公开(公告)号：US06377378B1

公开(公告)日：2002-04-23

申请号：US09220332

申请日：1998-12-24

申请人： Massimo Frascolla ,  Filippo Bentivoglio Ravasio ,  Paolo Ottolenghi ,  Steffen Schmid

发明人： Massimo Frascolla ,  Filippo Bentivoglio Ravasio ,  Paolo Ottolenghi ,  Steffen Schmid

IPC分类号： H04J1402

CPC分类号： H04B10/2572 ,  H04B10/291

摘要： An apparatus and method for reducing polarization hole burning in a rare-earth-doped fiber amplifier within an optical communication system by converting an optical carrier having a characteristic wavelength into a polarization-rotating optical carrier is disclosed. The apparatus includes a polarization-fixing device optically coupled in the optical transmission system to transform the optical carrier to a polarized optical carrier, and an acousto-optic modulator positioned to receive a first portion of the polarized optical carrier and to orthogonally convert the polarization of the polarized optical carrier and to shift the polarized optical carrier by a modulation frequency. The apparatus and method further includes a polarization beam combiner optically coupled to receive the orthogonally polarization converted and frequency shifted polarized signal and a portion of the original polarized optical carrier. The polarization beam combiner produces a polarization-rotating carrier signal that is transmitted downstream in the optical communication system to a rare-earth-doped fiber amplifier.

摘要翻译： 公开了一种用于通过将具有特征波长的光载体转换成偏振旋转光载体来减少光通信系统内的稀土掺杂光纤放大器中的极化孔燃烧的装置和方法。 该装置包括光耦合在光传输系统中以将光载波转换成偏振光载波的偏振固定装置，以及声光调制器，定位成接收偏振光载波的第一部分，并正交地将 偏振光载波并使偏振光载波偏移调制频率。 该装置和方法还包括光耦合以接收正交偏振转换和偏移偏振信号的偏振光束组合器以及原始偏振光学载体的一部分。 偏振光束组合器产生在光通信系统中向下游发送到稀土掺杂光纤放大器的偏振旋转载波信号。

公开(公告)号：US06236777B1

公开(公告)日：2001-05-22

申请号：US09075868

申请日：1998-05-12

申请人： Filippo Bentivoglio Ravasio ,  Paolo Ottolenghi

发明人： Filippo Bentivoglio Ravasio ,  Paolo Ottolenghi

IPC分类号： G02B628

CPC分类号： H04B10/2918 ,  H04B2210/003

摘要： An improvement in the reliability of an optical communication system comprising two optical fiber lines, a first transmitter for transmitting at least a signal in the first optical line, a second transmitter for transmitting at least a signal in the second optical line, at least one two-stage-amplifier in each of said first and second line, laser pumps providing pumping signals to said stages of the amplifiers, a first receiver for receiving the signal from the first optical line, and a second receiver for receiving the signal from the second optical line, wherein said laser pumps form a single system that provides a first pumping signal to at least one stage of said at least one amplifier of each of said first and second line.

摘要翻译： 包括两个光纤线路的光通信系统的可靠性的改进，用于发送第一光线路中的至少一个信号的第一发射机，用于在第二光线路中发送至少一个信号的第二发射机，至少一个二 在所述第一和第二线路的每一个中的阶段放大器，向放大器的所述级提供泵浦信号的激光泵，用于从第一光学线路接收信号的第一接收器和用于从第二光学器件接收信号的第二接收器 线，其中所述激光泵形成单个系统，其向所述第一和第二线中的每一个的所述至少一个放大器的至少一个级提供第一泵浦信号。

公开(公告)号：US06583905B1

公开(公告)日：2003-06-24

申请号：US09315265

申请日：1999-05-20

申请人： Gainluca Bonato ,  Mauro Macchi ,  Paolo Ottolenghi

发明人： Gainluca Bonato ,  Mauro Macchi ,  Paolo Ottolenghi

IPC分类号： H04B1000

CPC分类号： H04B10/2519 ,  H04B10/25137 ,  H04B10/255 ,  H04B2210/252

摘要： An optical transmission system and method for reducing non-linear distortion caused by the interaction of Self-Phase Modulation and Group Velocity Dispersion is disclosed. An optical link includes a transmitter for providing signals at a first optical wavelength, a transponder for converting the first optical wavelength to a second optical wavelength, a plurality of spans of optical transmission fiber and optical fiber amplifiers, a dispersion compensating device, and a receiver. The system operates at a relatively high input power level. The transponder includes a device for smoothing edges of the rise and fall times of optical pulses, such as an electrical attenuator and low pass filter, so that sharp-edged pulses received from the transmitter are transformed to a Gaussian shape. A dispersion compensating device, such as an optical fiber grating, also helps to improve the bit error rate as a function of receiver sensitivity despite an overall link length less than 600 km.

摘要翻译： 公开了一种用于减少由自相位调制和组速度色散相互作用引起的非线性失真的光传输系统和方法。 光链路包括用于以第一光波长提供信号的发射机，用于将第一光波长转换为第二光波长的转发器，多个光传输光纤和光纤放大器的跨度，色散补偿装置和接收器 。 该系统以较高的输入功率电平工作。 应答器包括用于平滑光脉冲的上升和下降时间的边缘的装置，例如电衰减器和低通滤波器，使得从发射器接收的尖锐脉冲变换为高斯形状。 诸如光纤光栅之类的色散补偿装置也有助于提高作为接收机灵敏度的函数的误码率，尽管总长度小于600公里。

公开(公告)号：US06498665B1

公开(公告)日：2002-12-24

申请号：US09377747

申请日：1999-08-20

申请人： Corinne Chauzat ,  Paolo Ottolenghi ,  Stephane Ruggeri ,  Michel Sotom

发明人： Corinne Chauzat ,  Paolo Ottolenghi ,  Stephane Ruggeri ,  Michel Sotom

IPC分类号： H04J1402

CPC分类号： H04Q11/0005 ,  H04J14/0206 ,  H04J14/0212 ,  H04J14/0213 ,  H04J14/0219 ,  H04J14/0221 ,  H04Q2011/0009 ,  H04Q2011/0016 ,  H04Q2011/0022 ,  H04Q2011/0024 ,  H04Q2011/0049

摘要： The system includes processors each of which can drop an optical signal contained in one channel of an incoming optical multiplex signal and add an optical signal to the multiplex signal channel thereby made available. Each processor includes an optical signal drop filter and an optical signal add filter for an individual channel of particular wavelength, and these filters are connected by an optical switch. The drop filters and the add filters of the circuits of the system are connected in series, some in a drop subsystem and the others in an add subsystem, to transmit the multiplex signal from one filter to the other and from the drop subsystem to the add subsystem. They are distributed in order of decreasing drop or add wavelength from the input of the system at which the incoming multiplex signal is received.

摘要翻译： 该系统包括处理器，每个处理器可以丢弃包含在输入光复用信号的一个通道中的光信号，并将光信号添加到多路复用信号通道，从而使其可用。 每个处理器包括用于特定波长的单独信道的光信号丢弃滤波器和光信号添加滤波器，并且这些滤波器由光开关连接。 系统的电路的放大滤波器和加法滤波器串联连接，一些在一个子系统中，另一个在一个加法子系统中，以将多路复用信号从一个滤波器传输到另一个滤波器，并从该子系统发送到加法器 子系统。 它们按照从接收输入复用信号的系统的输入减小或添加波长的顺序分布。

公开(公告)号：US06191854B1

公开(公告)日：2001-02-20

申请号：US09102759

申请日：1998-06-23

申请人： Giorgio Grasso ,  Aldo Righetti ,  Paolo Ottolenghi ,  Fabio Donati

发明人： Giorgio Grasso ,  Aldo Righetti ,  Paolo Ottolenghi ,  Fabio Donati

IPC分类号： H01S300

CPC分类号： H04B10/25253 ,  H04B2210/252

摘要： Optical telecommunications system, comprising: a transmitting station capable of emitting an optical signal having a power of between 18 and 30 dBm; an optical fibre transmission line capable of transmitting the said optical signal, comprising dispersion shifted fibre with a length of between 100 km and 1000 km; an optical receiving station, capable of receiving the said optical signal; which comprises, between the said transmission line and the said optical receiver, a chromatic dispersion compensator. Preferably the said optical fibre transmission line has a length of between 200 and 400 km.

摘要翻译： 光通信系统，包括：能够发射功率在18和30dBm之间的光信号的发射台;能够传输所述光信号的光纤传输线，包括长度在100公里和 1000km;能够接收所述光信号的光接收站;在所述传输线和所述光接收器之间包括色散补偿器。优选地，所述光纤传输线的长度为200-400 公里。