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公开(公告)号：US5471334A
公开(公告)日：1995-11-28
申请号：US139227
申请日：1993-10-19
申请人： Hiroji Masuda , Kazuo Aida , Kiyoshi Nakagawa
发明人： Hiroji Masuda , Kazuo Aida , Kiyoshi Nakagawa
IPC分类号： H04B10/073 , H04B10/077 , H04B10/079 , H04B10/291 , H04B17/00
CPC分类号： H04B10/0731 , H04B10/077 , H04B10/07955 , H04B10/291 , H04B2210/003
摘要： A method and an apparatus for monitoring the noise figure of an optical amplifier such as used in linear repeaters in an optical transmission system formed by cascaded linear repeaters. The apparatus includes at least one optical amplifier for amplifying input signal light and a narrow bandwidth optical filter for removing amplified spontaneous emission (ASE) light generated at the optical amplifier. A gain detector is provided to detect the gain of the optical amplifier and an ASE optical power detector detects an optical power of the ASE light generated at the optical amplifier. The apparatus includes a splitter for splitting light entering into the narrow bandwidth optical filter and a local oscillator for generating local light having a wavelength displaced from a wavelength of the input signal light. The light split by the splitter is coupled with the local light generated by the local oscillator. An optical power detector makes a heterodyne detection of the optical power of the coupled light. An electrical band-pass filter extracts the optical power of the ASE light generated by the optical amplifier from the optical power obtained by the optical power detector. A noise figure calculator calculates the noise figure according to the gain detected by the gain detector and the optical power of the ASE light detected by the ASE optical power detector.
摘要翻译： 一种用于监测光放大器的噪声系数的方法和装置，例如在由级联线性转发器形成的光传输系统中用于线性中继器中。 该装置包括用于放大输入信号光的至少一个光放大器和用于去除在光放大器处产生的放大的自发发射（ASE）光的窄带宽滤光器。 提供增益检测器来检测光放大器的增益，并且ASE光功率检测器检测在光放大器处产生的ASE光的光功率。 该装置包括用于分离进入窄带宽滤光器的光的分离器和用于产生具有从输入信号光的波长偏移的波长的局部光的本地振荡器。 由分路器分开的光与由本地振荡器产生的局部光耦合。 光功率检测器对耦合光的光功率进行外差检测。 电带通滤波器从由光功率检测器获得的光功率中提取由光放大器产生的ASE光的光功率。 噪声系数计算器根据由增益检测器检测的增益和由ASE光功率检测器检测到的ASE光的光功率计算噪声系数。
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2.发明授权Optical fiber amplifier including rare earth doped fiber and feedback pump light source control 失效光纤放大器，包括稀土接地光纤和反馈泵光源控制
公开(公告)号：US5245690A
公开(公告)日：1993-09-14
申请号：US892945
申请日：1992-06-03
申请人： Kazuo Aida , Hiroji Masuda , Kiyoshi Nakagawa
发明人： Kazuo Aida , Hiroji Masuda , Kiyoshi Nakagawa
IPC分类号： G02B6/00 , G02F1/35 , H01S3/06 , H01S3/07 , H01S3/0915 , H01S3/094 , H01S3/10 , H01S3/13 , H01S3/131 , H01S5/068 , H01S5/0683 , H01S5/50
CPC分类号： H01S3/1301 , H01S5/50 , H01S2301/02 , H01S3/06704 , H01S3/094011 , H01S5/06825 , H01S5/0683
摘要： An optical amplifier using either rare-earth doped optical fiber, which can amplify an optical signal when a pumping light is injected, or a laser diode amplifier, which can amplify an optical signal by injection of an electric current. The amplifiers being of simple construction and having a gain which can be maintained constant through feedback control based on the detection of spontaneous emission from the sides of either the rare-earth doped optical fiber or the laser diode. The control being performed without the need for detection of input or output optical signal of the optical amplifier.
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公开(公告)号：US5633750A
公开(公告)日：1997-05-27
申请号：US641218
申请日：1996-04-30
申请人： Seiji Nogiwa , Kazuo Aida , Kiyoshi Nakagawa
发明人： Seiji Nogiwa , Kazuo Aida , Kiyoshi Nakagawa
CPC分类号： H01S3/1301 , H01S3/06754 , H01S3/10015 , H01S3/1608
摘要： The invention offers an optical fiber amplifier with good frequency characteristics which allows the gain to be held constant even without an input signal beam and allows gain control with respect to input optical signals with high-speed power fluctuations. An excitation beam source 8 supplies an excitation beam for light amplification and a control beam source 15 supplies a control beam for controlling the gain to an EDF 4 which amplifies a signal beam by means of optical excitation. An excitation beam monitor 9 measures the power of the excitation beam when inputted to the EDF 4 and an excitation beam monitor 12 measures the power of the excitation beam when outputted from the EDF 4. A comparator 11 calculates the ratio between the power measured by the excitation beam monitor 9 and the power measured by the excitation beam monitor 12. A drive circuit 14 controls the power of the control beam supplied by the control beam source 15 based on the results obtained by the comparator 11.
摘要翻译： 本发明提供了具有良好频率特性的光纤放大器，其允许即使没有输入信号光束也可以将增益保持为恒定，并且允许相对于具有高速功率波动的输入光信号的增益控制。 激励光束源8提供用于光放大的激励光束，并且控制光束源15将控制光束提供给EDF 4，EDF 4通过光激励来放大信号光束。 激励光束监视器9在输入到EDF 4时测量激发光束的功率，激励光束监视器12在从EDF 4输出时测量激励光束的功率。比较器11计算由 激励光束监视器9和由激励光束监视器12测量的功率。驱动电路14基于由比较器11获得的结果来控制由控制光束源15提供的控制光束的功率。
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公开(公告)号：US5495362A
公开(公告)日：1996-02-27
申请号：US417675
申请日：1995-04-06
申请人： Tatuhiko Takatu , Kazuo Aida , Kiyoshi Nakagawa
发明人： Tatuhiko Takatu , Kazuo Aida , Kiyoshi Nakagawa
CPC分类号： H01S3/06754 , H01S3/1301 , H01S3/06791 , H01S3/094003
摘要： The object of the present invention is to control the amplification rate of a photoperiodic circuit by stable negative feedback control, thereby suppressing fluctuations in the circulating light in the photoperiodic circuit. The circulating light in the photoperiodic circuit is converted into an electrical signal, indicating the intensity of the circulating light, which is held in a first sample-and-hold circuit. Additionally, an electrical signal indicating the intensity of circulating light of the circuit previous to that of the first sample-and-hold circuit is held in a second sample-and-hold circuit. The difference in the value between the electrical signals which indicate intensities of the circulating light are determined by a subtraction circuit. The result is supplied to an addition circuit through a third sample-and-hold circuit. The addition circuit adds the output of the third sample-and-hold circuit with the output of a standard electrical power source, and the result is supplied to an excitation light source. The excitation light source supplies excitation light, having an intensity dependent upon the above-mentioned addition result, to a rare-earth-doped fiber.
摘要翻译： 本发明的目的是通过稳定的负反馈控制来控制光周期性电路的放大率，从而抑制光周期性电路中的循环光的波动。 光周期性电路中的循环光转换为电信号，表示保持在第一采样保持电路中的循环光的强度。 另外，表示第一采样保持电路之前的电路的循环光强度的电信号被保持在第二采样保持电路中。 指示循环光强度的电信号之间的差值由减法电路确定。 结果通过第三采样保持电路提供给加法电路。 加法电路将第三采样保持电路的输出与标准电源的输出相加，并将结果提供给激励光源。 激发光源将具有取决于上述添加结果的强度的激发光提供给稀土掺杂光纤。
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公开(公告)号：US5786930A
公开(公告)日：1998-07-28
申请号：US785844
申请日：1997-01-24
申请人： Tatsuhiko Takatsu , Kazuo Aida , Kiyoshi Nakagawa
发明人： Tatsuhiko Takatsu , Kazuo Aida , Kiyoshi Nakagawa
CPC分类号： H01S3/0057 , G02F1/11
摘要： An optical frequency sweep signal generator using an optical frequency variable bandpass filter which can be practically used is provided. The optical frequency sweep signal generator comprises: a circulation control circuit for generating a first electric signal which indicates the start and the end of a sweep; an optical loop circuit; an optical frequency variable bandpass filter, provided in the loop circuit, for suppressing circulation of natural emission light output from an optical amplifier; a light receiving element for converting a part of light output from the optical loop circuit into a second electric signal; a sweep signal analyzing circuit for outputting a set value for compensating for a difference between the center frequency of the optical frequency variable bandpass filter and the optical frequency of the pulsed light based on the first and second electric signals; and a driving circuit for supplying a driving signal for determining the center frequency of the optical frequency variable bandpass filter to the optical frequency variable bandpass filter, based on the first electric signal and the set value.
摘要翻译： 提供了使用可实际使用的光频可变带通滤波器的光频扫描信号发生器。 光频扫描信号发生器包括：循环控制电路，用于产生指示扫描的开始和结束的第一电信号; 光环回路; 设置在环路电路中的用于抑制从光放大器输出的自然发射光的循环的光频可变带通滤波器; 光接收元件，用于将从光环路输出的光的一部分转换为第二电信号; 扫描信号分析电路，用于基于第一和第二电信号输出用于补偿光频可变带通滤波器的中心频率与脉冲光的光频率之间的差的设定值; 以及驱动电路，用于根据第一电信号和设定值向光频可变带通滤波器提供用于确定光频可变带通滤波器的中心频率的驱动信号。
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公开(公告)号：US5596441A
公开(公告)日：1997-01-21
申请号：US417679
申请日：1995-04-06
CPC分类号： H04B10/2572
摘要： An optical polarization controller comprises a polarization control element, a polarizer, a light divider and a photo-detector. The polarization control element rotates a plane of polarization of an Input signal light by a rotation angle in a predetermined rotational direction and outputs the result as a rotated signal light. The polarizer extracts a component of the rotated signal light having a predetermined plane of polarization and outputs the component as a polarized signal light. The light divider divides the polarized signal light into a plurality of polarized signal lights which have the same planes of polarization as the plane of the polarized light outputted by the polarizer. The photo-detector detects a level of one of the plurality of polarized signal lights and supplies a control signal indicating the level to the polarization control element. Under this control, the plane of polarization of the signal light outputted by the polarization control element is controlled so as to correspond to the plane of polarization of the light divider.
摘要翻译： 光偏振控制器包括偏振控制元件，偏振器，分光器和光检测器。 偏振控制元件使输入信号光的偏振面旋转预定旋转方向的旋转角度，并输出作为旋转信号光的结果。 偏振器提取具有预定偏振面的旋转信号光的分量，并将该分量输出为偏振信号光。 分光器将偏振信号光分成与偏振器输出的偏振光平面相同的偏振平面的多个偏振信号光。 光检测器检测多个偏振信号光之一的电平，并将指示该电平的控制信号提供给偏振控制元件。 在该控制下，由偏振控制元件输出的信号光的偏振面被控制成与分光器的偏振面对应。
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公开(公告)号：US5574534A
公开(公告)日：1996-11-12
申请号：US547664
申请日：1995-10-24
申请人： Seiji Nogiwa , Kazuo Aida , Kiyoshi Nakagawa
发明人： Seiji Nogiwa , Kazuo Aida , Kiyoshi Nakagawa
CPC分类号： H04B10/291 , H04B10/2912
摘要： A noise determination apparatus for simple and precise determination of a noise factor of an optical fiber amplifier is presented. An optical pulse Pin is inputted via an optical coupler 2 into an optical looping circuit 14, and for every loop around the circuit 14, the spontaneous emission light generated in a rare-earth doped optic fiber amplifier 4 is integrated. The amplitude of the light intensity of the optical pulse train outputted from the optical splitter 3 decreases as the looping cycles are increased, and ultimately, the light intensity of the accumulated spontaneous emission light becomes equal to that of the optical pulse train. The pulse train outputted from the photodetector 7 diminishes. The number of pulses in the looping process from the initial pulse train to the expiration event are counted by means of a pulse counting device 8. Based on the count, the noise factor NF of the optical amplifier 4 is calculated using the gain of the optical amplifier 4, the bandwidth of the bandpass filter 5, oscillation frequency of light and the pulse intensity.
摘要翻译： 提出了用于简单且精确地确定光纤放大器的噪声因子的噪声确定装置。 光脉冲Pin通过光耦合器2输入到光环路电路14中，并且对于围绕电路14的每个环路，在稀土掺杂光纤放大器4中产生的自发发射光被集成。 从分光器3输出的光脉冲串的光强度的振幅随着循环周期的增加而减小，最终累积的自发发光的光强度变得等于光脉冲序列的光强度。 从光电检测器7输出的脉冲串减少。 通过脉冲计数装置8对从初始脉冲序列到到期事件的循环处理中的脉冲数进行计数。基于该计数，使用光学器件的增益来计算光放大器4的噪声系数NF 放大器4，带通滤波器5的带宽，光的振荡频率和脉冲强度。
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公开(公告)号：US5475529A
公开(公告)日：1995-12-12
申请号：US443020
申请日：1995-05-17
申请人： Tatuhiko Takatu , Kazuo Aida , Kiyoshi Nakagawa
发明人： Tatuhiko Takatu , Kazuo Aida , Kiyoshi Nakagawa
CPC分类号： H01S3/1301 , H01S3/06754 , H01S3/10015
摘要： A high fidelity optical amplifier having a stable amplification gain is presented. The problem of signal distortion in an output optical signal caused by an imbalance of light energy generation and consumption within the optical fiber is resolved by generating a delayed correction signal to be used in a feedback control circuitry. An incoming optical signal is split into two signals: one split signal is forwarded to a photo-detector element for generation of the correction signal while the other split signal is forwarded to a signal delay circuit. The optical delay circuit delays the timing of inputting the correction signal into output optical fiber for a specific duration of time to attain a full amplification gain within the optical fiber. The correction signal generation circuit performs differentiation of an electrical input signal followed by detection and selection of a maximum amplitude over a standard reference voltage. The selected signal acts as trigger to the pulse generation circuit and waveform correction circuit in conjunction with a variable-gain amplifier to provide a correction signal to maintain the amplification gain of the optical fiber at a constant level. The resulting output signal is distortion-free and stable over a prolonged period of time.
摘要翻译： 提出了具有稳定放大增益的高保真光放大器。 通过产生在反馈控制电路中使用的延迟校正信号来解决由光纤内的光能产生和消耗不平衡引起的输出光信号中的信号失真问题。 输入光信号被分成两个信号：一个分离信号被转发到光电检测器元件以产生校正信号，而另一个分离信号被转发到信号延迟电路。 光延迟电路将校正信号输入输出光纤的定时延迟特定持续时间以获得光纤内的全放大增益。 校正信号发生电路执行电输入信号的微分，随后检测并选择最大幅度超过标准参考电压。 所选择的信号作为触发脉冲发生电路和波形校正电路结合可变增益放大器提供校正信号，以将光纤的放大增益保持在恒定水平。 所产生的输出信号在长时间内无失真和稳定。
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公开(公告)号：US5083874A
公开(公告)日：1992-01-28
申请号：US506906
申请日：1990-04-10
IPC分类号： H04B10/291 , H04B10/293 , H04B10/294
CPC分类号： H04B10/2912 , H04B10/291 , H04B10/2935 , H04B10/2941 , H04B2210/258
摘要： At least one optical repeater is connected in series to an optical signal transmission fiber of an optical fiber cable interconnecting transmitting and receiving terminals, and the optical repeater has an optical amplifier which is excited by pump light to amplify signal light. The pump light is supplied from the outside of the optical repeater, and the pump light supplied is input into the optical amplifier via at least one of its input end and output end. The optical repeater may include an optical divider for dividing the pump light supplied thereto into two, which are input into the optical amplifier via its input end and output end, respectively.
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公开(公告)号：US5005937A
公开(公告)日：1991-04-09
申请号：US506832
申请日：1990-04-10
申请人： Kazuo Aida , Shigendo Nishi , Kiyoshi Nakagawa
发明人： Kazuo Aida , Shigendo Nishi , Kiyoshi Nakagawa
IPC分类号： H04B10/27 , H04B10/272 , H04B10/278 , H04B10/291 , H04B10/293
CPC分类号： H04B10/278 , H04B10/27 , H04B10/2725 , H04B10/291 , H04B10/2912 , H04B10/2931 , H04B10/2939
摘要： In optical branching equipment which is supplied with an optical signal of a first wavelength band from a trunk line terminal equipment via a trunk line cable and is inserted in the trunk line, the optical signal is normally provided to the trunk line cable after being bypassed from a branching circuit to branch line terminal equipment connected to a branch line cable, and when trouble develops in the branch line, the optical signal is delivered to the trunk line cable via a short circuit. In the short circuit there is inserted an optical limiter amplifier which is capable of amplifying light of the first and second wavelength bands. Normally the optical limiter amplifier is saturated by control light of the second wavelength supplied from the branch line terminal equipment via the branch line cable, and consequently, the optical signal of the first wavelength band is suppressed. When the supply of the control light is stopped by some cause, the optical limiter amplifier amplifies the optical signal of the wavelength band provided to the short circuit and provides the amplified optical signal to the trunk line cable.
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