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。

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.

公开(公告)号：US07589888B2

公开(公告)日：2009-09-15

申请号：US11364157

申请日：2006-02-28

申请人： Shinichi Aozasa ,  Hiroji Masuda ,  Makoto Shimizu

发明人： Shinichi Aozasa ,  Hiroji Masuda ,  Makoto Shimizu

IPC分类号： H04B10/17 ,  H04B10/12

CPC分类号： H04B10/296 ,  H01S3/005 ,  H01S3/0064 ,  H01S3/0078 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/094011 ,  H01S3/094023 ,  H01S3/10007 ,  H01S3/10023 ,  H01S3/1301 ,  H01S3/1302 ,  H01S3/131 ,  H01S3/1616 ,  H01S3/2383

摘要： An optical amplifier includes a rare-earth doped optical fiber or rare-earth doped optical waveguide serving as an amplification medium where rare-earth ions have been doped in its core and/or clad, an excitation mechanism for exciting the amplification medium, and a plurality of optical resonator that causes laser oscillation at a plurality of wavelengths of amplified spontaneous emission light produced in the amplification medium.

摘要翻译： 光放大器包括稀土掺杂光纤或稀土掺杂光波导，其用作在其核和/或包层中掺杂稀土离子的放大介质，用于激发放大介质的激发机制，以及 多个光谐振器，其在放大介质中产生的放大的自发发射光的多个波长处引起激光振荡。

公开(公告)号：US07538937B2

公开(公告)日：2009-05-26

申请号：US11364633

申请日：2006-02-28

申请人： Shinichi Aozasa ,  Hiroji Masuda ,  Makoto Shimizu

发明人： Shinichi Aozasa ,  Hiroji Masuda ,  Makoto Shimizu

IPC分类号： H04B10/17 ,  H04B10/12

CPC分类号： H04B10/296 ,  H01S3/005 ,  H01S3/0064 ,  H01S3/0078 ,  H01S3/06754 ,  H01S3/06758 ,  H01S3/094011 ,  H01S3/094023 ,  H01S3/10007 ,  H01S3/10023 ,  H01S3/1301 ,  H01S3/1302 ,  H01S3/131 ,  H01S3/1616 ,  H01S3/2383

摘要： An optical amplifier includes a rare-earth doped optical fiber or rare-earth doped optical waveguide serving as an amplification medium where rare-earth ions have been doped in its core and/or clad, an excitation mechanism for exciting the amplification medium, an optical resonator that causes laser oscillation at one or more wavelength of spontaneous emission light produced and amplified in the amplification medium, a monitoring mechanism that monitors a power of at least one light selected from a power of at least one light with at least one prescribed wavelength band selected from the light inputted to the amplification medium and a power of at least one light selected from a power of at least one light with at least one prescribed wavelength band selected from the light outputted from the amplification medium, and a control unit that controls the excitation mechanism based on a value from monitoring mechanism.

摘要翻译： 光放大器包括稀土掺杂光纤或稀土掺杂光波导，其用作在其核和/或包层中掺杂稀土离子的放大介质，用于激发放大介质的激发机制，光学 谐振器，其在放大介质中产生和放大的自发发射光的一个或多个波长处引起激光振荡;监测机构，其监测从具有至少一个规定波长带的至少一个光的功率中选出的至少一个光的功率 从输入到放大介质的光中选择的光和从从放大介质输出的光中选择的至少一个规定波长带的至少一种光的功率中选择的至少一种光的功率;以及控制单元， 激励机制基于监测机制的价值。

公开(公告)号：US20080193136A1

公开(公告)日：2008-08-14

申请号：US10581327

申请日：2005-06-17

申请人： Hiroji Masuda ,  Kenji Sato ,  Yutaka Miyamoto

发明人： Hiroji Masuda ,  Kenji Sato ,  Yutaka Miyamoto

IPC分类号： H04J14/02

CPC分类号： H01S3/302 ,  H01S3/0078 ,  H01S3/06758 ,  H01S3/06766 ,  H01S3/0677 ,  H01S3/094011 ,  H01S3/0941 ,  H01S3/1608 ,  H01S2301/02 ,  H01S2301/04 ,  H04B10/294

摘要： An inline repeater that uses a forward-pumped DRA that can use a pumping light source such as an FBG pumping light source and a fiber laser, which are the most commonly used, and an optical fiber communication system are realized. The optical fiber communication system comprises silica fiber as a gain medium for Raman amplification to amplify a signal light; a pumping light source that emits a pumping light that co-propagates through the silica fiber in the same direction as the signal light; and a multiplexer disposed between the silica fiber and the pumping light source that multiplexes the signal light and the pumping light, with the multiplexer being provided with a means to multiplex the signal light input thereto having a wavelength longer than the zero-dispersion wavelength of the silica fiber and the pumping light emitted from the pumping light source, and the pumping light source being equipped with a means to emit pumping light, with the longest wavelength of the pumping light being shorter than the shortest wavelength of the signal light by a frequency difference on the low-frequency side of 13.7 to 30 THz.

摘要翻译： 实现了使用可以使用最常用的FBG泵浦光源和光纤激光器等泵浦光源的前向泵浦DRA和光纤通信系统的在线中继器。 光纤通信系统包括石英光纤作为用于拉曼放大的增益介质，用于放大信号光; 泵浦光源，其发射与所述信号光沿相同方向共同传播通过所述石英光纤的泵浦光; 以及多路复用器，其布置在二极管光纤和泵浦光源之间，多路复用信号光和泵浦光，多路复用器设置有多路复用输入到其上的信号光，该波长比该波长的零色散波长长 二氧化硅纤维和从泵浦光源发射的泵浦光，并且泵浦光源装备有发射泵浦光的装置，其中泵浦光的最长波长比信号光的最短波长短于频率差 在13.7到30 THz的低频侧。

公开(公告)号：US06721092B2

公开(公告)日：2004-04-13

申请号：US10079209

申请日：2002-02-20

申请人： Shinichi Aozasa ,  Hiroji Masuda ,  Tadashi Sakamoto ,  Makoto Shimizu ,  Yoshiki Nishida

发明人： Shinichi Aozasa ,  Hiroji Masuda ,  Tadashi Sakamoto ,  Makoto Shimizu ,  Yoshiki Nishida

IPC分类号： H01S300

CPC分类号： H01S3/06754 ,  H01S3/06708 ,  H01S3/06758 ,  H01S3/094003 ,  H01S3/094011 ,  H01S3/0941 ,  H01S3/1616 ,  H01S3/2333 ,  H01S2303/00

摘要： An optical fiber amplifier with a high conversion efficiency, which is capable of using the pump light in the wavelength band that can be emitted by the laser diode, is formed by an amplification optical fiber containing thulium at least in a core, to which a signal light is to be entered, and a pump light input unit configured to enter at least one pump light with a wavelength in a range of 1320-1520 nm, or more preferably 1320-1480 nm, into the amplification optical amplifier.

摘要翻译： 能够使用能够由激光二极管发射的波长带中的泵浦光的具有高转换效率的光纤放大器由至少在芯中包含th an的放大光纤形成，信号 进入光，泵浦光输入部被配置为将至少一个波长在1320-1520nm，更优选1320-1480nm的泵浦光输入到放大光放大器中。

公开(公告)号：US07920793B2

公开(公告)日：2011-04-05

申请号：US10581327

申请日：2005-06-17

申请人： Hiroji Masuda ,  Kenji Sato ,  Yutaka Miyamoto

发明人： Hiroji Masuda ,  Kenji Sato ,  Yutaka Miyamoto

IPC分类号： H04J14/02

CPC分类号： H01S3/302 ,  H01S3/0078 ,  H01S3/06758 ,  H01S3/06766 ,  H01S3/0677 ,  H01S3/094011 ,  H01S3/0941 ,  H01S3/1608 ,  H01S2301/02 ,  H01S2301/04 ,  H04B10/294

摘要： An inline repeater that uses a forward-pumped DRA that can use a pumping light source such as an FBG pumping light source and a fiber laser, which are the most commonly used, and an optical fiber communication system are realized. The optical fiber communication system comprises silica fiber as a gain medium for Raman amplification to amplify a signal light; a pumping light source that emits a pumping light that co-propagates through the silica fiber in the same direction as the signal light; and a multiplexer disposed between the silica fiber and the pumping light source that multiplexes the signal light and the pumping light, with the multiplexer being provided with a means to multiplex the signal light input thereto having a wavelength longer than the zero-dispersion wavelength of the silica fiber and the pumping light emitted from the pumping light source, and the pumping light source being equipped with a means to emit pumping light, with the longest wavelength of the pumping light being shorter than the shortest wavelength of the signal light by a frequency difference on the low-frequency side of 13.7 to 30 THz.

摘要翻译： 实现了使用可以使用最常用的FBG泵浦光源和光纤激光器等泵浦光源的前向泵浦DRA和光纤通信系统的在线中继器。 光纤通信系统包括石英光纤作为用于拉曼放大的增益介质，用于放大信号光; 泵浦光源，其发射与所述信号光沿相同方向共同传播通过所述石英光纤的泵浦光; 以及多路复用器，其布置在二极管光纤和泵浦光源之间，多路复用信号光和泵浦光，多路复用器设置有多路复用输入到其上的信号光，该波长比该波长的零色散波长长 二氧化硅纤维和从泵浦光源发射的泵浦光，并且泵浦光源装备有发射泵浦光的装置，其中泵浦光的最长波长比信号光的最短波长短于频率差 在13.7到30 THz的低频侧。

公开(公告)号：US06583924B2

公开(公告)日：2003-06-24

申请号：US10187732

申请日：2002-06-27

申请人： Hiroji Masuda ,  Junichi Kani ,  Noboru Takachio

发明人： Hiroji Masuda ,  Junichi Kani ,  Noboru Takachio

IPC分类号： H04B1012

CPC分类号： H04B10/294 ,  H04B2210/258

摘要： In the optical amplifier an optical divider based on long wavelength (or short wavelength) transmission type dielectric multi-layer filter divides input signal light according to wavelengths, and amplifying sections disposed in parallel and having different respective wavelength amplification regions respectively amplify light signals emitted from the optical divider, and an optical combiner based on long wavelength (or short wavelength) transmission type dielectric multi-layer filter combines light signals output from the respective amplifying sections. In another configuration of the optical amplifier, input signal light is divided using an optical divider based on a dielectric multi-layer filter of a long wavelength (or short wavelength) transmission type, and output signals from the divider are filtered using an optical filter connected in series to a short wavelength (or long wavelength) amplifier generating a loss in the long wavelength (or short wavelength) region of the light signals. Interference noise caused by residual reflection components in the dielectric multi-layer filter is thus suppressed, thereby increasing the bandwidth of useable wavelengths in the signal light.

公开(公告)号：US06172803B2

公开(公告)日：2001-01-09

申请号：US09171409

申请日：1998-10-16

申请人： Hiroji Masuda ,  Shingo Kawai ,  Kenichi Suzuki ,  Kazuo Aida

发明人： Hiroji Masuda ,  Shingo Kawai ,  Kenichi Suzuki ,  Kazuo Aida

IPC分类号： H01S300

CPC分类号： H04B10/2912 ,  H01S3/06758 ,  H01S3/094003 ,  H01S3/094011 ,  H01S3/094096 ,  H01S3/1608 ,  H01S3/302 ,  H01S2301/04 ,  H04B10/291 ,  H04B10/2916 ,  H04B10/2941 ,  H04B2210/003

摘要： An optical amplifier having a two-stage construction using an erbium doped fiber (EDF) as a gain medium. The erbium dopant concentration is 1000 ppm, and the unsaturated absorption coefficient of the signal beam at 1550 nm is 1 dB/m. The length of the EDF 14-8 is 10 m, and the length of the EDF 14-12 is 70 m. The excitation light sources 14-6 and 14-10 are semiconductor lasers of 1.53 &mgr;m, and the excitation light power is 100 mW. Multiplexers 14-7 and 14-11 are inductive multi-layer film filters, and the gain equalizer 14-4 is a Fourier filter. The peak loss of the Fourier filter is 17 dB. The gain of the EDF 14-8 is 25 dB, and the gain of the EDF 14-12 is 15 dB. Two optical isolators are installed on a pre-stage amplifier, and one on a post-stage amplifier in order to prevent laser oscillation.

摘要翻译： 一种具有使用掺铒光纤（EDF）作为增益介质的两级结构的光放大器。 铒掺杂剂浓度为1000ppm，1550nm处的信号束的不饱和吸收系数为1dB / m。 EDF14-8的长度为10μm，EDF14-12的长度为70μm。 激发光源14-6和14-10是1.53μm的半导体激光器，激发光功率为100mW。 多路复用器14-7和14-11是感性多层膜滤波器，增益均衡器14-4是傅立叶滤波器。 傅立叶滤波器的峰值损耗为17 dB。 EDF 14-8的增益为25 dB，EDF 14-12的增益为15 dB。 两个光隔离器安装在前级放大器上，一个安装在后级放大器上，以防止激光振荡。

公开(公告)号：US07379236B2

公开(公告)日：2008-05-27

申请号：US10552554

申请日：2004-07-05

申请人： Hiroji Masuda ,  Hiroto Kawakami ,  Yutaka Miyamoto

发明人： Hiroji Masuda ,  Hiroto Kawakami ,  Yutaka Miyamoto

IPC分类号： H01S4/00 ,  H04B10/12

CPC分类号： H04B10/291 ,  H04B2210/003

摘要： An optical fiber communication system is provided which uses remote pumping that is capable of improving pumping efficiency and reducing a noise figure. A coupler (20) of a linear repeater (18) couples signal light to pumping light outputted from a pumping light source (19). The outputted signal light and pumping light reach a linear repeater (25) through transmission fibers (22 to 24) and remote pumping modules (27F and 27R). A coupler (30) of the linear repeater (25) couples the signal light to the pumping light supplied from a pumping light source (29), to output the signal light and the pumping light to the transmission fiber (24). The remote pumping module (27F) divides the pumping light propagated in the transmission fiber (22), from the signal light. The remote pumping module 27F branches the divided pumping light in two directions with a predetermined ratio. After branching, each of the branched pumping light is coupled to the signal light to be supplied to both ends of an erbium-doped fiber. The remote pumping module (27R) is similar in structure to the remote pumping module (27F).

摘要翻译： 提供了一种使用能够提高泵送效率并降低噪声系数的远程泵送的光纤通信系统。 线性中继器（18）的耦合器（20）将信号光耦合到从泵浦光源（19）输出的泵浦光。 输出的信号光和泵浦光通过传输光纤（22至24）和远程泵送模块（27F和27R）到达线性中继器（25）。 线性中继器（25）的耦合器（30）将信号光耦合到从泵浦光源（29）提供的泵浦光，以将信号光和泵浦光输出到传输光纤（24）。 远程泵送模块（27F）将在传输光纤（22）中传播的泵浦光与信号光分开。 远程泵送模块27F以预定比例在两个方向上分支分开的泵浦光。 在分支之后，每个分支泵浦光耦合到要提供给掺铒光纤两端的信号光。 远程泵送模块（27R）在结构上类似于远程泵送模块（27F）。