公开(公告)号：US20020123851A1

公开(公告)日：2002-09-05

申请号：US09933769

申请日：2001-08-22

申请人： Fujitsu Limited

发明人： Takashi Kurooka ,  Hisaya Sakamoto ,  Akimitsu Miyazaki ,  Tomoyuki Otsuka

IPC分类号： G01R013/00 ,  G06F019/00 ,  G01R029/26

CPC分类号： H04B10/2513 ,  H04B2210/252

摘要： In a receiving apparatus, there are included a compensation characteristic variable type waveform degradation compensating unit capable of compensating for waveform degradation of a received signal stemming from a transmission line, a received waveform measuring unit for measuring waveform data on the received signal (which will be referred to hereinafter as nullreceived waveform data), and a control unit for controlling a compensation characteristic of the waveform degradation compensating unit to minimize a difference between frequency data on the received signal, obtained by converting the received waveform data acquired by the received waveform measuring unit into a frequency domain, and frequency data on a reference waveform free from waveform degradation. With this configuration, certain compensation for the waveform degradation of the received signal stemming from chromatic dispersion or the like becomes feasible without using a dispersion compensation fiber.

摘要翻译： 在接收装置中，包括能够补偿来自传输线的接收信号的波形劣化的补偿特性可变型波形劣化补偿单元，接收波形测量单元，用于测量接收信号的波形数据（将是 以下称为“接收波形数据”）以及控制单元，用于控制波形劣化补偿单元的补偿特性，以最小化通过将接收到的波形测量获得的接收波形数据进行转换而获得的接收信号的频率数据之间的差异 单位变为频域，并且在没有波形劣化的参考波形上的频率数据，通过这种配置，在不使用色散补偿光纤的情况下，可以对由色散等产生的接收信号的波形劣化进行一定的补偿。

公开(公告)号：US20020126367A1

公开(公告)日：2002-09-12

申请号：US09983184

申请日：2001-10-23

申请人： FUJITSU LIMITED

发明人： Hiroshi Kuwahara ,  Norio Nagase ,  Setsuo Misaizu ,  Tetsuya Kiyonaga ,  Tomoyuki Otsuka ,  Motoyoshi Sekiya

IPC分类号： G02F001/01 ,  G02B026/00

CPC分类号： H01S5/0687 ,  H01S3/1317 ,  H01S5/06804 ,  H04B10/506 ,  H04B10/572 ,  H04J14/02

摘要： The optical transmission apparatus for multiple wavelengths according to the present invention comprises; a light source, a temperature control section for controlling the temperature of the light source, a temperature control (ATC) loop for controlling the operation of the temperature control section, and a wavelength control (AFC) loop. The ATC loop detects the temperature of the light source and feedback controls the operation of the temperature control section, so that the optical output wavelengths of the light source fall within a wavelength capture range corresponding to a target wavelength of the AFC loop. The AFC loop has a wavelength detection filter having a periodic transmission wavelength characteristic. After the operation of the ATC loop has stabilized, a wavelength capture operation is commenced, and the operation of the temperature control section is controlled so that the optical output wavelength of the light source is captured at a stable point corresponding to a target wavelength, among a plurality of stable points.

公开(公告)号：US20020018283A1

公开(公告)日：2002-02-14

申请号：US09768696

申请日：2001-01-24

申请人： FUJITSU LIMITED

发明人： Akihiko Hayashi ,  Shinichiro Sano ,  Norio Nagase ,  Tomoyuki Otsuka

IPC分类号： G02F001/01 ,  G02F001/09

CPC分类号： G02F1/0123 ,  G02F2201/58

摘要： The invention relates to a modulation controlling circuit for supplying a modulating signal to an external modulator that outputs a modulated optical signal, while setting a proper operating point in the external modulator. The external modulator that operates in cooperation with the modulation controlling circuit of the invention enables high-quality modulation at a wide bit rate range. Therefore, in an optical transmission system or a measuring instrument to which the invention is applied, the characteristics and the performance are improved and the operation is made stable without loss of advantages of the external modulator.

摘要翻译： 本发明涉及一种用于向外部调制器提供调制信号的调制控制电路，该外部调制器输出调制的光信号，同时在外部调制器中设置适当的工作点。 与本发明的调制控制电路配合工作的外部调制器能够实现宽比特率范围的高质量调制。 因此，在应用本发明的光传输系统或测量仪器中，提高了特性和性能，并且在不损失外部调制器的优点的情况下使操作稳定。