公开(公告)号：US5910852A

公开(公告)日：1999-06-08

申请号：US759792

申请日：1996-12-03

申请人： Flavio Fontana ,  Federico Franzoso ,  Giuseppe Ravasio ,  Claudio Zammarchi

发明人： Flavio Fontana ,  Federico Franzoso ,  Giuseppe Ravasio ,  Claudio Zammarchi

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。

公开(公告)号：US06181466B2

公开(公告)日：2001-01-30

申请号：US09138361

申请日：1998-08-21

申请人： Federico Franzoso ,  Aurelio Pianciola

发明人： Federico Franzoso ,  Aurelio Pianciola

IPC分类号： H01S300

CPC分类号： G02B6/2835

摘要： A twin coupler system includes first and second optical couplers that couple a multimode pump fiber into a double-clad active primary fiber. The pump fiber carries multimode pump power from a multimode source. The primary fiber, on the other hand, carries optical information signals on the single mode core that are amplified through the pump power. A system and method for manufacturing the twin coupler system constructs the first coupler by preparing first portions of the primary and pump fibers for coupling and performing fusion and tapering operations on the primary and pump fibers at the first portions, and constructs the second coupler by preparing second portions of the primary and pump fibers for coupling and performing fusion and tapering operations on the primary and pump fibers at the second portions. The fusion and tapering operations at the second portions are dependent upon the fusion and tapering operations performed at the first portions so as to achieve a maximum coupling efficiency of the pump power from the pump fiber to the primary fiber for the entire twin coupler system.

摘要翻译： 双耦合器系统包括将多模泵浦光纤耦合到双包层活性主光纤中的第一和第二光耦合器。 泵浦光纤从多模源提供多模泵浦功率。 另一方面，主光纤在单模核上承载通过泵浦功率放大的光信息信号。 用于制造双耦合器系统的系统和方法通过制备初级和泵浦光纤的第一部分来构造第一耦合器，用于在第一部分处耦合并执行初级和泵浦光纤上的熔融和锥形操作，并通过制备第二耦合器构建第二耦合器 主和泵浦纤维的第二部分用于在第二部分处耦合并在主纤维和泵浦纤维上进行熔融和锥形操作。 在第二部分处的熔化和锥形操作取决于在第一部分执行的熔化和锥形操作，以便实现整个双连接器系统的泵功率从泵浦光纤到主光纤的最大耦合效率。