • the basic gene block 1 is reversed to generate a gene block:
  • the basic gene block 1 is generated by mirroring:
  • the mirroring process can be understood as a reverse processing, for example, the result of the ABCD mirroring process is DCBA.
  • the basic gene block 1 cyclic shift generates a gene block: The above is a cyclic shift 1 bit processing, and any bit can be moved in practical applications.
  • more gene blocks can be obtained by inverting, mirroring or cyclically shifting the basic gene block provided in Figure 2. And the gene block can still be obtained by reversing the basic gene block or reversing the shift after mirroring.
  • the basic gene block is:
  • the basic gene blocks provided in Figure 2 and the gene blocks obtained by the basic gene block have the following characteristics:
  • the synchronization mode sequence designed in the embodiment of the present invention has an integer multiple of 66 bits, and the synchronization mode sequence is composed of a 66-bit gene block unit end-to-end;
  • the synchronous mode sequence designed by the embodiment of the present invention is a DC balanced sequence, and the runs of 0 and 1 are the same, and the maximum run length is 6.
  • the ONU is a switch that needs to control the transmitter laser.
  • the ONU's laser should be turned off to avoid affecting the transmission of the adjacent ONU.
  • the switch of the laser is controlled by a data detector. When the data detector detects that the data to be transmitted arrives, the ONU turns on the laser.
  • a variation of the contents of the first in first out (FIFO) queue in the embodiment of the present invention describes a method of providing uplink burst data.
  • the FIFOs before and after replacement can be used as follows:
  • IDLE BD is replaced with sync burst delimiter
  • the FIFO sequence number 0 is the queue header and N-1 is the queue tail.
  • the values before and after the replacement are in block (block), which is an integer multiple of 66 bits.
  • the contents of the two FIFO blocks [N-1] and [N-2] at the end of the queue remain unchanged, and the contents of the FIFO block [N-3] It is replaced with a synchronous burst delimiter, and the contents of the FIFO blocks [N-4] to [0] are replaced with the synchronous pattern sequence designed by the present invention.
  • N is the length of the queue and is related to the synchronization time.
  • the data in the queue is then sent out in turn according to the first in first out rule.
  • the FIFO uses the first-in first-out rule, so the first is the synchronization pattern sequence of the uplink burst data.
  • the synchronization pattern sequence is used.
  • the N-3 66-bit genes 1 in FIG. 2 provided by the embodiment of the present invention are N. -3
  • a burst delimiter for the upstream burst data is then provided.
  • the portion of the FEC-protected data in the upstream burst data is then provided.
  • a burst end delimiter of the uplink burst data is provided.
  • the data of the uplink burst is finally generated, which is a signal composed of a bit stream, and the signal is a synchronous mode sequence burst formed by connecting the gene blocks of 66 bits in length.
  • the delimiter, the FEC-protected data, and the burst-end delimiter, the length of the signal is an integer multiple of 66 bits.
  • the synchronous mode sequence is a DC balanced sequence, and the runs of 0 and 1 in the binary code are the same, and the maximum run is 6.
  • the 66-bit gene block described in the application can be obtained from the basic gene block shown in Figure 2 or by inversion or mirroring or cyclic shift processing of the basic gene block, and the basic gene block is inverted or mirrored and recirculated. Gene blocks are still available.
  • the OLT receiving end After the OLT receiving end receives the burst data sent by the ONU, the OLT receiving end will use the transition between 0 and 1 of the burst synchronization mode sequence in the burst data to clock recovery and automatically receive the received data.
  • Gain The synchronous mode sequence designed by the embodiment of the present invention is a DC balanced sequence, and the run lengths of 0 and 1 are the same, and the maximum run length is 6, so that the peak detector at the receiving end can detect the peak level of the received signal close to 100%.
  • Figure 4 is a spectrogram of a synchronized pattern sequence generated by the end of the gene 1 connection. It can be seen from FIG. 4 that the spectrum of the synchronization pattern sequence of the uplink burst data in this embodiment is a solid line, and the entire spectrum interval is relatively flat. The dashed line is the spectrogram of the prior art synchronous mode sequence, and the spectral components are concentrated at high frequencies. It can be seen from the figure that the implementation has received relatively good results.
  • the embodiment of the present invention further provides a device for providing uplink burst data in a passive optical network system.
  • the device 5 includes:
  • synchronization pattern sequence length is an integer multiple of 66 bits, and is formed by a 66-bit gene block unit end-to-end connection;
  • a unit 504 that provides a burst end delimiter for the upstream burst data.
  • the synchronization mode sequence provided by the unit of the synchronization mode sequence of the uplink burst data is a DC balance sequence, and the runs of 0 and 1 in the binary code are the same, and the maximum run is 6.
  • the 66-bit gene block described in the application may be obtained by the basic gene block shown in FIG. 2 or by inversion or mirroring or cyclic shift processing of the basic gene block, and the basic gene block is inverted or mirrored and then recirculated and shifted. Gene blocks are still available.
  • the spectral components of the synchronous mode sequence designed by the apparatus of the embodiment of the present invention are relatively flat throughout the spectrum interval, so that the receiving end of the high-speed PON system can use a relatively simple equalizing crying port.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computing Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
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Description

提供无源光网络系统中上行突发数据的方法及装置
本申请要求于 2008 年 6 月 19 日提交中国专利局、 申请号为 200810068007.1、 发明名称为"提供无源光网络系统中上行突发数据的方法"的 中国专利申请的优先权， 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及无源光网络技术领域，尤其涉及一种提供无源光网络系统中上 行突发数据的方法及装置。
背景技术
无源光网络（ Passive Optical Network , PON )由于其易维护、 高带宽、 低 成本等优点成为光接入技术的佼佼者， 是通过单一平台综合接入语音、 数据、 视频等多种业务的理想物理平台。 PON技术是点到多点（P2MP )的光纤接入 技术。 PON由光线路终端（ Optical Line Terminal, OLT ) 、光网络单元（ Opitcal Network Unit, ONU )和光分配网络 ( Optical Distribution Network, ODN )组 成， 其优点来源于 ODN中的无源光分 /合路器（Splitter/Coupler ), 因而 PON 不需要使用具有放大和中继功能的元器件。
由于 PON釆用点对多点的拓朴结构， 所以必须釆用点对多点多址接入协 议使得众多的 ONU能共享 OLT和主干光纤。 PON系统中约定， 数据从 OLT 到 ONU的方向为下行方向， 从 ONU到 OLT的方向为上行方向。 PON下行釆 用时分复用 （ TDM ) 的广播方式和上行釆用时分多址接入（ TDMA ) 的接入 方式是目前应用广泛的 PON系统的上下行传输方式。
与传统的点对点连续通信方式不同， PON上行为多点到一点的突发模式 ( Burst )的通信方式。 PON的上行传输釆用 TDMA接入方式共享其上行信道。 OLT会分配不同的时隙给每个 ONU, ONU只在 OLT指定的时隙发送自己的 数据信息块。
由于在 PON系统中， 不同的 ONU和 OLT端的距离都是不一样的， 因此
OLT端接收到的属于不同 ONU所发送的信号的强度也会不同。 因此当 OLT 接收到 ONU的突发数据帧后， OLT接收端是有必要利用此帧中的同步模式序 列（前导码）进行自动增益（ Automatic Gain Control, AGC )及时钟恢复（ Clock Data Recovery, CDR ), 然后 OLT利用突发定界符（Burst Delimiter )和接收 的突发帧进行匹配， 当接收帧中的序列和突发定界符匹配上后， OLT即可知道 此突发帧中数据的起始位置， 从而进行数据的接收。
现有 PON 系统上行传送的突发帧结构将 0、 1 间隔， 二进制为" 1010..." 的序列 （其十六进制为" 0x55... " ) 定义为现有的同步模式序列。 同步模式序 列被 OLT用来对所接收的突发帧进行自动增益及时钟恢复。 实践发现该同步 模式序列信号的频谱集中在高频分量处， 这不利于在 OLT接收端使用低复杂 度的均衡器。 并且跳变的频率快， 这就使得现有的峰值检测器不能检测到所接 收信号的实际峰值， 有可能造成接收器灵敏度的退化。
发明内容
本发明实施例提供一种提供 PON系统中上行突发数据的方法， 其同步模 式序列的频谱分量在整个频谱区间都是较为平坦， 这使得高速 PON系统的接 收端可以使用较为简单的均衡器。
本发明实施例提供一种提供 PON系统中上行突发数据的方法， 包括： 提供上行突发数据的同步模式序列， 该同步模式序列长度为 66比特的整 数倍， 由以 66比特的基因块为单位首尾连接而成；
提供该上行突发数据的突发定界符；
提供该上行突发数据中受前向纠错（ Forward Error Correction, FEC )保护 的数据部分；
提供该上行突发数据的突发结束定界符。
同时本发明实施例提供一种提供无源光网络系统中上行突发数据的装置， 所述装置包括：
提供上行突发数据的同步模式序列的单元， 该同步模式序列长度为 66比 特的整数倍， 由 66比特的基因块为单位首尾连接而成；
提供该上行突发数据的突发定界符的单元；
提供该上行突发数据中受前向纠错保护的数据部分的单元；
提供该上行突发数据的突发结束定界符的单元。
进一步， 本发明还提供一种由比特流组成的信号， 该信号为无源光网络系 统中上行突发数据， 其特征在于， 所述信号由长度为 66比特的整数倍并且为 以 66比特的基因块为单位首尾连接而成的同步模式序列、 突发定界符、 受前 向纠错保护的数据及突发结束定界符组成。
应用本发明实施例所设计的上下突发数据，其同步模式序列的频谱分量在 整个频谱区间都是较为平坦， 这使得高速 PON系统的接收端可以使用较为简 单的均衡器。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施 例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地， 下面描述 中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲， 在不付 出创造性劳动性的前提下， 还可以根据这些附图获得其他的附图。
图 1为本发明实施例上行传送的突发数据的结构。
图 2为本发明是实例同步模式序列的基因块。
图 3为本发明实施例 FIFO队列中内容的变化图。
图 4为由基因 1首尾相接而生成的同步模式序列的频谱图。
图 5为本发明实施例提供无源光网络系统中上行突发数据的装置框图。 具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清 楚、 完整地描述， 显然， 所描述的实施例仅仅是本发明一部分实施例， 而不是 全部的实施例。基于本发明中的实施例， 本领域普通技术人员在没有作出创造 性劳动前提下所获得的所有其他实施例， 都属于本发明保护的范围。
本发明实施例以 10GEPON ( 10G Ethernet Passive Optical Network, 10G 以太网无源光网络）系统为例对技术方案进行描述。如图 1所示的本发明实施 例上行传送的突发数据的结构。 ONU发送的上行突发数据由同步模式序列 ( Sync Pattern )、 突发定界符 ( Burst Delimiter, BD )、 受 FEC保护的以太网 数据部分和突发结束定界符 ( EOB )构成。 其中同步模式序列和突发定界符不 受 FEC编码保护， 突发定界符其后为 FEC码字， 即受 FEC保护的以太网数据 部分。 突发定界符用来标识突发中受 FEC保护的数据部分的开始。 同步模式 序列被 OLT用来对所接收的突发帧进行自动增益及时钟恢复。
本发明实施例所设计的同步模式序列是由 66比特基因块经过扩展组成。 图 2提供了一组可用来生成本发明实施例所述的同步模式序列的基因块， 图 2 中所示的为基本基因块。由图 2所示的基本基因块通过取反或镜像或循环移位 处理可以获得新的设计同步模式序列的基因块。本发明实施例所设计的同步模 式序列由这些基因块为单位首尾相接组成。
由图 2 的基本基因块可衍生出更多可以用来生成本发明所述同步模式序 列的基因块。 例如， 基本基因块 1取反生成基因块：
0100000010111111011110011101011
基本基因块 1通过镜像处理而生成：
0101100110111011010010011100010
所述镜像处理可以理解为倒序处理， 例如 ABCD镜像处理的结果为 DCBA。 基本基因块 1循环移位生成基因块： 上述为循环移位 1位处理， 实际应用中可移任意位。
如此类推， 更多的基因块可由图 2所提供的基本基因块取反、镜像或循环 移位获得。 并且基本基因块取反或者镜像处理后再循环移位仍然可获得基因 块。
基本基因块为：
图 2 所提供的基本基因块及通过基本基因块获得的基因块均有以下的特 点：
本发明实施例所设计的同步模式序列的长度为 66比特的整数倍， 并且同 步模式序列由 66比特基因块为单位首尾相接组成；
本发明实施例所设计的同步模式序列均为直流平衡序列，并且 0和 1的游 程相同， 最大游程为 6。
在目前 10G-EPON的系统中， ONU是需要控制发送端激光器的开关的。 当 ONU没有数据传输时， ONU的激光器应该关闭以避免影响相邻的 ONU的 传送。激光器的开关是由数据检测器来控制， 当数据检测器检测到待发送数据 到达时， ONU打开激光器。
结合图 3 本发明实施例其先入先出 （FIFO ) 队列中内容的变化介绍提供 上行突发数据的方法。
替换前后的 FIFO可用如下表:
FIFO 替换前的值 替换后的值 描述
序号
N-1 扰码后 IDLE 扰码后 IDLE 该值为原 FIFO队列尾的加 扰后 IDLE
N-2 扰码后 IDLE 扰码后 IDLE 该值为原 FIFO队列尾的加 扰后 IDLE
N-3 扰码后 IDLE BD 替换为同步突发定界符
N-4 扰码后 IDLE Ox 4 BF 40 18 E5 C5 49 替换为同步模式序列 66比
BB 59 特基因块
同上
1 扰码后 IDLE Ox 4 BF 40 18 E5 C5 49 同上 0 扰码后 IDLE Ox 4 BF 40 18 E5 C5 49 同上
BB 59
(表中替换后的值用十六进制形式表示）
FIFO序号 0为队列头， N-1为队列尾。替换前后的值均以 block (数据块） 为单位， 即 66比特的整数倍。
当待发送数据到达 ONU数据检测器时，队列尾的两个 FIFO块 [N-1 ]和 [N-2] 的内容（空闲符， IDLE )保持不变， FIFO块 [N-3]的内容被替换为同步突发定 界符， 而 FIFO块 [N-4]至 [0]的内容则被替换为本发明所设计的同步模式序列。
N为队列的长度， 与同步时间有关。 然后根据先进先出的规则依次将队列中的 数据发送出去。
FIFO釆用先入先出的规则，所以首先是该上行突发数据的同步模式序列， 例如使用同步模式序列是由本发明实施例所提供的图 2中的 N-3 个 66比特的 基因 1即 N-3个
(其十六进制值为： Ox 4 BF 40 18 E5 C5 49 BB 59 )首尾相接而组成。 然后提 供该上行突发数据的突发定界符。 之后提供该上行突发数据中受 FEC保护的 数据部分。 最后提供该上行突发数据的突发结束定界符。 当 ONU的数据检测 器的 FIFO里的内容只为 IDLE时， ONU发送端将会关闭激光器。 上行突发数 据发送完成。
所以， 本实施例最终产生了上行突发的数据， 其为一种由比特流组成的信 号， 所述信号是由长度为 66比特的基因块为单位首尾连接而成的同步模式序 歹 突发定界符、 受 FEC保护的数据及突发结束定界符组成， 该信号的长度 为 66比特的整数倍。 并且所述同步模式序列为直流平衡序列， 并且其二进制 码中 0和 1的游程相同， 最大游程为 6。应用中所述 66比特的基因块可为图 2 所示的基本基因块或者由基本基因块经过取反或者镜像或者循环移位处理获 得， 并且基本基因块取反或者镜像处理后再循环移位仍然可获得基因块。
当 OLT接收端接收到由 ONU发送过来的突发数据后， OLT接收端将利 用突发数据里的突发同步模式序列的 0和 1之间的跳变对所接收的数据进行时 钟恢复和自动增益。 本发明实施例所设计的同步模式序列均为直流平衡序列， 0和 1的游程相 同， 最大游程为 6 , 使得接收端的峰值检测器可检测到所接收信号的接近 100 %的峰值水平。
由于本发明实施例所设计的同步模式序列的频谱分布在整个频谱区间都 比较平坦， 这就使得在 OLT接收端可以使用复杂度较低的均衡器。 图 4为由 基因 1首尾相接而生成的同步模式序列的频谱图。从图 4中可以看出本实施例 中上行突发数据的同步模式序列的频谱为实线， 其整个频谱区间都比较平坦。 虚线为现有技术中的同步模式序列的频谱图， 频谱分量都集中在高频。通过该 图可以看出本实施收到了较为良好的效果。
同时本发明实施例还提供了一种提供无源光网络系统中上行突发数据的 装置， 如图 5所示， 所述装置 5包括：
提供该上行突发数据的同步模式序列的单元 501 , 该同步模式序列长度为 66比特的整数倍， 由 66比特的基因块为单位首尾连接而成；
提供该上行突发数据的突发定界符的单元 502;
提供该上行突发数据中受前向纠错保护的数据部分的单元 503;
提供该上行突发数据的突发结束定界符的单元 504。
其中上行突发数据的同步模式序列的单元提供的所述同步模式序列为直 流平衡序列， 并且其二进制码中 0和 1的游程相同， 最大游程为 6。 应用中所 述 66比特的基因块可为图 2所示的基本基因块或者由基本基因块经过取反或 者镜像或者循环移位处理获得，并且基本基因块取反或者镜像处理后再循环移 位仍然可获得基因块。
釆用本发明实施例的装置所设计的同步模式序列的频谱分量在整个频谱 区间都是较为平坦， 这使得高速 PON系统的接收端可以使用较为简单的均衡 哭口
以上所述仅为本发明的几个实施例，本领域的技术人员依据申请文件公开 的可以对本发明进行各种改动或变型而不脱离本发明的精神和范围。

Claims

权 利 要 求
1、 一种提供无源光网络系统中上行突发数据的方法， 其特征在于， 包括： 提供上行突发数据的同步模式序列， 该同步模式序列长度为 66比特的整 数倍， 由 66比特的基因块为单位连接而成；
提供该上行突发数据的突发定界符；
提供该上行突发数据中受前向纠错保护的数据部分；
提供该上行突发数据的突发结束定界符。
2、 如权利要求 1所述的方法， 其特征在于， 所述同步模式序列为直流平 衡序列， 并且其二进制码中 0和 1的游程相同， 最大游程为 6。
3、 如权利要求 1所述的方法， 其特征在于， 所述 66比特的基因块用二进 制表示为： 或者由上述基因块取反或镜像或循环移位获得，或者由上述基因块取反或 镜像后再循环移位获得。
4、 如权利要求 1所述的方法， 其特征在于， 所述 66比特的基因块用二进 制表示为：
或
10:
或由以上任一基因块取反或镜像或循环移位获得，或者上述基因块取反或镜像 后再循环移位获得。
5、 一种提供无源光网络系统中上行突发数据的装置， 其特征在于， 所述 装置包括：
提供上行突发数据的同步模式序列的单元， 该同步模式序列长度为 66比 特的整数倍， 由 66比特的基因块为单位连接而成；
提供该上行突发数据的突发定界符的单元；
提供该上行突发数据中受前向纠错保护的数据部分的单元；
提供该上行突发数据的突发结束定界符的单元。
6、 如权利要求 5所述的装置， 其特征在于， 所述同步模式序列为直流平 衡序列， 并且其二进制码中 0和 1的游程相同， 最大游程为 6。
7、 如权利要求 5所述的装置， 其特征在于， 提供该上行突发数据的同步 模式序列的单元所提供的所述 66比特的基因块用二进制表示为： 或者由上述基因块取反或镜像或循环移位获得，或者由上述基因块取反或镜像 后再循环移位获得。
8、 如权利要求 5所述的装置， 其特征在于， 提供该上行突发数据的同步 模式序列的单元所提供的所述 66比特的基因块用二进制表示为：
或
Figure imgf000012_0001
或由以上任一基因块取反或镜像或循环移位获得，或者由上述基因块取反或镜 像后再循环移位获得。
9、一种由比特流组成的信号， 该信号为无源光网络系统中上行突发数据， 其特征在于， 所述信号由长度为 66比特的基因块为单位连接而成的同步模式 序列、 突发定界符、 受 FEC保护的数据及突发结束定界符组成， 该信号的长 度为 66比特的整数倍。
10、 如权利要求 9所述的信号， 其特征在于， 所述同步模式序列为直流平 衡序列， 并且其二进制码中 0和 1的游程相同， 最大游程为 6。
11、 如权利要求 9所述的信号， 其特征在于， 所述 66比特的基因块用二 进制表示为： 或者由上述基因块取反或镜像或循环移位获得，或者由上述基因块取反或 镜像后再循环移位获得。
12、 如权利要求 9所述的信号， 其特征在于， 所述 66比特的基因块用二 进制表示为：
或者由上述基因块取反或镜像或循环移位获得，或者由上述基因块取反或镜像 后再循环移位获得。
PCT/CN2008/073140 2008-06-19 2008-11-21 提供无源光网络系统中上行突发数据的方法及装置 WO2009152668A1 (zh)

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