公开(公告)号：US5296957A

公开(公告)日：1994-03-22

申请号：US759483

申请日：1991-09-13

申请人： Masaaki Takahashi ,  Takanori Maki ,  Kazuya Amaki ,  Katsumi Kikawa ,  Mitsushi Nitta

发明人： Masaaki Takahashi ,  Takanori Maki ,  Kazuya Amaki ,  Katsumi Kikawa ,  Mitsushi Nitta

IPC分类号： H04B10/00 ,  H04B10/02 ,  H04B10/035 ,  H04B10/077 ,  H04B10/08 ,  H04B10/17 ,  H04B10/291 ,  H04B10/293

CPC分类号： H04B10/2918 ,  H04B10/035 ,  H04B10/0777 ,  H04B10/2939 ,  H04B2210/074

摘要： An optical repeater having a loop-back function is provided in a transmission system including first and second transmission lines. The optical repeater includes a first optical amplifier connected to the first transmission line, a second optical amplifier connected to the second transmission line, a loop-back unit connected to both transmission lines, and a control unit. The control unit controls the loop-back unit to form a loop-back line when a loop-back instruction is detected. Therefore, optical signals are directly amplified without being converted into electrical signals, and a loop-back signal (return signal) and optical signals are not mixed in the optical repeater so that a loop-back operation can be correctly carried out in an optical repeater having a small size and low power consumption.

摘要翻译： 在包括第一和第二传输线的传输系统中提供具有环回功能的光中继器。 光中继器包括连接到第一传输线的第一光放大器，连接到第二传输线的第二光放大器，连接到两传输线的环回单元和控制单元。 当检测到环回指令时，控制单元控制环回单元形成回送线。 因此，光信号被直接放大而不被转换为电信号，并且环路信号（返回信号）和光信号不会混入光中继器中，从而可以在光中继器中正确执行环回操作 具有小尺寸和低功耗。

公开(公告)号：US5130837A

公开(公告)日：1992-07-14

申请号：US558432

申请日：1990-07-27

申请人： Mitsuo Kitamura ,  Katsumi Kikawa

发明人： Mitsuo Kitamura ,  Katsumi Kikawa

IPC分类号： H04B10/07 ,  H04B10/077 ,  H04B10/29

CPC分类号： H04B10/29

摘要： An optical repeater provided in an up line and a down line, the optical repeater includes a first circuit related to the up line, and a second circuit related to the down line. Each circuit includes an optical receive/decision circuit, a command extraction circuit, a command detection circuit, a command switch and a supervisory circuit. Each circuit also includes a noise component processing circuit which extracts, from the electrical signal, a noise component within a predetermined frequency range excluding a frequency of the command signal and determines whether or not the optical signal is input to the optical receive/decision circuit on the basis of the noise component and which prevents the noise component passing through the command extracting circuit from being directly applied to the command detecting circuit when it is determined that no the optical input is input to the optical receive/decision circuit. Each circuit further includes an output circuit which converts the data signal and a supervisory signal into an optical output which is transferred to a corresponding one of the up line and the down line.

公开(公告)号：US5293260A

公开(公告)日：1994-03-08

申请号：US729306

申请日：1991-07-12

申请人： Katsumi Kikawa ,  Mitsuo Kitamura

发明人： Katsumi Kikawa ,  Mitsuo Kitamura

IPC分类号： H04B3/36 ,  H04B10/03 ,  H04B10/07 ,  H04B10/077 ,  H04B10/079 ,  H04B10/29 ,  H04B10/08 ,  H04B10/02

CPC分类号： H04B10/29 ,  H04B10/077 ,  H04B10/07955

摘要： An optical repeater OFF-state supervisory method includes the steps of: converting an input optical signal into an electrical signal; monitoring a level of the input optical signal from a monitored value when converted into the electrical signal; monitoring whether an input optical signal to an optical repeater is in an OFF state or not; detecting that the input optical signal has been in an OFF state; and changing the monitored value to a predetermined fixed monitored value.

摘要翻译： 光中继器OFF状态监控方法包括以下步骤：将输入光信号转换为电信号; 当转换成电信号时，从监视值监视输入光信号的电平; 监视到光中继器的输入光信号是否处于OFF状态; 检测输入光信号是否处于关闭状态; 并将所监视的值改变为预定的固定监视值。