公开(公告)号：US08457168B2

公开(公告)日：2013-06-04

申请号：US12086287

申请日：2007-01-10

申请人： Koji Kudo ,  Shinya Sudo ,  Kenji Sato ,  Kenji Mizutani

发明人： Koji Kudo ,  Shinya Sudo ,  Kenji Sato ,  Kenji Mizutani

IPC分类号： H01S5/00

CPC分类号： H01S5/026

摘要： A semiconductor optical waveguide-A having an optical amplification function and a semiconductor optical waveguide-B having a light control function are integrated together on the same substrate. A facet of the semiconductor optical waveguide-A facing an isolation trench and a facet of the semiconductor optical waveguide-B facing the isolation trench are configured as a composite optical reflector/optical connector using an optical interference. The facet of the semiconductor optical waveguide-A achieves an optical reflectivity not higher than the reflectivity corresponding to a cleaved facet and not smaller than several percent, and an optical coupling coefficient of not lower than 50% between the semiconductor optical waveguide-A and the semiconductor optical waveguide-B.

摘要翻译： 具有光放大功能的半导体光波导A和具有光控功能的半导体光波导-B一起集成在同一基板上。 面向隔离沟槽的半导体光波导A的面和面向隔离沟槽的半导体光波导-B的面被配置为使用光学干涉的复合光反射器/光连接器。 半导体光波导A的小面实现不高于对应于切割面的反射率并且不小于几个百分比的光学反射率，并且半导体光波导A与第二半导体光波导A之间的光耦合系数不低于50％ 半导体光波导-B。

公开(公告)号：US20130113641A1

公开(公告)日：2013-05-09

申请号：US13698019

申请日：2011-04-28

申请人： Shinya Sudo ,  Kenji Sato

发明人： Shinya Sudo ,  Kenji Sato

IPC分类号： G02F1/01 ,  H03M1/12

CPC分类号： G02F1/011 ,  G02F1/225 ,  G02F1/3517 ,  G02F7/00 ,  H03M1/12 ,  Y10T29/49

摘要： An optical intensity-to-phase converter according to the present invention includes first and second waveguides to which a first input light is input, a third waveguide to which a second input light is input, and an interaction region that is provided in common on the second and third waveguides in which the first and second input lights are multiplexed and interact. The optical intensity-to-phase converter provides delay to output lights output from the first and second waveguides based on intensity of the first or second input light. Then, it is possible to provide an optical intensity-to-phase converter that enables simple configuration of an optical A/D converter.

摘要翻译： 根据本发明的光强度相变转换器包括输入第一输入光的第一波导和第二波导，输入第二输入光的第三波导和在其上共同设置的相互作用区 第二和第三波导，其中第一和第二输入光被复用和相互作用。 光强度相变转换器基于第一或第二输入光的强度向第一和第二波导输出的输出光提供延迟。 然后，可以提供能够简单配置光学A / D转换器的光学强度相变转换器。

公开(公告)号：US20120224856A1

公开(公告)日：2012-09-06

申请号：US13508721

申请日：2010-09-28

申请人： Kenji Sato ,  Shinya Sudo

发明人： Kenji Sato ,  Shinya Sudo

IPC分类号： H04J14/00

CPC分类号： H04B10/5053 ,  G02F2203/56 ,  H04B10/516

摘要： The present invention has an object to provide an optical modulation device and an optical modulation method that achieve an excellent spectral efficiency with a simple and compact configuration and low power consumption. An optical modulation device according to an exemplary aspect of the present invention includes a CW light source (11), a coupler (12), optical modulators (14a) and (14b), an optical frequency shifter (15b), a serial-to-parallel converter (21), and a delay circuit (24a). The serial-to-parallel converter (21) divides a data signal having a bit rate B into two data strings having a bit rate B/2, and extracts a clock signal (CLK). The delay circuit (24a) temporally synchronizes the two data strings. CW light emitted from the CW light source is split into two beams by the coupler (12). The optical modulators (14a) and (14b) generate optical signals by modulating the two split light beams according to the data strings. The optical frequency shifter (15b) shifts center frequencies of the optical signals by Δf=B/(2×2) according to the clock signal (CLK).

摘要翻译： 本发明的目的是提供一种光调制装置和光调制方法，其以简单紧凑的结构和低功耗实现了优异的光谱效率。 根据本发明的示例性方面的光调制装置包括CW光源（11），耦合器（12），光调制器（14a）和（14b），光移频器（15b），串 - 并联转换器（21）和延迟电路（24a）。 串行到并行转换器（21）将具有比特率B的数据信号分成具有比特率B / 2的两个数据串，并提取时钟信号（CLK）。 延迟电路（24a）在时间上同步两个数据串。 从CW光源发射的CW光被耦合器（12）分成两束。 光调制器（14a）和（14b）通过根据数据串调制两个分束光束来产生光信号。 光移位器（15b）根据时钟信号（CLK）将光信号的中心频率移位＆Dgr; f = B /（2×2）。

公开(公告)号：US07991024B2

公开(公告)日：2011-08-02

申请号：US11994085

申请日：2006-06-29

申请人： Kenji Sato ,  Jan De Merli ,  Kenji Mizutani ,  Koji Kudo ,  Shinya Sudo ,  Mads. L Nielsen

发明人： Kenji Sato ,  Jan De Merli ,  Kenji Mizutani ,  Koji Kudo ,  Shinya Sudo ,  Mads. L Nielsen

IPC分类号： H01S3/13 ,  H01S3/08

CPC分类号： H01S5/141

摘要： In an external cavity wavelength tunable laser device including an external cavity (20) which includes a semiconductor optical amplifier (2) and performs laser oscillation operation by feeding back external light, a wavelength tunable mirror (7) having at least a single-peak reflection spectrum characteristic within a laser wavelength tuning range is placed on one end of the external cavity (20), and a Fabry-Perot mode interval determined by the effective length of the external cavity (20) is not less than 1/10 times and not more than 10 times the reflection band full width half maximum of the wavelength tunable mirror (7).

摘要翻译： 在包括具有半导体光放大器（2）的外部空腔（20）并通过反馈外部光进行激光振荡操作的外腔波长可调激光器件中，具有至少单峰反射的波长可调谐镜（7） 在激光波长调谐范围内的光谱特性被放置在外腔（20）的一端，并且由外腔（20）的有效长度确定的法布里 - 珀罗模式间隔不小于1/10倍 波长可调镜（7）的反射带全宽度的最大半数的10倍以上。

公开(公告)号：US20090122817A1

公开(公告)日：2009-05-14

申请号：US12064441

申请日：2006-09-04

申请人： Kenji Sato ,  Jan De Merli ,  Kenji Mizutani ,  Shinya Sudo ,  Koji Kudo ,  Hiroyuki Yamazaki

发明人： Kenji Sato ,  Jan De Merli ,  Kenji Mizutani ,  Shinya Sudo ,  Koji Kudo ,  Hiroyuki Yamazaki

IPC分类号： H01S3/10 ,  G02B6/10

CPC分类号： G02B6/12007 ,  G02F1/313 ,  G02F2203/15 ,  G02F2203/585 ,  H01S5/02248 ,  H01S5/0687 ,  H01S5/101 ,  H01S5/1032 ,  H01S5/142

摘要： Only the light at an overlapping wavelength of the transmission characteristics of at least two wavelength selecting filters is looped, and at least one of the wavelength selecting filters varies a selected wavelength. Since a loss due to the optical filters is small and there is not a loss caused by a highly reflecting film, the output of an external-resonator variable-wavelength laser can be increased. Optical circuit component (8) divides light input from external device (1) into at least two ports. Loop waveguide (11) interconnects at least ports (9, 10) divided by optical circuit component (8) in the form of a loop. At least two first wavelength selecting filters (12, 13) are inserted in series in a path of loop waveguide (11), and have periodic transmission characteristics on a frequency axis which are different from each other. At least one of first wavelength selecting filters (12, 13) varies the selected wavelength.

摘要翻译： 只有至少两个波长选择滤波器的传输特性的重叠波长的光被环绕，并且至少一个波长选择滤波器改变选定的波长。 由于由于滤光器引起的损耗小，并且不会由高反射膜引起的损耗，所以可以增加外部谐振器可变波长激光器的输出。 光电路部件（8）将从外部设备（1）输入的光分成至少两个端口。 环形波导（11）至少以循环形式的由光电路部件（8）划分的端口（9,10）互连。 至少两个第一波长选择滤波器（12,13）串联插入到环形波导（11）的路径中，并且在频率轴上具有彼此不同的周期性传输特性。 第一波长选择滤光器（12,13）中的至少一个改变所选择的波长。

公开(公告)号：US20090141747A1

公开(公告)日：2009-06-04

申请号：US11994085

申请日：2006-06-29

申请人： Kenji Sato ,  Jan De Merli ,  Kenji Mizutani ,  Koji Kudo ,  Shinya Sudo ,  Mads L. Nielsen

发明人： Kenji Sato ,  Jan De Merli ,  Kenji Mizutani ,  Koji Kudo ,  Shinya Sudo ,  Mads L. Nielsen

IPC分类号： H01S3/10

CPC分类号： H01S5/141

摘要： In an external cavity wavelength tunable laser device including an external cavity (20) which includes a semiconductor optical amplifier (2) and performs laser oscillation operation by feeding back external light, a wavelength tunable mirror (7) having at least a single-peak reflection spectrum characteristic within a laser wavelength tuning range is placed on one end of the external cavity (20), and a Fabry-Perot mode interval determined by the effective length of the external cavity (20) is not less than 1/10 times and not more than 10 times the reflection band full width half maximum of the wavelength tunable mirror (7).

摘要翻译： 在包括具有半导体光放大器（2）的外部空腔（20）并通过反馈外部光进行激光振荡操作的外腔波长可调激光器件中，具有至少单峰反射的波长可调谐镜（7） 在激光波长调谐范围内的光谱特性被放置在外腔（20）的一端，并且由外腔（20）的有效长度确定的法布里 - 珀罗模式间隔不小于1/10倍 波长可调镜（7）的反射带全宽度的最大半数的10倍以上。

公开(公告)号：US08922410B2

公开(公告)日：2014-12-30

申请号：US13698019

申请日：2011-04-28

申请人： Shinya Sudo ,  Kenji Sato

发明人： Shinya Sudo ,  Kenji Sato

IPC分类号： H03M1/12 ,  G02F1/01 ,  G02F1/225 ,  G02F7/00

CPC分类号： G02F1/011 ,  G02F1/225 ,  G02F1/3517 ,  G02F7/00 ,  H03M1/12 ,  Y10T29/49

摘要： An optical intensity-to-phase converter according to the present invention includes first and second waveguides to which a first input light is input, a third waveguide to which a second input light is input, and an interaction region that is provided in common on the second and third waveguides in which the first and second input lights are multiplexed and interact. The optical intensity-to-phase converter provides delay to output lights output from the first and second waveguides based on intensity of the first or second input light. Then, it is possible to provide an optical intensity-to-phase converter that enables simple configuration of an optical A/D converter.

摘要翻译： 根据本发明的光强度相变转换器包括输入第一输入光的第一波导和第二波导，输入第二输入光的第三波导和在其上共同设置的相互作用区 第二和第三波导，其中第一和第二输入光被复用和相互作用。 光强度相变转换器基于第一或第二输入光的强度向第一和第二波导输出的输出光提供延迟。 然后，可以提供能够简单配置光学A / D转换器的光学强度相变转换器。

公开(公告)号：US20100111119A1

公开(公告)日：2010-05-06

申请号：US12593513

申请日：2008-02-06

申请人： Kenji Sato ,  Kenji Mizutani ,  Shinya Sudo ,  Koji Kudo

发明人： Kenji Sato ,  Kenji Mizutani ,  Shinya Sudo ,  Koji Kudo

IPC分类号： H01S5/06 ,  H01S5/14

CPC分类号： H01S5/141

摘要： In an external resonator type semiconductor wavelength tunable laser apparatus using a wavelength tunable mirror or a wavelength tunable filter which uses a refractive index change of liquid crystal, a resonant frequency is set as FR, when a response of the refractive index change to a drive voltage frequency of liquid crystal becomes maximum. A frequency F1 of a drive AC power supply voltage to control the refractive index of liquid crystal is set to a frequency largely different from FR. A wavelength tunable mirror or a wavelength tunable filter is driven with a signal in which a dither AC signal F2 of a frequency close to the FR and an AC power supply voltage are superimposed. A PD to monitor a light output from the laser controls an amplitude of the drive AC power voltage such that an amplitude of the dither AC signal F2 become minimum. Thus, high laser mode stability is realized.

摘要翻译： 在使用波长可调镜或使用液晶的折射率变化的波长可调滤波器的外部谐振器型半导体波长可调激光装置中，当折射率的响应变化为驱动电压时，共振频率被设定为FR 液晶的频率变得最大。 控制液晶的折射率的驱动交流电源电压的频率F1被设定为与FR大不相同的频率。 波长可调谐镜或波长可调滤波器由其中叠加了频率接近FR的频率抖动交流信号F2和交流电源电压的信号驱动。 用于监视来自激光器的光输出的PD控制驱动AC电源电压的幅度，使得抖动AC信号F2的幅度变得最小。 因此，实现了高激光模式的稳定性。

公开(公告)号：US20090257460A1

公开(公告)日：2009-10-15

申请号：US11995554

申请日：2006-07-13

申请人： Kenji Mizutani ,  Jan De Merli ,  Koji Kudo ,  Kenji Sato ,  Shinya Sudo

发明人： Kenji Mizutani ,  Jan De Merli ,  Koji Kudo ,  Kenji Sato ,  Shinya Sudo

IPC分类号： H01S3/10 ,  H01S3/00

CPC分类号： H01S5/141 ,  H01S5/028 ,  H01S5/0287 ,  H01S5/0625 ,  H01S5/0687 ,  H01S5/142

摘要： The reflectance of a semiconductor optical amplifier (1) on the side where an external cavity is formed is 0.1% at most. The finesse value obtained by dividing the period of the transmission characteristic of the wavelength selection filter (3) by the half value width of the transmission characteristic is 4 or more and 25 or less. Even when the reflectance of a cavity side end face (1bb) of the semiconductor optical amplifier (1) is about 0.1%, a wavelength accuracy of ±1.5 GHz can be achieved by setting the finesse to 4 or more. In addition, a wavelength accuracy of about ±0.5 GHz can be achieved by setting the finesse to 8 or more. In order to suppress insertion loss, it is preferable to set the finesse of the FP etalon to 25 or less. This makes it possible to implement an external cavity wavelength tunable laser with high wavelength accuracy.

摘要翻译： 半导体光放大器（1）在形成外部空腔的一侧的反射率最多为0.1％。 通过将波长选择滤波器（3）的传输特性的周期除以传输特性的半值宽度获得的精细度值为4以上且25以下。 即使当半导体光放大器（1）的腔侧端面（1bb）的反射率为约0.1％时，通过将精细度设定为4以上可以实现±1.5GHz的波长精度。 此外，通过将精细度设定为8以上可以实现约±0.5GHz的波长精度。 为了抑制插入损耗，优选将FP标准具的精细度设定为25以下。 这使得可以实现具有高波长精度的外部腔波长可调谐激光器。

公开(公告)号：US09052534B2

公开(公告)日：2015-06-09

申请号：US13698018

申请日：2011-04-28

申请人： Shinya Sudo ,  Kenji Sato

发明人： Shinya Sudo ,  Kenji Sato

IPC分类号： G02F2/00 ,  H03M1/00 ,  G02F7/00

CPC分类号： G02F7/00 ,  G02F2/00 ,  G02F2002/006 ,  G02F2203/50 ,  Y10T29/49826

摘要： An optical A/D converter according to the present invention includes an optical splitter that splits an analog input signal light into plurals, a plurality of Mach-Zehnder interferometers to which each of the signal lights split by the optical splitter is input, and plurality of optical/electrical conversion unit that convert each signal lights output from each Mach-Zehnder interferometer into a digital electrical signal, in which each Mach-Zehnder interferometer includes optical intensity-to-phase conversion unit that optically convert intensity of the input signal light into an amount of phase shift and the amount of phase shift differs for each Mach-Zehnder interferometer. Then, it is possible to provide a high speed and low power consuming optical demodulation circuit.

摘要翻译： 根据本发明的光学A / D转换器包括将模拟输入信号光分解为多个的光分路器，输入由光分路器分离的每个信号光的多个马赫 - 曾德干涉仪，并且多个 将每个马赫 - 策德尔干涉仪输出的每个信号光转换为数字电信号的光/电转换单元，其中每个马赫 - 策德尔干涉仪包括光学强度 - 相位转换单元，其将输入信号光的强度光学地转换成 每个Mach-Zehnder干涉仪的相移量和相移量都不同。 然后，可以提供高速，低功耗的光解调电路。