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1.发明授权
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
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。
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2.发明授权
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
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。
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公开(公告)号：US6055044A
公开(公告)日：2000-04-25
申请号：US106298
申请日：1998-06-29
申请人： Haruyoshi Uchiyama , Zhixien Lee
发明人： Haruyoshi Uchiyama , Zhixien Lee
CPC分类号： G01M11/3172
摘要： There is provided an apparatus for measuring the characteristics of an optical fiber in which a frequency difference between first and second coherent light respectively generated by first and second light sources can be accurately set and wherein preferable coherent detection can be carried out in accordance with frequency components of returned light. First coherent light at a frequency f1 is converted into a pulse light which is output to the optical fiber to be measured. The characteristics of the optical fiber are measured by multiplexing returned light from the optical fiber to be measured and second coherent light at a frequency f2 and by detecting the multiplexed light. A component .vertline.f1-f2.vertline. is detected from an optical signal obtained by the multiplexed light and is mixed with a signal at a frequency fr to decrease the frequency. An electric signal at a voltage level corresponding to a differential frequency .vertline.f1-f2.vertline.-fr included in the mixed signal is generated, and a predetermined voltage level is generated which corresponds to a set value for an optical frequency difference between the first and second coherent light. The second light source is driven based on the difference between the two voltage levels to correct the frequency of the second coherent light.
摘要翻译： 提供了一种用于测量光纤的特性的装置，其中可以精确地设置分别由第一和第二光源产生的第一和第二相干光之间的频率差，并且可以根据频率分量进行优选的相干检测 的返回光。 频率为f1的第一相干光被转换为输出到要测量的光纤的脉冲光。 光纤的特性通过将来自被测光纤的返回光和频率f2的第二相干光复用，并通过检测多路复用光来测量。 分量| f1-f2 | 从由复用光获得的光信号中检测出，并以频率fr与信号混合以降低频率。 产生与包含在混合信号中的差分频率| f1-f2 | -fr相对应的电压电平的电信号，并且产生与第一和第二信号之间的光频差的设定值相对应的预定电压电平 相干光。 基于两个电压电平之间的差来驱动第二光源，以校正第二相干光的频率。
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4.发明授权公开(公告)号：US09255861B2
公开(公告)日：2016-02-09
申请号：US12947351
申请日：2010-11-16
申请人： Haruyoshi Uchiyama , Yousuke Harima
发明人： Haruyoshi Uchiyama , Yousuke Harima
CPC分类号： G01M11/335 , G01M11/337
摘要： The invention is to provide an optical loss measuring method and an optical loss measuring apparatus capable of efficiently measuring an optical loss occurring to a target for measurement. The other optical loss measurement method comprising the steps of inputting light outputted from a light source to a target for measurement to thereby measure an output level of the target for measurement with the use of an optical power meter, maintaining the output level of the light source at a predetermined fixed value, and finding the optical loss occurring to the target for measurement on the basis of the output level of the light source maintained at the fixed value for use as the reference value.
摘要翻译： 本发明提供一种光损耗测量方法和光损耗测量装置，其能够有效地测量测量目标产生的光学损耗。 另一种光损耗测量方法包括以下步骤：将从光源输出的光输入到测量目标，从而使用光功率计测量测量目标的输出电平，保持光源的输出电平 以预定的固定值，基于保持在固定值的光源的输出电平作为基准值，求出发生在测量目标上的光损耗。
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公开(公告)号：US06700655B2
公开(公告)日：2004-03-02
申请号：US10132653
申请日：2002-04-24
IPC分类号： G01N2100
CPC分类号： G01M11/319
摘要： Optical fiber characteristic measuring device comprising a coherent light supply device, a light pulse generating device, a wave mixing device, a opto-electrical converting device, and a processing device, is provided such that parts have the frequency characteristic for corresponding to low frequency component for an opto-electrical converting device and a processing section so as to reduce the cost of the circuits.
摘要翻译： 提供包括相干光供给装置，光脉冲发生装置，波混合装置，光电转换装置和处理装置的光纤特性测量装置，使得部件具有对应于低频分量的频率特性 用于光电转换装置和处理部分，以便降低电路的成本。
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公开(公告)号：US06335788B1
公开(公告)日：2002-01-01
申请号：US09547063
申请日：2000-04-11
IPC分类号： G01N2100
CPC分类号： G01M11/3172
摘要： The present invention relates to an optical-fiber characteristics measuring apparatus that does not require frequency conversion of pulse light which enters an optical fiber to be measured, and does not restrict the cycle period of the pulse light, thereby ensuring fast measuring of the characteristics of the optical fiber. This apparatus comprises an optical directional coupler, an optical pulse generator, a balanced-light reception circuit, a signal generation section and a mixer. The optical directional coupler branches coherent light into first and second coherent lights. The optical pulse generator converts the first coherent light into pulse light which in turn enters an optical fiber to be measured. Returned light whose frequency is shifted from that of the first coherent light by a predetermined frequency through reflection and scattering in the optical fiber to be measured enters the balanced-light reception circuit. The balanced-light reception circuit carries out balanced-light reception of the second coherent light and the returned light and converts the resultant light into an electric signal. The signal generation section generates an RF signal whose frequency is equal to the predetermined frequency. The mixer mixes the electric signal and the RF signal to thereby detect the shifted frequency.
摘要翻译： 本发明涉及一种光纤特性测量装置，其不需要进入待测光纤的脉冲光的频率转换，并且不限制脉冲光的周期，从而确保快速测量 光纤。 该装置包括光学定向耦合器，光脉冲发生器，平衡光接收电路，信号产生部分和混频器。 光学定向耦合器将相干光分为第一和第二相干光。 光脉冲发生器将第一相干光转换成脉冲光，脉冲光又进入要测量的光纤。 频率从第一相干光的频率偏移预定频率的返回光通过被测光纤中的反射和散射进入平衡光接收电路。 平衡光接收电路对第二相干光和返回光进行平衡光接收，并将所得到的光转换成电信号。 信号生成部生成频率等于规定频率的RF信号。 混频器混合电信号和RF信号，从而检测移位的频率。
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公开(公告)号：US5438578A
公开(公告)日：1995-08-01
申请号：US265724
申请日：1994-06-24
IPC分类号： H04B10/293 , G02F2/02 , H01S5/0687 , H04B10/07 , H04B10/516 , H04B10/564 , H04B10/572 , H01S3/13
CPC分类号： H04B10/572 , H04B10/506
摘要： A light frequency shifter repeatedly generates, at predetermined cycles, an optical signal, an optical frequency component of which varies in a stepped manner at fixed intervals, and timing generating circuit generates timing signals corresponding to this variation. Detecting mechanisms synchronize, with the timing signal, a frequency difference between a reference light frequency freely selected from the light frequency component and a feedback light frequency of feedback light fed back so as to conform to this reference light frequency, and detect this. Light frequency-regulated light source extracts an output optical signal circulating within a closed loop circuit controlling the light frequency in accordance with the frequency difference described above, and supplies this to a light output terminal, and feeds back a portion of the output optical signal to the detecting mechanism as the feedback light described above.
摘要翻译： 光移相器在预定的周期重复地以固定的间隔以阶梯式的方式变化光频率分量的光信号，并且定时产生电路产生对应于该变化的定时信号。 检测机构与定时信号同步从光频率成分自由选择的参考光频与反馈光的反馈光频率之间的频率差，以符合该参考光频率，并进行检测。 光频调节光源根据上述频率差提取在控制光频率的闭环电路内循环的输出光信号，并将其提供给光输出端，并将输出光信号的一部分反馈到 作为上述反馈光的检测机构。
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8.发明授权公开(公告)号：US06366348B1
公开(公告)日：2002-04-02
申请号：US09551448
申请日：2000-04-18
IPC分类号： G01N2188
CPC分类号： G01M11/319
摘要： The present invention provides an optical fiber distortion measuring apparatus and optical fiber distortion measuring method which make it possible to measure the amount of distortion of an optical fiber efficiently and in a short period of time. The time change waveform when a light pulse having a frequency of &ngr;1 is applied is compared with initial data (the time change waveform obtained in a case in which there is no distortion). Then, the light intensity L1 at a position Dx at which the light intensities do not agree is obtained. Next, the time change waveform is measured when a light pulse having a frequency of &ngr;2 is applied, and the light intensity L2 at position Dx is obtained. After this, the loss (resulting from distortion) in light intensities L1 and L2 is corrected, and light intensities LC1 and LC2 are obtained. Curve calculating unit 17 obtains a second-order curve which is a curve resulting from the parallel movement of a curve approximating the spectrum waveform of the initial data, and which contains the (&ngr;1, LC1) and (&ngr;2, LC2) described above. The peak frequency detecting unit 12 obtains the light frequency exhibiting a maximum value in the light intensity in the second-order curve. The distortion amount calculating unit 13 calculates the amount of distortion based on this light frequency.
摘要翻译： 本发明提供一种光纤失真测量装置和光纤失真测量方法，其可以在短时间内有效地测量光纤的失真量。 将施加了频率为ngr的光脉冲的时间变化波形与初始数据（在没有失真的情况下获得的时间变化波形）进行比较。 然后，获得光强度不一致的位置Dx处的光强度L1。 接下来，当施加具有频率为＆ngr.2的光脉冲时测量时变波形，并且获得位置Dx处的光强度L2。 之后，校正亮度L1和L2中的损失（由失真引起的），并且获得光强度LC1和LC2。 曲线计算单元17获得二阶曲线，其是由与初始数据的频谱波形近似的曲线并行运动产生的曲线，并且包含（＆ngr; 1，LC1）和（＆ngr; 2，LC2） 如上所述。 峰值频率检测单元12获得在二阶曲线中呈现出光强度的最大值的光频率。 失真量计算单元13基于该光频率来计算失真量。
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公开(公告)号：US5949533A
公开(公告)日：1999-09-07
申请号：US102316
申请日：1998-06-22
申请人： Zhixien Lee , Haruyoshi Uchiyama
发明人： Zhixien Lee , Haruyoshi Uchiyama
CPC分类号： G01D5/35303
摘要： An optical fiber distortion measurement system (i.e., device and method) measures an optical fiber, which is constructed by alternately connecting two kinds of optical fibers whose Brillouin frequency shifts are different from each other. The system sequentially supplies optical pulses to the measured optical fiber while changing their light frequencies, so that Brillouin backscattering beams are output from the measured optical fiber. At first, the system supplies an optical pulse having a prescribed light frequency to the measured optical fiber of a non-distortion state, so that the device produces initial data representing time-related variations of light intensity of Brillouin backscattering light output from the measured optical fiber. Then, the system measures a time-related variation waveform representing light intensity of Brillouin backscattering light, which is output from the measured optical fiber supplied with the optical pulse of the prescribed light frequency. By comparing the measured time-related variation waveform with the initial data, the system determines occurrence of distortion in the measured optical fiber. Thereafter, the system discriminates a kind of the distortion, which corresponds to expansion or contraction, on the basis of a relationship between Brillouin frequency shifts, which are respectively calculated with respect to a detection point and its adjacent point on the measured time-related variation waveform. The Brillouin frequency shift is calculated in accordance with a quadratic approximation formula, which is created on the basis of the initial data.
摘要翻译： 光纤失真测量系统（即，装置和方法）测量通过交替连接布里渊频移彼此不同的两种光纤构成的光纤。 系统在改变其光频率的同时向所测量的光纤顺序地提供光脉冲，从而从所测量的光纤输出布里渊后向散射光束。 首先，系统向所测量的光纤提供具有规定的光频率的光脉冲为非失真状态，使得该器件产生表示从所测量的光学器件输出的布里渊后向散射光的光强度的时间相关变化的初始数据 纤维。 然后，系统测量表示由提供有规定光频的光脉冲的测量光纤输出的布里渊后向散射光的光强度的时间相关变化波形。 通过将测量的时间相关变化波形与初始数据进行比较，系统确定测量的光纤中的失真的发生。 此后，系统基于布里渊频移与测量时间相关变化相对于检测点和其相邻点计算的布里渊频移之间的关系来区分对应于扩张或收缩的失真的种类 波形 根据基于初始数据创建的二次近似公式计算布里渊频移。
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公开(公告)号：US5777727A
公开(公告)日：1998-07-07
申请号：US864446
申请日：1997-05-28
申请人： Yasushi Sato , Haruyoshi Uchiyama
发明人： Yasushi Sato , Haruyoshi Uchiyama
CPC分类号： G01J11/00
摘要： An OTDR measurement device employs optical heterodyne wave detection to perform measurement on optical fibers. Optical pulses are incident on a measuring optical fiber, which in turn outputs backward scattering light. The device performs heterodyne wave detection on the backward scattering light as well as probe light whose frequency is set in proximity to a frequency of the backward scattering light, thus producing a detection voltage. The device provides a differential amplifier which performs amplification on a difference between the detection voltage and a reference voltage to produce a difference signal. An A/D converter converts the difference signal to a digital signal. Square addition is performed on the digital signal to produce a mean square signal representing property of the measuring optical fiber. Herein, calculations are performed on the mean square signal to produce a reference signal, which is then converted to the reference voltage. Herein, the reference signal is produced based on a reference value which is determined in advance such that the difference signal corresponds to an intermediate value of a voltage conversion range of the A/D converter under a state where only the probe light is incident on the device. Moreover, the reference signal is automatically changed to correct a shift of the reference voltage due to disturbance factors such as variations of temperature.
摘要翻译： OTDR测量装置采用光外差波检测来对光纤进行测量。 光脉冲入射到测量光纤上，测量光纤又输出反向散射光。 该装置对后向散射光进行外差波检测以及将频率设定在靠近反向散射光的频率的探测光，从而产生检测电压。 该器件提供了一种差分放大器，其对检测电压和参考电压之间的差进行放大以产生差分信号。 A / D转换器将差分信号转换成数字信号。 对数字信号进行平方加法，以产生表示测量光纤特性的均方根信号。 这里，对均方根信号进行计算以产生参考信号，然后将其转换为参考电压。 这里，参考信号是基于预先确定的参考值产生的，使得差分信号对应于在只有探测光入射到其上的A / D转换器的电压转换范围的中间值 设备。 此外，参考信号被自动改变以校正由于诸如温度变化的干扰因素引起的参考电压的偏移。
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