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    SEMICONDUCTOR INTEGRATED OPTICS ELEMENT AND PRODUCTION METHOD THEREFOR
    4.
    发明公开
    SEMICONDUCTOR INTEGRATED OPTICS ELEMENT AND PRODUCTION METHOD THEREFOR 审中-公开

    公开(公告)号：EP3764488A1

    公开(公告)日：2021-01-13

    申请号：EP19763524.6

    申请日：2019-02-28

    申请人： NIPPON TELEGRAPH AND TELEPHONE CORPORATION

    发明人： SHINDO, Takahiko ,  FUJIWARA, Naoki ,  SANO, Kimikazu ,  ISHII, Hiroyuki ,  MATSUZAKI, Hideaki ,  YAMADA, Takashi ,  HORIKOSHI, Kengo

    IPC分类号： H01S5/042 ,  H01S5/026 ,  H01S5/12 ,  H01S5/227 ,  H01S5/50

    摘要： A semiconductor optical integrated element (AXEL) designed to output further intensified light dispenses with an additional inspection process and prevents an increase in manufacturing costs. A method for manufacturing such a semiconductor optical integrated element, includes the step of forming a semiconductor wafer by arranging a plurality of the semiconductor optical integrated elements two-dimensionally such that optical axes of the semiconductor optical integrated elements are aligned. The semiconductor optical integrated elements each include a DFB laser, an EA modulator, and a SOA that are monolithically integrated on an identical substrate and that are disposed in an order of the DFB laser, the EA modulator, and the SOA along a light emitting direction. The method further includes the steps of cleaving the semiconductor wafer along a plane orthogonal to the light emitting direction to form a semiconductor bar including a plurality of the semiconductor optical integrated elements arranged one-dimensionally along a direction orthogonal to the light emitting direction such that the semiconductor optical integrated elements adjacent to each other share an identical cleavage end face as a light emission surface, inspecting each of the semiconductor optical integrated elements of the semiconductor bar by energizing and driving the SOA and the DFB laser through a connection wiring part that electrically connects an electrode of the SOA and an electrode of the DFB laser together, and separating out each of the semiconductor optical integrated elements of the semiconductor bar at a boundary line between the adjacent semiconductor optical integrated elements after the inspection to cut the connection wiring part electrically connecting the electrode of the SOA and the electrode of the DFB laser and electrically isolate the SOA and the DFB laser from each other.

    WAVELENGTH DISPERSION ESTIMATION CIRCUIT, OPTICAL RECEIVER, AND WAVELENGTH DISPERSION ESTIMATION METHOD
    5.
    发明公开
    WAVELENGTH DISPERSION ESTIMATION CIRCUIT, OPTICAL RECEIVER, AND WAVELENGTH DISPERSION ESTIMATION METHOD 审中-公开
    波长色散估计电路，光学接收器和波长色散估计方法

    公开(公告)号：EP3255815A1

    公开(公告)日：2017-12-13

    申请号：EP16861870.0

    申请日：2016-10-04

    申请人： NTT Electronics Corporation ,  Nippon Telegraph and Telephone Corporation

    发明人： YAMAZAKI, Etsushi ,  TAKAMUKU, Tomohiro ,  YOSHIDA, Yuki ,  YOSHIDA, Mitsuteru ,  SHIBAHARA, Koki ,  HORIKOSHI, Kengo ,  KISAKA, Yoshiaki

    IPC分类号： H04B10/079 ,  G01M11/02 ,  H04B3/06 ,  H04B10/2513

    摘要： A Fourier-transformer (11) performs Fourier transform on a filter coefficient output from an adaptive equalizer (6) which comprises a finite impulse response filter of N taps (N represents an integer of 2 or more) in a time direction. An eigenvalue sum calculator (15) integrates a frequency-differentiation result of the Fourier-transformed filter coefficient and a complex conjugate of the Fourier-transformed filter coefficient to calculate a matrix, and calculates a sum of two eigenvalues of the matrix. A proportionality factor calculator (14) calculates a proportionality factor for frequency from the sum of the two eigenvalues.

    摘要翻译： 傅立叶变换器（11）对从自适应均衡器（6）输出的滤波器系数执行傅里叶变换，该自适应均衡器包括在时间方向上具有N个抽头（N表示2或更大的整数）的有限脉冲响应滤波器。 特征值和计算器（15）对傅立叶变换的滤波器系数的频率微分结果和傅立叶变换的滤波器系数的复共轭进行积分以计算矩阵，并且计算矩阵的两个特征值的和。 比例因子计算器（14）根据两个特征值的和来计算频率的比例因子。