公开(公告)号：US5080486A

公开(公告)日：1992-01-14

申请号：US581596

申请日：1990-09-12

申请人： Masataka Shirasaki ,  Hirochika Nakajima ,  Yukimitsu Watanabe ,  Rinichiro Yamamoto

发明人： Masataka Shirasaki ,  Hirochika Nakajima ,  Yukimitsu Watanabe ,  Rinichiro Yamamoto

IPC分类号： G01J3/18 ,  G02B5/30 ,  G02B27/28

CPC分类号： G01J3/18 ,  G02B27/283 ,  G02B5/3083 ,  G01J3/0224

摘要： In spectrum measuring equipment the light to be measured is separated by a double-image polarizing element into two polarized wave components whose planes of polarization cross each other perpendicular and which have different optical axes. The two polarized wave components are applied to a dispersing element so that their planes of polarization intersect the direction of light separation at .+-.45.degree. thereto, respectively. The sum of optical powers of the two polarized wave components separated by the dispersing element is measured by a photodetector, so that spectrum measurement independent of the polarization of the light to be measured can be achieved.

公开(公告)号：US4806442A

公开(公告)日：1989-02-21

申请号：US841801

申请日：1986-03-20

申请人： Masataka Shirasaki ,  Hirochika Nakajima

发明人： Masataka Shirasaki ,  Hirochika Nakajima

IPC分类号： G03F7/00 ,  G03F9/00

CPC分类号： G03F7/001 ,  Y10S359/90

摘要： Spatial phase modulating transparent masks comprising two or more portions having two different optical paths and their production processes are disclosed. The transparent masks are particularly useful as an exposure mask in the production of phase-shifted, distributed feedback (DFB) semiconductor lasers for a single-mode operation. A process for the formation of phase-shifted diffraction gratings or corrugations which comprises exposing a substrate, through the above transparent mask, to exposure radiation is also disclosed. According to the present invention, the phase-shifted diffraction gratings can be easily and directly produced with a high accuracy and reliability.

摘要翻译： 公开了包括具有两个不同光路的两个或多个部分及其制造方法的空间相位调制透明掩模。 透明掩模在用于单模操作的相移分布反馈（DFB）半导体激光器的生产中作为曝光掩模特别有用。 还公开了用于形成相移衍射光栅或波纹的方法，其包括通过上述透明掩模将衬底暴露于曝光辐射。 根据本发明，可以以高精度和可靠性容易且直接地生产相移衍射光栅。

公开(公告)号：US4637027A

公开(公告)日：1987-01-13

申请号：US654628

申请日：1984-09-26

申请人： Masataka Shirasaki ,  Hirochika Nakajima ,  Yasuo Furukawa ,  Takefumi Inagaki

发明人： Masataka Shirasaki ,  Hirochika Nakajima ,  Yasuo Furukawa ,  Takefumi Inagaki

IPC分类号： H01S3/10 ,  G01R33/032 ,  H01S3/106 ,  H01S5/14

CPC分类号： G01R33/0322 ,  H01S3/1066 ,  H01S5/14

摘要： Disclosed is a laser light source device having a laser and an external resonator, wherein as a base, a Faraday rotator is provided at the laser side front of a reflection plane of the resonator so that clockwise and counter-clockwise circular polarizations which have frequencies slightly different to each other are generated, and if a laser such as a semiconductor laser having an eigen-mode having a linear polarization is applied, elements which rotate a polarization by 90 degrees by one emission-and-return through the element, for example, quarter-wave plates, are arranged, The device does not need a strong magnetic field or a strong electric field, and can easily generate lights which are a constant strength. Thus the device can be miniaturized and a high efficiency obtained.

摘要翻译： 公开了一种具有激光器和外部谐振器的激光光源装置，其中作为基座，法拉第转子设置在谐振器的反射面的激光侧前面，使得具有稍微频率的顺时针和逆时针圆偏振 产生彼此不同的元件，并且如果施加具有本征模式具有线性偏振的半导体激光器的激光器，则通过元件的一次发射和返回将偏振旋转90度的元件，例如， 配置四分之一波片，该器件不需要强磁场或强电场，并且可以轻松地产生恒定强度的光。 因此，该装置可以小型化并且获得高效率。

公开(公告)号：US06390633B1

公开(公告)日：2002-05-21

申请号：US09875919

申请日：2001-06-08

申请人： Masataka Shirasaki ,  Simon Cao

发明人： Masataka Shirasaki ,  Simon Cao

IPC分类号： G02B510

摘要： An optical apparatus for producing chromatic dispersion. The apparatus includes a virtually imaged phased array (VIPA) generator, a mirror and a lens. The VIPA generator receives an input light at a respective wavelength and produces a corresponding collimated output light traveling from the VIPA generator in a direction determined by the wavelength of the input light, the output light thereby being spatially distinguishable from an output light produced for an input light at a different wavelength. The mirror has a cone shape, or a modified cone shape. The lens focuses the output light traveling from the VIPA generator onto the mirror so that the mirror reflects the output light. The reflected light is directed by the lens back to the VIPA generator. In this manner, the apparatus provides chromatic dispersion to the input light. The modified cone shape of the mirror can be designed so that the apparatus provides a uniform chromatic dispersion to light in the same channel of a wavelength division multiplexed light. The mirror can be moved in a direction perpendicular to an angular dispersion direction of the VIPA generator, to change the amount of chromatic dispersion provided to the input light.

公开(公告)号：US06317526B1

公开(公告)日：2001-11-13

申请号：US09216984

申请日：1998-12-21

申请人： Masataka Shirasaki ,  Simon Cao

发明人： Masataka Shirasaki ,  Simon Cao

IPC分类号： G02F1035

CPC分类号： G02F1/2252 ,  G02F1/0147

摘要： A heater coats an optical fiber. In addition, an apparatus, such as an optical switch, a Mach-Zehnder interferometer, or a Michelson interferometer, includes optical fibers transmitting light in optical paths, and 3-dB couplers, coupled to the optical fibers, splitting input light into the optical paths, and recombining output light into output paths. The apparatus also includes the heater coating a portion of one of the optical fibers and heating the one of the optical fibers to change the optical phase of the light traveling in the one of the optical paths. A second heater coats a portion of another of the optical fibers and heats the another of the optical fibers to change the relative optical phase of the light traveling in the one of the optical paths and the another of the optical paths. A detector is coupled to one of the optical paths and detects power of leaked light in the optical path and a heater controller is coupled to the detector and to the heater, and controls the heater based upon the power of the leaked light.

摘要翻译： 加热器涂覆光纤。 另外，诸如光开关，马赫曾德尔干涉仪或迈克尔逊干涉仪之类的装置包括在光路中传输光的光纤和耦合到光纤的3-dB耦合器，将输入光分成光学 路径，并将输出光重新组合成输出路径。 该设备还包括加热器涂覆光纤中的一个的一部分并加热光纤中的一个以改变在一个光路中行进的光的光学相位。 第二加热器涂覆另一个光纤的一部分并加热另一个光纤以改变在光路中的另一个光路中行进的光的相对光学相位。 检测器耦合到光路之一并且检测光路中的泄漏光的功率，并且加热器控制器耦合到检测器和加热器，并且基于泄漏的光的功率来控制加热器。

公开(公告)号：US06185040B2

公开(公告)日：2001-02-06

申请号：US09352660

申请日：1999-07-07

申请人： Masataka Shirasaki ,  Simon Cao

发明人： Masataka Shirasaki ,  Simon Cao

IPC分类号： G02B2700

CPC分类号： G02B6/29358 ,  G02B6/29394

摘要： A virtually imaged phased array (VIPA) which receives an input light at a respective wavelength, and produces a spatially distinguishable output light in accordance with the wavelength of the input light. The VIPA has first and second surfaces. The second surface has a reflectivity which causes a portion of light incident thereon to be transmitted therethrough. The first and second surfaces are positioned so that the input light is reflected a plurality of times between the first and second surfaces to cause a plurality of lights to be transmitted through the second surface. The plurality of transmitted lights interfere with each other to produce an output light which is spatially distinguishable from an output light produced for an input light having any other wavelength within the continuous range of wavelengths. A spacer element has an approximately zero thermal expansion coefficient and maintains the relative positioning between the first and second surfaces to be constant. Preferably, the magnitude of the thermal expansion coefficient of the spacer element is less than or equal to 10−5/° C. Even more preferable, the magnitude of the thermal expansion coefficient of the spacer element is less than or equal to 10−6/° C.

摘要翻译： 实际成像的相控阵列（VIPA），其接收相应波长的输入光，并根据输入光的波长产生空间上可区分的输出光。 VIPA有第一和第二表面。 第二表面具有使入射到其上的光的一部分透射的反射率。 第一和第二表面被定位成使得输入光在第一和第二表面之间反复多次，以使多个光透过第二表面。 多个透射光彼此干涉以产生与在连续波长范围内具有任何其它波长的输入光产生的输出光在空间上可区分的输出光。 间隔元件具有近似为零的热膨胀系数，并且使第一和第二表面之间的相对定位保持恒定。 优选地，间隔元件的热膨胀系数的大小小于或等于10-5 /℃。甚至更优选的是，间隔元件的热膨胀系数的大小小于或等于10-6 /C。

公开(公告)号：US6144494A

公开(公告)日：2000-11-07

申请号：US140638

申请日：1998-08-26

申请人： Masataka Shirasaki ,  Simon Cao

发明人： Masataka Shirasaki ,  Simon Cao

IPC分类号： G02B6/34 ,  G02B26/06 ,  G02B27/00 ,  G02B27/10 ,  H04B10/18 ,  G02B5/04

CPC分类号： G02B6/29358 ,  G02B26/06 ,  G02B27/0025 ,  G02B27/106 ,  G02B27/144 ,  G02B27/145 ,  G02B6/29392 ,  H04B10/25133

摘要： A virtually imaged phased array (VIPA) which receives an input light at a respective wavelength, and produces a spatially distinguishable output light in accordance with the wavelength of the input light. The VIPA has first and second surfaces. The second surface has a reflectivity which causes a portion of light incident thereon to be transmitted therethrough. The first and second surfaces are positioned so that the input light is reflected a plurality of times between the first and second surfaces to cause a plurality of lights to be transmitted through the second surface. The plurality of transmitted lights interfere with each other to produce an output light which is spatially distinguishable from an output light produced for an input light having any other wavelength within the continuous range of wavelengths. A spacer element has an approximately zero thermal expansion coefficient and maintains the relative positioning between the first and second surfaces to be constant. Moreover, an adjusting element is positioned between the first and second surfaces and is adjustable to change the optical distance between the first and second surfaces.

摘要翻译： 实际成像的相控阵列（VIPA），其接收相应波长的输入光，并根据输入光的波长产生空间上可区分的输出光。 VIPA有第一和第二表面。 第二表面具有使入射到其上的光的一部分透射的反射率。 第一和第二表面被定位成使得输入光在第一和第二表面之间反复多次，以使多个光透过第二表面。 多个透射光彼此干涉以产生与在连续波长范围内具有任何其它波长的输入光产生的输出光在空间上可区分的输出光。 间隔元件具有近似为零的热膨胀系数，并且使第一和第二表面之间的相对定位保持恒定。 此外，调节元件位于第一和第二表面之间，并且是可调节的，以改变第一和第二表面之间的光学距离。

公开(公告)号：US5073331A

公开(公告)日：1991-12-17

申请号：US340010

申请日：1989-04-13

申请人： Masataka Shirasaki

发明人： Masataka Shirasaki

IPC分类号： H01S5/0683 ,  H04B10/50 ,  H04L27/12 ,  H04L27/20

CPC分类号： H04B10/50 ,  H04L27/12 ,  H04L27/2096 ,  H01S5/0683 ,  H01S5/06832

摘要： A method of modulating a semiconductor laser, a method of stabilizing a self-homodyne optical interferometer and a light modulation apparatus using a semiconductor laser is provided for use, for example, in various optical communication systems. To avoid the adverse affect on a semiconductor laser of wavelength chirping and to facilitate high-speed direct modulation, a predetermined short pulse current is superimposed on a bias current to drive a semiconductor laser, thereby phase-modulating the output light at a high speed, eliminating the phase deviation at the output of the light interferometer of the self-homodyne-type and achieving a stable output from the semiconductor laser. The average intensity of the output light is obtained, thereby applying a feedback to a wavelength of the input light or to a difference in an optical path length of the optical interferometer itself in accordance with the average intensity of the output light in order to correct the phase bias when modulating the intensity. To perform a high-speed stable phase intensity modulation, transmission data is subject to sign conversion in accordance with a predetermined rule and thereafter is subject to differentiation. The differentiated signal is superimposed on a constant bias current as a modulating current pulse to drive a semiconductor laser, and the output thereof is intensity-modulated through the self-homodyne optical interferometer.

摘要翻译： PCT No.PCT / JP89 / 00220 Sec。 371日期：1989年4月13日 102（e）日期1989年4月13日PCT 1989年3月2日PCT公布。 出版物WO89 / 08356 日期：1989年9月8日。提供了一种半导体激光器的调制方法，使用半导体激光器的自平差光学干涉仪的稳定化方法和光调制装置，例如用于各种光通信系统中。 为了避免对波长啁啾的半导体激光器的不利影响并且促进高速直接调制，将预定的短脉冲电流叠加在偏置电流上以驱动半导体激光器，从而以高速相位调制输出光， 消除了自平差型的光干涉仪的输出处的相位偏差，并实现了半导体激光器的稳定输出。 获得输出光的平均强度，从而根据输出光的平均强度对输入光的波长或光干涉仪本身的光程长度的差进行反馈，以便校正 调制强度时的相位偏差。 为了执行高速稳定的相位强度调制，根据预定规则对发送数据进行符号转换，然后进行差分化。 微分信号作为调制电流脉冲叠加在恒定偏置电流上以驱动半导体激光器，并且其输出通过自 - 零差光学干涉仪进行强度调制。

公开(公告)号：US20060210283A1

公开(公告)日：2006-09-21

申请号：US11162683

申请日：2005-09-19

申请人： Masataka Shirasaki

发明人： Masataka Shirasaki

IPC分类号： H04B10/04 ,  H04B10/12

CPC分类号： H04B10/5051 ,  H04B10/505 ,  H04B10/5053 ,  H04B10/508

摘要： Transmitters for generating inversely dispersed optical signals to counter chromatic dispersion in optical fibers carrying the optical signals are presented. The transmitters have optical pulse generators which generate in parallel inversely dispersed optical pulses which are combined for output into an optical fiber. Different designs with simple modulators can be used for the optical pulse generator

摘要翻译： 提出了用于产生反向分散的光信号以反映携带光信号的光纤中的色散的发射机。 发射机具有光脉冲发生器，其产生并联的反分散光脉冲，其被组合以输出到光纤中。 具有简单调制器的不同设计可用于光脉冲发生器

公开(公告)号：US06781758B2

公开(公告)日：2004-08-24

申请号：US10459555

申请日：2003-06-12

申请人： Masataka Shirasaki ,  Simon Cao

发明人： Masataka Shirasaki ,  Simon Cao

IPC分类号： G02B528

CPC分类号： G02B27/144 ,  G02B6/29311 ,  G02B6/29358 ,  G02B6/29361 ,  G02B6/29392 ,  G02B6/29394 ,  G02B6/29395 ,  G02B27/0087 ,  G02B27/1006 ,  G02B27/106 ,  G02B27/1073 ,  G02B27/1086 ,  G02B27/126 ,  G02B27/145 ,  G02B27/148 ,  G02B27/52 ,  H04B10/25133

摘要： An optical apparatus for producing chromatic dispersion. The apparatus includes a virtually imaged phased array (VIPA) generator, a mirror and a lens. The VIPA generator receives an input light at a respective wavelength and produces a corresponding collimated output light traveling from the VIPA generator in a direction determined by the wavelength of the input light, the output light thereby being spatially distinguishable from an output light produced for an input light at a different wavelength. The mirror has a cone shape, or a modified cone shape. The lens focuses the output light traveling from the VIPA generator onto the mirror so that the mirror reflects the output light. The reflected light is directed by the lens back to the VIPA generator. In this manner, the apparatus provides chromatic dispersion to the input light. The modified cone shape of the mirror can be designed so that the apparatus provides a uniform chromatic dispersion to light in the same channel of a wavelength division multiplexed light. The mirror can be moved in a direction perpendicular to an angular dispersion direction of the VIPA generator, to change the amount of chromatic dispersion provided to the input light.

摘要翻译： 一种用于产生色散的光学装置。 该装置包括虚拟成像的相控阵（VIPA）发生器，反射镜和透镜。 VIPA发生器接收相应波长的输入光，并产生从VIPA发生器沿由输入光的波长确定的方向行进的对准的准直输出光，从而与输入光产生的输出光在空间上区别开 在不同波长的光。 镜子有一个锥形或一个改锥形。 透镜将从VIPA发生器传播的输出光聚焦到镜子上，使镜子反射出输出光。 反射光被透镜引导回到VIPA发生器。 以这种方式，该装置向输入光提供色散。 反射镜的修改锥形可以被设计成使得该装置对波分复用光的相同通道中的光提供均匀的色散。 反射镜可以在与VIPA发生器的角度分散方向垂直的方向上移动，以改变提供给输入光的色散量。