公开(公告)号：US20080106780A1

公开(公告)日：2008-05-08

申请号：US11935744

申请日：2007-11-06

申请人： Tsutomu Niiho ,  Kouichi Masuda ,  Masaru Fuse ,  Fumio Fujisaki ,  Kuniharu Itakura ,  Tomoaki Ohira

发明人： Tsutomu Niiho ,  Kouichi Masuda ,  Masaru Fuse ,  Fumio Fujisaki ,  Kuniharu Itakura ,  Tomoaki Ohira

IPC分类号： G02F1/03

CPC分类号： G02F1/225 ,  G02F1/0123 ,  G02F2001/212

摘要： An optical modulator comprises an electrode 21 which applies to an optical waveguides 12 of a Mach-Zehnder type optical interference system a first electric signal based on an alternating current signal S1 and a direct current bias V1, an electrode 22 which applies to an optical waveguide 13 of the Mach-Zehnder type optical interference system a second electric signal based on an alternating current signal S2 and a direct current bias V2, and a bias setting section 41 which sets average direct current levels of the first and second electric signals based on signal frequency information D1 which indicates a magnitude relation between a maximum frequency of the alternating current signal S1 and a maximum frequency of the alternating current signal S2.

摘要翻译： 光调制器包括电极21，电极21基于交流电信号S1和直流偏压V 1施加马赫 - 策德尔型光学干涉系统的光波导12，第一电信号适用于 马赫曾德尔型光学干涉系统的光波导13基于交流信号S 2和直流偏压V 2的第二电信号，以及偏置设定部41，其设定第一和第二电气的平均直流电平 基于表示交流信号S 1的最大频率与交流信号S2的最大频率之间的大小关系的信号频率信息D 1的信号。

公开(公告)号：US07660027B2

公开(公告)日：2010-02-09

申请号：US11935744

申请日：2007-11-06

申请人： Tsutomu Niiho ,  Kouichi Masuda ,  Masaru Fuse ,  Fumio Fujisaki ,  Kuniharu Itakura ,  Tomoaki Ohira

发明人： Tsutomu Niiho ,  Kouichi Masuda ,  Masaru Fuse ,  Fumio Fujisaki ,  Kuniharu Itakura ,  Tomoaki Ohira

IPC分类号： G02B1/07

CPC分类号： G02F1/225 ,  G02F1/0123 ,  G02F2001/212

摘要： An optical modulator comprises an electrode 21 which applies to an optical waveguides 12 of a Mach-Zehnder type optical interference system a first electric signal based on an alternating current signal S1 and a direct current bias V1, an electrode 22 which applies to an optical waveguide 13 of the Mach-Zehnder type optical interference system a second electric signal based on an alternating current signal S2 and a direct current bias V2, and a bias setting section 41 which sets average direct current levels of the first and second electric signals based on signal frequency information D1 which indicates a magnitude relation between a maximum frequency of the alternating current signal S1 and a maximum frequency of the alternating current signal S2.

摘要翻译： 光调制器包括电极21，该电极施加到马赫 - 曾德尔型光学干涉系统的光波导12，基于交流信号S1和直流偏压V1的第一电信号，适用于光波导的电极22 马赫曾德尔型光干涉系统13基于交流信号S2和直流偏压V2的第二电信号，以及偏置设定部41，其基于信号设定第一和第二电信号的平均直流电平 表示交流信号S1的最大频率与交流信号S2的最大频率之间的大小关系的频率信息D1。

公开(公告)号：US20090009259A1

公开(公告)日：2009-01-08

申请号：US12160290

申请日：2007-01-12

申请人： Tomoaki Ohira ,  Kouichi Masuda ,  Masaru Fuse ,  Tsutomu Niiho

发明人： Tomoaki Ohira ,  Kouichi Masuda ,  Masaru Fuse ,  Tsutomu Niiho

IPC分类号： H03C3/02

CPC分类号： G02F2/002 ,  G02F1/225 ,  H04B10/505 ,  H04B10/5051

摘要： An angle modulator having an excellent noise characteristic and an excellent distortion characteristic independent of an unwanted wave component of an optical modulation signal is provided. The angle modulator (10) includes an optical SSB modulation section (103a), an optical SSB-SC modulation section (104a), and an optical angle modulation section (105). By performing intensity modulation on an output signal of the optical SSB modulation section (103a) at the optical SSB-SC modulation section (104a), an unwanted angle modulated signal is prevented from overlapping with an angle modulated signal outputted from an optical detection section (107). Further, by a filter (108) filtering only an angle modulated signal component which does not include the unwanted wave component among the angle modulated signal components outputted from the optical detection section (107), a distortion characteristic after angle demodulation can be prevented from deteriorating. Thus, the angle modulator according to the present invention can output an angle modulated signal having an excellent noise characteristic and an excellent distortion characteristic.

摘要翻译： 提供了具有优异的噪声特性和独特于光调制信号的有害波分量的优异失真特性的角度调制器。 角度调制器（10）包括光学SSB调制部分（103a），光学SSB-SC调制部分（104a）和光学角度调制部分（105）。 通过对光SSB-SC调制部（104a）的光SSB调制部（103a）的输出信号进行强度调制，防止不希望的角度调制信号与从光检测部输出的角度调制信号 107）。 此外，通过对从光检测部（107）输出的角度调制信号成分中不包含不需要波分量的角度调制信号分量进行滤波的滤波器（108），可以防止角度解调后的失真特性劣化 。 因此，根据本发明的角度调制器可以输出具有优异的噪声特性和优异的失真特性的角度调制信号。

公开(公告)号：US07734185B2

公开(公告)日：2010-06-08

申请号：US11878261

申请日：2007-07-23

申请人： Tomoaki Ohira ,  Kouichi Masuda ,  Masaru Fuse

发明人： Tomoaki Ohira ,  Kouichi Masuda ,  Masaru Fuse

IPC分类号： H04B10/00 ,  H04B10/04

CPC分类号： H04B10/54 ,  H04B10/505 ,  H04B10/5053 ,  H04B10/5161 ,  H04B10/5165 ,  H04B10/548

摘要： An optical SSB-SC modulation section 13 subjects an optical signal fa outputted from an optical source 11 to an optical SSB-SC modulation based on the amplitude of an external electric signal fc to thereby output an optical intensity-modulated signal. An optical phase modulation section 14 subjects the optical signal fa to an optical phase modulation based on the amplitude levels of the first to nth external electric signals having frequencies f1 to fn to thereby output the resultant signal as an optical phase-modulated signal. An optical combining section 15 combines together the optical intensity-modulated signal and the optical phase-modulated signal. An optical detecting section 16 performs an optical homodyne detection through a squared detection of the optical intensity-modulated signal and the optical phase-modulated signal combined together to thereby produce a wideband modulated signal, being the difference beat signal between the two optical signals. A combining section 17 combines together the wideband modulated signal and the oth to tth electric signals having frequencies fo to ft to thereby output the resultant signal as a wideband modulated signal.

摘要翻译： 光SSB-SC调制部13基于外部电信号fc的振幅，对从光源11输出的光信号fa进行光SSB-SC调制，从而输出光强度调制信号。 光相位调制部分14基于具有频率f1至fn的第一至第n外部电信号的幅度电平对光信号fa进行光相位调制，由此输出所得到的信号作为光相位调制信号。 光合成部15将光强度调制信号和光相位调制信号组合在一起。 光学检测部分16通过光学调制信号和光相位调制信号的平方检测进行光学零差检测，从而产生作为两个光信号之间的差拍信号的宽带调制信号。 组合部分17将宽带调制信号和具有频率fo至ft的第th至第th电信号组合在一起，从而将所得到的信号作为宽带调制信号输出。

公开(公告)号：US20080031630A1

公开(公告)日：2008-02-07

申请号：US11878261

申请日：2007-07-23

申请人： Tomoaki Ohira ,  Kouichi Masuda ,  Masaru Fuse

发明人： Tomoaki Ohira ,  Kouichi Masuda ,  Masaru Fuse

IPC分类号： H04B10/00 ,  H04B10/04 ,  H04B10/08

CPC分类号： H04B10/54 ,  H04B10/505 ,  H04B10/5053 ,  H04B10/5161 ,  H04B10/5165 ,  H04B10/548

摘要： An optical SSB-SC modulation section 13 subjects an optical signal fa outputted from an optical source 11 to an optical SSB-SC modulation based on the amplitude of an external electric signal fc to thereby output an optical intensity-modulated signal. An optical phase modulation section 14 subjects the optical signal fa to an optical phase modulation based on the amplitude levels of the first to nth external electric signals having frequencies f1 to fn to thereby output the resultant signal as an optical phase-modulated signal. An optical combining section 15 combines together the optical intensity-modulated signal and the optical phase-modulated signal. An optical detecting section 16 performs an optical homodyne detection through a squared detection of the optical intensity-modulated signal and the optical phase-modulated signal combined together to thereby produce a wideband modulated signal, being the difference beat signal between the two optical signals. A combining section 17 combines together the wideband modulated signal and the oth to tth electric signals having frequencies fo to ft to thereby output the resultant signal as a wideband modulated signal.

摘要翻译： 光SSB-SC调制部13基于外部电信号fc的振幅，对从光源11输出的光信号fa进行光SSB-SC调制，从而输出光强度调制信号。 光相位调制部分14基于具有频率f 1至f n的第一至第n外部电信号的振幅电平使光信号fa进行光相位调制，从而将所得信号输出为 光相位调制信号。 光合成部15将光强度调制信号和光相位调制信号组合在一起。 光学检测部分16通过光学调制信号和光相位调制信号的平方检测进行光学零差检测，从而产生作为两个光信号之间的差拍信号的宽带调制信号。 组合部分17将具有频率fo至ft的宽带调制信号和第个电信号组合在一起，从而输出所得到的信号作为宽带调制信号。

公开(公告)号：US07650112B2

公开(公告)日：2010-01-19

申请号：US10530651

申请日：2003-10-17

申请人： Kuniaki Utsumi ,  Hiroaki Yamamoto ,  Kouichi Masuda ,  Tsutomu Niiho ,  Mariko Nakaso ,  Hiroyuki Sasai

发明人： Kuniaki Utsumi ,  Hiroaki Yamamoto ,  Kouichi Masuda ,  Tsutomu Niiho ,  Mariko Nakaso ,  Hiroyuki Sasai

IPC分类号： H04B7/15

CPC分类号： H04W4/18 ,  H04B10/25754 ,  H04W84/12 ,  H04W88/04 ,  H04W92/02

摘要： A SW (70) receives an Ethernet® signal from an outside of areas E and F. The SW (70) selects and outputs the obtained Ethernet® signal to any one of APs (91a to 91e) in accordance with a network structure managed by the SW (70). The AP (91a to 91e) converts the Ethernet® signal to an electrical signal type wireless LAN signal, which is in turn output to a main station (10). The main station (10) frequency-multiplexes the signal output from each of the APs (91a to 91e), and converts the signal to an optical signal, which is in turn output to sub-stations (20a and 20b). The sub-station (20a and 20b) transmits the signal transmitted from the main station (10) to a terminal in the form of a wireless radio wave. Thereby, when a plurality of communication areas are present, the accommodation capacity of an AP can be effectively utilized in each communication area.

摘要翻译： SW（70）从区域E和F的外部接收以太网（R）信号.SW（70）根据以下（a）所示的AP（91a至91e）中的任何一个选择并输出所获得的以太网（R）信号 SW（70）管理的网络结构。 AP（91a至91e）将以太网（R）信号转换为电信号型无线LAN信号，该电信号型无线LAN信号又输出到主站（10）。 主站（10）对从每个AP（91a至91e）输出的信号进行频率复用，并将该信号转换为光信号，该信号又输出到子站（20a和20b）。 子站（20a和20b）以无线电波的形式将从主站（10）发送的信号发送到终端。 因此，当存在多个通信区域时，可以在每个通信区域中有效地利用AP的容纳能力。

公开(公告)号：US20060289730A1

公开(公告)日：2006-12-28

申请号：US11474458

申请日：2006-06-26

申请人： Tsutomu Niiho ,  Kouichi Masuda

发明人： Tsutomu Niiho ,  Kouichi Masuda

IPC分类号： G01J1/04 ,  G01J5/08

CPC分类号： H04B10/2581

摘要： Provided is a multimode optical transmission system for reducing a deterioration of a noise characteristic and a distortion characteristic caused by an interference between modes. In an optical transmitter 11, a signal output section outputs a predetermined signal based on an inputted electrical signal. A control section 130 controls the signal output section so as to adjust a frequency component of the signal outputted by the signal output section based on group delay information of modes which propagate in a multimode optical transmission line 310. An electric-optic conversion section 110 converts, into an optical signal, the signal outputted by the signal output section, and transmits the optical signal via the multimode optical transmission line 310.

摘要翻译： 提供了一种用于减少由模式之间的干扰引起的噪声特性和失真特性恶化的多模光传输系统。 在光发射机11中，信号输出部根据输入的电信号输出规定的信号。 控制部分130控制信号输出部分，以便基于在多模光传输线路310中传播的模式的组延迟信息来调整由信号输出部分输出的信号的频率分量。 电光转换部110将由信号输出部输出的信号转换为光信号，并经由多模光传输线310发送光信号。

公开(公告)号：US20060198332A1

公开(公告)日：2006-09-07

申请号：US10546729

申请日：2004-12-03

申请人： Tsutomu Niiho ,  Kouichi Masuda

发明人： Tsutomu Niiho ,  Kouichi Masuda

IPC分类号： H04Q7/00

CPC分类号： H04W72/121 ,  H04W74/0816 ,  H04W88/085

摘要： A wireless access system is provided which prevents the occurrence of a hidden terminal problem and minimizes the reduction in throughput. In the wireless access system, an access point (12) divides terminals into groups such that terminals in one group cannot recognize radio waves sent from terminals in another group, and performs communication with the terminals on a per-group basis. By this, the wireless access system avoids the occurrence of the hidden terminal problem. RTS/CTS packets used to avoid the occurrence of the hidden terminal problem are exchanged between the access point (12) and terminals (131 to 133, 141 to 142) on a per-group basis, whereby overhead is reduced and the reduction in throughput is minimized.

摘要翻译： 提供了一种无线接入系统，其防止隐藏终端问题的发生并且最小化吞吐量的降低。 在无线接入系统中，接入点（12）将终端分成组，使得一组中的终端不能识别从另一组中的终端发送的无线电波，并且以每组为基础与终端进行通信。 由此，无线接入系统避免了隐藏终端问题的发生。 用于避免隐藏终端问题发生的RTS / CTS分组在每组基础上在接入点（12）和终端（131至133,141至142）之间交换，从而降低开销并减少吞吐量 被最小化。

公开(公告)号：US07460829B2

公开(公告)日：2008-12-02

申请号：US10530976

申请日：2004-07-22

申请人： Kuniaki Utsumi ,  Hiroaki Yamamoto ,  Kouichi Masuda ,  Tsutomu Niiho ,  Mariko Nakaso ,  Kazuo Tanaka ,  Hiroyuki Sasai

发明人： Kuniaki Utsumi ,  Hiroaki Yamamoto ,  Kouichi Masuda ,  Tsutomu Niiho ,  Mariko Nakaso ,  Kazuo Tanaka ,  Hiroyuki Sasai

IPC分类号： H04B7/185

CPC分类号： H04W52/143 ,  H04B10/25754 ,  H04W52/24 ,  H04W88/085

摘要： A wireless communication system capable of keeping a level of a wireless signal received by a relay apparatus within a predetermined dynamic range. In a control apparatus, a transmitting section converts a downstream electric signal into a downstream optical signal and transmits the downstream optical signal to the relay apparatus via an optical transmission path. The relay apparatus converts the received downstream optical signal into a downstream electric signal and transmits the downstream electric signal as a wireless signal to a wireless communication terminal from a transmitting/receiving antenna section. In the relay apparatus, a level adjustment section adjusts the level of the wireless signal transmitted by the relay apparatus such that the receiving level of the wireless signal received by the relay apparatus is kept within a predetermined range.

摘要翻译： 一种无线通信系统，其能够将中继装置接收到的无线信号的电平保持在规定的动态范围内。 在控制装置中，发送部将下行电信号转换为下行光信号，经由光传输路径将下行光信号发送给中继装置。 中继装置将接收到的下行光信号转换成下行电信号，并且将来自发送/接收天线部的无线信号的下行电信号发送到无线通信终端。 在中继装置中，电平调整部分调整由中继装置发送的无线信号的电平，使得由中继装置接收的无线信号的接收电平保持在预定范围内。

公开(公告)号：US07630643B2

公开(公告)日：2009-12-08

申请号：US10585320

申请日：2005-07-25

申请人： Tsutomu Niiho ,  Kouichi Masuda

发明人： Tsutomu Niiho ,  Kouichi Masuda

IPC分类号： H04J14/02

CPC分类号： H04B10/275 ,  H04B10/2581 ,  H04J14/0201

摘要： Provided is a multimode optical transmission system capable of reducing an influence of multimode dispersion occurring when an optical signal is transmitted in multimode. Light sources (101 to 10m) respectively convert inputted electrical signals into a plurality of optical signals respectively having different wavelengths, and respectively output the plurality of optical signals. A wavelength multiplexing section (200) performs wavelength multiplexing of the plurality of optical signals outputted from the light sources (101 to 10m), and outputs a resultant signal as a wavelength multiplexed signal. A multimode optical transmission path (300) optically transmits the wavelength multiplexed signal in multimode. A mode processing section (400) extracts, from the wavelength multiplexed signal transmitted through the multimode optical transmission path (300), a plurality of optical signals each being in a mode having a particular wavelength and a particular propagation constant. Optical receiving sections (501 to 50m) receive the plurality of optical signals having been extracted, and convert the received optical signals into electrical signals.

摘要翻译： 提供了一种多模光传输系统，其能够减少当以多模式传输光信号时发生的多模色散的影响。 光源（101〜10m）分别将输入的电信号转换为分别具有不同波长的多个光信号，分别输出多个光信号。 波长复用部（200）对从光源（101〜10m）输出的多个光信号进行波长多路复用，输出作为波长复用信号的合成信号。 多模光传输路径（300）以多模光学地传输波长多路复用信号。 模式处理部分（400）从通过多模光传输路径（300）传输的波长复用信号中提取多个光信号，每个光信号处于具有特定波长和特定传播常数的模式中。 光接收部（501〜50m）接收已经提取的多个光信号，并将接收的光信号转换为电信号。