公开(公告)号：US20020163696A1

公开(公告)日：2002-11-07

申请号：US09848899

申请日：2001-05-04

发明人： Jen-Fa Huang ,  Yu-Lung Lo ,  Dar-Zu Hsu ,  Chang-Yuan Hsieh

IPC分类号： H04B010/00 ,  H04B010/06 ,  H04B010/04

CPC分类号： H04J14/005 ,  G02B6/2932 ,  G02B6/29322 ,  G02B6/4215 ,  H04B10/671 ,  H04B10/69

摘要： An optical spectral coding scheme for fiber-optic code-division multiple-access (FO-CDMA) networks. The spectral coding is based on the pseudo-orthogonality of FO-CDMA codes properly written in the fiber Bragg grating (FBG) devices. For an incoming broadband optical signal, the designed Bragg wavelengths of the FBG will be reflected and spectrally coded with the written FO-CDMA address codes. Maximal-length sequence codes (M-sequence codes) are chosen as the signature or address codes to exemplify the coding and correlation processes in the FO-CDMA system. By assigning the N cyclic shifts of an M-sequence code vector to N users, the invention achieves an FO-CDMA network that can support N simultaneous users. The FO-CDMA encoding/decoding devices consist of a series of FBGs. To overcome the impact of multiple-access interference (MAI) on the performance of the FO-CDMA system, the FBG decoder is configured on the basis of orthogonal correlation functions of the nearly orthogonal M-sequence codes.

摘要翻译： 用于光纤码分多址（FO-CDMA）网络的光谱编码方案。 频谱编码基于适当写入光纤布拉格光栅（FBG）装置中的FO-CDMA码的伪正交性。 对于入射宽带光信号，FBG的设计布拉格波长将被反映并用写入的FO-CDMA地址码进行光谱编码。 选择最大长度序列码（M序列码）作为签名或地址码，以说明FO-CDMA系统中的编码和相关过程。 通过向N个用户分配M序列码矢量的N个循环移位，本发明实现了可以支持N个同时用户的FO-CDMA网络。 FO-CDMA编码/解码装置由一系列FBG组成。 为了克服多址干扰（MAI）对FO-CDMA系统性能的影响，FBG解码器基于近似正交的M序列码的正交相关函数配置。

公开(公告)号：US20020154364A1

公开(公告)日：2002-10-24

申请号：US10038576

申请日：2002-01-08

发明人： Alan Edward Green ,  Euan Morrison

IPC分类号： H04B010/00 ,  H04B010/04

CPC分类号： H04B10/2587 ,  H04B10/1125 ,  H04B10/272

摘要： An optical communications system is provided comprising first and second signalling devices in which a duplex communications link between the signalling devices can be established. The first signalling device includes a retro-reflector and the second signalling device includes at least one light source for directing light towards the retro-reflector. Half-duplex embodiments and full-duplex embodiments are described. A wave division multiplex retro-reflecting communication system is also described.

摘要翻译： 提供了一种光通信系统，其包括第一和第二信令装置，其中可以建立信令装置之间的双工通信链路。 第一信号装置包括后向反射器，第二信号装置包括至少一个用于将光引向后向反射器的光源。 描述了半双工实施例和全双工实施例。 还描述了一种波分复用后向反射通信系统。

公开(公告)号：US20020154363A1

公开(公告)日：2002-10-24

申请号：US10128357

申请日：2002-04-24

申请人： ALCATEL

发明人： Alain Granger

IPC分类号： H04B010/20 ,  H04J014/00 ,  H04B010/00

CPC分类号： H04J14/02 ,  H04J14/0226 ,  H04J14/0247 ,  H04J14/0252 ,  H04J14/0282 ,  H04J14/0298 ,  H04Q11/0067 ,  H04Q11/0071

摘要： A fiber optics network has a physical layer that can accommodate HFC type CATV communications or G.983.1 type communications. Downstream communications are performed using HFC to take advantage of the multiple simultaneous broadcast capability. Upstream communications are performed using G.983.1 to take advantage of the resistence to ingress noise and the more standardized approach offered by G.983.1.

摘要翻译： 光纤网络具有可容纳HFC型CATV通信或G.983.1型通信的物理层。 使用HFC执行下行通信以利用多个同时广播能力。 上行通信使用G.983.1进行，以利用入侵噪声的抵抗和G.983.1提供的更标准化的方法。

公开(公告)号：US20020154358A1

公开(公告)日：2002-10-24

申请号：US10127444

申请日：2002-04-23

申请人： NEC CORPORATION

发明人： Masataka Hino

IPC分类号： H04J014/02 ,  H04B010/00

CPC分类号： H04B10/0775 ,  H04B2210/071 ,  H04J14/0227 ,  H04J14/0246 ,  H04J14/025 ,  H04J14/0279

摘要： To provide a clock synchronization supervisory method of an OSC signal in a wavelength multiplexing system whereby, in the case where a slip alarm is generated by transmission line trouble, optimum clock synchronization supervision in OSC communication is performed by masking this slip alarm. A clock synchronization supervisory method of the OSC signal has a configuration wherein, in the wavelength multiplexing system for transferring a management message and user data among sequentially connected apparatuses by clock-synchronized OSC communication, each apparatus supervises clock synchronization and inserts slip alarm mask information into the OSC signal when transmission line trouble occurs so as to send it to an opposite apparatus, and the opposite apparatus takes out the slip alarm mask information from the received OSC signal and masks the slip alarm.

摘要翻译： 为了提供波长复用系统中的OSC信号的时钟同步监控方法，由此在通过传输线故障产生滑差警报的情况下，通过屏蔽该滑动报警来执行OSC通信中的最佳时钟同步监视。 OSC信号的时钟同步监控方法具有以下结构：在通过时钟同步OSC通信在顺序连接的装置之间传送管理消息和用户数据的波长复用系统中，每个装置监视时钟同步并将滑动报警掩码信息插入 发生传输线路故障时的OSC信号，将其发送到相反的装置，相对的装置从接收到的OSC信号中取出滑动报警屏蔽信息，并屏蔽滑动报警。

公开(公告)号：US20020141694A1

公开(公告)日：2002-10-03

申请号：US10097187

申请日：2002-03-13

申请人： Massachusetts Institute of Technology

发明人： David O. Caplan ,  Walid A. Atia

IPC分类号： G02B006/28 ,  H04B010/00 ,  H04B010/12

CPC分类号： H04B10/25137 ,  H04B10/505 ,  H04B10/5051 ,  H04B10/508

摘要： A system includes an optical transmitter that outputs an optical signal having a substantially Gaussian waveform and an optical receiver that is optically coupled to the optical transmitter and has an impulse response essentially matching the waveform. The impulse response and waveform preferably match in the time domain. The transmitter and receiver may be average-power-limited, using, for example, an erbium-doped fiber amplifier. To achieve a high signal-to-noise ratio, the waveform may be designed to minimize jitter, sample duration, matching parasitics, and inter-symbol interference (ISI). Such a waveform may be a return-to-zero (RZ) Gaussian or Gaussian-like waveform and may be transmitted in a variety of modulation formats. Further, the system may be used in WDM or TDM systems. A method for characterizing the time domain impulse response of an optical element used in the optical receiver is provided, where the method is optionally optimized using deconvolution and/or cross-correlation techniques.

摘要翻译： 一种系统包括：光发射机，其输出具有基本高斯波形的光信号和光接收器，光接收器光学耦合到光发射机并具有基本上与波形匹配的脉冲响应。 脉冲响应和波形优选在时域中匹配。 发射机和接收机可以是平均功率限制的，例如使用掺铒光纤放大器。 为了实现高信噪比，可以设计波形以最小化抖动，采样持续时间，匹配寄生效应和符号间干扰（ISI）。 这样的波形可以是归零（RZ）高斯或类似高斯波形的波形，并且可以以各种调制格式发送。 此外，该系统可以在WDM或TDM系统中使用。 提供了一种用于表征在光接收机中使用的光学元件的时域脉冲响应的方法，其中该方法可选地使用去卷积和/或互相关技术优化。

公开(公告)号：US20020141008A1

公开(公告)日：2002-10-03

申请号：US09811067

申请日：2001-03-16

发明人： Michel W. Chbat ,  Herve A. Fevrier ,  Pavle Gavrilovic ,  Hyunchin Kim ,  Andrej B. Puc

IPC分类号： H04B010/08 ,  H04B010/00

CPC分类号： H04B10/2941 ,  H04B10/2537

摘要： In one aspect of the invention, a system operable to reduce degradation of an optical signal to noise ratio where signals having multiple wavelengths are communicated over a common optical link includes an amplifier assembly operable to introduce to a lower communication band a first gain and to introduce to a higher communication band a second gain that is different from the first gain. In addition, the system is operable to introduce a variable gain tilt into at least one of the communication bands. The different gains introduced to the higher and lower bands and the variable gain tilt introduced into at least one of the bands result in a reduction of a degradation of optical signal to noise ratio that could otherwise be caused by wavelength dependent attenuation when the communication bands are combined and communicated over an optical link.

摘要翻译： 在本发明的一个方面，一种可操作以减少光信噪比的劣化的系统，其中具有多个波长的信号通过公共光链路进行通信，该放大器组件可操作以向较低通信频带引入第一增益并引入 向较高通信频带提供不同于第一增益的第二增益。 此外，该系统可操作地将可变增益倾斜引入到至少一个通信频带中。 引入到较高和较低频带的不同增益和引入至少一个频带中的可变增益倾斜导致光信噪比的降低，否则当通信频带为 通过光链路组合和传送。

公开(公告)号：US20020135837A1

公开(公告)日：2002-09-26

申请号：US09986539

申请日：2001-11-09

申请人： MITSUBISHI DENKI KABUSHIKI KAISHA

发明人： Masatoshi Katayama

IPC分类号： H04J014/02 ,  H04B010/00

CPC分类号： H04J14/0226 ,  H04J14/0232 ,  H04J14/0246 ,  H04J14/025 ,  H04J14/0282

摘要： A signal transmission system includes a first transmission unit for distributing and transmitting a downward optical signal from a downward signal transmitting unit to a plurality of downward signal receiving units, and a second transmission unit for multiplexing a plurality of upward optical signals applied thereto and transmitting the plurality of upward optical signals multiplexed, and for distributing and transmitting a downward signal applied thereto. The system also comprises a first WDM unit for applying the plurality of upward optical signals multiplexed and transmitted thereto by the second transmission unit to an upward signal receiving unit, and for applying an optical signal transmitted by an information transmitting unit, as a downward optical signal, to the second transmission unit, and a second WDM unit for applying a plurality of upward optical signal transmitted by a plurality of upward signal transmitting units to the second transmission unit, and for applying the optical signal from the information transmitting unit transmitted thereto by the second transmission unit to an information receiving unit.

摘要翻译： 信号传输系统包括：第一传输单元，用于从下行信号发送单元向多个下行信号接收单元分配和发送向下的光信号;以及第二传输单元，用于复用施加到其上的多个向上的光信号，并传送 多个向上的光信号被复用，并且用于分配和发送施加到其上的向下信号。 该系统还包括第一WDM单元，用于将由第二传输单元复用并传输到其中的多个向上光信号应用于上行信号接收单元，并且用于将由信息发送单元发送的光信号作为下行光信号 以及第二WDM单元，用于将由多个向上信号发送单元发送的多个向上光信号施加到第二发送单元，并且用于将来自发送到其的信息发送单元的光信号施加到第二发送单元 第二传输单元连接到信息接收单元。

公开(公告)号：US20020131130A1

公开(公告)日：2002-09-19

申请号：US10096121

申请日：2002-03-07

申请人： LightPointe Communications, Inc.

发明人： Gerald R. Clark

IPC分类号： H04B010/00

CPC分类号： H04B10/1125 ,  H04Q11/0062 ,  H04Q11/0067 ,  H04Q2011/0026

摘要： The present invention provides a system and method for optical communication. The system includes a first rooftop transceiver mounted on a building and configured to transmit and receive optical signals over free space. A first passive optical deflector (POD) is mounted on the building and optically aligned with both the first rooftop transceiver and a first customer premise equipment (CPE), wherein the first POD is configured to receive a first optical signal from the first rooftop transceiver and redirect substantially all of the first optical signal to the first CPE providing a first optical communication path between the first rooftop transceiver and the first CPE. The first POD is further configured to receive a second optical signal from the first CPE and to redirect substantially all of the second optical signal to additional equipment extending the first communication path between the first CPE and the additional equipment.

摘要翻译： 本发明提供了一种用于光通信的系统和方法。 该系统包括安装在建筑物上并被配置为在自由空间上发送和接收光信号的第一屋顶收发器。 第一无源光偏转器（POD）安装在建筑物上并且与第一屋顶收发器和第一客户驻地设备（CPE）两者光学对准，其中第一POD被配置为从第一屋顶收发器接收第一光信号， 基本上将所有第一光信号重定向到第一CPE，从而在第一屋顶收发器和第一CPE之间提供第一光通信路径。 第一POD还被配置为从第一CPE接收第二光信号，并且将基本上所有的第二光信号重定向到扩展第一CPE和附加设备之间的第一通信路径的附加设备。

公开(公告)号：US20020126359A1

公开(公告)日：2002-09-12

申请号：US09875032

申请日：2001-06-07

发明人： Alan H. Gnauck ,  Antonio Mecozzi ,  Mark Shtaif ,  Jay Wiesenfeld

IPC分类号： H04B010/00 ,  H04B010/12

CPC分类号： H04B10/5055 ,  H04B10/2513 ,  H04B10/503 ,  H04B10/524 ,  H04L25/4906

摘要： A system and method for increasing transmission distance and/or transmission data rates using tedons and an encoding scheme to reduce the number of ones in a data signal is decribed. The method for increasing transmission distance and transmission data rate of a fiber optical communications link using tedons comprises the steps of encoding a data signal to be transmitted using an encoding scheme that reduces a number of ones in said data signal, transmitting said encoded data signal over said fiber optical communications link, receiving said encoded data signal and decoding said encoded data signal. The system for increasing transmission distance and transmission data rate of a fiber optical communications link using tedons comprises means for encoding a data signal to be transmitted using an encoding scheme that reduces a number of ones in said data signal, means for transmitting said encoded data signal over said fiber optical communications link, means for receiving said encoded data signal and means for decoding said encoded data signal.

摘要翻译： 描述了使用信号增加传输距离和/或传输数据速率的系统和方法以及用于减少数据信号中的数量的编码方案。 使用信号增加光纤通信链路的传输距离和传输数据速率的方法包括以下步骤：使用减少所述数据信号中的数量的编码方案对待发送的数据信号进行编码，将所述编码数据信号发送 所述光纤通信链路接收所述编码数据信号并解码所述编码数据信号。 用于增加使用信号的光纤通信链路的传输距离和传输数据速率的系统包括用于使用减少所述数据信号中的数量的编码方案对待传输的数据信号进行编码的装置，用于发送所述编码数据信号的装置 通过所述光纤通信链路，用于接收所述编码数据信号的装置和用于解码所述编码数据信号的装置。

公开(公告)号：US20020126355A1

公开(公告)日：2002-09-12

申请号：US10074001

申请日：2002-02-14

申请人： ALCATEL

发明人： Henning Bulow

IPC分类号： H04B010/00 ,  H04B010/12

CPC分类号： H04B10/2513 ,  H04B10/2569

摘要： An arrangement and a method are disclosed for compensating for distortion in an optical signal having data modulated thereon which was caused by distortion effects on an optical fiber link, using a dispersion compensator which processes the incoming optical signal such that an optical or electric signal having the data of the input signal modulated thereon is provided at its output, with the output signal of the dispersion compensator exhibiting a distortion reduced from that of the input signal. The arrangement and the method are characterized in that the dispersion compensator is preceded by an optical bandpass filter which limits the spectral range of the incoming optical signal to a narrower range. In this way, even optical signal distortion due to higher-order dispersion effects can be selectively compensated for with simple technical means such that greater link lengths and more reliable adaptation to varying transmission conditions become possible.

摘要翻译： 公开了一种布置和方法，用于补偿具有调制在其上的数据的光信号中的失真，其由光纤链路上的失真影响引起，使用色散补偿器，该色散补偿器处理入射光信号，使得具有 在其输出处提供其上调制的输入信号的数据，其中色散补偿器的输出信号表现出与输入信号的失真相反的失真。 该装置和方法的特征在于，色散补偿器之前是光带通滤波器，其将入射光信号的光谱范围限制到较窄的范围。 以这种方式，由于较高阶色散效应导致的均匀的光信号失真可以用简单的技术手段进行选择性补偿，使得更大的链路长度和对可变传输条件的更可靠的适应变得可能。