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    • 42. 发明授权
    • Optical amplifier and optical monitor circuit
    • 光放大器和光电监控电路
    • US07688498B2
    • 2010-03-30
    • US10998064
    • 2004-11-29
    • Miki OnakaEtsuko HayashiHiroshi Onaka
    • Miki OnakaEtsuko HayashiHiroshi Onaka
    • H01S3/00
    • H04B10/2941H01S3/06754H01S3/1305H04B10/071H04B10/07955
    • An optical amplifier of the present invention comprises: an optical amplifying circuit which amplifies a signal light; an optical reflection medium which is disposed on an optical fiber connected to the optical amplifying circuit and is capable of reflecting a noise light which exists in a predetermined wavelength range outside a signal band, among noise lights generated in said optical amplifying circuit, to radiate the reflected noise light to the outside of a core of the optical fiber; a light receiver which receives the noise light reflected to be radiated to the outside of the core of the optical fiber by the optical reflection medium, to detect the power of the noise light; and a computation circuit which computes the total power of the noise lights generated in the optical amplifying circuit based on the detection result of the light receiver. Thus, it is possible to provide at a low cost an optical amplifier provided with a monitoring function capable of detecting high accurately, with a simple optical circuit configuration, the noise light power and the like generated when the signal light is amplified.
    • 本发明的光放大器包括:放大信号光的光放大电路; 光反射介质,其设置在与光放大电路连接的光纤上,并且能够反射存在于信号频带外的预定波长范围内的噪声光,在所述光放大电路中产生的噪声光中, 将反射的噪声光反射到光纤的核心的外部; 光接收器,其通过光反射介质接收被辐射到光纤的芯的外部的噪声光,以检测噪声光的功率; 以及计算电路,其基于所述光接收器的检测结果来计算在所述光放大电路中产生的噪声光的总功率。 因此,可以以低成本提供具有能够以简单的光电路结构高精度检测的监视功能的光放大器,当信号光被放大时产生的噪声光功率等。
    • 43. 发明授权
    • Optical waveform shaper
    • 光波形整形器
    • US07631378B2
    • 2009-12-15
    • US11094642
    • 2005-03-31
    • Kazuo HironishiTakeshi HoshidaHiroshi Onaka
    • Kazuo HironishiTakeshi HoshidaHiroshi Onaka
    • G01B9/02
    • H04B10/299G02F1/3501G02F1/3517G02F1/3519G02F2001/212G02F2201/16G02F2203/26
    • The present invention is an optical waveform shaper that utilizes a plurality of interferometers. Each interferometer has one of two types of transfer functions. One type is a first transfer function characterized as having a positive second order derivative of the output optical power in respect to the input optical power. Another type is a second transfer function characterized as having a negative second order derivative of the output optical power in respect to the input optical power. The characteristics of both the first transfer function and the second transfer function are actualized when the input optical power is in the neighborhood of zero and the output optical power shows substantially periodic change with respect to the input optical power. At least one of the plurality of interferometers uses the second transfer function.
    • 本发明是利用多个干涉仪的光学波形整形器。 每个干涉仪都有两种传递函数之一。 一种类型是第一传递函数,其特征在于相对于输入光功率具有输出光功率的正二阶导数。 另一种类型是第二传递函数,其特征在于相对于输入光功率具有输出光功率的负二阶导数。 当输入光功率在零附近时,实现第一传递函数和第二传递函数的特性,并且输出光功率相对于输入光功率显示出周期性的周期性变化。 多个干涉仪中的至少一个使用第二传递函数。
    • 44. 发明授权
    • Optical receiver and optical receiving method corresponding to differential M-phase shift keying system
    • 对应于差分M相移键控系统的光接收机和光接收方式
    • US07606504B2
    • 2009-10-20
    • US11397690
    • 2006-04-05
    • Hiroshi OnakaTakeshi Hoshida
    • Hiroshi OnakaTakeshi Hoshida
    • H04B10/06G02F2/00
    • H04L27/223H04B10/60H04L27/2331
    • An optical receiver comprises branching units for branching and supplying the signal lights to be inputted to the first to fourth optical waveguides provided on a substrate, second to third optical waveguides for giving delay time differences corresponding to a symbol of the DMPSK modulated signal, a demodulating unit for demodulating two light signals through interference of signal lights between the first to second optical waveguides and between the third to fourth optical waveguides, two optical detectors for converting two light signals from the demodulating unit, and a light path length varying unit for identically varying each light path length of two optical waveguides being arranged through selection of combinations of the first and third optical waveguides, the first and fourth optical waveguides, and the second and third optical waveguides in one region when the wavelength of the signal light is varied.
    • 光接收机包括分支单元,用于分支和提供要输入到设置在基板上的第一至第四光波导的信号光;第二至第三光波导,用于给出对应于DMPSK调制信号的符号的延迟时间差;解调 用于通过第一至第二光波导之间和第三至第四光波导之间的信号光的干扰来解调两个光信号的单元,用于转换来自解调单元的两个光信号的两个光检测器,以及用于相同变化的光路长度变化单元 当信号光的波长变化时,两个光波导的每个光路长度通过选择第一和第三光波导,第一和第四光波导以及一个区域中的第二和第三光波导的组合来布置。
    • 46. 发明申请
    • Encryption method, cryptogram decoding method, encryptor, cryptogram decoder, and communication system
    • 加密方法,密码解码方式,加密方式,密码解码方式和通信方式
    • US20070183593A1
    • 2007-08-09
    • US11439367
    • 2006-05-24
    • Setsuo YoshidaOsamu HirotaHiroshi Onaka
    • Setsuo YoshidaOsamu HirotaHiroshi Onaka
    • H04L9/28H04L9/00
    • H04L9/0852H04L9/0662H04L9/0891H04L2209/08
    • An encryption technique having a greater encryption strength than conventional mathematical encryption by using classic physical random numbers etc., including a step for modulating one-bit input data into a coded signal by associating it with a discrete value of at least two bits determined by pseudo random numbers and physical random numbers and a step for channel-coding and outputting the coded signal, wherein 1) the coded signal can be demodulated into the input data by the pseudo random number, 2) the number of sets of input data, pseudo random number, and physical random number corresponding to a particular discrete value is equal for two values of the input data, and 3) the number of sets of pseudo random number and physical random number corresponding to respective values of the input data and respective values of the discrete value is equally associated also with any set of them.
    • 一种通过使用经典的物理随机数等具有比常规数学加密更大的加密强度的加密技术,包括通过将一位输入数据与由伪伪确定的至少两个比特的离散值相关联来将一位输入数据调制成编码信号的步骤 随机数和物理随机数,以及用于信道编码和输出编码信号的步骤,其中1)编码信号可以通过伪随机数解调为输入数据,2)输入数据集合的数目,伪随机数 对应于特定离散值的数量和物理随机数对于输入数据的两个值是相等的,以及3)与输入数据的各个值对应的伪随机数和物理随机数的集合的数量以及相应的值 离散值也与它们的任意集合相同。