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1. 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.

2. 发明授权

US6108465A Optical pulse generator 失效
标题翻译：光脉冲发生器
公开(公告)号：US6108465A
公开(公告)日：2000-08-22
申请号：US172255
申请日：1998-10-14
申请人： Rikihiro Iida , Akio Ichikawa , Yoshihiro Kumagai , Yuka Asahina , Masataka Nakazawa , Eiji Yoshida
发明人： Rikihiro Iida , Akio Ichikawa , Yoshihiro Kumagai , Yuka Asahina , Masataka Nakazawa , Eiji Yoshida
IPC分类号： H01S3/06 , H01S3/083 , H01S3/098 , H01S3/10 , H01S3/136 , G02B6/26
CPC分类号： H01S3/06791 , H01S3/06725 , H01S3/08 , H01S3/1109
摘要： The object of the present invention is to provide an optical pulse generator which very stably generates for a long period of time a high cycling frequency optical pulse chain. In order to obtain this object, in a ring type resonator R, the present invention provides an optical path length regulator 14 which performs high precision optical path length adjustment and an optical path length regulator 60 which performs wide range optical path length adjustment, and extracts a clock signal by converting an optical pulse emitted from the ring type resonator R to an electrical signal by a clock extractor 42, detects the frequency difference between a base frequency signal output form a synthesizer 52 by a frequency difference detector 50, and controls said optical path length regulator 14 and said optical path length regulator 60.
摘要翻译：本发明的目的是提供一种光脉冲发生器，该光脉冲发生器长时间稳定地产生高循环频率的光脉冲链。为了获得这个目的，在环型谐振器R中，本发明提供一种执行高精度光程长度调节的光路长度调节器14和执行宽范围光程长度调节的光程长度调节器60，并且提取通过时钟提取器42将从环形谐振器R发射的光脉冲转换为电信号的时钟信号通过频率差检测器50检测由合成器52输出的基频信号之间的频差，并控制所述光路径长度调节器14和所述光程长度调节器60。

3. 发明授权

US5583959A Optical pulse compression device 失效
标题翻译：光脉冲压缩装置
公开(公告)号：US5583959A
公开(公告)日：1996-12-10
申请号：US450533
申请日：1995-05-25
申请人： Masataka Nakazawa , Eiji Yoshida
发明人： Masataka Nakazawa , Eiji Yoshida
IPC分类号： G02F1/35 , G02B6/26 , H01S3/00 , H01S3/30
CPC分类号： H04B10/25077 , G02F1/3513
摘要： A pulse compression device is disclosed for generating ultra short pulses in the femtosecond range In the device an input soliton is subjected to pulse width compression by propagation in a rare-earth doped optical fiber having a gradually diminishing group velocity dispersion from an input end to an output end. The pulse compression is produced by the diminishing dispersion value of the optical fiber as well as by adiabatic narrowing generated by a pumping light coupled, through an optical coupler, to the optical fiber by increasing the energy of the input soliton propagating in the optical fiber. By adjusting the light power of the pumping light, the pulse width of the soliton can be freely controlled.
摘要翻译：公开了一种用于在飞秒范围内产生超短脉冲的脉冲压缩装置。在装置中，输入孤子通过在具有从输入端逐渐减小的群速度色散的稀土掺杂光纤中传播而进行脉冲宽度压缩输出端。脉冲压缩是通过光纤的色散值的减小以及通过光耦合器耦合到泵浦光而产生的绝热变窄产生的，这是通过增加在光纤中传播的输入孤子的能量来产生的。通过调整泵浦光的光功率，可以自由地控制孤子的脉冲宽度。

4. 发明授权

US06333942B1 Atomic frequency standard laser pulse oscillator 有权
标题翻译：原子频率标准激光脉冲振荡器
公开(公告)号：US06333942B1
公开(公告)日：2001-12-25
申请号：US09461181
申请日：1999-12-14
申请人： Masataka Nakazawa , Eiji Yoshida
发明人： Masataka Nakazawa , Eiji Yoshida
IPC分类号： H01S310
CPC分类号： H01S3/06791 , G04F5/14 , H01S3/1109 , H01S3/1121 , H01S3/1394
摘要： An ultra-stable microwave output with less jitter than a prior art atomic oscillator is obtained and an ultra-short optical pulse train is generated with a repetition frequency stabilized at the same level as a time standard. The repetition frequency of a regeneratively mode-locked laser pulse oscillator with a superior low-jitter characteristic is locked directly to a resonance frequency of various atoms. The oscillator provides the means for detecting the frequency difference between the clock signal frequency and a predetermined atomic resonance frequency and outputting it as an error signal, a cavity length tuning device for varying the length of a laser cavity so that the clock signal frequency and the predetermined resonance frequency coincide, and a device for negatively feeding back the error signal output from the frequency difference detection device to the cavity length tuning device. This allows the generation of an optical pulse train (optical output) and a clock signal (microwave output) of a repetition frequency stabilized to the predetermined atomic resonance frequency.
摘要翻译：获得具有比现有技术的原子振荡器更少的抖动的超稳定微波输出，并且产生具有稳定在与时间标准相同水平的重复频率的超短光脉冲串。具有优异低抖动特性的再生锁模激光脉冲振荡器的重复频率直接锁定到各种原子的共振频率。振荡器提供用于检测时钟信号频率和预定原子共振频率之间的频率差并将其作为误差信号输出的装置，用于改变激光腔的长度的腔长调谐装置，使得时钟信号频率和预定的谐振频率一致，以及用于将从频差检测装置输出的误差信号负反馈给腔长调谐装置的装置。这允许产生稳定到预定原子共振频率的重复频率的光脉冲串（光输出）和时钟信号（微波输出）。

5. 发明授权

US5926492A Laser pulse oscillator 失效
标题翻译：激光脉冲振荡器
公开(公告)号：US5926492A
公开(公告)日：1999-07-20
申请号：US919354
申请日：1997-08-28
申请人： Eiji Yoshida , Masataka Nakazawa
发明人： Eiji Yoshida , Masataka Nakazawa
IPC分类号： G02B26/00 , G02F1/01 , H01S3/06 , H01S3/067 , H01S3/098 , H01S3/139 , H04B10/00 , H04B10/508 , H04B10/524 , H04B10/54 , H04B10/564 , H01S3/07 , H01S3/10
CPC分类号： H01S3/06791 , H01S3/1109 , H01S3/1121 , H01S3/1394
摘要： A harmonically and regeneratively mode-locked laser pulse oscillator having a clock extraction circuit for picking up from a fragment of a laser output a clock signal corresponding to a high-order integer multiple of the fundamental frequency determined by the cavity length of the laser, a phase shifter and an electric amplifier for driving an optical modulator disposed in the laser cavity at the frequency of the clock signal. The laser pulse oscillator has a phase-locked loop including a phase comparator for detecting the phase difference between the clock signal and an external signal fed from a synthesizer with its frequency fixed, a fiber stretcher for controlling the cavity length such that the repetition rate frequency of the laser pulse oscillator is locked to the external signal, and an electric filter and electric amplifier for expanding and contracting the fiber length by feeding back the phase difference detected by the phase comparator to the fiber stretcher. This makes it possible to lock the repetition rate frequency of the optical pulse train to the external signal, and to generate the stabilized, fixed frequency optical pulse train with a high repetition rate over a long time period.
摘要翻译：具有用于从激光片拾取的时钟提取电路的谐振和再生模式锁定激光脉冲振荡器输出对应于由激光器的腔体长度确定的基频的高次整数倍的时钟信号，移相器和用于以时钟信号的频率驱动设置在激光器腔中的光学调制器的电放大器。激光脉冲振荡器具有锁相环，该锁相环包括用于检测时钟信号与从其频率固定的合成器馈送的外部信号之间的相位差的相位比较器，用于控制腔体长度的光纤拉伸器，使得重复频率频率的激光脉冲振荡器被锁定到外部信号，以及电滤波器和电放大器，用于通过将相位比较器检测到的相位差反馈到光纤拉伸器来扩展和收缩光纤长度。这使得可以将光脉冲串的重复率频率锁定到外部信号，并且可以在长时间段内产生具有高重复率的稳定的固定频率光脉冲串。

6. 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。

7. 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。

8. 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。

9. 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。

10. 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。

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