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    • 1. 发明授权
    • Dual-mode cellular telephone system
    • 双模蜂窝电话系统
    • US6035213A
    • 2000-03-07
    • US868993
    • 1997-06-04
    • Masamori TokudaMasao MiyazakiTakeshi Okamoto
    • Masamori TokudaMasao MiyazakiTakeshi Okamoto
    • H04J13/00H04B1/10H04Q7/32H04B1/38
    • H04B1/71H04B1/1036H04B1/7101H04B1/7102H04B2001/1063
    • A dual-mode cellular telephone system which is capable of suppressing a narrow-band disturbing signal appearing in a mobile station of a dual-mode cellular telephone system adapted for both an analog system and a digital CDMA system. A CDMA signal from a CDMA base station, and a narrow-band signal from an analog system are received through an antenna by a receiver, whereby they are amplified, subjected to frequency conversion, and input to a variable notch filter. A disturbing signal detection circuit supplies the variable notch filter with a control signal for varying its frequency. Namely, the disturbing signal detection circuit detects a case that an output level of the variable notch filter is at a minimum by changing the notch frequency via a series of sweeping control signals. A control signal at which the output level of the variable notch filter is at a minimum is then fed to the variable notch filter, thereby effectively suppressing any intermodulation distortions present in the mobile station.
    • 一种双模式蜂窝电话系统,其能够抑制适用于模拟系统和数字CDMA系统的双模蜂窝电话系统的移动台中出现的窄带干扰信号。 来自CDMA基站的CDMA信号和来自模拟系统的窄带信号由接收机通过天线接收,由此被放大,进行频率转换并输入到可变陷波滤波器。 干扰信号检测电路为可变陷波滤波器提供用于改变其频率的控制信号。 也就是说,干扰信号检测电路通过一系列扫频控制信号来改变陷波频率来检测可变陷波滤波器的输出电平最小的情况。 可变陷波滤波器的输出电平处于最小的控制信号然后被馈送到可变陷波滤波器,从而有效地抑制移动台中存在的任何互调失真。
    • 4. 发明授权
    • Polarization multiplexing optical receiving device and polarization multiplexing optical receiving method
    • 偏振复用光接收装置和偏振复用光接收方法
    • US09020366B2
    • 2015-04-28
    • US13977937
    • 2012-01-20
    • Takeshi Okamoto
    • Takeshi Okamoto
    • H04B10/06H04B10/60G02F1/015H04B10/67H04J14/06G02B27/28H04J14/02
    • H04B10/60G02B27/283G02F1/015H04B10/2572H04B10/671H04J14/0221H04J14/06
    • Provided are a polarization multiplexing optical receiving device and a polarization multiplexing optical receiving method with which a mismatch of optical intensity between polarized signals accumulated in an optical transmission path of an optical receiving system can be compensated with high precision, and a high-quality polarized optical signal can be received.A polarization multiplexing optical receiving device according to the present invention includes: a semiconductor optical element for adjusting the optical signal intensity of each of a TE mode and a TM mode of a polarization-multiplexed optical signal; a polarization beam splitter for spectrally separating the polarization-multiplexed optical signal into the TE mode optical signal and the TM mode optical signal; and a control circuit for calculating the optical intensity ratio between the TE mode optical signal and the TM mode optical signal, which have had the optical signal intensity thereof adjusted by the semiconductor optical element and which have been spectrally separated by the polarization beam splitter, and for performing feedback control of the semiconductor optical element so that the calculated optical intensity ratio reaches a desired value.
    • 提供了一种偏振复用光接收装置和偏振复用光接收方法,其中可以高精度地补偿在光接收系统的光传输路径中积聚的极化信号之间的光强度的不匹配,以及高质量偏振光学 可以接收信号。 根据本发明的偏振复用光接收装置包括:半导体光学元件,用于调节偏振复用光信号的TE模式和TM模式中的每一个的光信号强度; 用于将偏振复用光信号频谱分离成TE模式光信号和TM模式光信号的偏振分束器; 以及控制电路,用于计算TE模光信号和TM模光信号之间的光强度比,其光信号强度由半导体光学元件调节并且由偏振分束器进行光谱分离;以及 用于执行半导体光学元件的反馈控制,使得计算的光学强度比达到期望值。
    • 9. 发明授权
    • Wavelength tunable laser device, optical module, and method of controlling wavelength tunable laser
    • 波长可调激光器件,光学模块以及波长可调激光器的控制方法
    • US08767781B2
    • 2014-07-01
    • US13503362
    • 2010-08-18
    • Takeshi OkamotoKenji Sato
    • Takeshi OkamotoKenji Sato
    • H01S3/04H01S3/10
    • H01S5/0687H01S5/02415H01S5/06256
    • Provided is a power saving and highly reliable wavelength tunable laser device.A wavelength tunable laser device 10 of the present invention includes: a wavelength tunable laser 11 including: a laser resonator including a light source 111 and wavelength tunable mechanisms 112 and 113; and light loss control units 114a and 114b; a temperature detecting element 12 detecting a temperature of the wavelength tunable laser 11; and a controller 13, wherein the controller 13 obtains temperature information a of the wavelength tunable laser 11 from the temperature detecting element 12, calculates wavelength tunable control parameters d and e and light loss control parameters b1 and b2 based on the temperature information a, controls the wavelength tunable mechanisms 112 and 113 based on the wavelength tunable control parameters d and e, and controls light loss control units 114a and 114b based on the light loss control parameters b1 and b2.
    • 提供省电且高度可靠的波长可调激光器件。 本发明的波长可调激光装置10包括:波长可调激光器11,包括:包括光源111和波长可调谐机构112和113的激光谐振器; 和光损失控制单元114a和114b; 检测波长可调激光器11的温度的温度检测元件12; 以及控制器13,其中控制器13从温度检测元件12获得波长可调激光器11的温度信息a,基于温度信息a计算波长可调控制参数d和e以及光损失控制参数b1和b2,控制 基于波长可调控制参数d和e的波长可调机构112和113,并且基于光损失控制参数b1和b2控制光损失控制单元114a和114b。
    • 10. 发明授权
    • Optical joint
    • 光学接头
    • US08433164B2
    • 2013-04-30
    • US13119255
    • 2009-10-08
    • Takeshi OkamotoKenji SatoTomoaki KatoKenji Mizutani
    • Takeshi OkamotoKenji SatoTomoaki KatoKenji Mizutani
    • G02B6/26
    • H01S5/026G02B6/125G02B6/2813H01S5/50
    • An optical joint (1) includes a 2×2 MMI coupler (30) and a 2×2 MMI coupler (31) joined to the 2×2 MMI coupler (30). The 2×2 MMI coupler (30) includes a port (32) and a port (33) at one side. The 2×2 MMI coupler (31) includes a port (34) and a port (35) at one side. A light-absorbing region (20) is connected to the port (33), and a light-absorbing region (second light-absorbing section) (21) is connected to the port (34). A reflecting boundary (22) that reflects light propagated through the 2×2 MMI coupler (30) or the 2×2 MMI coupler (31) is formed at the junction portion between the 2×2 MMI coupler (30) and the 2×2 MMI coupler (31).
    • 光接头(1)包括2×2MMI耦合器(30)和2×2MMI耦合器(31),其连接到2×2MMI耦合器(30)。 2×2 MMI联接器(30)在一侧包括端口(32)和端口(33)。 2×2MMI耦合器(31)在一侧包括端口(34)和端口(35)。 吸收区域(20)连接到端口(33),并且光吸收区域(第二光吸收部分)(21)连接到端口(34)。 在2×2 MMI耦合器(30)与2×2 MMI耦合器(30)之间的接合部分处形成反射通过2×2MMI耦合器(30)或2×2MMI耦合器(31)传播的光的反射边界(22) 2 MMI耦合器(31)。