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1. 发明授权

US08170071B2 Laser apparatus 有权
标题翻译：激光设备
公开(公告)号：US08170071B2
公开(公告)日：2012-05-01
申请号：US12398191
申请日：2009-03-05
申请人： Masataka Nakazawa , Akihito Suzuki , Toshihiko Hirooka , Masato Yoshida , Kazunori Shiota
发明人： Masataka Nakazawa , Akihito Suzuki , Toshihiko Hirooka , Masato Yoshida , Kazunori Shiota
IPC分类号： H01S3/30
CPC分类号： H01S3/0675 , H01S3/06712 , H01S3/06791 , H01S3/08031 , H01S3/09415 , H01S3/1608 , H01S3/1693
摘要： Provided is a laser apparatus including: a DFB fiber laser 40 including, as an amplitude medium, a rare earth doped silica optical fiber codoped with a high concentration of aluminum; an optical feedback path 50 formed by a ring-shaped optical fiber; and an optical coupler 70 a) feeding back a part of an output of the DFB fiber laser 40 to the DFB fiber laser 40 via the optical feedback path 50, and b) outputting, to outside, another part of the output of the DFB fiber laser 40, where the optical fiber forming the optical feedback path 50 is longer than a length at which a relaxation oscillation noise in the output to the outside becomes −110 dB/Hz.
摘要翻译：提供了一种激光装置，其包括：DFB光纤激光器40，其包括作为振幅介质的掺杂有高浓度铝的稀土掺杂二氧化硅光纤; 由环形光纤形成的光学反馈路径50; 和光耦合器70a）经由光反馈路径50将DFB光纤激光器40的输出的一部分反馈到DFB光纤激光器40，以及b）向DFB光纤输出的另一部分输出外部激光器40，其中形成光学反馈路径50的光纤比输出到外部的弛豫振荡噪声变为-110dB / Hz的长度长。

2. 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。

3. 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。

4. 发明申请

US20070025728A1 Optical pulse compressor and optical function generator, optical pulse compressing method and optical function generating method 有权
标题翻译：光脉冲压缩机和光学函数发生器，光脉冲压缩方法和光学功能生成方法
公开(公告)号：US20070025728A1
公开(公告)日：2007-02-01
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： H04B10/00
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 ultralast 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 tch optical Fourier transform device (F).
摘要翻译：一种能够产生用于超级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机，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时间轴由tch光学傅立叶变换装置（F）再现由光学滤波器任意地进行光谱波形形成，产生具有任意时间波形的光脉冲。

5. 发明申请

US20070109957A1 Otdm transmission method and apparatus 有权
标题翻译： Otdm传输方法和装置
公开(公告)号：US20070109957A1
公开(公告)日：2007-05-17
申请号：US10562163
申请日：2004-03-23
申请人： Toshihiko Hirooka , Masataka Nakazawa
发明人： Toshihiko Hirooka , Masataka Nakazawa
IPC分类号： H04J11/00
CPC分类号： H04B10/503 , H04J14/08
摘要： An OTDM transmitting method and transmitter realizing an OTDM distortion-free transmission substantially not relying upon dispersion. A time division multiplexed OTDM signal from an OTDM signal transmitter (1) enters an optical Fourier transform unit (2). Optical Fourier transform can be carried out most accurately so long as the optical pulse is a chirp-free Fourier transform limit pulse. The optical Fourier transform unit (2) converts the time waveform of the pulse into a signal on the frequency axis, and an optical inverse Fourier transform unit (2′) converts a spectral shape on the frequency axis into a time waveform (pulse). An optical fiber transmission line (3) is a transmission line having an arbitrary dispersion and a polarization mode dispersion. These dispersions may involve a time variation. An OTDM signal receiver (4) demultiplexes a transmission signal into low-speed optical signals, in a light region, receives optical pulses for respective channels and converts them into electric signals.
摘要翻译：实现基本上不依赖于色散的OTDM无失真传输的OTDM发送方法和发射机。来自OTDM信号发射机（1）的时分复用OTDM信号进入光傅立叶变换单元（2）。只要光脉冲是无啁啾的傅里叶变换极限脉冲，光学傅里叶变换就可以进行最精确。光学傅立叶变换单元（2）将脉冲的时间波形转换为频率轴上的信号，并且光学傅里叶逆变换单元（2'）将频率轴上的频谱形状转换为时间波形（脉冲）。光纤传输线（3）是具有任意色散和偏振模色散的传输线。这些分散体可能涉及时间变化。 OTDM信号接收机（4）将发送信号解复用为低速光信号，在光区域中，接收各通道的光脉冲并将其转换为电信号。

6. 发明申请

US20060232847A1 Optical transmission method and optical transmission device 失效
标题翻译：光传输方式及光传输装置
公开(公告)号：US20060232847A1
公开(公告)日：2006-10-19
申请号：US10543342
申请日：2004-01-23
申请人： Toshihiko Hirooka , Masataka Nakazawa
发明人： Toshihiko Hirooka , Masataka Nakazawa
IPC分类号： G02B26/00
CPC分类号： H04B10/25137 , H04B10/25133
摘要： To compensate a waveform distortion by using a nature that a spectral shape is perfectly retained even if all the linear distortions occur on a time-axis. An optical pulse transmitted from an optical pulse transmitter (1) via an optical fiber transmission line (2) is transmitted. An optical Fourier transformer (3) receives an optical pulse, and optically Fourier-transforms an optical pulse on a time-axis onto a frequency-axis to reproduce the frequency spectrum of an optical pulse on a time-axis be effecting switching between frequency and time, thereby compensating a waveform distortion by a linear effect on the optical fiber transmission line (2). A photodetector (4) receives an optical pulse from the optical Fourier transformer (3) and transforms this into an electrical signal to thereby obtain a pulse waveform before a transmission over the optical fiber transmission line (2).
摘要翻译：通过使用即使在时间轴上出现所有线性失真也能完全保留光谱形状的性质来补偿波形失真。发射经由光纤传输线（2）从光脉冲发射器（1）发射的光脉冲。光傅里叶变换器（3）接收光脉冲，并且将时间轴上的光脉冲光学傅里叶变换到频率轴上，以在时间轴上再现光脉冲的频谱，正在进行频率与从而通过对光纤传输线（2）的线性效应来补偿波形失真。光检测器（4）从光傅里叶变换器（3）接收光脉冲，并将其转换为电信号，从而在通过光纤传输线（2）传输之前获得脉搏波形。

7. 发明授权

US07747175B2 Optical transmission method and optical transmission apparatus 失效
标题翻译：光传输方法和光传输装置
公开(公告)号：US07747175B2
公开(公告)日：2010-06-29
申请号：US10543342
申请日：2004-01-23
申请人： Toshihiko Hirooka , Masataka Nakazawa
发明人： Toshihiko Hirooka , Masataka Nakazawa
IPC分类号： G02B26/00
CPC分类号： H04B10/25137 , H04B10/25133
摘要： To compensate a waveform distortion by using a nature that a spectral shape is perfectly retained even if all the linear distortions occur on a time-axis. An optical pulse transmitted from an optical pulse transmitter (1) via an optical fiber transmission line (2) is transmitted. An optical Fourier transformer (3) receives an optical pulse, and optically Fourier-transforms an optical pulse on a time-axis onto a frequency-axis to reproduce the frequency spectrum of an optical pulse on a time-axis be effecting switching between frequency and time, thereby compensating a waveform distortion by a linear effect on the optical fiber transmission line (2). A photodetector (4) receives an optical pulse from the optical Fourier transformer (3) and transforms this into an electrical signal to thereby obtain a pulse waveform before a transmission over the optical fiber transmission line (2).
摘要翻译：通过使用即使在时间轴上出现所有线性失真也能完全保留光谱形状的性质来补偿波形失真。发射经由光纤传输线（2）从光脉冲发射器（1）发射的光脉冲。光傅里叶变换器（3）接收光脉冲，并且将时间轴上的光脉冲光学傅里叶变换到频率轴上，以在时间轴上再现光脉冲的频谱，正在进行频率与从而通过对光纤传输线（2）的线性效应来补偿波形失真。光检测器（4）从光傅里叶变换器（3）接收光脉冲，并将其转换为电信号，从而在通过光纤传输线（2）传输之前获得脉搏波形。

8. 发明授权

US07672593B2 OTDM transmission method and apparatus 有权
标题翻译： OTDM传输方法和装置
公开(公告)号：US07672593B2
公开(公告)日：2010-03-02
申请号：US10562163
申请日：2004-03-23
申请人： Toshihiko Hirooka , Masataka Nakazawa
发明人： Toshihiko Hirooka , Masataka Nakazawa
IPC分类号： H04J11/00
CPC分类号： H04B10/503 , H04J14/08
摘要： An OTDM transmitting method and transmitter realizing an OTDM distortion-free transmission substantially not relying upon dispersion. A time division multiplexed OTDM signal from an OTDM signal transmitter (1) enters an optical Fourier transform unit (2). Optical Fourier transform can be carried out most accurately so long as the optical pulse is a chirp-free Fourier transform limit pulse. The optical Fourier transform unit (2) converts the time waveform of the pulse into a signal on the frequency axis, and an optical inverse Fourier transform unit (2′) converts a spectral shape on the frequency axis into a time waveform (pulse). An optical fiber transmission line (3) is a transmission line having an arbitrary dispersion and a polarization mode dispersion. These dispersions may involve a time variation. An OTDM signal receiver (4) demultiplexes a transmission signal into low-speed optical signals, in a light region, receives optical pulses for respective channels and converts them into electric signals.
摘要翻译：实现基本上不依赖于色散的OTDM无失真传输的OTDM发送方法和发射机。来自OTDM信号发射机（1）的时分复用OTDM信号进入光傅立叶变换单元（2）。只要光脉冲是无啁啾的傅里叶变换极限脉冲，光学傅里叶变换就可以进行最精确。光学傅立叶变换单元（2）将脉冲的时间波形转换为频率轴上的信号，光学傅里叶逆变换单元（2'）将频率轴上的频谱形状转换为时间波形（脉冲）。光纤传输线（3）是具有任意色散和偏振模色散的传输线。这些分散体可能涉及时间变化。 OTDM信号接收机（4）将发送信号解复用为低速光信号，在光区域中，接收各通道的光脉冲并将其转换为电信号。

9. 发明授权

US07352504B2 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：US07352504B2
公开(公告)日：2008-04-01
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 , G02F2/02
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。

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