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1. 发明授权

US5206925A Rare earth element-doped optical waveguide and process for producing the same 失效
标题翻译：稀土元素光学波导及其制造方法
公开(公告)号：US5206925A
公开(公告)日：1993-04-27
申请号：US692336
申请日：1991-04-26
申请人： Masataka Nakazawa , Yasuo Kimura , Katsuyuki Imoto , Seiichi Kashimura , Toshikazu Kamoshida , Fujio Kikuchi
发明人： Masataka Nakazawa , Yasuo Kimura , Katsuyuki Imoto , Seiichi Kashimura , Toshikazu Kamoshida , Fujio Kikuchi
IPC分类号： G02B6/12 , C03C13/04 , G02B6/13 , G02F1/35 , H01S3/06 , H01S3/063
CPC分类号： C03C13/045 , H01S3/063
摘要： A core waveguide having a substantially rectangular cross section, with the width thereof greater than the thickness thereof, is provided in a cladding formed on a substrate, and a rare earth element-doped layer is provided in the core waveguide along the waveguiding direction of the waveguide. With the width of the core waveguide set greater than the thickness of the core waveguide, good optical confinement in the width direction of the waveguide is obtained, which enables light to be absorbed by the rare earth element-doped layer efficiently and concentratedly. It is thereby possible to achieve a marked improvement in the excitation efficiency of excitation power. Thus, an enhanced excitation efficiency is achieved with less addition of a rare earth element, and a high-gain optical amplification waveguide free of concentration extinction is provided.
摘要翻译：在基板上形成的包层中设置具有大致矩形横截面的芯波导，其宽度大于其厚度，并且在芯波导中沿着波导方向设置稀土元素掺杂层波导。由于芯波导的宽度大于芯波导的厚度，因此获得了波导宽度方向的良好的光学限制，能够有效地且集中地使稀土元素掺杂层吸收光。从而可以实现励磁功率的励磁效率的显着提高。因此，通过少量添加稀土元素可实现增强的激发效率，并且提供不具有浓度消光的高增益光放大波导。

2. 发明授权

US5134672A Optical waveguide type star coupler 失效
标题翻译：光波导型星型联轴器
公开(公告)号：US5134672A
公开(公告)日：1992-07-28
申请号：US509972
申请日：1990-04-16
申请人： Katsuyuki Imoto , Masataka Nakazawa , Yasuo Kimura
发明人： Katsuyuki Imoto , Masataka Nakazawa , Yasuo Kimura
IPC分类号： G02B6/122 , G02B6/28 , G02F1/313 , G02F1/35 , H01S3/06 , H01S3/063 , H01S3/10
CPC分类号： H01S3/063 , G02B6/2804
摘要： An optical waveguide star coupler includes a light propagating core provided on a substrate. An exciting light and a signal light are supplied to the light propagating core. The light propagating core includes a plurality of Y-branching waveguides connected one after another to provide a multi-stage waveguide structure. A signal light inputted in the core is combined during the propagation through the core with the exciting light so that the signal light is amplified.
摘要翻译：光波导星形耦合器包括设置在基板上的光传播芯。向光传播芯提供激发光和信号光。光传播芯包括多个依次连接的Y分支波导，以提供多级波导结构。输入到芯中的信号光在通过芯通过激发光的传播期间被组合，使得信号光被放大。

3. 发明授权

US07715724B2 Optical synchronizer 有权
标题翻译：光同步器
公开(公告)号：US07715724B2
公开(公告)日：2010-05-11
申请号：US11057365
申请日：2005-02-15
申请人： Shigeki Watanabe , Masataka Nakazawa
发明人： Shigeki Watanabe , Masataka Nakazawa
IPC分类号： H04B10/00
CPC分类号： H04B10/25137
摘要： The phase modulation in which the frequency chirp becomes 0 at the timing which the user wants to synchronize, and the frequency chirp becomes larger as the time deviates in a positive or negative direction from this timing is applied to the signal light with each wavelength comprising pulse train of different timing. Thus, the optical pulses which deviate from the timing which the user wants to synchronize receive the frequency chirp in accordance with the amount of the timing deviation. The WDM signal light which has been chirped in this way is made to pass a linear dispersive medium, and the dispersion fit for the amount of frequency chirp is made to be given. By adjusting the amount of dispersion, it is possible to obtain the pulses which conform to the timing at which the user wants to synchronize the pulses of each wavelength.
摘要翻译：在用户想要同步的定时，频率啁啾变为0的相位调制，并且随着从该定时向正或负方向偏离的时间，频率啁啾变大，对每个波长包括脉冲的信号光不同时间的火车因此，偏离用户想要同步的定时的光脉冲根据定时偏差量接收频率啁啾声。已经以这种方式啁啾的WDM信号光通过线性色散介质，并且给出了频率啁啾量的色散配合。通过调整色散量，可以获得符合用户想要使每个波长的脉冲同步的定时的脉冲。

4. 发明申请

US20100067100A1 LASER OSCILLATOR 有权
标题翻译：激光振荡器
公开(公告)号：US20100067100A1
公开(公告)日：2010-03-18
申请号：US12422758
申请日：2009-04-13
申请人： Kazunori Shiota , Shin Masuda , Masataka Nakazawa , Masato Yoshida
发明人： Kazunori Shiota , Shin Masuda , Masataka Nakazawa , Masato Yoshida
IPC分类号： H04B10/17 , H01S3/00
CPC分类号： H01S3/06791 , H01S3/0675 , H01S3/08 , H01S3/094042 , H01S3/1109 , H01S3/1118
摘要： A laser oscillator includes a ring resonator. The ring resonator includes an optical circulator having first, second, third, and fourth ports and a first optical amplification fiber connected to the optical circulator. Light incident on the first port is exited from the second port, and light incident on the second port is exited from the third port. The fourth port provides an exciting light and injects the exciting light into the ring resonator through the first port. The first optical amplification fiber amplifies light exited from the third port with the exciting light provided by the fourth port. The laser oscillator also includes an optical member connected to the optical circulator. The optical member reflects at least a part of the light exited from the second port and injects the same into the second port again.
摘要翻译：激光振荡器包括环形谐振器。环形谐振器包括具有第一，第二，第三和第四端口的光循环器和连接到光循环器的第一光放大光纤。第一个港口的光线从第二个港口出发，第二个港口的光线从第三个港口出来。第四个端口提供激发光，并通过第一个端口将激发光注入环形谐振器。第一光放大光纤利用由第四端口提供的激发光放大从第三端口退出的光。激光振荡器还包括连接到光循环器的光学构件。光学构件反射从第二端口退出的光的至少一部分，并再次将其注入第二端口。

5. 发明申请

US20070273958A1 Optical fourier transform device and method 有权
标题翻译：光学傅立叶变换装置及方法
公开(公告)号：US20070273958A1
公开(公告)日：2007-11-29
申请号：US10584932
申请日：2004-12-27
申请人： Toshihiko Hirooka , Masataka Nakazawa
发明人： Toshihiko Hirooka , Masataka Nakazawa
IPC分类号： G02F1/35
CPC分类号： G02F1/3515 , G01J11/00
摘要： Optical Fourier transform is executed over a wide time range. A quadratic function type optical pulse generator (7) generates a control light pulse of a shape expressed by a quadratic function or a parabola according to a clock signal based on a signal light pulse from an optical coupler (1). The signal light pulse inputted is multiplexed by a multiplexer (9) with the control light pulse optically delayed by an optical delay element (8) so that the timing is matched with the signal light pulse, and introduced into an optical Kerr medium (10). In the optical Kerr medium (10), the signal light pulse inputted by the mutual phase modulation between the signal light pulse and the control light pulse is subjected to a linear phase modulation (frequency chirp) over the entire pulse or a wide time range. After that, the signal light pulse isolated by an optical filter (11) is introduced into the dispersion medium (12) having a group velocity dispersion (secondary dispersion), thereby converting the time waveform of the inputted signal light pulse into the shape of the frequency spectrum.
摘要翻译：光学傅里叶变换在较宽的时间范围内执行。二次函数型光脉冲发生器（7）根据来自光耦合器（1）的信号光脉冲的时钟信号产生由二次函数或抛物线表示的形状的控制光脉冲。输入的信号光脉冲由多路复用器（9）与由光延迟元件（8）光延迟的控制光脉冲进行复用，使得定时与信号光脉冲匹配，并被引入光学克尔介质（10）。在光学克尔介质（10）中，通过信号光脉冲和控制光脉冲之间的相位调制输入的信号光脉冲在整个脉冲或宽时间范围内经受线性相位调制（频率啁啾）。之后，将由滤光器（11）隔离的信号光脉冲引入到具有组速度色散（二次色散）的分散介质（12）中，从而将输入的信号光脉冲的时间波形转换为频谱。

6. 发明授权

US07428096B2 Optical pulse compressor, optical function generator, optical pulse compression method, and optical function generation method 有权
标题翻译：光脉冲压缩机，光学函数发生器，光脉冲压缩法，光学函数生成法等
公开(公告)号：US07428096B2
公开(公告)日：2008-09-23
申请号：US10553649
申请日：2004-03-23
申请人： Masataka Nakazawa , Toshihiko Hirooka
发明人： Masataka Nakazawa , Toshihiko Hirooka
IPC分类号： G02F1/35 , G02F2/02
CPC分类号： H01S3/0057 , G02F1/0553 , G02F2203/26 , H04B10/508
摘要： A small-sized, high-functionality optical pulse compressor capable of generating a low-power, high-repetition-frequency ultrashort pulse train used for ultrafast optical communication and photometry, and a simple-structure optical function generator for realizing an arbitrary time waveform. The optical pulse compressor comprises and optical Fourier transform device (F) having an optical phase modulator (9) driven by the repetition-frequency of an input optical pulse train and a dispersive medium (8), for converting the shape of an input optical pulse frequency spectrum into its time waveform, and an optical filter (3) inserted ahead of the optical Fourier transform device (F), for reducing the spectrum width of an input optical pulse, wherein the optical Fourier transform device (F) converts a small-spectrum-width optical pulse output from the optical function generator generates an optical pulse. The optical function generator generates an optical pulse having an arbitrary time waveform by reproducing, as it is, a spectrum waveform-shaped arbitrarily by an optical filter on a time-axis by the optical Fourier transform device (F).
摘要翻译：一种能够产生用于超快速光通信和光度测量的低功率，高重复频率超短脉冲串的小尺寸，高功能的光脉冲压缩器，以及用于实现任意时间波形的简单结构的光学函数发生器。光脉冲压缩机包括具有由输入光脉冲串的重复频率驱动的光相位调制器（9）和色散介质（8）的光学傅里叶变换装置（F），用于转换输入光脉冲的形状频谱到其时间波形，以及插入光傅立叶变换装置（F）前面的滤光器（3），用于降低输入光脉冲的光谱宽度，其中光傅里叶变换装置（F）来自光学函数发生器的光谱宽度光脉冲输出产生光脉冲。光学函数发生器通过由傅里叶逆变换装置（F）在时间轴上任意地再现由光学滤波器任意地形成的波形波形，产生具有任意时间波形的光脉冲。

7. 发明授权

US07130752B2 Measuring-instrument remote-calibration system and measuring-instrument remote-calibration method 有权
标题翻译：测量仪器远程校准系统和测量仪器远程校准方法
公开(公告)号：US07130752B2
公开(公告)日：2006-10-31
申请号：US10697321
申请日：2003-10-31
申请人： Haruo Yoshida , Hirokazu Matsumoto , Yoshio Hino , Masaru Arai , Masataka Nakazawa
发明人： Haruo Yoshida , Hirokazu Matsumoto , Yoshio Hino , Masaru Arai , Masataka Nakazawa
IPC分类号： G01D18/00 , H04B1/04
CPC分类号： G01D18/00
摘要： In a measuring-instrument remote-calibration system and measuring-instrument remote-calibration method, a measuring standard quantity is converted into a parameter adapted for communication, or based on measuring standard quantity, a parameter adapted for communication is generated and sent to a remote place. Alternatively, when the measuring standard quantity is not suitable for communication, it is converted into a form adapted for transportation and the converted measuring standard quantity is sent to a remote place. After the converted measuring standard quantity reaches the place, it is restored to the original measuring standard quantity, thus enabling calibration. The result of the calibration is certified.
摘要翻译：在测量仪器远程校准系统和测量仪器远程校准方法中，将测量标准量转换为适合通信的参数，或者根据测量标准量，生成适用于通信的参数并发送到远程地点。或者，当测量标准量不适于通信时，将其转换为适于运输的形式，并将转换的测量标准量发送到偏远的地方。转换后的测量标准量到达该位置后，恢复为原始测量标准量，从而进行校准。校准的结果经过认证。

8. 发明申请

US20050185965A1 Optical synchronizer 有权
标题翻译：光同步器
公开(公告)号：US20050185965A1
公开(公告)日：2005-08-25
申请号：US11057365
申请日：2005-02-15
申请人： Shigeki Watanabe , Masataka Nakazawa
发明人： Shigeki Watanabe , Masataka Nakazawa
IPC分类号： G02F1/05 , G02F1/35 , G02F3/00 , H04B10/25 , H04B10/29 , H04B10/508 , H04B10/516 , H04B10/548 , H04B10/58 , H04B10/61 , H04B10/00
CPC分类号： H04B10/25137
摘要： The phase modulation in which the frequency chirp becomes 0 at the timing which the user wants to synchronize, and the frequency chirp becomes larger as the time deviates in a positive or negative direction from this timing is applied to the signal light with each wavelength comprising pulse train of different timing. Thus, the optical pulses which deviate from the timing which the user wants to synchronize receive the frequency chirp in accordance with the amount of the timing deviation. The WDM signal light which has been chirped in this way is made to pass a linear dispersive medium, and the dispersion fit for the amount of frequency chirp is made to be given. By adjusting the amount of dispersion, it is possible to obtain the pulses which conform to the timing at which the user wants to synchronize the pulses of each wavelength.
摘要翻译：在用户想要同步的定时，频率啁啾变为0的相位调制，并且随着从该定时向正或负方向偏离的时间，频率啁啾变大，对每个波长包括脉冲的信号光不同时间的火车因此，偏离用户想要同步的定时的光脉冲根据定时偏差量接收频率啁啾声。已经以这种方式啁啾的WDM信号光通过线性色散介质，并且给出了频率啁啾量的色散配合。通过调整色散量，可以获得符合用户想要使每个波长的脉冲同步的定时的脉冲。

9. 发明授权

US6101021A Optical pulse generator 失效
公开(公告)号：US6101021A
公开(公告)日：2000-08-08
申请号：US349225
申请日：1999-07-08
申请人： Yoshihiro Kumagai , Akio Ichikawa , Rikihiro Iida , Masataka Nakazawa , Eiji Yoshida
发明人： Yoshihiro Kumagai , Akio Ichikawa , Rikihiro Iida , Masataka Nakazawa , Eiji Yoshida
IPC分类号： G02F1/01 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/083 , H01S3/098 , H01S3/10 , G02F1/00
CPC分类号： H01S3/06791 , H01S3/1109 , H04B10/503 , H04B10/508 , H04B10/564 , G02F2203/26 , H01S3/06754 , H01S3/10038 , H01S3/1121 , H01S3/136
摘要： According to the present invention, damage to a photo-detector disposed in clock signal extractor by means of an optical pulse having an optical power exceeding a rated value is prevented. A ring resonator generates a repetitive, high-frequency optical pulse. Optical branching circuit branches a portion of the optical pulse circulating through ring resonator, while optical branching circuit further branches a portion thereof to protective device. Pumping source generates an excitation light for exciting a rare-earth doped optical fiber. Optical multiplexer couples the optical pulse branched by optical branching circuit, and the excitation light. Upon excitation by means of the excitation light, rare-earth doped optical fiber amplifies and emits the incoming optical pulse. The optical power of the excitation light is adjusted such that the output of rare-earth doped optical fiber reaches a saturation power. Optical switch blocks the incoming optical pulse during the time period when pumping source is not emitting an excitation light, and during a fixed time period following the emission of the excitation light. In this manner, the entry of an excessively large optical pulse exceeding the saturation power into photo-detector at the time of starting up the power source is prevented. Optical attenuator attenuates the optical power of the optical pulse emitted from optical switch to an optical power which the photo-detector is capable of photo-detecting. Photo-detector converts the optical pulse emitted from protective device into an electronic signal; narrow band filter extracts a clock signal from the output of photo-detector; and electric amplifier amplifies the output of narrow band filter, and outputs a clock signal. Phase shifter adjusts the phase of this clock signal; electric amplifier amplifies the output of phase shifter, and outputs a clock signal to optical modulator. Optical modulator modulates the intensity of the light circulating through the ring resonator based on the clock signal, and generates an optical pulse.

10. 发明授权

US5695880A Lead-containing fluoride glass, optical fiber and process for producing it 失效
标题翻译：含铅氟化玻璃，光纤及其生产工艺
公开(公告)号：US5695880A
公开(公告)日：1997-12-09
申请号：US399144
申请日：1995-03-06
申请人： Takashi Kogo , Hiroo Kanamori , Masashi Onishi , Yoshiaki Miyajima , Masataka Nakazawa
发明人： Takashi Kogo , Hiroo Kanamori , Masashi Onishi , Yoshiaki Miyajima , Masataka Nakazawa
IPC分类号： C03B37/012 , C03C3/32 , C03C13/04 , G02B6/00 , B32B9/00
CPC分类号： C03C3/325 , C03B37/01211 , C03B37/01268 , C03C13/042 , C03B2201/82 , C03B2203/24 , Y10T428/2929 , Y10T428/2933 , Y10T428/2958 , Y10T428/2964
摘要： Lead-containing fluoride glass comprises 50-70 mol % of ZrF.sub.4, 3-5 mol % of LaF.sub.3, 0.1-3 mol % of YF.sub.3, and 2-15 mol % of NaF and/or LiF and/or CsF, where LaF.sub.3 +YF.sub.3 =4.5-6 mol %, and further comprises lead. An optical fiber comprises a core made of the lead-containing fluoride glass and a cladding surrounding the core. A process for producing an optical fiber comprises forming a base material for a core of the lead-containing fluoride glass, forming a base material for a cladding of fluoride glass containing 30-60 mol % of HfF.sub.4, and drawing the base materials into an optical fiber at a drawing temperature of 315-340 .degree. C.
摘要翻译：含铅氟化物玻璃包含50-70摩尔％的ZrF 4，3-5摩尔％的LaF 3，0.1-3摩尔％的YF 3和2-15摩尔％的NaF和/或LiF和/或CsF，其中LaF 3 + YF3 = 4.5-6mol％，进一步包含铅。光纤包括由含铅氟化物玻璃制成的芯和围绕芯的包层。一种制造光纤的方法包括：形成含铅氟化物玻璃的芯的基材，形成含有30-60摩尔％HfF 4的氟化物玻璃的包层用基材，将该基材拉伸成光学纤维的拉伸温度为315-340℃

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