公开(公告)号：US20100128257A1

公开(公告)日：2010-05-27

申请号：US12530088

申请日：2008-02-12

申请人： Yoshinori Yamamoto ,  Eisuke Sasaoka

发明人： Yoshinori Yamamoto ,  Eisuke Sasaoka

IPC分类号： G01N21/84 ,  G01J4/00 ,  G01N21/21 ,  B65H35/00

CPC分类号： G01M11/336 ,  C03B37/02745 ,  G01M11/319 ,  G01M11/39

摘要： The present invention relates to a measuring method, etc., comprising a structure for accurately measuring optical characteristics such as PMD of an optical fiber. The measuring method is a technique for measuring polarization characteristic distributions along the longitudinal direction of the optical fiber as a measuring object by using BOCDA, and by propagating probe light and pumping light opposite in the optical fiber, BGS is generated at a plurality of respective measurement positions. Then, based on Brillouin gain fluctuations at the respective measurement positions, polarization characteristic distributions are calculated.

摘要翻译： 本发明涉及一种测量方法等，其包括用于精确测量诸如光纤的PMD的光学特性的结构。 该测量方法是通过使用BOCDA来测量作为测量对象的光纤的纵向的偏振特性分布的技术，并且通过传播探针光并在光纤中相反的泵浦光，在多个相应的测量中产生BGS 职位 然后，基于各测量位置处的布里渊增益波动，计算偏振特性分布。

公开(公告)号：US20100054298A1

公开(公告)日：2010-03-04

申请号：US12438637

申请日：2007-08-21

申请人： Eisuke Sasaoka ,  Yoshinori Yamamoto

发明人： Eisuke Sasaoka ,  Yoshinori Yamamoto

IPC分类号： G01K15/00 ,  G01K3/00 ,  G01K11/32

CPC分类号： G01K11/32

摘要： The present invention relates to an optical fiber temperature sensor capable of reducing an error in a temperature measurement. The sensor comprises an optical fiber, an optical frequency difference adjusting section, a light source system, a spectrum measuring section, a temperature calculating section, and a correcting section. The light source system outputs, into different ends of the optical fiber, probe light and pumping light of which each center frequency is set corresponding to an instruction from the optical frequency difference indicating section respectively. The temperature calculating section calculates a temperature of an object based on BGS in a first domain measured by the spectrum measuring section. On the other hand, the correcting section outputs a correction instruction to the light source system so that BGS center frequency of a second domain may be in agreement with a reference value thereof.

摘要翻译： 本发明涉及能够降低温度测量误差的光纤温度传感器。 传感器包括光纤，光频差调节部，光源系统，光谱测量部，温度计算部和校正部。 光源系统分别输出到光纤的不同端，分别对应于来自光频差指示部的指示的探针光和设定了各中心频率的泵浦光。 温度计算部基于由光谱测量部测量的第一域中的BGS计算物体的温度。 另一方面，校正部分向光源系统输出校正指令，使得第二域的BGS中心频率可以与其参考值一致。

公开(公告)号：US20100027581A1

公开(公告)日：2010-02-04

申请号：US12521100

申请日：2007-12-19

申请人： Eisuke Sasaoka

发明人： Eisuke Sasaoka

IPC分类号： G01K3/00 ,  G02B6/00

CPC分类号： G01K13/02 ,  G01D5/35364 ,  G01K11/32 ,  G01K2011/322

摘要： The present invention relates to a measuring method and a controlling method of measuring the physical quantity such as a fluid temperature distribution and the like by using an optical fiber sensing technique of BOCDA system. In the measuring method, an optical fiber that functions as a BOCDA-type optical fiber sensor is disposed along a flow direction of a fluid that flows though a pipe line and in the pipe line. Since the optical fiber directly contacts with the fluid that flows though the pipe line, it is possible to rapidly measure the fluid temperature distribution. Also, based on this measurement result, the controlling method adjusts each temperature of one or more heating/cooling means provided along the longitudinal direction of a pipe line, thereby controlling at high accuracy the fluid temperature distribution in the pipe line.

摘要翻译： 本发明涉及使用BOCDA系统的光纤传感技术来测量液体温度分布等物理量的测量方法和控制方法。 在测量方法中，用作BOCDA型光纤传感器的光纤沿着流过管线和管线的流体的流动方向布置。 由于光纤直接与通过管线流动的流体接触，因此可以快速测量流体温度分布。 此外，基于该测定结果，控制方法调整沿着管线的长度方向设置的一个以上的加热/冷却装置的每个温度，从而高精度地控制管路中的流体温度分布。

公开(公告)号：US07543982B2

公开(公告)日：2009-06-09

申请号：US11665823

申请日：2006-09-29

申请人： Yoshinori Yamamoto ,  Itaru Sakabe ,  Eisuke Sasaoka ,  Hisashi Tanji

发明人： Yoshinori Yamamoto ,  Itaru Sakabe ,  Eisuke Sasaoka ,  Hisashi Tanji

IPC分类号： G01K3/00

CPC分类号： G01L1/243 ,  G01B11/18 ,  G01D5/35348 ,  G01K11/32 ,  G01M11/083

摘要： The present invention relates to a sensor or the like having a structure that enables accurate temperature measurement in a wide temperature range including a low-temperature region and is suitable for independently and accurately determining temperature variations and strains appearing in an object to be measured. The sensor comprises a laser light source, a sensor section that has a plurality of waveguides transmitting a laser light from the laser light source therethrough, a detecting section, and an analyzing section. The detecting section detects a plurality of Brillouin spectra obtained from the sensor section. The analyzing section determines at least one measurement value of a temperature in the sensor section and a strain generated in the sensor section, based on fluctuations of parameters defining the respective detected Brillouin spectra. In particular, the sensor section has a structure such that the variation of the Brillouin spectrum in response to a disturbance differs between the waveguides. Thus, by simultaneously monitoring the Brillouin spectra that varying a different manner in a plurality of waveguides, it is possible not only to measure accurately the temperature in a wide temperature range including a low-temperature region, but also to make distinction between the strain and temperature.

摘要翻译： 本发明涉及具有能够在包括低温区域的宽温度范围内进行精确的温度测量的结构的传感器等，并且适用于独立且精确地确定出现在被测量物体中的温度变化和应变。 传感器包括激光光源，传感器部分，其具有透射来自激光光源的激光的多个波导，检测部和分析部。 检测部分检测从传感器部分获得的多个布里渊频谱。 基于定义相应检测到的布里渊光谱的参数的波动，分析部分确定传感器部分中的温度的至少一个测量值和在传感器部分中产生的应变。 特别地，传感器部分具有使得响应于干扰的布里渊频谱的变化在波导之间不同的结构。 因此，通过同时监视在多个波导中改变不同方式的布里渊光谱，不仅可以在包括低温区域的宽温度范围内精确地测量温度，而且可以区分应变和 温度。

公开(公告)号：US07197242B2

公开(公告)日：2007-03-27

申请号：US10162590

申请日：2002-06-06

申请人： Eisuke Sasaoka

发明人： Eisuke Sasaoka

IPC分类号： H04B10/00

CPC分类号： G01M11/35 ,  G01M11/333 ,  G01M11/335 ,  G01M11/338

摘要： The present invention provides a chromatic-dispersion measuring apparatus and method that can quickly measure chromatic dispersion in an optical fiber even when the optical fiber is short. Continuous light beams having the wavelengths λ1 and λ2 output from light sources are multiplexed by a multiplexer, are intensity-modulated by an intensity modulator, and are then output as optical signals. The output optical signals with the wavelengths λ1 and λ2 enter an optical fiber to be measured, and propagate therethrough. The optical signals emerging from the optical fiber are de-multiplexed by a de-multiplexer, and are received by corresponding photodetectors. Subsequently, the phase difference between the optical signals received by the photodetectors is detected by a phase detector. The chromatic dispersion of the optical fiber is calculated by an arithmetical circuitry on the basis of the detection result.

摘要翻译： 本发明提供即使在光纤短的情况下也能够快速地测量光纤中的色散的色散测量装置和方法。 从光源输出的具有波长λ1和λ2的波长的连续光束被多路复用器复用，被强度调制器强度调制，然后作为光输出 信号。 具有波长λ1和λ2的输出光信号进入要测量的光纤，并通过其传播。 从光纤出射的光信号由去多路复用器解复用，并被相应的光电探测器接收。 随后，由相位检测器检测由光电检测器接收的光信号之间的相位差。 基于检测结果，通过算术电路计算光纤的色散。

公开(公告)号：US20060188205A1

公开(公告)日：2006-08-24

申请号：US11359417

申请日：2006-02-23

申请人： Yoshinori Yamamoto ,  Eisuke Sasaoka

发明人： Yoshinori Yamamoto ,  Eisuke Sasaoka

IPC分类号： G02B6/02

CPC分类号： H04B10/2537

摘要： Provided is an optical transmission line in which the suppression of SBS and the achievement of other transmission characteristics can compatibly be attained. The optical transmission line is formed by connecting a first optical fiber and a second optical fiber, or by connecting a group of first optical fibers and a group of second optical fibers, in which the difference in Brillouin frequency shift therebetween is 200 MHz or more. In at least one of the first optical fiber and the second optical fiber, the transmission loss may be 0.32 dB/km or less at a wavelength of 1383 nm. In each of the first and second optical fibers, the mode field diameter may be not less than 8.2 μm and not more than 9.8 μm, the cable cutoff wavelength may be equal to or less than 1260 nm, and the zero dispersion wavelength may be not less than 1300 nm and not more than 1324 nm. The difference between the average Brillouin frequency shift of each optical fiber group and the Brillouin frequency shift of each optical fiber contained in the respective optical fiber group may be equal to or less than 40 MHz.

摘要翻译： 提供了能够兼容SBS的抑制和其他传输特性的实现的光传输线。 光传输线通过连接第一光纤和第二光纤，或者连接一组第一光纤和一组第二光纤，其中布里渊频率差在200MHz以上。 在第一光纤和第二光纤中的至少一个中，在1383nm的波长下的传输损耗可以为0.32dB / km以下。 在第一和第二光纤中的每一个中，模场直径可以不小于8.2μm和不大于9.8μm，电缆截止波长可以等于或小于1260nm，并且零色散波长可以不是 小于1300nm且不大于1324nm。 每个光纤组的平均布里渊频移与每个光纤组中包含的每个光纤的布里渊频移之间的差可以等于或小于40MHz。

公开(公告)号：US06853766B2

公开(公告)日：2005-02-08

申请号：US10218491

申请日：2002-08-15

申请人： Masao Tsukitani ,  Eisuke Sasaoka ,  Toshiaki Okuno ,  Shigeru Tanaka

发明人： Masao Tsukitani ,  Eisuke Sasaoka ,  Toshiaki Okuno ,  Shigeru Tanaka

IPC分类号： G02B6/255 ,  G02B6/34 ,  G02B6/26

CPC分类号： G02B6/29394 ,  G02B6/2551

摘要： The present invention relates to a dispersion-compensating module having a structure which compensates for the dispersion of an optical transmission line in a wavelength band of 1.55 μm and adjusts loss fluctuations among wavelengths in the wavelength band of 1.55 μm into an appropriate range. The module comprises a structure adapted to be installed in an already installed optical fiber transmission line, and has a loss slope with a polarity opposite to that of the optical fiber transmission line in the wavelength band of 1.55 μm. An example of the module comprises a dispersion-compensating optical fiber as a dispersion-compensating device, and an optical fiber doped with a transition metal element as a loss-equalizing device. Consequently, the loss fluctuations among individual wavelengths in the whole transmission line including the dispersion-compensating module are adjusted by the loss-equalizing device in the dispersion-compensating module so as to fall within an appropriate range.

摘要翻译： 本发明涉及一种具有补偿光传输线在1.55μm波段的色散的结构的色散补偿模块，并且将波长为1.55μm的波长之间的损耗波动调整到适当的范围内。 该模块包括适于安装在已经安装的光纤传输线中的结构，并且具有与1.55μm波长带中的光纤传输线的极性相反的损耗斜率。 该模块的一个例子包括作为色散补偿装置的色散补偿光纤，以及掺杂过渡金属元素作为损耗均衡装置的光纤。 因此，通过色散补偿模块中的损耗均衡装置来调整包括色散补偿模块在内的整个传输线中的各个波长之间的损耗波动，使其落入适当的范围内。

公开(公告)号：US06766088B2

公开(公告)日：2004-07-20

申请号：US09810414

申请日：2001-03-19

申请人： Takemi Hasegawa ,  Masashi Onishi ,  Eisuke Sasaoka ,  Masayuki Nishimura

发明人： Takemi Hasegawa ,  Masashi Onishi ,  Eisuke Sasaoka ,  Masayuki Nishimura

IPC分类号： G02B602

CPC分类号： G02B6/03627 ,  B82Y20/00 ,  C03B37/01231 ,  C03B37/0253 ,  C03B37/027 ,  C03B37/02727 ,  C03B37/02763 ,  C03B37/02781 ,  C03B2203/14 ,  C03B2203/18 ,  C03B2203/36 ,  C03B2203/42 ,  C03B2205/08 ,  C03B2205/10 ,  C03B2205/20 ,  C03B2205/40 ,  C03B2205/72 ,  C03C25/6206 ,  G02B6/02033 ,  G02B6/02228 ,  G02B6/02247 ,  G02B6/02276 ,  G02B6/02366 ,  G02B6/02376 ,  G02B6/032 ,  G02B6/1225

摘要： An optical fiber has a section of the first kind having a chromatic dispersion not less than a given positive value x and a negative chromatic dispersion slope at a given wavelength and a section of the second kind has a chromatic dispersion not more than −x and a positive chromatic dispersion slope at the same wavelength. Another optical fiber has a chromatic dispersion higher than a positive value x and a negative chromatic dispersion slope at a given wavelength band.

摘要翻译： 光纤具有第一种具有不小于给定正值x的色散和在给定波长处的负色散斜率的部分，并且第二类的部分具有不大于-x的色散和 相同波长的正色散斜率。 另一光纤具有高于正值x的色散和在给定波长带处的负色散斜率。

公开(公告)号：US06666591B2

公开(公告)日：2003-12-23

申请号：US09939662

申请日：2001-08-28

申请人： Eisuke Sasaoka ,  Motonori Nakamura ,  Osamu Kasuu

发明人： Eisuke Sasaoka ,  Motonori Nakamura ,  Osamu Kasuu

IPC分类号： G02B6255

CPC分类号： G02B6/2551 ,  G02B6/2552 ,  G02B6/262

摘要： Methods for connecting two optical fibers having different mode field diameters ((MFD) with low connection loss is proposed. One method comprises steps of preparing the third fiber (Fiber 3), a short length and MFD being smaller than that of the first fiber (Fiber 1) and larger than that of the second (Fiber 2), connecting the Fiber 1 to 3, connecting Fiber 2 to 3, and increasing MFD of Fiber 3 near the part connected or to be connected to Fiber 1, or MFD of Fiber 2 near the part connected or to be connected to Fiber 3 by heating the corresponding part. The other method comprises steps of preparing a short length Fiber 3 having smaller MFD than that of Fiber 1, increasing MFD of Fiber 3 near the part to be connected to Fiber 1 by heating the corresponding part, and then connecting Fiber 1 to 3, and 3 to 2 in that order.

公开(公告)号：US06636677B2

公开(公告)日：2003-10-21

申请号：US09793415

申请日：2001-02-27

申请人： Takemi Hasegawa ,  Eisuke Sasaoka ,  Masayuki Nishimura ,  Masashi Onishi

发明人： Takemi Hasegawa ,  Eisuke Sasaoka ,  Masayuki Nishimura ,  Masashi Onishi

IPC分类号： G02B602

CPC分类号： G02B6/02333 ,  C03B37/01231 ,  C03B37/0253 ,  C03B37/027 ,  C03B37/02727 ,  C03B37/02763 ,  C03B37/02781 ,  C03B2203/14 ,  C03B2203/18 ,  C03B2203/36 ,  C03B2203/42 ,  C03B2205/08 ,  C03B2205/10 ,  C03B2205/20 ,  C03C25/6206 ,  G02B6/02033 ,  G02B6/02228 ,  G02B6/02247 ,  G02B6/02276 ,  G02B6/02347 ,  G02B6/02357 ,  G02B6/02361 ,  G02B6/02376 ,  G02B6/03627

摘要： In an optical fiber composed of a core region and a cladding region surrounding the core region and having a plurality of regions made of sub mediums having refractive indices different from a refractive index of a main medium disposed in a main medium constituting this cladding region, these regions made of the sub mediums are arranged in one given or a plurality of a given circular annular regions and the centers of the regions made of the sub mediums in respective circular annular regions are arranged on the same circumference centered at the center of the core.

摘要翻译： 在由芯区域和围绕芯区域的包层区域构成的光纤中，具有由构成该包层区域的主介质的折射率不同于设置在构成该包层区域的主介质的折射率的副介质的多个区域构成的光纤， 由副介质制成的区域布置在给定的一个或多个给定的圆形环形区域中，并且由各个圆形环形区域中的副介质制成的区域的中心布置在以芯的中心为中心的同一圆周上。