公开(公告)号：US07061664B2

公开(公告)日：2006-06-13

申请号：US10688197

申请日：2003-10-17

申请人： Osamu Aso ,  Shu Namiki ,  Kouki Sato ,  Hijiri Nimura

发明人： Osamu Aso ,  Shu Namiki ,  Kouki Sato ,  Hijiri Nimura

IPC分类号： G02F1/365 ,  G02F1/39

CPC分类号： H04B10/299 ,  G02F1/3536 ,  G02F2/004 ,  H04B10/2563 ,  H04J14/02 ,  H04J14/0201 ,  H04J14/0213

摘要： A wavelength converter using difference frequency generation (DFG) is disclosed. In one embodiment, the wavelength converter comprises (a) a first optical filter configured to filter out one or more lightwaves requiring wavelength conversion from wavelength-division multiplexed (WDM) lightwaves, and (b) a broadband multi-channel simultaneous wavelength conversion portion comprising a pump source that generates pump light for use in the process of the DFG, a first optical combiner for combining said pump light with said filtered lightwaves, a high non-linear medium configured to generate wavelength converted lightwaves from said filtered lightwaves using the DFG, and a second optical filter for filtering said wavelength converted from said filtered lightwaves.

摘要翻译： 公开了使用差频产生（DFG）的波长转换器。 在一个实施例中，波长转换器包括（a）第一滤光器，被配置为从波分复用（WDM）光波滤出需要波长转换的一个或多个光波，以及（b）宽带多通道同时波长转换部分，包括 产生用于DFG过程中的泵浦光的泵浦源，用于将所述泵浦光与所述经滤波的光波组合的第一光合并器，配置为使用所述DFG从所述滤波的光波产生波长转换的光波的高非线性介质， 以及第二滤光器，用于对从所述滤波光波转换的所述波长进行滤波。

公开(公告)号：US06665113B2

公开(公告)日：2003-12-16

申请号：US09750535

申请日：2000-12-28

申请人： Osamu Aso ,  Shu Namiki ,  Kouki Sato ,  Hijiri Nimura

发明人： Osamu Aso ,  Shu Namiki ,  Kouki Sato ,  Hijiri Nimura

IPC分类号： G02F200

CPC分类号： H04B10/299 ,  G02F1/3536 ,  G02F2/004 ,  H04B10/2563 ,  H04J14/02 ,  H04J14/0201

摘要： Solely lightwaves required to be wavelength converted are filtered out from the input broadband WDM lightwaves and are wavelength converted by use of FWM. Not only the broadband simultaneous wavelength conversion that is studied by many researchers, but also more flexible, sub-band wavelength conversion is realized. Frequency interval of the input WDM lightwaves is broadened or reduced in comparison of the frequency interval of the WDM lightwaves inputted to the wavelength converter. The frequency interval variation techniques using the wavelength converter, it can be realized to transfer from a transmission line less influenced by inter-channel crosstalk due to FWM to the different transmission lines strongly influenced by inter-channel crosstalk due to FWM, and vice versa.

摘要翻译： 需要进行波长转换的唯一光波从输入宽带WDM光波中滤出，并通过使用FWM进行波长转换。 不仅实现了许多研究人员研究的宽带同时波长转换，而且实现了更灵活的子带波长转换。 与输入到波长转换器的WDM光波的频率间隔相比，输入WDM光波的频率间隔变宽或减小。 使用波长转换器的频率间隔变化技术可以实现从由于FWM而受到由信道间串扰的较少影响的传输线传输到由FWM引起的由信道间串扰强烈影响的不同传输线路，反之亦然。

公开(公告)号：US5329348A

公开(公告)日：1994-07-12

申请号：US955367

申请日：1992-10-05

申请人： Hijiri Nimura ,  Akira Fujisaki ,  Kazunori Nakamura ,  Haruki Ohgoshi

发明人： Hijiri Nimura ,  Akira Fujisaki ,  Kazunori Nakamura ,  Haruki Ohgoshi

IPC分类号： G01M11/08 ,  G02B6/44 ,  G01N21/84 ,  G01N21/21

CPC分类号： G01M11/088 ,  G02B6/447

摘要： There is provided a method of identifying a particular optical cable out of a plurality of similar optical cables in a simple, quick and accurate manner without requiring any significant additional cost. For identifying a particular optical cable C2 out of a plurality of optical cables C1 through C3 by means of a means for transmitting optical signals 11, a signal receiving/detecting means 13 and a signal applying device 16 and by utilizing the fluctuation in the level of optical signal due to the photoelastic effect that appears when external signals are applied to a cable carrying an optical signal, external signals are applied to the outer peripheral surface of each of the optical cable at a plurality of spots to boost the level of fluctuation of optical signal so that the particular optical cable can be identified without fail. Thus, the method of the present invention can be used to identify a particular optical cable out of a plurality of similar optical cables in an accurate and reliable manner by using a simple means of applying external signals.

摘要翻译： 提供了一种以简单，快速和准确的方式从多个类似光缆中识别特定光缆的方法，而不需要任何显着的额外成本。 为了通过用于发送光信号11的装置，信号接收/检测装置13和信号施加装置16，通过利用多个光缆C1至C3的电平的波动来识别多个光缆C1至C3中的特定光缆C2 光信号由于当外部信号被施加到承载光信号的电缆时出现的光弹效应，外部信号在多个点被施加到每个光缆的外周表面以提高光学波动的水平 信号，使得可以识别出特定的光缆。 因此，本发明的方法可以用于通过使用外部信号的简单方法以精确和可靠的方式从多个类似的光缆中识别特定的光缆。

公开(公告)号：US06198570B1

公开(公告)日：2001-03-06

申请号：US09259305

申请日：1999-03-01

申请人： Masaru Fukushima ,  Haruki Ogoshi ,  Hijiri Nimura

发明人： Masaru Fukushima ,  Haruki Ogoshi ,  Hijiri Nimura

IPC分类号： G02B628

CPC分类号： H04B10/2941 ,  H01S3/10023 ,  H01S2301/06

摘要： A method of manufacturing an optical filter that can restrain the wavelength dependence of the gain of an optical amplifier. The input signal light power, output power of pump light source (8), and the output signal light power of an optical amplifier (4) are set to the power values used for optical communication systems, and the total power of the simulation input light of a plurality of wavelengths (&lgr;1, &lgr;2, . . . &lgr;n) from light sources (1a) and an input light (probe light) from light sources (1m) are set equal to the total power of the input signals of a plurality of wavelengths used in wavelength division multiplex transmission systems. In this condition, the input light are multiplexed and are launched into optical amplifier (4), and the amount of attenuation is variably adjusted so that the output power from optical amplifier (4) in correspondence to the probe light will be within the range determined by the maximum and minimum of the output power corresponding to the simulation input light to determine the attenuation amount corresponding to the wavelength of the probe light. The above operation is repeated upon varying the wavelength of the probe light, and loss spectrum of the optical filter is set to the loss spectrum of the attenuation amounts in one-to-one correspondence with the respective wavelengths.

摘要翻译： 一种制造可以抑制光放大器的增益的波长依赖性的滤光器的方法。 输入信号光功率，泵浦光源的输出功率（8）和光放大器（4）的输出信号光功率被设置为用于光通信系统的功率值，并且模拟输入光的总功率 来自光源（1a）的多个波长（lambd1，lambd2，... lambdn）和来自光源（1m）的输入光（探测光）被设置为等于多个 用于波分复用传输系统的波长。 在这种情况下，输入光被多路复用并被发射到光放大器（4）中，并且可变地调整衰减量，使得来自光放大器（4）的对应于探测光的输出功率将在确定的范围内 通过对应于模拟输入光的输出功率的最大和最小来确定对应于探测光的波长的衰减量。 在改变探测光的波长时重复上述操作，并且将滤光器的损耗光谱设置为与各个波长一一对应的衰减量的损耗谱。

公开(公告)号：US5808768A

公开(公告)日：1998-09-15

申请号：US570774

申请日：1995-12-12

申请人： Masateru Tadakuma ,  Masahito Morimoto ,  Hijiri Nimura ,  Haruki Ogoshi

发明人： Masateru Tadakuma ,  Masahito Morimoto ,  Hijiri Nimura ,  Haruki Ogoshi

IPC分类号： G01C19/66 ,  G02F1/01 ,  H01S3/06 ,  H01S3/067 ,  H01S3/07 ,  H01S3/083 ,  H01S3/10 ,  H01S3/17 ,  H04B10/516 ,  H04B10/548 ,  H04B10/588 ,  H04B10/61 ,  H04B10/00

CPC分类号： H04B10/532

摘要： There is provided an optical telecommunications method that can externally modulate a plane of polarization without producing any null point. According to the invention, in an optical telecommunications system for externally modulating the plane of polarization of the light being transmitted through an optical fiber for the transmission of a polarized wave signal by externally applying a signal to modify the state of polarization, the source of light for the transmission of a polarized wave signal is a fiber ring laser.

摘要翻译： 提供了可以在不产生任何空点的情况下从外部调制偏振平面的光通信方法。 根据本发明，在用于通过外部施加信号以改变偏振状态的外部调制通过光纤传输的光的偏振平面用于透射偏振波信号的光通信系统中，光源 用于传输偏振波信号是光纤环形激光器。

公开(公告)号：US5933552A

公开(公告)日：1999-08-03

申请号：US997409

申请日：1997-12-23

申请人： Masaru Fukushima ,  Haruki Ogoshi ,  Hijiri Nimura

发明人： Masaru Fukushima ,  Haruki Ogoshi ,  Hijiri Nimura

IPC分类号： H01S3/10 ,  H04B10/17 ,  G02B6/28

CPC分类号： H04B10/2941 ,  H01S3/10023 ,  H01S2301/06

摘要： A method of manufacturing an optical filter that can restrain the wavelength dependence of the gain of an optical amplifier. The input signal light power, output power of pump light source (8), and the output signal light power of an optical amplifier (4) are set to the power values used for optical communication systems, and the total power of the simulation input light of a plurality of wavelengths (.lambda.1, .lambda.2, . . . .lambda.n) from light sources (1a) and an input light (probe light) from light sources (1m) are set equal to the total power of the input signals of a plurality of wavelengths used in wavelength division multiplex transmission systems. In this condition, the input light are multiplexed and are launched into optical amplifier (4), and the amount of attenuation from light source (1m) to the input end (14) of optical amplifier (4) is variably adjusted so that the output power from optical amplifier (4) in correspondence to the probe light will be within the range determined by the maximum and minimum of the output power corresponding to the simulation input light to determine the attenuation amount corresponding to the wavelength of the probe light. The above operation is repeated upon varying the wavelength of the probe light, and loss spectrum of the optical filter is set to the loss spectrum of the attenuation amounts in one-to-one correspondence with the respective wavelengths.

摘要翻译： 一种制造可以抑制光放大器的增益的波长依赖性的滤光器的方法。 输入信号光功率，泵浦光源的输出功率（8）和光放大器（4）的输出信号光功率被设置为用于光通信系统的功率值，并且模拟输入光的总功率 来自光源（1a）的多个波长（λ1，λ2，...λn）和来自光源（1m）的输入光（探测光）被设置为等于输入信号的总功率 在波分复用传输系统中使用的多个波长。 在这种情况下，输入光被多路复用并发射到光放大器（4）中，并且可变地调节从光源（1m）到光放大器（4）的输入端（14）的衰减量，使得输出 来自光放大器（4）的对应于探测光的功率将在由与模拟输入光相对应的输出功率的最大值和最小值确定的范围内，以确定与探测光的波长对应的衰减量。 在改变探测光的波长时重复上述操作，并且将滤光器的损耗光谱设置为与各个波长一一对应的衰减量的损耗谱。

公开(公告)号：US5576871A

公开(公告)日：1996-11-19

申请号：US449945

申请日：1995-05-25

申请人： Hijiri Nimura ,  Akira Fujisaki ,  Haruki Ohgoshi

发明人： Hijiri Nimura ,  Akira Fujisaki ,  Haruki Ohgoshi

IPC分类号： H04B10/07 ,  H04B10/079 ,  H04B10/2507 ,  H04B10/524 ,  H04B10/54 ,  H04B10/08

CPC分类号： H04B10/07

摘要： There is provided a method for optical telecommunications with which an optical signal modulated for the plane of polarization can be received for certain without lowering the threshold level and being affected by noises so that any optical telecommunications can be identified without fail. With the method, an optical signal is modulated by continuous pulses a at the transmitting side before transmission and a predetermined number (n) of pulses a are extracted within a given period of time in synchronism at the receiving side so that the presence of a modulated optical signal is acknowledged only when the number of pulses a received within the given period of time is smaller than the predetermined number (n) but greater than another predetermined number (m) (n.gtoreq.m). This method may be so modified that the absence of a modulated optical signal is acknowledged even when the above defined number of pulses are received if k or more than k (k.gtoreq.1) noise signals b are found between any successive two of the received pulses.

摘要翻译： 提供了一种用于光通信的方法，通过该方法可以在不降低阈值水平并且受噪声影响的情况下接收用于偏振平面调制的光信号，从而可以无故障地识别任何光通信。 利用该方法，在发送之前在发送侧的连续脉冲a调制光信号，并且在给定时间段内在接收侧同步地提取预定数量（n）个脉冲a，使得存在调制 光信号仅在给定时间内接收的脉冲数α小于预定数（n）但大于另一预定数（m）（n> / = m）时才被确认。 该方法可以如此修改，即使当接收到上述定义数量的脉冲时，如果在任何连续两个之间发现k个或更多个k（k> / = 1）个噪声信号b，则确认不存在调制光信号 接收脉冲。