-
公开(公告)号：US5710660A
公开(公告)日：1998-01-20
申请号：US606653
申请日：1996-02-26
申请人： Shu Yamamoto , Hidenori Taga , Noboru Edagawa , Shigeyuki Akiba , Kuniaki Motoshima , Katsumi Takano , Tadayoshi Kitayama
发明人： Shu Yamamoto , Hidenori Taga , Noboru Edagawa , Shigeyuki Akiba , Kuniaki Motoshima , Katsumi Takano , Tadayoshi Kitayama
CPC分类号： H04B10/2931 , H01S3/06758 , H01S3/1301
摘要： This invention provides an optical amplifier which has low noise characteristics for a wide range of input signal electric power. The optical amplifier has a plurality of cascaded optical amplifying units, a signal level detector, and a pump-source controller. The pump-source controller changes controlling objects from a pump-source corresponding to a first one of the optical amplifying units to a pump-source corresponding to a second one of the optical amplifying units according to a detection level of the signal level detector from a low level to a high level. When the detection level is outside of a control object range, the optical amplifier controls an output from the pump-source to stabilize. When the detection level is within the control object range, the optical amplifier controls an output from a pump-source of each of optical amplifying units according to the detection level.
摘要翻译： 本发明提供一种对于宽范围的输入信号电力具有低噪声特性的光放大器。 光放大器具有多个级联的光放大单元，信号电平检测器和泵源控制器。 泵源控制器根据来自信号电平检测器的检测电平，将对应于第一光放大单元的泵浦源的控制对象改变为对应于第二光放大单元的泵浦源 低水平到高水平。 当检测电平超出控制对象范围时，光放大器控制泵源的输出稳定。 当检测水平处于控制对象范围内时，光放大器根据检测水平控制每个光放大单元的泵浦源的输出。
-
公开(公告)号：US5510930A
公开(公告)日：1996-04-23
申请号：US276408
申请日：1994-07-18
申请人： Kuniaki Motoshima , Tadayoshi Kitayama , Junichiro Yamashita , Eiichi Nakagawa , Shigeyuki Akiba , Masatoshi Suzuki , Koji Goto , Haruo Abe , Naoki Norimatsu
发明人： Kuniaki Motoshima , Tadayoshi Kitayama , Junichiro Yamashita , Eiichi Nakagawa , Shigeyuki Akiba , Masatoshi Suzuki , Koji Goto , Haruo Abe , Naoki Norimatsu
CPC分类号： H01S3/094003 , H01S3/09408
摘要： A light amplifying apparatus adopting a redundant structure. Optical isolators 13, 14 are inserted between pump light sources 1, 2 and a photocoupler 4 so as to prevent injection locking, thereby preventing fluctuation of pump power.In another embodiment, optical fibers 15 adequately longer than the coherence length of the excitation light waves output from the pump light sources are provided. In still another embodiment, the frequency of the driving current for the pump light sources is modulated. In a further embodiment, wave plates 20, 21 are provided so as to circularly polarize the light waves output from the pump light sources clockwise and counterclockwise.
摘要翻译： 采用冗余结构的光放大装置。 光隔离器13,14插入在泵浦光源1,2和光电耦合器4之间，以防止注入锁定，从而防止泵浦功率的波动。 在另一个实施例中，提供了足够长于从泵浦光源输出的激发光波的相干长度的光纤15。 在另一个实施例中，泵浦光源的驱动电流的频率被调制。 在另一实施例中，波片20,21被设置成使从泵浦光源输出的光波顺时针和逆时针圆偏振。
-
公开(公告)号：US5760949A
公开(公告)日：1998-06-02
申请号：US706611
申请日：1996-09-05
CPC分类号： H01S3/094003 , H01S3/09408 , H01S3/1312
摘要： Reflectors each having a reflectance peak wavelength within a band of the wavelength characteristics of a laser amplification factor in the unsaturated state of each light source for excitation are provided between light sources for excitation and an optical coupler, and stable wavelength locking is effected by returning a portion of a small portion of excited light reflected by the reflectors into the light sources for excited light.
摘要翻译： 在激发用光源和光耦合器的光源之间设置各激光放大倍数的波长特性的带内的反射率峰值波长的反射器，并且通过返回稳定的波长锁定 由反射器反射的激发光的一小部分到用于激发光的光源中。
-
公开(公告)号：US4940306A
公开(公告)日：1990-07-10
申请号：US300786
申请日：1989-01-23
IPC分类号： G02B6/28 , H04B10/272
CPC分类号： H04B10/2725 , G02B6/2808 , H04B10/272
摘要： A star network optical transmission system comprising a star coupler as a center node, wherein a star coupler is provided with an optical fiber exhibiting a multimode transmission characteristic to an optical signal transmitted by said star coupler at an input portion and an output portion, an optical transmission apparatus having a laser with a wavelength of .lambda. as a light source, an up optical fiber exhibiting a single mode transmission characteristic to a wavelength of .lambda. connecting the optical transmission apparatus to the star coupler, an optical reception apparatus, and a down optical fiber exhibiting a multimode transmission characteristic at a wavelength .lambda. and connecting the optical reception apparatus to said star coupler.
摘要翻译： 一种星形网络光传输系统，包括星形耦合器作为中心节点，其中星形耦合器设置有对由输入部分和输出部分上由所述星形耦合器传输的光信号呈现多模传输特性的光纤，光学 具有波长为λ的激光作为光源的发送装置，向光耦合器连接光传输装置的呈波长λ的单模传输特性的上光纤，光接收装置和下光纤 呈现波长λ的多模传输特性并将光接收装置连接到所述星形耦合器。
-
公开(公告)号：US5978124A
公开(公告)日：1999-11-02
申请号：US636792
申请日：1996-04-22
IPC分类号： H04B10/50 , H04B10/564 , H04B10/04
CPC分类号： H04B10/504 , H04B10/564
摘要： A light emitting control apparatus comprises a light emitting element which emits a light when an input electrical signal is converted into a light signal, a monitoring circuit which monitors the output level of the light emitting element, a sample-and-hold circuit which detects a peak value and is put into the sample mode when data of the monitoring circuit is in the mark state showing voltage and which is in turn put into the hold mode when the data is in the space state showing no voltage, and an amplifier which accomplishes negative feedback control of the output level of the light emitting element by using the output of the sample-and-hold circuit. Thus, the apparatus can quickly respond to a change of the input state and stabilize the output level of the light emitting element for a long time.
摘要翻译： 发光控制装置包括当输入电信号被转换为光信号时发出光的发光元件，监视发光元件的输出电平的监视电路，检测出发光元件的采样保持电路 峰值，并且当监视电路的数据处于表示电压的标记状态并且当数据处于不显示电压的空间状态时又进入保持模式时被置于采样模式，并且实现负的放大器 通过使用采样保持电路的输出对发光元件的输出电平进行反馈控制。 因此，该装置可以快速响应输入状态的改变并且长时间稳定发光元件的输出电平。
-
公开(公告)号：US5506724A
公开(公告)日：1996-04-09
申请号：US309921
申请日：1994-09-21
IPC分类号： G02F1/35 , H01S3/094 , H01S3/13 , H04B10/07 , H04B10/293 , H04B10/294 , H04B10/564 , H04B10/572 , H04J14/00 , H04J14/02 , H01S3/00
CPC分类号： H04B10/296 , H01S3/094003 , H01S3/1301 , H01S2301/06 , H01S3/094011 , H01S3/094023
摘要： An optical fiber which amplifies an input signal by a pump source, a compensation-signal source which injects a compensation-signal propagating contra-directionally with respect to the input signal Into the optical fiber, a gain detector which measures a spontaneous emission light of the pump source at an input side of the optical fiber and a compensation-signal source controller which controls output of the compensation-signal source based on output of the gain detector are provided. In addition, a coupler and a wavelength selective reflector which reflects a light of the same wavelength as the compensation-signal selectively, are provided at the input side of the optical fiber.
摘要翻译： 一种通过泵浦源放大输入信号的光纤，将与输入信号相反方向传播的补偿信号注入到光纤中的补偿信号源，测量自发发射光的增益检测器， 提供了在光纤的输入侧的泵浦源，以及基于增益检测器的输出来控制补偿信号源的输出的补偿信号源控制器。 此外，在光纤的输入侧设置耦合器和选择性地反射与补偿信号相同波长的光的波长选择性反射器。
-
公开(公告)号：US5107362A
公开(公告)日：1992-04-21
申请号：US469077
申请日：1990-01-19
IPC分类号： H04B10/04
CPC分类号： H04B10/50
摘要： An optical transmission apparatus is disclosed which comprises a light emitting element for outputting an optical output in order to transmit data, a current modulation circuit, a bias current generating circuit and a resistor circuit connected in parallel with the emitting element. The current modulation circuit supplies a binary modulated current to the emitting element in response to an input binary data to the transmitted, the bias current generating circuit provides a bias current to the emitting element and the resisor circuit, whereby said bias current is kept higher than a specified level.
摘要翻译： 公开了一种光传输装置，其包括用于输出光输出以发射数据的发光元件，电流调制电路，偏置电流产生电路和与发光元件并联连接的电阻电路。 当前调制电路响应于传输的输入二进制数据向发射元件提供二进制调制电流，偏置电流产生电路向发射元件和阻抗电路提供偏置电流，由此所述偏置电流保持高于 指定级别。
-
公开(公告)号：US06989717B2
公开(公告)日：2006-01-24
申请号：US10477945
申请日：2002-12-03
IPC分类号： H03F3/08
CPC分类号： H03G3/3084 , H03F3/087 , H03F2200/78 , H04B10/695
摘要： A pre-amplifier amplifies an output current of a photodetector that converts a burst optical signal into an electrical signal, and outputs an electric voltage signal. A gain switching circuit is connected with a serial circuit comprising a resistor and a switch and a serial circuit comprising a resistor and a switch, in parallel with a feedback resistor. The gain switching circuit includes an arrangement to receive the electric voltage signal output from the pre-amplifier, close the switch at a specific bit position, close the switch at the other specific bit position, upon occurrence of a situation that the switch is to be closed, provided that the switch is closed.
摘要翻译： 前置放大器放大将突发光信号转换为电信号的光检测器的输出电流，并输出电压信号。 增益切换电路与包括电阻器和开关的串联电路和包括与反馈电阻并联的电阻器和开关的串联电路连接。 增益切换电路包括用于接收从前置放大器输出的电压信号的装置，在特定位位置闭合开关，在发生开关的情况下在另一特定位位置闭合开关 关闭，只要开关闭合。
-
9.发明授权公开(公告)号：US06657778B1
公开(公告)日：2003-12-02
申请号：US09806456
申请日：2001-04-18
IPC分类号： H04B1012
CPC分类号： H04B10/2941 , H04B10/296 , H04B2210/258 , H04J14/0221
摘要： Light signals of first to n-th bands amplified en bloc undergo proper attenuation through an adjustable optical attenuator in conformance with attenuation in an optical fiber connected to input of an optical amplifying repeater apparatus, whereon the light signals are demultiplexed or separated into individual bands and amplified by first to n-th fixed-gain optical amplifiers (#1, . . . , #n) each having a high fixed gain in the respective bands to be subsequently multiplexed by an optical multiplexer and then sent out onto a transmission line. A monitoring light branching device extracts a part of light power of a specific monitoring wavelength, which is then fed to an adjustable attenuator control circuit which controls the attenuation factor of the adjustable optical attenuator so that the light power of the specific wavelength remains constant. The gain of the optical amplifying repeater apparatus at the specific wavelength can thus be determined. By employing as the optical amplifying medium a substantially homogeneous medium, the gain for the other wavelengths can be fixed. The optical amplifying repeater apparatus whose gain is essentially independent of the change in the number of the wavelengths can thus be realized.
摘要翻译： 第一至第n个频带放大的光信号通过可调节的光衰减器经过适当的衰减，其符合连接到光放大中继器设备的输入的光纤中的衰减，其中光信号被解复用或分离成单个频带， 由第一至第n固定增益光放大器（＃1，...，#n）放大，每个固定增益光放大器（＃1，...，#n）在各个频带中具有高固定增益，随后由光复用器复用，然后发送到传输线。 监视光分支装置提取特定监视波长的一部分光功率，然后将其馈送到可调节衰减器控制电路，该可调节衰减器控制电路控制可调节光衰减器的衰减因子，使得特定波长的光功率保持恒定。 因此可以确定特定波长的光放大中继器装置的增益。 通过采用基本均匀的介质作为光放大介质，可以固定其它波长的增益。 因此可以实现其增益基本上与波长数量的变化无关的光放大中继器装置。
-
公开(公告)号：US06215368B1
公开(公告)日：2001-04-10
申请号：US09337730
申请日：1999-06-22
申请人： Hitoyuki Tagami , Kuniaki Motoshima
发明人： Hitoyuki Tagami , Kuniaki Motoshima
IPC分类号： H03B512
CPC分类号： H03K3/0322 , H03K3/0231 , H03K3/03
摘要： Voltage controlling/oscillating device comprises a terminal for setting the delay rate in the delay unit and the delay interpolator. Clock signal whose phase is inverted by the inverting gate is inputted into a first input terminal of the delay interpolator and into the delay unit. The delay unit delays the signal by d1 and inputs into second input terminal of the delay interpolator. Oscillation frequency control voltage is fed into a terminal of the delay interpolator through an oscillation frequency control terminal of the device. Delay control voltage is fed into a terminal of the device in order to control a propagation delay rate in the delay unit and the delay interpolator. The delay rate in a delay unit and a delay interpolator can be adjusted by a delay control voltage.
摘要翻译： 电压控制/振荡装置包括用于设置延迟单元和延迟内插器中的延迟速率的端子。 相位被反相门反相的时钟信号被输入到延迟内插器的第一输入端并进入延迟单元。 延迟单元将信号延迟d1并输入到延迟插值器的第二输入端。 振荡频率控制电压通过器件的振荡频率控制端子馈送到延迟插补器的端子。 延迟控制电压被馈送到设备的终端中，以便控制延迟单元和延迟内插器中的传播延迟速率。 可以通过延迟控制电压来调整延迟单元和延迟内插器中的延迟率。
-
-
-
-
-
-
-
-
-
搜索结果
21 条记录 (耗时 0.028 秒)