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1. 发明授权

US5436749A Method and apparatus for predistortion 失效
标题翻译：预失真的方法和装置
公开(公告)号：US5436749A
公开(公告)日：1995-07-25
申请号：US805251
申请日：1991-12-09
申请人： Rezin E. Pidgeon, Jr. , Heather H. Rand
发明人： Rezin E. Pidgeon, Jr. , Heather H. Rand
IPC分类号： H04B10/18 , H04B10/00 , H04B10/04
CPC分类号： H04B10/2507
摘要： A predistortion circuit for an optical communications system includes a main path for an RF modulating signal and a predistortion path for a predistortion signal, which signals are combined to modulate a laser diode. The distortion path includes a distortion generator which generates a distortion signal which is substantially the same as the distortion generated by the modulation of the transmission system with the RF modulating signals. In one implementation, the distortion generator comprises a square law device which preferably is a field effect type device. The square law device operational characteristic closely mimics the major component of distortion in optical communications systems, composite second order (CSO) distortion. In a second implementation, two square law devices are coupled in an anti-phase arrangement to substantially cancel odd order distortion components from the distortion signal and to enhance even order distortion components, particularly CSO. Another implementation illustrates a dual output distortion generator which allows for the selection of either an in phase or inverted phase distortion signal to be able to compensate for sublinear and superlinear laser diode curves without a separate phase inverter. Still another implementation of the predistortion circuit provides for the independent amplitude adjustment of different bands of the CATV spectrum to permit compensation for different channel loadings, channel spacings and channel amplitudes.
摘要翻译：用于光通信系统的预失真电路包括用于RF调制信号的主路径和用于预失真信号的预失真路径，该信号被组合以调制激光二极管。失真路径包括失真发生器，其产生与通过RF调制信号的传输系统的调制产生的失真基本相同的失真信号。在一个实现中，失真发生器包括平方律装置，其优选地是场效应型装置。平方律设备的操作特性极大地模拟了光通信系统失真的主要组成部分，复合二阶（CSO）失真。在第二实施例中，两个平方律装置以反相布置耦合，以从失真信号基本上消除奇数阶失真分量，并增强偶数阶失真分量，特别是CSO。另一个实施例示出了双输出失真发生器，其允许选择同相或反相失真信号，以便能够补偿没有单独的相位逆变器的亚线性和超线性激光二极管曲线。预失真电路的另一个实施方案提供了CATV频谱的不同频带的独立幅度调整，以允许补偿不同的信道负载，信道间隔和信道幅度。

2. 发明授权

US5481389A Postdistortion circuit for reducing distortion in an optical communications system 失效
标题翻译：用于减少光通信系统中的失真的后失真电路
公开(公告)号：US5481389A
公开(公告)日：1996-01-02
申请号：US958976
申请日：1992-10-09
申请人： Rezin E. Pidgeon , Heather H. Rand
发明人： Rezin E. Pidgeon , Heather H. Rand
IPC分类号： H03F1/32 , H04B10/158 , H04B10/17 , H04B10/18 , H04B10/08
CPC分类号： H04B10/2933 , H03F1/32 , H04B10/25133 , H04B10/6973 , H04B2210/252
摘要： A postdistortion network for a receiver at a receiver location in an optical transmission system is disclosed. The receiver converts an optical signal carried over an optical transmission link to an RF signal. The postdistortion network includes an input terminal for receiving the RF signal and a distortion generator for generating a distortion signal from the RF signal. An adjusting circuit for adjusts the phase and amplitude of the distortion signal based on distortion at said receiver location. The adjusted distortion signal is combined with the RF signal in order to cancel or substantially suppress distortion in the RF input signal. The present invention permits individual receivers in an optical transmission system to be compensated for distortion which may be unique to that receiver location. A communications system including a predistortion network and a postdistortion network is also disclosed.
摘要翻译：公开了一种用于在光传输系统中的接收机位置处的接收机的后失真网络。接收机将通过光传输链路承载的光信号转换为RF信号。后失真网络包括用于接收RF信号的输入端子和用于从RF信号产生失真信号的失真发生器。一种用于基于所述接收器位置处的失真来调整失真信号的相位和幅度的调整电路。调整的失真信号与RF信号组合以消除或基本上抑制RF输入信号中的失真。本发明允许对光传输系统中的各个接收机进行补偿，这对于该接收机位置可能是唯一的。还公开了一种包括预失真网络和后失真网络的通信系统。

3. 发明授权

US5267071A Signal level control circuitry for a fiber communications system 失效
标题翻译：用于光纤通信系统的信号电平控制电路
公开(公告)号：US5267071A
公开(公告)日：1993-11-30
申请号：US754029
申请日：1991-09-03
申请人： Frank R. Little , John G. Megna , Heather H. Rand , Frederick T. Zendt
发明人： Frank R. Little , John G. Megna , Heather H. Rand , Frederick T. Zendt
IPC分类号： H03G3/20 , H03G3/30 , H04B3/04 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/152 , H04B10/00
CPC分类号： H03G3/3084 , H04B10/0775 , H04B10/2931 , H04B10/5053 , H04B10/674 , H04B10/697
摘要： A system for signal level control in AM fiber systems is provided. The system provides level controls at both transmitter and receiver ends of the fiber transmission system, utilizing compensation and control techniques at each end to maintain and optimize the performance of the system. The transmitter includes two stage level control based on a composite power level of a detected RF signal. The receiver includes two stage level control based on a pilot channel filtered from the channels transmitted to the receiver.
摘要翻译：提供了一种用于AM光纤系统中信号电平控制的系统。该系统在光纤传输系统的发射机和接收机端提供电平控制，利用每端的补偿和控制技术来维护和优化系统的性能。发射机包括基于检测到的RF信号的复合功率电平的两级级控制。接收机包括基于从发射到接收机的信道滤波的导频信道的两级级控制。

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