公开(公告)号：US20070274725A1

公开(公告)日：2007-11-29

申请号：US11709729

申请日：2007-02-23

申请人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro ,  Etsuko Hayashi

发明人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro ,  Etsuko Hayashi

IPC分类号： H04J14/00

CPC分类号： H04J14/0221 ,  H04B10/506 ,  H04B10/564 ,  H04J14/0204 ,  H04J14/0212 ,  H04J14/0227

摘要： In an optical transmission apparatus, optical power of each of wavelength contained in a wavelength multiplexing signal is measured, a measured value of the optical power of each wavelength is compared with a predetermined threshold value, a total value of the measured values of the optical power, which are equal to or larger than the threshold value, is calculated as a total value of signal beam power, and a total value of the measured values of the optical power, which are less then the threshold value, is calculated as a total value of ASE power. The number of the measured values of the optical power, which are equal to or larger than the threshold value, is calculated as a wavelength count of the signal beams contained in the wavelength multiplexing signal. A signal-to-ASE ratio is calculated from the total value of the signal beam power and the total value of the ASE power. The optical power of the wavelength multiplexing signal inputted to an optical amplifier is measured, and a target value of the automatic level control (ALC) is determined by use of the measured values of the wavelength count, the signal-to-ASE ratio and the optical power of the wavelength multiplexing signal in order to execute the ALC of the optical amplifier so that the optical power of each of the wavelengths in the wavelength multiplexing signal outputted from the optical amplifier, becomes constant.

摘要翻译： 在光传输装置中，测定包含在波长多路复用信号中的各波长的光功率，将各波长的光功率的测量值与预定阈值进行比较，光功率的测量值的总和 被计算为信号光束功率的总值，并且计算小于阈值的光功率的测量值的总值作为总值，其等于或大于阈值 的ASE电力。 计算出等于或大于阈值的光功率的测量值的数量作为包含在波长复用信号中的信号光束的波长计数。 从信号光束功率的总值和ASE功率的总值计算信号到ASE比。 测量输入到光放大器的波长复用信号的光功率，并且通过使用波长计数，信号与ASE比和测量值的测量值来确定自动电平控制（ALC）的目标值 为了执行光放大器的ALC，使得从光放大器输出的波长复用信号中的每个波长的光功率变得恒定，所以波长多路复用信号的光功率变得恒定。

公开(公告)号：US20080074731A1

公开(公告)日：2008-03-27

申请号：US11845335

申请日：2007-08-27

申请人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro

发明人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro

IPC分类号： H01S3/00

CPC分类号： H01S3/06758 ,  H01S3/10015 ,  H01S3/1305 ,  H01S3/2316

摘要： An optical amplifier reducing gain deviation caused by wavelength arrangement has a first-stage optical amplifying unit, an attenuator, a second-stage optical amplifying unit, an automatic gain controller controlling the first- and second-stage optical amplifying units so that a gain of signal light outputted from the second-stage optical amplifying unit to signal light inputted to the first-stage optical amplifying unit is constant, and an attenuation amount controller controlling an attenuation amount at the attenuator to adjust gain-versus-wavelength characteristic at the automatic-gain-controlled first- and second-stage optical amplifying units on the basis of information on wavelength arrangement and an input level of the signal light inputted to the first-stage optical amplifying unit so that gain slope characteristic at the first- and second-stage optical amplifying units due to the wavelength arrangement and the input level is flattened.

摘要翻译： 降低由波长配置引起的增益偏差的光放大器具有第一级光放大单元，衰减器，第二级光放大单元，控制第一级和第二级光放大单元的自动增益控制器， 从第二级光放大单元输出的信号光信号是恒定的，并且衰减量控制器控制衰减器处的衰减量，以调节自动 - 基于波长配置的信息和输入到第一级光放大单元的信号光的输入电平，使得增益控制的第一级和第二级光放大单元在第一级和第二级的增益斜率特性 由于波长布置和输入电平而导致的光放大单元变平。

公开(公告)号：US08077383B2

公开(公告)日：2011-12-13

申请号：US12053816

申请日：2008-03-24

申请人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro

发明人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro

IPC分类号： H01S3/00

CPC分类号： H01S3/06758 ,  H01S3/10015 ,  H01S3/1305 ,  H01S3/1608 ,  H01S2301/02 ,  H01S2301/04

摘要： An optical amplifier including: a first amplifying unit amplifying an input light by utilizing a first excitation light and thereby outputting a first amplified light; a second amplifying unit amplifying the first amplified light by utilizing a second excitation light and thereby outputting a second amplified light; and a control unit detecting a first absorption rate of the first excitation light and a second absorption rate of the second excitation light, and controlling a level of the first excitation light and a level of second excitation light based on the first absorption rate and the second absorption rate. The first absorption rate corresponds to a ratio of the first excitation light absorbed in the first amplifying unit, and the second absorption rate corresponds to a ratio of the second excitation light absorbed in the second amplifying unit.

摘要翻译： 一种光放大器，包括：第一放大单元，利用第一激发光放大输入光，从而输出第一放大光; 第二放大单元，利用第二激发光放大第一放大光，从而输出第二放大光; 以及控制单元，其检测所述第一激发光的第一吸收率和所述第二激发光的第二吸收率，并且基于所述第一吸收率控制所述第一激发光的电平和第二激发光的电平， 吸收率。 第一吸收率对应于第一放大单元吸收的第一激发光的比例，第二吸收率对应于第二放大单元吸收的第二激发光的比例。

公开(公告)号：US08026538B2

公开(公告)日：2011-09-27

申请号：US12285232

申请日：2008-09-30

申请人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro

发明人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro

IPC分类号： H01S3/04

CPC分类号： H01L31/102

摘要： A photo-detecting apparatus includes a photodiode that coverts light into electricity, a reverse-voltage switching unit that switches a reverse voltage to be applied to the photodiode, a current-difference detecting unit that detects a change in an output current of the photodiode occurring due to switching of the reverse voltage as a current difference, a correspondence retaining unit that retains a correspondence between the current difference and a dark current, a dark-current calculating unit that calculates a dark current by referring to the correspondence based on the current difference detected by the current-difference detecting unit, and a dark-current correcting unit that corrects the output current of the photodiode based on the dark current to find a photocurrent obtained through photoelectric conversion.

摘要翻译： 一种光电检测装置，包括：将光转换成电的光电二极管;反相电压切换单元，其切换施加到光电二极管的反向电压;电流差检测单元，检测发生的光电二极管的输出电流的变化; 由于反向电压作为电流差的切换，保持电流差和暗电流之间的对应关系的对应关系保持单元，参照基于电流差的对应关系计算暗电流的暗电流计算单元 由电流差检测单元检测，以及暗电流校正单元，其基于暗电流校正光电二极管的输出电流，以找到通过光电转换获得的光电流。

公开(公告)号：US20090297143A1

公开(公告)日：2009-12-03

申请号：US12453060

申请日：2009-04-28

申请人： Tomoaki Takeyama ,  Ichiro Nakajima ,  Keiko Sasaki ,  Shinichirou Muro ,  Etsuko Hayashi

发明人： Tomoaki Takeyama ,  Ichiro Nakajima ,  Keiko Sasaki ,  Shinichirou Muro ,  Etsuko Hayashi

IPC分类号： H04B10/08 ,  H04B10/04

CPC分类号： H04B10/07955 ,  H04J14/0221

摘要： In an optical transmission apparatus, levels of signal lights obtained by demultiplexing a WDM signal and corresponding to channels are detected, based on which a channel in which a signal is transmitted and a channel in which no signal is transmitted are determined. An attenuation amount of a channel in which no signal is transmitted in a predetermined range from the channel in which the signal is transmitted is set to a value equal to an attenuation amount of the channel in which the signal is transmitted. An attenuation amount of a channel in which no signal is transmitted out of the predetermined range from the channel in which the signal is transmitted is set to a value larger than the attenuation amount of the channel in which the signal is transmitted. The signal lights are attenuated based on the values and multiplexed.

摘要翻译： 在光传输装置中，检测通过对WDM信号进行解复用和对应于信道而获得的信号光的电平，基于该信号的信号被发送的信道和没有发送信号的信道被确定。 在发送信号的信道的预定范围内不发送信号的信道的衰减量被设定为等于发送信号的信道的衰减量的值。 没有信号从发送信号的信道发送出预定范围的信道的衰减量被设置为大于发送信号的信道的衰减量的值。 信号灯根据值进行衰减并进行复用。

公开(公告)号：US20070229941A1

公开(公告)日：2007-10-04

申请号：US11598098

申请日：2006-11-13

申请人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro

发明人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro

IPC分类号： H01S3/00 ,  H04B10/12

CPC分类号： H04B10/2935 ,  H01S3/06758 ,  H01S3/10015

摘要： An optical amplifier of the present invention comprises: first and second optical amplifying sections connected in series to each other between an input port and an output port; a first variable optical attenuator arranged on a former stage of the first optical amplifying section; a second variable optical attenuator arranged between the first and second optical amplifying sections; an optical amplification control section that controls the first and second optical amplifying sections; and an optical attenuation control section that controls the first and second variable optical attenuators. The optical amplification control section controls each of the optical amplifying sections so that a gain of the entirety of the optical amplifier is held constant, and the optical attenuation control section controls attenuation amounts of the variable optical attenuators so that monitor values of the output powers from the variable optical attenuators approximate the same value, provided that a value of the sum of the attenuation amounts of the variable optical attenuators decided according to the signal light input power per one wavelength of a WDM light is held constant. As a result, it becomes possible to provide at a low cost the optical amplifier capable of achieving flat output wavelength characteristics and the favorable NF, irrespective of the signal light input power per one wavelength of the WDM light and the number of wavelengths thereof.

摘要翻译： 本发明的光放大器包括：在输入端口和输出端口之间彼此串联连接的第一和第二光放大部分; 布置在第一光放大部分的前级上的第一可变光衰减器; 布置在第一和第二光放大部分之间的第二可变光衰减器; 控制所述第一和第二光学放大部分的光放大控制部分; 以及光衰减控制部分，其控制第一和第二可变光衰减器。 光放大控制部分控制每个光放大部分，使得整个光放大器的增益保持恒定，并且光衰减控制部分控制可变光衰减器的衰减量，使得输出功率的监视值从 可变光衰减器近似相同的值，条件是根据WDM光的每一个波长的信号光输入功率确定的可变光衰减器的衰减量之和的值保持恒定。 结果，可以以低成本提供能够实现平坦的输出波长特性和良好的NF的光放大器，而与WDM光的每个波长的信号光输入功率和波长数无关。

公开(公告)号：US08116626B2

公开(公告)日：2012-02-14

申请号：US12453060

申请日：2009-04-28

申请人： Tomoaki Takeyama ,  Ichiro Nakajima ,  Keiko Sasaki ,  Shinichirou Muro ,  Etsuko Hayashi

发明人： Tomoaki Takeyama ,  Ichiro Nakajima ,  Keiko Sasaki ,  Shinichirou Muro ,  Etsuko Hayashi

IPC分类号： H04B10/08 ,  H04B10/04

CPC分类号： H04B10/07955 ,  H04J14/0221

摘要： In an optical transmission apparatus, levels of signal lights obtained by demultiplexing a WDM signal and corresponding to channels are detected, based on which a channel in which a signal is transmitted and a channel in which no signal is transmitted are determined. An attenuation amount of a channel in which no signal is transmitted in a predetermined range from the channel in which the signal is transmitted is set to a value equal to an attenuation amount of the channel in which the signal is transmitted. An attenuation amount of a channel in which no signal is transmitted out of the predetermined range from the channel in which the signal is transmitted is set to a value larger than the attenuation amount of the channel in which the signal is transmitted. The signal lights are attenuated based on the values and multiplexed.

摘要翻译： 在光传输装置中，检测通过对WDM信号进行解复用和对应于信道而获得的信号光的电平，基于该信号的信号被发送的信道和没有发送信号的信道被确定。 在发送信号的信道的预定范围内不发送信号的信道的衰减量被设定为等于发送信号的信道的衰减量的值。 没有信号从发送信号的信道发送出预定范围的信道的衰减量被设置为大于发送信号的信道的衰减量的值。 信号灯根据值进行衰减并进行复用。

公开(公告)号：US07990608B2

公开(公告)日：2011-08-02

申请号：US11845335

申请日：2007-08-27

申请人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro

发明人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro

IPC分类号： H04B10/17 ,  H04B10/12

CPC分类号： H01S3/06758 ,  H01S3/10015 ,  H01S3/1305 ,  H01S3/2316

摘要： An optical amplifier reducing gain deviation caused by wavelength arrangement has a first-stage optical amplifying unit, an attenuator, a second-stage optical amplifying unit, an automatic gain controller controlling the first- and second-stage optical amplifying units so that a gain of signal light outputted from the second-stage optical amplifying unit to signal light inputted to the first-stage optical amplifying unit is constant, and an attenuation amount controller controlling an attenuation amount at the attenuator to adjust gain-versus-wavelength characteristic at the automatic-gain-controlled first- and second-stage optical amplifying units on the basis of information on wavelength arrangement and an input level of the signal light inputted to the first-stage optical amplifying unit so that gain slope characteristic at the first- and second-stage optical amplifying units due to the wavelength arrangement and the input level is flattened.

摘要翻译： 降低由波长配置引起的增益偏差的光放大器具有第一级光放大单元，衰减器，第二级光放大单元，控制第一级和第二级光放大单元的自动增益控制器， 从第二级光放大单元输出的信号光信号是恒定的，并且衰减量控制器控制衰减器处的衰减量，以调节自动 - 基于波长配置的信息和输入到第一级光放大单元的信号光的输入电平，使得增益控制的第一级和第二级光放大单元在第一级和第二级的增益斜率特性 由于波长布置和输入电平而导致的光放大单元变平。

公开(公告)号：US07616848B2

公开(公告)日：2009-11-10

申请号：US11709729

申请日：2007-02-23

申请人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro ,  Etsuko Hayashi

发明人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro ,  Etsuko Hayashi

IPC分类号： G02B6/26

CPC分类号： H04J14/0221 ,  H04B10/506 ,  H04B10/564 ,  H04J14/0204 ,  H04J14/0212 ,  H04J14/0227

摘要： In an optical transmission apparatus, optical power of each of wavelength contained in a wavelength multiplexing signal is measured, a measured value of the optical power of each wavelength is compared with a predetermined threshold value, a total value of the measured values of the optical power, which are equal to or larger than the threshold value, is calculated as a total value of signal beam power, and a total value of the measured values of the optical power, which are less then the threshold value, is calculated as a total value of ASE power. The number of the measured values of the optical power, which are equal to or larger than the threshold value, is calculated as a wavelength count of the signal beams contained in the wavelength multiplexing signal. A signal-to-ASE ratio is calculated from the total value of the signal beam power and the total value of the ASE power. The optical power of the wavelength multiplexing signal inputted to an optical amplifier is measured, and a target value of the automatic level control (ALC) is determined by use of the measured values of the wavelength count, the signal-to-ASE ratio and the optical power of the wavelength multiplexing signal in order to execute the ALC of the optical amplifier so that the optical power of each of the wavelengths in the wavelength multiplexing signal outputted from the optical amplifier, becomes constant.

摘要翻译： 在光传输装置中，测定包含在波长多路复用信号中的各波长的光功率，将各波长的光功率的测量值与预定阈值进行比较，光功率的测量值的总和 被计算为信号光束功率的总值，并且计算小于阈值的光功率的测量值的总值作为总值，其等于或大于阈值 的ASE电力。 计算出等于或大于阈值的光功率的测量值的数量作为包含在波长复用信号中的信号光束的波长计数。 从信号光束功率的总值和ASE功率的总值计算信号到ASE比。 测量输入到光放大器的波长复用信号的光功率，并且通过使用波长计数，信号与ASE比和测量值的测量值来确定自动电平控制（ALC）的目标值 为了执行光放大器的ALC，使得从光放大器输出的波长复用信号中的每个波长的光功率变得恒定，所以波长多路复用信号的光功率变得恒定。

公开(公告)号：US08379299B2

公开(公告)日：2013-02-19

申请号：US12692591

申请日：2010-01-23

申请人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro

发明人： Tomoaki Takeyama ,  Keiko Sasaki ,  Shinichirou Muro

IPC分类号： H04B10/17 ,  H04B10/12

CPC分类号： H01S3/06758 ,  H01S3/094011 ,  H01S3/10015 ,  H01S3/1301 ,  H01S2301/04

摘要： An optical amplifier includes a first excitation light source that outputs a first excitation light; a second excitation light source that outputs a second excitation light; a first amplifying optical fiber doped with a rare-earth element and excited by the first excitation light to amplify light input to the first amplifying optical fiber; and a second amplifying optical fiber doped with a rare-earth element and excited by the second excitation light to amplify the light from the first amplifying optical fiber. A ratio between the intensity of the first excitation light and the intensity of the second excitation light is controlled according to the number of signal lights wavelength-multiplexed in the light input.

摘要翻译： 光放大器包括：第一激发光源，其输出第一激发光; 输出第二激发光的第二激发光源; 掺杂有稀土元素并被第一激发光激发以放大输入到第一放大光纤的光的第一放大光纤; 以及掺杂有稀土元素并被第二激发光激发以放大来自第一放大光纤的光的第二放大光纤。 根据在光输入中波长多路复用的信号光的数量来控制第一激发光的强度与第二激发光的强度之比。