公开(公告)号：US06865348B2

公开(公告)日：2005-03-08

申请号：US09793954

申请日：2001-02-28

申请人： Yutaka Miyamoto ,  Akira Hirano ,  Kazushige Yonenaga ,  Kenji Sato ,  Hiromu Toba ,  Akihiko Matsuura

发明人： Yutaka Miyamoto ,  Akira Hirano ,  Kazushige Yonenaga ,  Kenji Sato ,  Hiromu Toba ,  Akihiko Matsuura

IPC分类号： H04B10/50 ,  H04B10/508 ,  H04B10/04 ,  H04B10/12

CPC分类号： H04B10/5055 ,  H04B10/505 ,  H04B10/5051 ,  H04B10/508

摘要： A system which improves wavelength tolerance, compensates dispersion in a simple way, reduces limitation of the fiber input power is disclosed. The operation includes receiving a clock signal from a system clock source; modulating a single mode optical signal based on the clock signal and generating an optical pulse signal having two longitudinal modes, the frequency interval thereof being n×B, n being a natural number and B being a transmission speed; generating a partial response signal by converting a binary NRZ signal from a digital signal source in synchronism with the system clock source; and modulating the optical pulse signal based on the partial response signal, and outputting a binary RZ modulated signal. The binary RZ modulated signal is input into a receiver, where two partial response components in the optical spectra of the input signal are divided, and one or both of the components are received.

摘要翻译： 提高波长公差的系统以简单的方式补偿色散，减少了光纤输入功率的限制。 该操作包括从系统时钟源接收时钟信号; 基于时钟信号调制单模光信号并产生具有两个纵模的光脉冲信号，其频率间隔为n×B，n为自然数，B为传输速度; 通过与系统时钟源同步地从数字信号源转换二进制NRZ信号来产生部分响应信号; 并根据部分响应信号调制光脉冲信号，并输出二进制RZ调制信号。 二进制RZ调制信号被输入到接收机中，其中输入信号的光谱中的两个部分响应分量被分割，并且接收一个或两个分量。

公开(公告)号：US07536112B2

公开(公告)日：2009-05-19

申请号：US09939716

申请日：2001-08-28

申请人： Kazushige Yonenaga ,  Yutaka Miyamoto ,  Akihiko Matsuura

发明人： Kazushige Yonenaga ,  Yutaka Miyamoto ,  Akihiko Matsuura

IPC分类号： H04B10/04

CPC分类号： H04B10/5167 ,  H04B10/505 ,  H04B10/5055

摘要： An optical transmission system which provides bandwidth restricted optical signal comprises an input terminal (10) for accepting an electrical binary signal, an amplifier (12) for amplifying said electrical binary signal to the level requested for operating an electrical-optical converter (16) such as a Mach Zehnder light modulator, a bandwidth restriction means (14) which is for instance a low pass filter for restricting bandwidth of said electrical binary signal, and an electrical-optical conversion means (16) such as a Mach Zehnder light modulator for converting electrical signal to optical signal. Because of the location of the low pass filter (14) between an output of the amplifier (12) and the Mach Zehnder light modulator (16), the amplifier (12) may operate in saturation region to provide high level output signal enough for operating the Mach Zehnder light modulator, and a signal shaped by the low pass filter (14) is applied to the Mach Zehnder light modulator (16) with excellent waveform. The invention is useful for long distance, large capacity and low cost optical transmission system.

公开(公告)号：US20080205903A1

公开(公告)日：2008-08-28

申请号：US12081733

申请日：2008-04-21

申请人： Kazushige Yonenaga ,  Yutaka Miyamoto ,  Akihiko Matsuura

发明人： Kazushige Yonenaga ,  Yutaka Miyamoto ,  Akihiko Matsuura

IPC分类号： H04B10/04

CPC分类号： H04B10/5167 ,  H04B10/505 ,  H04B10/5055

摘要： An optical transmission system which provides bandwidth restricted optical signal comprises an input terminal (10) for accepting an electrical binary signal, an amplifier (12) for amplifying said electrical binary signal to the level requested for operating an electrical-optical converter (16) such as a Mach Zehnder light modulator, a bandwidth restriction means (14) which is for instance a low pass filter for restricting bandwidth of said electrical binary signal, and an electrical-optical conversion means (16) such as a Mach Zehnder light modulator for converting electrical signal to optical signal. Because of the location of the low pass filter (14) between an output of the amplifier (12) and the Mach Zehnder light modulator (16), the amplifier (12) may operate in saturation region to provide high level output signal enough for operating the Mach Zehnder light modulator, and a signal shaped by the low pass filter (14) is applied to the Mach Zehnder light modulator (16) with excellent waveform. The invention is useful for long distance, large capacity and low cost optical transmission system.

摘要翻译： 提供带宽限制光信号的光传输系统包括用于接受电二进制信号的输入端（10），用于将所述电二进制信号放大到用于操作电 - 光转换器（16）所请求的电平的放大器（12） 作为马赫曾德尔光调制器，带宽限制装置（14），例如用于限制所述电二进制信号的带宽的低通滤波器，以及诸如马赫曾德尔光调制器的电 - 光转换装置（16），用于转换 电信号到光信号。 由于放大器（12）的输出端与马赫曾德尔光调制器（16）之间的低通滤波器（14）的位置，放大器（12）可以在饱和区域中工作，以提供足够的高电平输出信号 马赫曾德尔光调制器和由低通滤波器（14）成形的信号以优异的波形施加到马赫曾德尔光调制器（16）。 本发明对于长距离，大容量和低成本的光传输系统是有用的。

公开(公告)号：US07542631B2

公开(公告)日：2009-06-02

申请号：US12081733

申请日：2008-04-21

申请人： Kazushige Yonenaga ,  Yutaka Miyamoto ,  Akihiko Matsuura

发明人： Kazushige Yonenaga ,  Yutaka Miyamoto ,  Akihiko Matsuura

IPC分类号： G02F1/295 ,  H04B10/04

CPC分类号： H04B10/5167 ,  H04B10/505 ,  H04B10/5055

摘要： An optical transmission system which provides bandwidth restricted optical signal comprises an input terminal (10) for accepting an electrical binary signal, an amplifier (12) for amplifying said electrical binary signal to the level requested for operating an electrical-optical converter (16) such as a Mach Zehnder light modulator, a bandwidth restriction means (14) which is for instance a low pass filter for restricting bandwidth of said electrical binary signal, and an electrical-optical conversion means (16) such as a Mach Zehnder light modulator for converting electrical signal to optical signal. Because of the location of the low pass filter (14) between an output of the amplifier (12) and the Mach Zehnder light modulator (16), the amplifier (12) may operate in saturation region to provide high level output signal enough for operating the Mach Zehnder light modulator, and a signal shaped by the low pass filter (14) is applied to the Mach Zehnder light modulator (16) with excellent waveform. The invention is useful for long distance, large capacity and low cost optical transmission system.

摘要翻译： 提供带宽限制光信号的光传输系统包括用于接受电二进制信号的输入端（10），用于将所述电二进制信号放大到用于操作电 - 光转换器（16）所请求的电平的放大器（12） 作为马赫曾德尔光调制器，带宽限制装置（14），例如用于限制所述电二进制信号的带宽的低通滤波器，以及诸如马赫曾德尔光调制器的电 - 光转换装置（16），用于转换 电信号到光信号。 由于放大器（12）的输出端与马赫曾德尔光调制器（16）之间的低通滤波器（14）的位置，放大器（12）可以在饱和区域中工作，以提供足够的高电平输出信号 马赫曾德尔光调制器和由低通滤波器（14）成形的信号以优异的波形施加到马赫曾德尔光调制器（16）。 本发明对于长距离，大容量和低成本的光传输系统是有用的。

公开(公告)号：US06983085B2

公开(公告)日：2006-01-03

申请号：US10358737

申请日：2003-02-05

申请人： Tomoyoshi Kataoka ,  Akira Hirano ,  Akihiko Matsuura

发明人： Tomoyoshi Kataoka ,  Akira Hirano ,  Akihiko Matsuura

IPC分类号： G02F1/035

CPC分类号： H04B10/505 ,  G02F2203/21 ,  H04B10/5051 ,  H04B10/50575 ,  H04B10/564

摘要： The optical transmission circuit of the present invention has an optical modulator 12 which modulates continuous light at wavelength λo with a signal at repetition frequency fo Hz and outputs alternating phase-inverted pulse light; a bias voltage applying unit 14 which applies a bias voltage to the optical modulator 12; an optical power spectrum measuring unit 17 having frequency resolution of less than fo Hz which measures the optical power spectrum of light output from the optical modulator 12; and a control circuit which controls the bias voltage via the bias voltage applying unit 14 based on measurements of the power spectrum of the output light of the optical modulator 12, so as to minimize the power intensity of the carrier spectrum component of wavelength λo, or to maximize the power intensity of the spectrum component in both side bands.

摘要翻译： 本发明的光传输电路具有光调制器12，其以重复频率为fHz的信号调制波兰兰波的连续光，并输出交替的相位反转的脉冲光; 偏置电压施加单元14，其向光调制器12施加偏置电压; 光功率谱测量单元17，其具有测量从光调制器12输出的光的光功率谱的小于f Hz的频率分辨率; 以及控制电路，其基于光调制器12的输出光的功率谱的测量，经由偏置电压施加单元14控制偏置电压，以使波长兰波的载流子分量的功率强度最小化，或 以最大化两个边带中的频谱分量的功率强度。