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    • 1. 发明专利
    • Optical modulation device and method for switching optical modulation format
    • 光学调制装置和用于切换光学调制格式的方法
    • JP2008249848A
    • 2008-10-16
    • JP2007088622
    • 2007-03-29
    • Fujitsu Ltd富士通株式会社
    • TANAKA TOSHIKIMIYATA HIDEYUKIAKIYAMA YUICHIHOSHIDA GOJI
    • G02F1/03H04B10/07H04B10/516H04B10/524H04B10/54H04B10/556H04B10/588H04B10/61
    • G02F1/2255G02F1/0123H04B10/505H04B10/5162H04B10/5167H04B10/5561
    • PROBLEM TO BE SOLVED: To flexibly switch a modulation format without requiring a plurality of modulators corresponding to respective modulation formats. SOLUTION: The optical modulation device 100 can switch a modulation format according to a modulation switching information. A Mach-Zehnder type modulator 120 modulates carrier light on the basis of a drive signal. An oscillator 140 superimposes a signal of a prescribed frequency on the drive signal. A bias supply part 162 supplies bias voltage corresponding to a component of the prescribed frequency included in signal light modulated by the Mach-Zehnder type modulator 120 to the Mach-Zehnder type modulator 120. A switch 170 switches: a first route 171 for superimposing the signal of the prescribed frequency to the drive signal; and a second route 172 for superimposing the signal of the prescribed frequency to the bias voltage. A modulation switching part 180 controls the drive signal and the switch 170 according to the modulation switching information. COPYRIGHT: (C)2009,JPO&INPIT
    • 要解决的问题:灵活地切换调制格式,而不需要与各种调制格式对应的多个调制器。 光调制装置100可以根据调制切换信息切换调制格式。 马赫 - 曾德尔型调制器120基于驱动信号调制载波。 振荡器140将规定频率的信号叠加在驱动信号上。 偏置供给部分162将与由Mach-Zehnder型调制器120调制的信号光中包括的规定频率的分量相对应的偏置电压提供给马赫 - 曾德尔型调制器120.开关170切换:第一路线171,用于将 指定频率的信号到驱动信号; 以及用于将规定频率的信号叠加到偏置电压的第二路线172。 调制切换部180根据调制切换信息来控制驱动信号和开关170。 版权所有(C)2009,JPO&INPIT
    • 2. 发明专利
    • Optical modulation device, optical transmitter, and optical transmission system
    • 光学调制装置,光学发射器和光传输系统
    • JP2008141671A
    • 2008-06-19
    • JP2006328449
    • 2006-12-05
    • Fujitsu Ltd富士通株式会社
    • WATANABE MANABUOTSUKA TOMOYUKI
    • G02F1/01H04B10/07H04B10/516H04B10/61
    • G02F1/0123H04B10/5167H04B10/541
    • PROBLEM TO BE SOLVED: To provide an optical modulation device employing a duobinary modulation technique that has a function of varying an optical output power, resulting in a reduction in cost and size.
      SOLUTION: A monitoring means 25 is used to detect the power of an optical signal output from an optical modulation means 24. An amplitude control means 28 compares the power of the optical signal with an optical power target value that is a target value of the power of the optical signal using a comparison means 29. Based on the results of the comparison, the amplitude control means 28 controls the amplitude of a drive voltage output from an optical modulation drive means 27 so that the power of the optical signal output from the optical modulation means 24 matches the optical power target value. The optical modulation means 24 is driven by the drive voltage whose amplitude has been controlled.
      COPYRIGHT: (C)2008,JPO&INPIT
    • 要解决的问题:提供一种使用具有改变光输出功率的功能的双二进制调制技术的光调制装置,导致成本和尺寸的降低。 解决方案:监视装置25用于检测从光调制装置24输出的光信号的功率。幅度控制装置28将光信号的功率与作为目标值的光功率目标值进行比较 使用比较装置29的光信号的功率。基于比较结果,幅度控制装置28控制从光调制驱动装置27输出的驱动电压的幅度,使得光信号输出的功率 光调制装置24与光功率目标值匹配。 光调制装置24由其幅度被控制的驱动电压驱动。 版权所有(C)2008,JPO&INPIT
    • 3. 发明专利
    • Optical transmission apparatus and optical transmission system
    • 光传输装置和光传输系统
    • JP2007259286A
    • 2007-10-04
    • JP2006083594
    • 2006-03-24
    • Fujitsu Ltd富士通株式会社
    • YAMAZAKI TORUSAKAMOTO HISAYA
    • G02F1/03H04B10/2507H04B10/2513H04B10/516H04B10/61
    • H04B10/505H04B10/25137H04B10/5167
    • PROBLEM TO BE SOLVED: To enhance characteristics neat zero distribution without damaging characteristics in high distribution in an optical duo-binary system.
      SOLUTION: An optical transmission apparatus is configured to comprise an optical modulation and transmission unit 1; a drive signal processing unit 2; and a modulation operation switching unit 3, which switches the modulation operations in the optical modulation and transmission unit 1 so that a modulation waveform strength-modulated by the optical modulation and transmission unit 1 becomes either a first modulation waveform which minimizes the intensity of modulation light, with respect to the center value of a duo-binary signal and maximizes the intensity of modulation light, with respect to other two values of the duo-binary signal, or a second modulation waveform which maximizes the intensity of modulation light, with respect to the central value of the duo-binary signal and minimizes the intensity of modulation light, with respect to the other two values of the duo-binary signal.
      COPYRIGHT: (C)2008,JPO&INPIT
    • 要解决的问题:增强光二值系统中高分布特性的零零分布特性,而不会损害特性。 光传输装置被配置为包括光调制和传输单元1; 驱动信号处理单元2; 以及调制操作切换单元3,其切换光调制和发送单元1中的调制操作,使得由光调制和发送单元1强度调制的调制波形变为使调制光的强度最小化的第一调制波形 相对于二进制二进制信号的中心值,并且相对于二进制二进制信号的其他两个值或调制光的强度最大化的第二调制波形使调制光的强度最大化,相对于 二进制二进制信号的中心值,并且相对于二进制二进制信号的其他两个值使调制光的强度最小化。 版权所有(C)2008,JPO&INPIT
    • 6. 发明专利
    • Duo-binary encoder and optical duo-binary transmission apparatus using the same
    • 二进制编码器和光二进制传输装置
    • JP2005168023A
    • 2005-06-23
    • JP2004348241
    • 2004-12-01
    • Samsung Electronics Co Ltd三星電子株式会社
    • KIM SUNG-KEELEE HAN-LIMHWANG SEONG-TEAK
    • H04J3/00G11B20/10H03M5/02H04B10/2507H04B10/2513H04B10/516H04B10/524H04B10/54H04B10/588H04B10/61H04B10/04H04B10/02H04B10/06H04B10/142H04B10/152H04B10/18
    • H03M5/02H04B10/505H04B10/5055H04B10/5167
    • PROBLEM TO BE SOLVED: To provide a duo-binary encoder and an optical duo-binary transmission apparatus in which acceleration can be performed while using an existing low-speed electrical element.
      SOLUTION: The optical duo-binary encoder includes: a level change detection unit 410 for detecting that levels of data input signals of N channels inputted at an n-th input of channels change from 0 to 1, or from 1 to 0; a determination unit 420 for judging whether the number of level changes detected by the level change detection unit is odd or even; a toggle unit 430 for toggling an output signal of the determination unit when the number of level changes is odd; an intermediate signal generation unit 440 for determining whether phases of other channels are shifted or not according to a data input signal on the basis of a predetermined channel of the N channels; and a phase division unit 450 for dividing data into a data group having non-shifted phases and another data group which requires a phase shift according to an output signal of the intermediate signal generation unit and the data input signal, and outputting the divided data groups.
      COPYRIGHT: (C)2005,JPO&NCIPI
    • 要解决的问题:提供二进制编码器和光二元传输装置,其中可以在使用现有的低速电气元件的同时进行加速。 光二元编码器包括:电平变化检测单元410,用于检测在第n个通道输入处输入的N个通道的数据输入信号的电平从0变化到1或从1变为0 ; 确定单元420,用于判断由电平变化检测单元检测到的电平变化的数量是奇数还是偶数; 切换单元430,用于在电平变化次数为奇数时切换确定单元的输出信号; 中间信号生成单元440,用于根据N个信道的预定信道,根据数据输入信号确定其他信道的相位是否移位; 以及相位分割单元450,用于根据中间信号产生单元和数据输入信号的输出信号将数据分割为具有非移相的数据组和需要相移的另一数据组,并输出分割数据组 。 版权所有(C)2005,JPO&NCIPI