利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

24 条记录 (耗时 0.037 秒)

    Method and apparatus for measuring the noise figure of an optical amplifier
    1.
    发明授权
    Method and apparatus for measuring the noise figure of an optical amplifier 失效
    用于测量光放大器噪声系数的方法和装置

    公开(公告)号：US5781322A

    公开(公告)日：1998-07-14

    申请号：US696074

    申请日：1996-08-13

    申请人： Haruyoshi Uchiyama ,  Zhixien Li ,  Kazuo Aida

    发明人： Haruyoshi Uchiyama ,  Zhixien Li ,  Kazuo Aida

    IPC分类号： G01M11/00 ,  G01J11/00 ,  H04B10/00

    CPC分类号： G01J11/00

    摘要： An optical pulse signal produced by modulating a continuous laser light by means of a first pulse having a period sufficiently shorter than the atomic lifetime in the upper energy state of a rare earth doped fiber is input to an optical amplifier to be measured, while an output signal from the optical amplifier is modulated by a second pulse synchronized with the first pulse and having a phase difference relative to the first pulse which can be optionally set so that rapid phase adjustment relative to the first pulse is possible based on the phase at the time of minimum optical power. The noise figure of the optical amplifier is then measured based on, the maximum photoelectric power (P.sub.AMP +P.sub.ASE) and the minimum photoelectric power P.sub.ASE of the resultant optical signal.

    摘要翻译： 通过在稀土掺杂光纤的上能量状态下通过具有比原子寿命充分短的时间的第一脉冲调制连续激光而产生的光脉冲信号被输入到待测量的光放大器，而输出 来自光放大器的信号由与第一脉冲同步的第二脉冲调制，并具有相对于第一脉冲的相位差，该第一脉冲可以可选地被设置为使得可以基于当时的相位相对于第一脉冲进行快速相位调整 的最小光功率。 然后，基于最终的光信号的最大光电功率（PAMP + PASE）和最小光电功率PASE来测量光放大器的噪声系数。

    Method and apparatus for determining noise factor of optical amplifier
    2.
    发明授权
    Method and apparatus for determining noise factor of optical amplifier 失效
    用于确定光放大器噪声系数的方法和装置

    公开(公告)号：US5561551A

    公开(公告)日：1996-10-01

    申请号：US542737

    申请日：1995-10-13

    申请人： Takashi Iwasaki ,  Haruyoshi Uchiyama ,  Kazuo Aida ,  Yoshiaki Sato

    发明人： Takashi Iwasaki ,  Haruyoshi Uchiyama ,  Kazuo Aida ,  Yoshiaki Sato

    IPC分类号： G01M11/00 ,  G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/10 ,  H01S3/17 ,  H04B10/02

    CPC分类号： H04B10/0731 ,  H01S3/06754 ,  H04B10/07 ,  H01S2301/02

    摘要： A simple, quick and precise method for determining a noise factor of an optical amplifier system is presented and demonstrated with an apparatus based on rare-earth doped optical fibers. The method is based on rapid adjustments of the phase differentials between the input optical signals into and the output optical signals from the optical amplifier to compensate for system variables including the optical fiber lengths within the apparatus as well as in the ancillary devices. A cw laser source is modulated with a first pulse having a significantly shorter cycle than a lifetime of excited atoms within the doped fiber, and the modulated pulses are continually applied to the noise determining apparatus. The optical output signal from the apparatus is synchronized with the first pulse and the optical output signal is further modulated with a series of second pulses having increasing phase differentials in relation to the first pulse. The electrical output power from the noise determining apparatus undergoes a maximum and a minimum values, and the noise factor of the apparatus is calculated by using the values of the respective maximum and the minimum electrical output power.

    摘要翻译： 介绍了一种用于确定光放大器系统的噪声系数的简单，快速和精确的方法，并用基于稀土掺杂光纤的设备进行了演示。 该方法基于输入光信号之间的相位差的快速调整和来自光放大器的输出光信号的补偿，以补偿包括装置内和辅助装置中的光纤长度的系统变量。 cw激光源通过第一脉冲进行调制，该第一脉冲具有比掺杂光纤内的激发原子的寿命显着更短的周期，并且调制脉冲被连续施加到噪声确定装置。 来自装置的光输出信号与第一脉冲同步，并且光输出信号通过相对于第一脉冲具有增加的相位差的一系列第二脉冲进一步调制。 来自噪声判定装置的电力输出功率经历最大值和最小值，并且通过使用相应的最大和最小电力输出功率的值来计算装置的噪声系数。

    Method and apparatus for monitoring noise figure of optical amplifier
    3.
    发明授权
    Method and apparatus for monitoring noise figure of optical amplifier 失效
    用于监测光放大器噪声系数的方法和装置

    公开(公告)号：US5471334A

    公开(公告)日：1995-11-28

    申请号：US139227

    申请日：1993-10-19

    申请人： Hiroji Masuda ,  Kazuo Aida ,  Kiyoshi Nakagawa

    发明人： Hiroji Masuda ,  Kazuo Aida ,  Kiyoshi Nakagawa

    IPC分类号： H04B10/073 ,  H04B10/077 ,  H04B10/079 ,  H04B10/291 ,  H04B17/00

    CPC分类号： H04B10/0731 ,  H04B10/077 ,  H04B10/07955 ,  H04B10/291 ,  H04B2210/003

    摘要： A method and an apparatus for monitoring the noise figure of an optical amplifier such as used in linear repeaters in an optical transmission system formed by cascaded linear repeaters. The apparatus includes at least one optical amplifier for amplifying input signal light and a narrow bandwidth optical filter for removing amplified spontaneous emission (ASE) light generated at the optical amplifier. A gain detector is provided to detect the gain of the optical amplifier and an ASE optical power detector detects an optical power of the ASE light generated at the optical amplifier. The apparatus includes a splitter for splitting light entering into the narrow bandwidth optical filter and a local oscillator for generating local light having a wavelength displaced from a wavelength of the input signal light. The light split by the splitter is coupled with the local light generated by the local oscillator. An optical power detector makes a heterodyne detection of the optical power of the coupled light. An electrical band-pass filter extracts the optical power of the ASE light generated by the optical amplifier from the optical power obtained by the optical power detector. A noise figure calculator calculates the noise figure according to the gain detected by the gain detector and the optical power of the ASE light detected by the ASE optical power detector.

    摘要翻译： 一种用于监测光放大器的噪声系数的方法和装置，例如在由级联线性转发器形成的光传输系统中用于线性中继器中。 该装置包括用于放大输入信号光的至少一个光放大器和用于去除在光放大器处产生的放大的自发发射（ASE）光的窄带宽滤光器。 提供增益检测器来检测光放大器的增益，并且ASE光功率检测器检测在光放大器处产生的ASE光的光功率。 该装置包括用于分离进入窄带宽滤光器的光的分离器和用于产生具有从输入信号光的波长偏移的波长的局部光的本地振荡器。 由分路器分开的光与由本地振荡器产生的局部光耦合。 光功率检测器对耦合光的光功率进行外差检测。 电带通滤波器从由光功率检测器获得的光功率中提取由光放大器产生的ASE光的光功率。 噪声系数计算器根据由增益检测器检测的增益和由ASE光功率检测器检测到的ASE光的光功率计算噪声系数。

    Program counter display device
    5.
    发明授权
    Program counter display device 失效
    程序计数器显示装置

    公开(公告)号：US5021948A

    公开(公告)日：1991-06-04

    申请号：US31280

    申请日：1987-03-30

    申请人： Yasuko Nakayama ,  Kazuo Aida

    发明人： Yasuko Nakayama ,  Kazuo Aida

    IPC分类号： G06F11/32 ,  G06F11/36

    CPC分类号： G06F11/3664 ,  G06F11/3636

    摘要： A program counter display device having a program memory which stores a source program. An interpreter reads out the source program from the program memory and executing it. A program list generator generates a program list of the program stored in the program memory, and a program flow monitor having knowledge of the program flow determines the program flow in accordance with the statement currently being executed. A control structure monitor correlates the current statement supplied from the interpreter with a program control structure, and checks the balance of the program control structure such as the existence of an end in a loop structure, the existence of a destination of a branch sentence, etc. A program counter-mark generator connected to the program flow monitor and the control structure monitor generates a program counter mark indicating the program counter function, the program flow, and the control sturcture. A display device connects to the program list generator and to the program counter mark generator and displays the program counter mark in association with the program list. The program counter mark is constituted by a box section which is displayed over the range of the program list included in the program control structure. A direction-indicating section is displayed within the box section, and indicates which statement is currently being executed, and also the direction of program flow. When the arrow of the direction-indicating section is pointing right, the arrow is pointing to the current statement; when the arrow is pointing upward or downward, the arrow is indicating the program flow.

    摘要翻译： 具有存储源程序的程序存储器的程序计数器显示装置。 解释器从程序存储器中读出源程序并执行它。 程序列表生成器生成存储在程序存储器中的程序的程序列表，具有程序流程知识的程序流程监视器根据当前执行的语句确定程序流程。 控制结构监视器将从解释器提供的当前语句与程序控制结构相关联，并且检查程序控制结构的平衡，例如循环结构中的结尾的存在，分支句的目的地的存在等 连接到程序流程监视器和控制结构监视器的程序计数器生成器产生指示程序计数器功能，程序流程和控制结构的程序计数器标记。 显示装置连接到程序列表发生器和程序计数器标记发生器，并与程序列表相关联地显示程序计数器标记。 程序计数器标记由在程序控制结构中包括的程序列表的范围上显示的框部分构成。 方向指示部分显示在框部分内，并指示当前正在执行的语句，以及程序流程的方向。 当方向指示部分的箭头指向右边时，箭头指向当前语句; 当箭头向上或向下指向时，箭头指示程序流。

    Optical fiber amplifier
    6.
    发明授权
    Optical fiber amplifier 失效
    光纤放大器

    公开(公告)号：US5633750A

    公开(公告)日：1997-05-27

    申请号：US641218

    申请日：1996-04-30

    申请人： Seiji Nogiwa ,  Kazuo Aida ,  Kiyoshi Nakagawa

    发明人： Seiji Nogiwa ,  Kazuo Aida ,  Kiyoshi Nakagawa

    IPC分类号： G02F1/35 ,  H01S3/06 ,  H01S3/07 ,  H01S3/13 ,  H01S3/131 ,  H01S3/16 ,  H01S3/00

    CPC分类号： H01S3/1301 ,  H01S3/06754 ,  H01S3/10015 ,  H01S3/1608

    摘要： The invention offers an optical fiber amplifier with good frequency characteristics which allows the gain to be held constant even without an input signal beam and allows gain control with respect to input optical signals with high-speed power fluctuations. An excitation beam source 8 supplies an excitation beam for light amplification and a control beam source 15 supplies a control beam for controlling the gain to an EDF 4 which amplifies a signal beam by means of optical excitation. An excitation beam monitor 9 measures the power of the excitation beam when inputted to the EDF 4 and an excitation beam monitor 12 measures the power of the excitation beam when outputted from the EDF 4. A comparator 11 calculates the ratio between the power measured by the excitation beam monitor 9 and the power measured by the excitation beam monitor 12. A drive circuit 14 controls the power of the control beam supplied by the control beam source 15 based on the results obtained by the comparator 11.

    摘要翻译： 本发明提供了具有良好频率特性的光纤放大器，其允许即使没有输入信号光束也可以将增益保持为恒定，并且允许相对于具有高速功率波动的输入光信号的增益控制。 激励光束源8提供用于光放大的激励光束，并且控制光束源15将控制光束提供给EDF 4，EDF 4通过光激励来放大信号光束。 激励光束监视器9在输入到EDF 4时测量激发光束的功率，激励光束监视器12在从EDF 4输出时测量激励光束的功率。比较器11计算由 激励光束监视器9和由激励光束监视器12测量的功率。驱动电路14基于由比较器11获得的结果来控制由控制光束源15提供的控制光束的功率。

    Noise measurement for optical amplifier and a system therefor
    7.
    发明授权
    Noise measurement for optical amplifier and a system therefor 失效
    光放大器的噪声测量及其系统

    公开(公告)号：US5521751A

    公开(公告)日：1996-05-28

    申请号：US387077

    申请日：1995-02-13

    申请人： Kazuo Aida ,  Yoshiaki Sato

    发明人： Kazuo Aida ,  Yoshiaki Sato

    IPC分类号： G01M11/00 ,  H01L21/66 ,  H01S3/00 ,  H01S3/06 ,  H01S3/067 ,  H01S3/10

    CPC分类号： H04B10/0731 ,  H01S3/06754 ,  H04B10/07 ,  H01S2301/02

    摘要： A method and a system for measuring a noise figure of an optical amplifier which independently detects two different output powers generated from the optical amplifier under measurement. The generation of the first output power is in synchronization with a space period of an input optical pulsed signal, while the generation of the second output power is in synchronization with the mark period of the input optical pulsed signal. The-optical pulsed signal is an intensity-modulated signal given at a repetition period which is sufficiently shorter than the life time of carriers or the life time of ions in a metastable level of the optical amplifier under measurement.

    摘要翻译： 一种用于测量光放大器的噪声系数的方法和系统，其独立地检测从测量的光放大器产生的两种不同的输出功率。 第一输出功率的产生与输入光脉冲信号的空间周期同步，而第二输出功率的产生与输入的光脉冲信号的标记周期同步。 光脉冲信号是在重复周期给出的强度调制信号，该重复周期足够短于载波的寿命或测量中的光放大器的亚稳态中的离子的寿命。

    Photoperiodic circuit amplification control apparatus
    8.
    发明授权
    Photoperiodic circuit amplification control apparatus 失效
    光周期电路放大控制装置

    公开(公告)号：US5495362A

    公开(公告)日：1996-02-27

    申请号：US417675

    申请日：1995-04-06

    申请人： Tatuhiko Takatu ,  Kazuo Aida ,  Kiyoshi Nakagawa

    发明人： Tatuhiko Takatu ,  Kazuo Aida ,  Kiyoshi Nakagawa

    IPC分类号： H01S3/067 ,  H01S3/094 ,  H01S3/13 ,  H01S3/131 ,  H01S3/00

    CPC分类号： H01S3/06754 ,  H01S3/1301 ,  H01S3/06791 ,  H01S3/094003

    摘要： The object of the present invention is to control the amplification rate of a photoperiodic circuit by stable negative feedback control, thereby suppressing fluctuations in the circulating light in the photoperiodic circuit. The circulating light in the photoperiodic circuit is converted into an electrical signal, indicating the intensity of the circulating light, which is held in a first sample-and-hold circuit. Additionally, an electrical signal indicating the intensity of circulating light of the circuit previous to that of the first sample-and-hold circuit is held in a second sample-and-hold circuit. The difference in the value between the electrical signals which indicate intensities of the circulating light are determined by a subtraction circuit. The result is supplied to an addition circuit through a third sample-and-hold circuit. The addition circuit adds the output of the third sample-and-hold circuit with the output of a standard electrical power source, and the result is supplied to an excitation light source. The excitation light source supplies excitation light, having an intensity dependent upon the above-mentioned addition result, to a rare-earth-doped fiber.

    摘要翻译： 本发明的目的是通过稳定的负反馈控制来控制光周期性电路的放大率，从而抑制光周期性电路中的循环光的波动。 光周期性电路中的循环光转换为电信号，表示保持在第一采样保持电路中的循环光的强度。 另外，表示第一采样保持电路之前的电路的循环光强度的电信号被保持在第二采样保持电路中。 指示循环光强度的电信号之间的差值由减法电路确定。 结果通过第三采样保持电路提供给加法电路。 加法电路将第三采样保持电路的输出与标准电源的输出相加，并将结果提供给激励光源。 激发光源将具有取决于上述添加结果的强度的激发光提供给稀土掺杂光纤。