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41. 发明授权

US08073339B2 Optical device, optical modulation method, and optical transmitter 有权
公开(公告)号：US08073339B2
公开(公告)日：2011-12-06
申请号：US12219860
申请日：2008-07-29
申请人： Masato Nishihara , Tomoo Takahara , Toshiki Tanaka
发明人： Masato Nishihara , Tomoo Takahara , Toshiki Tanaka
IPC分类号： H04B10/04
摘要： An optical modulation device including waveform shapers that waveform-shape input data signals in synchronism with a rising or falling timing based on comparison with a reference level of an input clock signal, a multi-level phase modulator that generates a multi-level-phase-modulated optical signal based on the data signals waveform-shaped by the plurality of waveform shapers, and outputs the generated optical signal, and a level ratio controller that varies a relative level ratio of the reference level to an amplitude level of the clock signal input to the waveform shapers, based on the optical signal output from the multi-level phase modulator.

42. 发明授权

US08064130B2 Optical amplifier 有权
标题翻译：光放大器
公开(公告)号：US08064130B2
公开(公告)日：2011-11-22
申请号：US10351340
申请日：2003-01-27
申请人： Masato Nishihara , Yasushi Sugaya , Etsuko Hayashi
发明人： Masato Nishihara , Yasushi Sugaya , Etsuko Hayashi
IPC分类号： H04B10/17 , H04B10/12
CPC分类号： H04B10/2935 , H01S3/06758 , H01S3/06775 , H01S3/094011 , H01S3/10007 , H01S3/10023 , H01S3/1608 , H01S2301/02 , H01S2301/04
摘要： It is an object of the present invention to provide an optical amplifier using optical amplification mediums each doped with a rare earth element for increasing amplification efficiency of signal light in S-band and the like. To this end, the optical amplifier is constituted such that, when performing optical amplification for S-band and the like in which a center wavelength of a gain peak in the optical amplification medium is located at an outside of a signal band, a gain coefficient of when a pumping condition of the optical amplification medium is maximum is set so that a parameter η obtained by dividing a minimum value of the gain coefficient in the signal band by a maximum value of the gain coefficient outside of the signal band becomes a previously set value or more, wherein, for example, the parameter η can be increased by controlling a temperature of each of a plurality of EDFs between which gain equalizers are disposed.
摘要翻译：本发明的目的是提供一种使用各自掺杂有稀土元素的光放大介质的光放大器，用于提高S波段等信号光的放大效率。为此，光放大器被构成为：当对光放大介质中的增益峰值的中心波长位于信号频带外侧的S波段等进行光放大时，增益系数当光放大介质的泵送条件最大时，设定参数＆egr; 通过将信号频带中的增益系数的最小值除以信号频带之外的增益系数的最大值而获得的值成为预先设定的值以上，其中，例如参数＆egr; 可以通过控制在其间设置增益均衡器的多个EDF中的每一个的温度来增加。

43. 发明授权

US07853152B2 Signal regeneration device, optical receiver, and signal processing method 有权
标题翻译：信号再生装置，光接收机和信号处理方法
公开(公告)号：US07853152B2
公开(公告)日：2010-12-14
申请号：US11387936
申请日：2006-03-24
申请人： Masato Nishihara , Tomoo Takahara , George Ishikawa
发明人： Masato Nishihara , Tomoo Takahara , George Ishikawa
IPC分类号： H04B10/02
CPC分类号： H04B10/66 , H04L25/03159 , H04L2025/03522
摘要： A signal regeneration device which makes an extracted clock signal highly accurate while maintaining superior receiving sensitivity. To this end, a device of the present invention is configured to have a branch section for branching an input electrical signal which has been demodulated from a differential phase-shift modulated state; a first filter for equalizing a waveform of one of the demodulated electrical signals branched by the branch section; a clock recovery section for recovering a clock signal from the demodulated electrical signal whose waveform has been equalized by the first filter; and a data regeneration section for regenerating a data signal from a remaining one of the demodulated electrical signals branched by the branch section and from a clock signal recovered by the clock recovery section.
摘要翻译：一种信号再生装置，其使得提取的时钟信号高度准确，同时保持优异的接收灵敏度。为此，本发明的装置被配置为具有分支部分，用于对已经从差分相移调制状态解调的输入电信号进行分支; 第一滤波器，用于对由分支部分分支的解调电信号之一的波形进行均衡; 时钟恢复部分，用于从已被第一滤波器均衡的解调电信号中恢复时钟信号; 以及数据再生部分，用于从由分支部分分支的解调电信号中的剩余的一个信号和由时钟恢复部分恢复的时钟信号再生数据信号。

44. 发明申请

US20090041473A1 Optical device, optical modulation method, and optical transmitter 有权
标题翻译：光学装置，光学调制方法和光发射机
公开(公告)号：US20090041473A1
公开(公告)日：2009-02-12
申请号：US12219860
申请日：2008-07-29
申请人： Masato Nishihara , Tomoo Takahara , Toshiki Tanaka
发明人： Masato Nishihara , Tomoo Takahara , Toshiki Tanaka
IPC分类号： H04B10/04
CPC分类号： H04B10/5561 , H04B10/5051 , H04B10/5053 , H04B10/5057 , H04B10/5162 , H04B10/58
摘要： An optical modulation device including waveform shapers that waveform-shape input data signals in synchronism with a rising or falling timing based on comparison with a reference level of an input clock signal, a multi-level phase modulator that generates a multi-level-phase-modulated optical signal based on the data signals waveform-shaped by the plurality of waveform shapers, and outputs the generated optical signal, and a level ratio controller that varies a relative level ratio of the reference level to an amplitude level of the clock signal input to the waveform shapers, based on the optical signal output from the multi-level phase modulator.
摘要翻译：一种光调制装置，包括：波形整形器，其基于与输入时钟信号的基准电平的比较，与上升或下降定时同步的波形输入数据信号，产生多电平相位调制器的多电平相位调制器，基于由多个波形整形器波形形成的数据信号的调制光信号，并输出所生成的光信号;以及电平比控制器，其将参考电平的相对电平比改变为输入到波形整形器，基于从多电平相位调制器输出的光信号。

45. 发明申请

US20080088915A1 Optical amplification characteristics simulation apparatus and optical amplification characteristics simulation method 失效
标题翻译：光放大特性仿真装置及光放大特性仿真方法
公开(公告)号：US20080088915A1
公开(公告)日：2008-04-17
申请号：US11979370
申请日：2007-11-01
申请人： Etsuko Hayashi , Shunsuke Ono , Setsuhisa Tanabe , Shinichirou Muro , Masato Nishihara
发明人： Etsuko Hayashi , Shunsuke Ono , Setsuhisa Tanabe , Shinichirou Muro , Masato Nishihara
IPC分类号： H01S3/00 , H04B10/16 , H04B10/17 , H04J14/02
CPC分类号： H01S3/06754 , H01S3/0007 , H01S3/0064 , H01S3/06758 , H01S3/0677 , H01S3/09415 , H01S3/1608 , H01S2301/04
摘要： In an optical amplification characteristics simulation apparatus according to the present invention, using spectrums of a signal light input to an optical amplifier and a characteristic parameter for amplification medium, gain wavelength characteristics of the amplification medium are calculated. A calculating formula for the above has a parameter corresponding to a gain fluctuation portion due to a gain spectral hole burning (GSHB) phenomenon, and this parameter is defined by a function obtained by modeling a physical phenomenon in which a population inversion rate is reduced due to the GSHB, based on that electron occupation numbers in each Stark level on the end level side are increased. Then, based on the calculated gain wavelength characteristics, the output power of the signal light is obtained, to thereby perform the optical amplification characteristics simulation on the optical amplifier. As a result, it is possible to construct a high versatile calculation model based on the physical phenomenon for the gain fluctuation due to the GSHB, to thereby simulate with high precision the optical amplification characteristics of the optical amplifier under arbitrary conditions.
摘要翻译：在根据本发明的光放大特性模拟装置中，使用输入到光放大器的信号光的光谱和放大介质的特性参数，计算放大介质的增益波长特性。上述计算公式由于增益谱孔燃烧（GSHB）现象而具有与增益变动部分相对应的参数，该参数由通过模拟体积反转率减少的物理现象获得的函数来定义根据GSHB的最终级别的每个Stark级别的电子占有数量增加。然后，基于计算出的增益波长特性，获得信号光的输出功率，从而对光放大器进行光放大特性仿真。结果，可以基于由于GSHB引起的增益波动的物理现象构建高通用性计算模型，从而以任意条件高精度模拟光放大器的光放大特性。

46. 发明申请

US20080013904A1 OPTICAL FIBER, MANUFACTURING METHOD OF THE SAME, AND OPTICAL AMPLIFIER 有权
标题翻译：光纤，其制造方法和光放大器
公开(公告)号：US20080013904A1
公开(公告)日：2008-01-17
申请号：US11847663
申请日：2007-08-30
申请人： Masato Nishihara , Etsuko Hayashi , Shinya Inagaki
发明人： Masato Nishihara , Etsuko Hayashi , Shinya Inagaki
IPC分类号： G02B6/02
CPC分类号： H01S3/06708 , C03B37/01248 , C03B37/01433 , C03B37/01838 , C03B2201/34 , C03B2203/29 , G02B6/03633 , H01S3/06729 , H01S3/094003
摘要： An optical fiber includes: a first core portion doped with rare earth ions; a second core portion having a lower refractive index than that of the first core portion, provided along an outer circumference of the first core portion, and doped with the rare earth ions; and a clad portion having a lower refractive index than that of the second core portion and provided along an outer circumference of the second core portion, and is configured such that a concentration of the rare earth ions added to the second core portion is higher than that to the first core portion. With this configuration, it is possible to suppress an amount of FWM crosstalk in an optical amplification by decreasing the length of a fiber while alleviating efficiency deterioration due to concentration quenching.
摘要翻译：光纤包括：掺杂有稀土离子的第一芯部分; 具有比所述第一芯部的折射率低的第二芯部，沿着所述第一芯部的外周设置并掺杂有所述稀土离子; 以及包层部，其具有比所述第二芯部的折射率低的折射率，并且沿着所述第二芯部的外周设置，并且被配置为使得添加到所述第二芯部的所述稀土离子的浓度高于到第一核心部分。通过这种结构，可以通过减少纤维的长度同时减轻由于浓度骤冷引起的效率劣化来抑制光放大中的FWM串扰的量。

47. 发明申请

US20070127929A1 Signal regeneration device, optical receiver, and signal processing method 有权
标题翻译：信号再生装置，光接收机和信号处理方法
公开(公告)号：US20070127929A1
公开(公告)日：2007-06-07
申请号：US11387936
申请日：2006-03-24
申请人： Masato Nishihara , Tomoo Takahara , George Ishikawa
发明人： Masato Nishihara , Tomoo Takahara , George Ishikawa
IPC分类号： H04B10/00
CPC分类号： H04B10/66 , H04L25/03159 , H04L2025/03522
摘要： A signal regeneration device which makes an extracted clock signal highly accurate while maintaining superior receiving sensitivity. To this end, a device of the present invention is configured to have a branch section for branching an input electrical signal which has been demodulated from a differential phase-shift modulated state; a first filter for equalizing a waveform of one of the demodulated electrical signals branched by the branch section; a clock recovery section for recovering a clock signal from the demodulated electrical signal whose waveform has been equalized by the first filter; and a data regeneration section for regenerating a data signal from a remaining one of the demodulated electrical signals branched by the branch section and from a clock signal recovered by the clock recovery section.
摘要翻译：一种信号再生装置，其使得提取的时钟信号高度准确，同时保持优异的接收灵敏度。为此，本发明的装置被配置为具有分支部分，用于对已经从差分相移调制状态解调的输入电信号进行分支; 第一滤波器，用于对由分支部分分支的解调电信号之一的波形进行均衡; 时钟恢复部分，用于从已被第一滤波器均衡的解调电信号中恢复时钟信号; 以及数据再生部分，用于从由分支部分分支的解调电信号中的剩余的一个信号和由时钟恢复部分恢复的时钟信号再生数据信号。

48. 发明授权

US07061669B2 Optical apparatus with loss compensation capability and optical amplifier for loss compensation 有权
标题翻译：具有损耗补偿能力的光学设备和用于损耗补偿的光学放大器
公开(公告)号：US07061669B2
公开(公告)日：2006-06-13
申请号：US10950699
申请日：2004-09-28
申请人： Hisao Nakashima , Miki Onaka , Masato Nishihara , Etsuko Hayashi , Hideyuki Miyata
发明人： Hisao Nakashima , Miki Onaka , Masato Nishihara , Etsuko Hayashi , Hideyuki Miyata
IPC分类号： H01S3/00
CPC分类号： H04B10/291 , H01S3/1305 , H01S3/1312 , H01S5/0683 , H01S5/50
摘要： An optical apparatus having a loss compensation capability includes between an input connector 1A and an output connector 1B an input side optical parts 2 including an input monitor, an amplification medium 3, a loss medium 4, and an output side optical parts 5 including an output monitor in this order, and is provided with a control circuit 6 for controlling a gain based on a monitor result of input/output light. The amount of reflection attenuation on all points, on which the light can be reflected on the optical path from the output end of the amplification medium 3 to the output connector 1B, can be smaller than the amount of reflection attenuation on the end face of the output connector 1B.
摘要翻译：具有损耗补偿能力的光学装置在输入连接器1A和输出连接器1B之间包括输入侧光学部件2，输入侧光学部件2包括输入监视器，放大介质3，损耗介质4和输出侧光学部件5，包括输出监视器，并且设置有用于基于输入/输出光的监视结果来控制增益的控制电路6。光可以在从放大介质3的输出端到输出连接器1B的光路上反射的所有点上的反射衰减量可以小于在放大介质3的端面上的反射衰减量输出连接器1B。

49. 发明申请

US20050254119A1 Apparatus and method for amplification medium performance simulation, and optical amplifier 有权
标题翻译：用于放大介质性能仿真的装置和方法，以及光放大器
公开(公告)号：US20050254119A1
公开(公告)日：2005-11-17
申请号：US11187938
申请日：2005-07-25
申请人： Masato Nishihara , Yasushi Sugaya , Etsuko Hayashi
发明人： Masato Nishihara , Yasushi Sugaya , Etsuko Hayashi
IPC分类号： H01S3/00 , H01S3/067 , H01S3/10 , H01S3/16
CPC分类号： H04B10/0731 , H01S3/06716 , H01S3/06754 , H01S3/1608
摘要： An amplification medium simulation apparatus comprises a basic data retaining unit 21, an input signal beam information retaining unit 22, and a simulation executing unit 31 approximating and calculating an output signal beam power at each signal beam wavelength outputted from the amplification medium involving a fluctuation in ion population at the metastable energy level in the amplification medium due to input of the input signal beam, by using contents retained in the basic data retaining unit 21 and the input signal beam information retaining unit 22, and outputting a result of calculation as a result of simulation of performance of the amplification medium.
摘要翻译：放大介质模拟装置包括基本数据保持单元21，输入信号波束信息保持单元22和仿真执行单元31，该模拟执行单元31近似并计算从扩展介质输出的每个信号波长的输出信号波束功率，由于输入信号光束的输入，通过使用保存在基本数据保持单元21和输入信号光束信息保持单元22中的内容，在放大介质中的亚稳态能级的离子群，并输出计算结果的放大介质的性能仿真。

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