公开(公告)号：US07050220B2

公开(公告)日：2006-05-23

申请号：US10826631

申请日：2004-04-15

申请人： Takayuki Miyakawa ,  Yasuyuki Nagao

发明人： Takayuki Miyakawa ,  Yasuyuki Nagao

IPC分类号： H01S3/00

CPC分类号： H04B10/0731

摘要： In a Raman gain measuring method according to the invention, a CW (continuous wave) probe light is input into a Raman amplifying medium. A Raman pumping light being binary-intensity-modulated at a modulation factor is generated. The Raman pumping light is input into the Raman amplifying medium. Two index values regarding to AC component and DC component are extracted from the probe light having propagated through the Raman amplifying medium. The Raman gain of the Raman amplifying medium is determined from the two index values and the modulation factor.

摘要翻译： 在根据本发明的拉曼增益测量方法中，将CW（连续波）探测光输入到拉曼放大介质中。 产生以调制因子进行二进制强度调制的拉曼泵浦光。 拉曼泵浦光被输入到拉曼放大介质中。 从传播通过拉曼放大介质的探测光中提取关于AC分量和DC分量的两个指标值。 从两个指标值和调制因子确定拉曼放大介质的拉曼增益。

公开(公告)号：US06519078B2

公开(公告)日：2003-02-11

申请号：US09887915

申请日：2001-06-21

申请人： Takayuki Miyakawa ,  Noboru Edagawa ,  Masatoshi Suzuki

发明人： Takayuki Miyakawa ,  Noboru Edagawa ,  Masatoshi Suzuki

IPC分类号： H01S330

CPC分类号： H01S3/302

摘要： The object of this invention is to improve SNR in the Raman amplification. An optical fiber (10) consists of a dispersion shift fiber in which a zero dispersion wavelength is shifted to the 1.55 &mgr;m band, and an optical fiber (12) consists of a single mode optical fiber having the effective core area of 100 &mgr;m2 which is larger than that of the optical fiber (10). An optical coupler 14 is disposed at the optical signal emission end of the optical fiber (12). A laser diode (16) outputs the laser light of 1455 nm as a Raman pumping light source. The output light from the laser diode (16) is introduced into the optical fiber (12) from the back, namely in the opposite direction to that of the optical signal propagation. The ratio of the Raman gain coefficient of the optical fiber (12) to that of the optical fiber (11) should be 1/1.08 or less, preferably 1/1.1 or less.

公开(公告)号：US5920413A

公开(公告)日：1999-07-06

申请号：US833097

申请日：1997-04-04

申请人： Takayuki Miyakawa ,  Hidenori Taga ,  Shu Yamamoto ,  Shigeyuki Akiba

发明人： Takayuki Miyakawa ,  Hidenori Taga ,  Shu Yamamoto ,  Shigeyuki Akiba

IPC分类号： G02B27/28 ,  G02B6/293 ,  H04B10/07 ,  H04B10/2507 ,  H04B10/27 ,  H04B10/29 ,  H04J14/00 ,  H04J14/02

CPC分类号： H04J14/0201 ,  H04J14/0206

摘要： An optical add/drop multiplexing scheme capable of reducing the degradation of the transmission characteristic due to the beat noises caused by the interference of the fiber grating leakage components. An optical add/drop multiplexing device is formed by a high speed polarization scrambler for entering signal lights with a data modulation at a high speed bit rate applied thereto, and scrambling polarization states of entered signal lights at high speed, and an optical add/drop element for receiving the signal lights with the polarization states scrambled by the high speed polarization scrambler, and carrying out an add/drop multiplexing operation for signal lights in a specific wavelength among received signal lights. The high speed polarization scrambler scrambles the polarization states of the entered signal lights so as to lower a probability for having worst polarization states of signal lights and interference lights, by scrambling the polarization states of the entered signal lights into every possible polarization states at nearly equal probabilities.

摘要翻译： 一种能够降低由于光纤光栅泄漏部件的干扰引起的节拍噪声导致的传输特性劣化的光分插复用方案。 通过高速偏振加扰器形成光分插多路复用装置，用于以高速比特率对数据调制进入信号光，并以高速加扰输入的信号光的偏振状态，以及光分插 用于接收具有由高速偏振加扰器加扰的偏振状态的信号光的元件，并对接收到的信号光中的特定波长的信号光进行分插复用操作。 高速极化扰频器对输入的信号光的极化状态加扰，从而通过将输入的信号光的偏振状态加扰到几乎相等的每个可能的极化状态，降低具有信号光和干涉光的最差极化状态的概率 概率

公开(公告)号：US5912750A

公开(公告)日：1999-06-15

申请号：US779780

申请日：1997-01-07

申请人： Noriyuki Takeda ,  Takayuki Miyakawa ,  Hidenori Taga ,  Shigeyuki Akiba ,  Shu Yamamoto

发明人： Noriyuki Takeda ,  Takayuki Miyakawa ,  Hidenori Taga ,  Shigeyuki Akiba ,  Shu Yamamoto

IPC分类号： G02B6/02 ,  H04J14/00 ,  H04J14/02

CPC分类号： H04J14/0221

摘要： Wavelength multiplexed optical signals which are input into a first optical amplifier from an optical transmission terminal device over an optical fiber are differently amplified in respective wavelengths due to unevenness of gain of the optical amplifiers and then output. By providing M-transmission optical filters having an M-type transmission characteristic to cancel gain deviation of the optical amplifiers in respective wavelengths, a flat gain characteristic can be achieved even after the optical signals are transmitted via a plurality of optical amplifiers and a plurality of M-transmission optical filters. Also, by removing ASE in a wavelength range of 1.53 .mu.m which prevents signal amplification in a wavelength range of 1.55 .mu.m, the wavelength multiplexed optical signals which are sufficiently amplified can be transmitted to an optical reception terminal device over the optical fiber.

摘要翻译： 通过光纤从光传输终端装置输入到第一光放大器中的波分复用光信号由于光放大器的增益不均匀而在各波长中不同地被放大，然后被输出。 通过提供具有M型传输特性的M传输光学滤波器来消除各个波长的光放大器的增益偏差，即使在通过多个光放大器传输光信号和多个光放大器之后，也可以获得平坦的增益特性 M型传输滤光片。 此外，通过在1.53μm的波长范围内去除ASE，防止在1.55μm的波长范围内的信号放大，可以充分放大的波长复用光信号可以通过光纤传输到光接收终端装置。

公开(公告)号：US06748178B2

公开(公告)日：2004-06-08

申请号：US09795245

申请日：2001-02-26

申请人： Takayuki Miyakawa ,  Masatoshi Suzuki ,  Noboru Edagawa

发明人： Takayuki Miyakawa ,  Masatoshi Suzuki ,  Noboru Edagawa

IPC分类号： H04B1018

CPC分类号： H04B10/2916 ,  H04B2210/003

摘要： An optical fiber (12a) with a large effective core area and a large chromatic dispersion value is disposed on an input side of signal light, and an optical fiber (12b) with a small effective core area and a small chromatic dispersion value or a chromatic dispersion value of negative polarity is disposed on an output side of the signal light. A pumping light source (14) generates pumping light of 1450 nm to cause Raman amplification of 1550 nm in the optical fiber (12b). The output light from the pumping light source (14) enters the optical fiber (12b) from the back through a WDM optical coupler (16). Provided that y=(Pin−&agr;)/(Pp·10 Log L) where input power of the optical fiber (12a) (i.e. output power of an optical transmitter (10)) is Pin, a total loss of the optical fibers (12a and 12b) is &agr;, pumping power for Raman amplification is Pp, and a total length of the optical fibers (12a and 12b) is L, the relation between ratio x (0≦x≦1) of the optical fiber (12b) and y is expressed as y=6.63×10−2x−0.077. Here, the satisfactory x value is in a range from +0.2 to −0.2 of the y value.

摘要翻译： 具有大的有效核​​心面积和大的色散值的光纤（12a）被布置在信号光的输入侧，并且具有小的有效核心区域和小的色散值或色度的光纤（12b） 负极性的色散值被设置在信号光的输出侧。 泵浦光源（14）产生1450nm的泵浦光，以在光纤（12b）中引起1550nm的拉曼放大。 来自泵浦光源（14）的输出光通过WDM光耦合器（16）从后面进入光纤（12b）。 假设光纤（12a）的输入功率（即，光发射器（10）的输出功率））为Pin的y =（Pin-alpha）/（Pp.10Log L），光纤的总损耗 12a和12b）为α，用于拉曼放大的泵送功率为Pp，光纤（12a和12b）的总长度为L，光纤的比例x（0 <= x <= 1） 12b），y表示为y = 6.63×10 -2 x-0.077。 这里，满意的x值在y值的+0.2〜-0.2的范围内。

公开(公告)号：US5926300A

公开(公告)日：1999-07-20

申请号：US797393

申请日：1997-02-10

申请人： Takayuki Miyakawa ,  Hidenori Taga ,  Shu Yamamoto ,  Shigeyuki Akiba

发明人： Takayuki Miyakawa ,  Hidenori Taga ,  Shu Yamamoto ,  Shigeyuki Akiba

IPC分类号： G02B27/10 ,  G02B6/34 ,  G02B27/28 ,  H04B10/07 ,  H04B10/2507 ,  H04B10/27 ,  H04B10/29 ,  H04J14/02

CPC分类号： G02B6/2932 ,  G02B6/29383 ,  H04J14/0201 ,  H04J14/0206 ,  H04J14/0213

摘要： The present invention is directed towards an optical ADM apparatus provided with a narrow band-pass filter which is capable of minimizing declination of the transmission characteristics. An optical transmission prohibiting element composed of an optical isolator and a fiber grating is connected in series to the downstream of a fiber grating interposed between two optical circulators. The drop light is reflected by the fiber grating and released from an output optical fiber of the optical circulator. A leak component of the drop light having passed through the fiber grating appears on the side of the isolator and runs across the isolator to the other fiber grating. Most of the leak component is however reflected by the fiber grating while its small portion enters the optical circulator via the fiber grating. The small portion of the leak component is as small as negligible and will hardly interfere with the add light. The optical transmission prohibiting element may be an optical circulator.

摘要翻译： 本发明涉及一种具有窄带通滤波器的光学ADM装置，其能够最小化传输特性的偏差。 由光隔离器和光纤光栅构成的光传输禁止元件串联连接到插入在两个光循环器之间的光纤光栅的下游。 该光束由光纤光栅反射并从光环行器的输出光纤中释放。 穿过光纤光栅的液滴光的泄漏分量出现在隔离器的侧面，并穿过隔离器到另一个光纤光栅。 然而，大多数泄漏分量反射光纤光栅，而其小部分通过光纤光栅进入光环行器。 泄漏部件的一小部分可以忽略不计，几乎不会妨碍加光。 光传输禁止元件可以是光循环器。

公开(公告)号：US5822095A

公开(公告)日：1998-10-13

申请号：US702274

申请日：1996-08-23

申请人： Hidenori Taga ,  Takayuki Miyakawa ,  Shigeyuki Akiba

发明人： Hidenori Taga ,  Takayuki Miyakawa ,  Shigeyuki Akiba

IPC分类号： H04J14/00 ,  G02B6/293 ,  G02B6/34 ,  H04B10/2507 ,  H04B10/27 ,  H04B10/29 ,  H04J14/02 ,  H04L12/40 ,  H04Q11/00

CPC分类号： H04Q11/0003 ,  G02B6/29361 ,  G02B6/29362 ,  G02B6/29383 ,  H04J14/0206 ,  H04J14/0213 ,  H04Q2011/0009 ,  H04Q2011/0015 ,  H04Q2011/0035

摘要： An object of the present invention is to provide an optical add-drop multiplexer capable of giving improved characteristics with a simple, inexpensive arrangement which needs not a corresponding number of optical bandpass filters to the wavelength components of a light signal to be carried. The wavelength components .lambda.1 to .lambda.n of an input n-wave signal is received by an input optical fiber and transmitted through an optical circulator and an optical fiber to an optical bandpass filter which allows a specific wavelength .lambda.1 to pass but rejects the other wavelengths .lambda.2 to .lambda.n. While the rejected wavelengths .lambda.2 to .lambda.n are returned back to the optical fiber, the specific wavelength .lambda.1 runs through another optical fiber and another optical circulator and then is dropped from an output optical fiber. Meanwhile, another signal component of the wavelength .lambda.1 is added and introduced from another input optical fiber through the another optical circulator and the another optical fiber to the optical bandpass filter. Upon the added wavelength .lambda.1 having passed the optical bandpass filter and entering the optical fiber, it is mixed with the rejected wavelengths .lambda.2 to .lambda.n. A resultant sum signal of the full wavelengths .lambda.1 to .lambda.n is passed through the optical circulator and transmitted from an output optical fiber.

摘要翻译： 本发明的一个目的是提供一种光分插复用器，其能够以简单且便宜的布置提供改进的特性，其不需要相对数量的光带通滤波器到待承载的光信号的波长分量。 输入n波信号的波长分量λ1至λn由输入光纤接收，并通过光环行器和光纤传输到允许特定波长λ1通过但拒绝其他的光学带通滤波器 波长λ2到λn。 当被拒绝的波长λ2到λn返回到光纤时，特定波长λ1穿过另一个光纤和另一个光环行器，然后从输出光纤中掉落。 同时，波长λ1的另一个信号分量从另一个输入光纤通过另一光环行器和另一光纤引入光带通滤波器。 当经过光带通滤波器并进入光纤的附加波长λ1时，将其与被拒绝的波长λ2与λn混合。 全波长λ1至λn的合成和信号通过光环行器并从输出光纤传输。