公开(公告)号：US20090123160A1

公开(公告)日：2009-05-14

申请号：US12349914

申请日：2009-01-07

申请人： Yusuke YAJIMA ,  Tohru KAZAWA ,  Yoshihiro ASHI

发明人： Yusuke YAJIMA ,  Tohru KAZAWA ,  Yoshihiro ASHI

IPC分类号： H04L7/00 ,  H04L27/06 ,  H04B10/00

CPC分类号： H04L7/0337 ,  H03L7/0814 ,  H03L7/087 ,  H03L7/091 ,  H04L7/0004 ,  H04L7/046

摘要： A bit synchronization circuit comprising an initial phase determining unit for rapidly determining, during a period of receiving a preamble of burst data, a clock with a phase synchronized with received burst data from among multi-phase clocks having the same frequency as an internal reference clock and a phase tracking unit for modifying the synchronized phase clock responsive to phase variation of received data during a period of receiving a payload of burst data by taking the synchronized phase clock determined by the initial phase determining unit as an initial phase. The bit synchronization circuit retimes burst data with a data retiming clock having a predetermined phase relation with the synchronized phase clock and outputs the burst data in synchronization with the internal reference clock.

摘要翻译： 一种位同步电路，包括初始相位确定单元，用于在从脉冲串数据的前导码接收周期内快速确定具有与内部参考时钟相同频率的多相位时钟中的接收脉冲串数据同步的时钟 以及相位跟踪单元，用于通过将由初始相位确定单元确定的同步相位时钟作为初始相位，在接收到突发数据的有效载荷的周期期间响应于接收数据的相位变化来修正同步相位时钟。 位同步电路使用具有与同步相位时钟具有预定相位关系的数据重新定时时钟重新匹配突发数据，并且与内部参考时钟同步输出脉冲串数据。

公开(公告)号：US20090214211A1

公开(公告)日：2009-08-27

申请号：US12434959

申请日：2009-05-04

申请人： Tohru KAZAWA ,  Masaki OHIRA ,  Yusuke YAJIMA ,  Akihiko TSUCHIYA ,  Yoshinobu MORITA

发明人： Tohru KAZAWA ,  Masaki OHIRA ,  Yusuke YAJIMA ,  Akihiko TSUCHIYA ,  Yoshinobu MORITA

IPC分类号： H04J14/00

CPC分类号： H04B10/272 ,  H04J3/0682 ,  H04J3/1694

摘要： In a light reception element such as an APD (Avalanche Photo Diode) used for receiving a high-speed and weak optical signal, it is possible to prevent the phenomenon of distortion of a signal inputted after a large-level light is received. A PON (Passive Optical Network) system includes an OLT (Optical Line Terminal) which can impartially and effectively transmit light reception data to each ONU (Optical Network Unit). According to a light reception amplitude received by each ONU, an inter-frame gap of an appropriate length is assigned for each ONU. The OLT includes a unit for measuring and accumulating the reception light amplitude and data on the inter-frame gap of an appropriate length decided in advance according to the characteristic of the light reception device and generates a grant value for assuring an inter-frame gap of an appropriate length by using the both information.

摘要翻译： 在用于接收高速和弱光信号的APD（雪崩光电二极管）等光接收元件中，可以防止在接收到大电平光之后输入的信号的失真现象。 PON（Passive Optical Network，无源光网络）系统包括能够向每个ONU（Optical Network Unit，光网络单元）公正地有效地发送光接收数据的OLT（Optical Line Terminal）。 根据每个ONU接收的光接收幅度，为每个ONU分配适当长度的帧间间隔。 OLT包括用于根据光接收装置的特性预先确定的适当长度的帧间隙上的接收光幅度和数据的测量和累加单元，并生成用于确保帧间间隔的帧间间隔的准许值 通过使用这两个信息适当的长度。