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    • 13. 发明授权
    • Method and device for extracting a timing signal
    • 用于提取定时信号的方法和装置
    • US06204949B1
    • 2001-03-20
    • US09057597
    • 1998-04-09
    • George IshikawaHiroki OoiTakeshi Ihara
    • George IshikawaHiroki OoiTakeshi Ihara
    • H04B1000
    • H04B10/2519H04B2210/252H04L7/027H04L7/033
    • A method for extracting a timing signal produces a data signal from a first portion of an optical signal, extracts a timing signal from a second portion of the optical signal and adds dispersion compensation to at least one of the first and second portions of the optical signal to thereby control the amount of total dispersion in the second portion of the optical signal to be substantially different from the amount of total dispersion in the first portion of the optical signal. The timing signal extracting device uses a signal reproduction circuit to produce the data signal, a signal extraction circuit to extract the timing signal and a chromatic dispersion control apparatus to add dispersion compensation. The optical signal may be modulated by a data signal having a bit rate of X bits/second and the extracted timing signal may have a frequency of X hertz. The signal extraction circuit may be used with a phase locked loop. Here, a voltage-controlled oscillator generates a clock signal, a phase comparison circuit compares the phase of the clock signal with the phase of the extracted timing signal and a control circuit controls the phase comparison circuit, to generate a control voltage for the voltage-controlled oscillator on the basis of the comparison. The chromatic dispersion control apparatus may use a variable dispersion compensator together with an optical detector which detects the intensity of a specific frequency component of the optical signal to minimize the intensity of the specific frequency component.
    • 一种用于提取定时信号的方法从光信号的第一部分产生数据信号,从光信号的第二部分提取定时信号,并将色散补偿添加到光信号的第一和第二部分中的至少一个 从而控制光信号的第二部分中的总色散量与光信号的第一部分中的总色散量基本上不同。 定时信号提取装置使用信号再现电路产生数据信号,提取定时信号的信号提取电路和色散控制装置以增加色散补偿。 光信号可以由具有X比特/秒的比特率的数据信号来调制,并且所提取的定时信号可以具有X赫兹的频率。 信号提取电路可以与锁相环一起使用。 这里,压控振荡器产生时钟信号,相位比较电路将时钟信号的相位与所提取的定时信号的相位进行比较,并且控制电路控制相位比较电路,以产生用于电压 - 在控制振荡器的基础上进行比较。 色散控制装置可以与检测光信号的特定频率分量的强度的光学检测器一起使用可变色散补偿器,以使特定频率分量的强度最小化。
    • 18. 发明申请
    • PACKET COMMUNICATIONS SYSTEM AND TRANSFER DEVICE
    • 分组通信系统和传输设备
    • US20070291754A1
    • 2007-12-20
    • US11842697
    • 2007-08-21
    • Takatoshi OKAGAWATakeshi IharaMasami Yabusaki
    • Takatoshi OKAGAWATakeshi IharaMasami Yabusaki
    • H04L12/56
    • H04L45/00H04L45/60
    • A packet communications system and a transfer device which allow a network control function to be changed at low cost flexibly. The network manager includes an instructor for transmitting instruction information to the plurality of transfer devices, the instruction information indicating a packet ID (terminal ID) and a control function (function ID) executed on the packet. The transfer device includes an executer for executing a predetermined control function on the packet, a first memory for storing the packet ID associated with the executer of the control function executed on the packet, a manager for updating the first memory in accordance with the instruction information received from the network manager, and an internal transfer for transferring the received packet to the executer associated with the packet in the first memory.
    • 分组通信系统和传输设备,其允许以低成本灵活地改变网络控制功能。 网络管理器包括用于向多个传送设备发送指示信息的指导者,指示在该分组上执行的分组ID(终端ID)和控制功能(功能ID)的指示信息。 传送装置包括用于执行分组上的预定控制功能的执行器,用于存储与分组上执行的控制功能的执行器相关联的分组ID的第一存储器,根据指令信息更新第一存储器的管理器 从所述网络管理器接收到的内部传送,以及用于将接收的分组传送到与所述第一存储器中的分组相关联的执行器的内部传送。