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公开(公告)号：US06313701B1
公开(公告)日：2001-11-06
申请号：US09440681
申请日：1999-11-12
申请人： Franco Mussino , Massimo Notargiacomo , Gianluca Gobetti , Giuseppe Ravasio , Claudio Zammarchi
发明人： Franco Mussino , Massimo Notargiacomo , Gianluca Gobetti , Giuseppe Ravasio , Claudio Zammarchi
IPC分类号： H03F126
CPC分类号： H04B10/58 , H04B1/62 , H04B10/505
摘要： The present invention relates to a method and to a signal predistorter circuit for eliminiating the nonlinearities in the input/output characteristics of nonlinear stages, in particular for eliminating the third-order nonlinearities. More particularly, it relates to a method and to a predistorter circuit for external optical modulators of television signals. The method for predistortion of a signal of variable amplitude comprises the phases of: delivering the said signal to at least one first distorter circuit; biasing the said at least one first distorter circuit; distorting the said signal in the said at least one first distorter circuit; characterized in that the said phase of biasing the said at least one first distorter circuit comprises the phase of maintaining a substantially constant preset voltage value on varying the amplitude of the said signal at the said at least one first distorter circuit.
摘要翻译： 本发明涉及一种用于消除非线性阶段的输入/输出特性中的非线性的方法和信号预失真器电路，特别是用于消除三阶非线性。 更具体地说，它涉及一种用于电视信号的外部光调制器的方法和预失真器电路。 用于预失真的可变幅度信号的方法包括以下阶段：将所述信号传送到至少一个第一变压器电路; 偏压所述至少一个第一变压器电路; 在所述至少一个第一变压器电路中使所述信号失真; 其特征在于，偏置所述至少一个第一变压器电路的所述相位包括在所述至少一个第一变压器电路上改变所述信号的振幅时保持基本恒定的预设电压值的相位。
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公开(公告)号：US5812297A
公开(公告)日：1998-09-22
申请号：US720463
申请日：1996-09-30
CPC分类号： H04B10/50595 , G02F1/0123 , H04B10/5057 , H04B10/50575 , H04B10/58 , H04B2210/075
摘要： An analog-external-modulation optical, emitter is described which comprises an electro-optical modulator and a piloting circuit. The piloting circuit comprises a pilot-tone-generating circuit; an electric control signal generated by the optical signal coming out of the modulator and a predetermined bias voltage are fed to the input of a differential amplifier the output of which is added to the pilot tone to feed an electric input of the electro-optical modulator. The RF input of the analog electric signal is connected to a linearizer circuit to which the pilot-tone-generating circuit is also connected. The output of the linearizer circuit is sent to an electric input of the electro-optical modulator through a band-stop filter adapted to eliminate the pilot tone downstream of the linearizer circuit.
摘要翻译： 描述了一种模拟 - 外部调制光学发射器，其包括电光调制器和导频电路。 导频电路包括导频音产生电路; 由调制器出来的光信号产生的电控信号和预定的偏置电压被馈送到差分放大器的输入端，差分放大器的输出被加到导频音上，以馈送电光调制器的电输入端。 模拟电信号的RF输入连接到导频音产生电路也连接到的线性化电路。 线性化电路的输出通过适于消除线性化电路下游导频的带阻滤波器发送到电光调制器的电输入端。
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公开(公告)号：US06909821B2
公开(公告)日：2005-06-21
申请号：US10169167
申请日：2000-12-27
IPC分类号： G02B6/38 , G02B6/42 , H04B10/272 , G02B6/28 , H04J14/00
CPC分类号： H04B10/272 , G02B6/3861 , G02B6/3878 , G02B6/3887 , G02B6/4204 , G02B6/4225 , G02B6/424 , G02B6/4244 , G02B6/4245 , G02B6/4246 , G02B6/4249
摘要： A network for distributing signals to a plurality of user apparatuses having a distribution unit with a plurality of ports, and a plurality of optical-fiber cables connected to the ports and suitable to make the plurality of ports of the distribution unit communicate with the plurality of user apparatuses. At least one of the plurality of optical-fiber cables is an electrically terminated optical cable having an optical cable with a single-mode optical fiber and an opto-electronic end portion mechanically and permanently connected to an end of the optical cable, and the opto-electronic end portion has an opto-electronic conversion device having an optic port optically aligned with and mechanically connected to, an end of the single-mode optical fiber.
摘要翻译： 一种用于向具有多个端口的分配单元的多个用户装置发送信号的网络，以及连接到所述端口并适于使所述分配单元的多个端口与所述多个端口通信的多个光纤电缆 用户装置。 多根光纤电缆中的至少一根是具有光缆的电端接的光缆，该光缆具有单模光纤，光电端部机械地且永久地连接到光缆的一端，光电 电子端部具有光电转换装置，其具有与单模光纤的端部光学对准并机械连接的光端口。
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公开(公告)号：US5910852A
公开(公告)日：1999-06-08
申请号：US759792
申请日：1996-12-03
IPC分类号： G02B6/024 , G02B27/28 , H04B10/02 , H04B10/04 , H04B10/06 , H04B10/135 , H04B10/142 , H04B10/152 , H04B10/18 , H04B10/00
CPC分类号： H04B10/2537 , H04B10/532
摘要： An optical communication system is described which includes an optical source; an optical modulator, receiving a transmission signal having frequencies included within a signal band and adapted to emit a modulated optical signal of a predetermined optical bandwidth; an optical transmission line comprising an optical fiber portion; and an optical receiver adapted to receive the optical signal in the presence of a predetermined SNR in the signal band, measured in a 5 MHz band. The telecommunication system further comprises, optically connected between the optical modulator and the optical transmission line, a depolarizer comprising two polarization-maintaining optical fiber portions, optically connected with each other in such a manner that the respective polarization axes form an angle of 45.degree., in which the optical bandwidth, lengths and birefringence of the polarization-maintaining optical fibers are operatively selected so that the SNR at the receiver in the signal band does not differ more than 1 dB from the SNR at the receiver measured in a band of 5 MHz by substituting the optical fiber portion of the transmission line with a passive attenuator of same attenuation.
摘要翻译： 描述了包括光源的光通信系统; 光调制器，接收具有包括在信号频带内并且适于发射预定光带宽的调制光信号的频率的发射信号; 光传输线，包括光纤部分; 以及光接收机，其适于在存在以5MHz频带测量的信号频带中的预定SNR的情况下接收光信号。 电信系统还包括光连接在光调制器和光传输线之间的消偏振器，包括两个偏振保持光纤部分，它们以相应的偏振轴形成45°的角度彼此光学连接， 其中可操作地选择保偏光纤的光学带宽，长度和双折射，使得信号频带中的接收机处的SNR与在5MHz的频带中测量的接收机处的SNR相比不超过1dB 通过用相同衰减的无源衰减器代替传输线的光纤部分。
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公开(公告)号：US20070183791A1
公开(公告)日：2007-08-09
申请号：US11275977
申请日：2006-02-08
IPC分类号： H04B10/04
CPC分类号： H04B10/5167 , H04B10/505 , H04B10/5055 , H04B10/541
摘要： Methods and apparatus for supporting a plurality of modulation formats using a single transmitter are disclosed. According to one aspect of the present invention, a transmitter arrangement that provides a signal to a modulator that creates an optical data stream from the signal includes an encoder and a switching/filtering arrangement. The encoder has a state that is varied between first and second encoder states. If the state is the first encoder state, the encoder encodes the signal in a format associated with an optical duobinary (ODB) modulation format. Otherwise, the encoder does not encode the signal in the format associated with the ODB modulation format. The switching/filtering arrangement receives the signal from the encoder, and provides the signal to the modulator. If the variable state of the encoder is the first encoder state, the switching/filtering arrangement has a low bandpass configuration. Otherwise, the switching/filtering arrangement has a high bandpass configuration.
摘要翻译： 公开了使用单个发射机支持多种调制格式的方法和装置。 根据本发明的一个方面，向调制器提供信号以从信号产生光学数据流的发射器装置包括编码器和开关/滤波装置。 编码器具有在第一和第二编码器状态之间变化的状态。 如果状态是第一编码器状态，则编码器以与光学双二进制（ODB）调制格式相关联的格式对信号进行编码。 否则，编码器不以与ODB调制格式相关联的格式对信号进行编码。 切换/滤波装置从编码器接收信号，并将信号提供给调制器。 如果编码器的可变状态是第一编码器状态，则开关/滤波装置具有低带通配置。 否则，开关/滤波装置具有高带通配置。
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公开(公告)号：US20070076768A1
公开(公告)日：2007-04-05
申请号：US11162707
申请日：2005-09-20
申请人： Luca Chiesa , Giuseppe Ravasio , Mauro Casanova , Giacomo Losio
发明人： Luca Chiesa , Giuseppe Ravasio , Mauro Casanova , Giacomo Losio
IPC分类号： H04J3/02
CPC分类号： H04B10/2725 , H04J3/1611 , H04J2203/0069
摘要： A transponder unit which relays signals between a plurality of channels of an optical transport network and a plurality of clients. The interconnections within the transponder unit are reconfigurable for selective connections. A connection between a first client and a first network channel and a connection between a second client and a second network channel is independent of each other and may be selected so that the second client is connected to the first network channel and the first client is connected to the second network channel. Other selected connections are also possible.
摘要翻译： 一种在光传输网络的多个信道和多个客户端之间中继信号的应答器单元。 应答器单元内的互连可重新配置用于选择性连接。 第一客户端和第一网络信道之间的连接以及第二客户端与第二网络信道之间的连接彼此独立，并且可以被选择，使得第二客户端连接到第一网络信道，并且第一客户端被连接 到第二个网络通道。 其他选择的连接也是可能的。
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公开(公告)号：US20070065152A1
公开(公告)日：2007-03-22
申请号：US11162744
申请日：2005-09-21
申请人： Luca Chiesa , Giuseppe Ravasio , Mauro Casanova , Giacomo Losio
发明人： Luca Chiesa , Giuseppe Ravasio , Mauro Casanova , Giacomo Losio
IPC分类号： H04B10/00
CPC分类号： H04J3/1611 , H04J2203/0012 , H04J2203/0082 , H04L12/5692
摘要： A transponder unit which relays signals between a plurality of channels of an optical transport network and a plurality of clients. The interconnections within the transponder unit are reconfigurable for selective connections. A connection between a first client and a first network channel and a connection between a second client and a second network channel is independent of each other and may be selected so that the second client is connected to the first network channel and the first client is connected to the second network channel. Other selected connections are also possible.
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公开(公告)号：US06879422B2
公开(公告)日：2005-04-12
申请号：US10169273
申请日：2000-12-20
IPC分类号： G02F1/035 , G02F1/03 , H04B10/50 , H04B10/588 , G02F1/00 , G02F1/01 , G02F1/07 , H04B10/00 , H04B10/04
CPC分类号： H04B10/505 , H04B10/58 , H04B10/588 , H04B2210/075
摘要： Electro-optical modulator (100), comprising at least one electrical port (918, 919) and an input circuit (915, 916, 917) for the application of a modulating electrical signal to the said at least one electrical port. The said modulator also comprises a linear processing circuit (250) capable of generating a compensation signal. This linear processing circuit comprises a first terminal connected to the input circuit for taking a fraction of the said modulating electrical signal, at least one filtering element (2, 3) for eliminating predetermined spectral components from the said fraction of the modulating electrical signal, and at least one phase-shifting element (4, 6) for inverting the phase of the said fraction of the modulating electrical signal. The said linear processing circuit also comprises a second terminal capable of being connected to the said at least one electrical port for applying the compensation signal to the said electro-optical modulator.
摘要翻译： 电光调制器（100）包括至少一个电端口（918,919）和用于将调制电信号施加到所述至少一个电端口的输入电路（915,916,917）。 所述调制器还包括能够产生补偿信号的线性处理电路（250）。 该线性处理电路包括连接到输入电路以获取所述调制电信号的一部分的第一端子，至少一个滤波元件（2,3），用于消除调制电信号的所述分数中的预定频谱分量;以及 至少一个用于使调制电信号的所述分数的相位反相的移相元件（4,6）。 所述线性处理电路还包括能够连接到所述至少一个电端口的第二端子，用于将补偿信号施加到所述电光调制器。
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