公开(公告)号：US06999678B2

公开(公告)日：2006-02-14

申请号：US10004200

申请日：2001-11-01

Applicant: Sacha Corbeil ,  Rajkumar Nagarajan ,  Ross Saunders

Inventor： Sacha Corbeil ,  Rajkumar Nagarajan ,  Ross Saunders

IPC: G02F1/00 ,  H04J14/00 ,  H04B10/12

CPC classification number: H04B10/25137

Abstract: An adaptive method is provided for applying chirp to an optical signal traversing through an optical network. The adaptive method comprises: applying chirp to an optical data signal at a transmitter in the optical network; transmitting the optical data signal through the optical network, the optical data signal having error detection data embedded therein; determining an error rate for the optical data signal at an egress point of the optical network, where the error rate is based on the error detection data embedded in the optical data signal; transmitting the error rate for the optical data signal to the transmitter; and adjusting the chirp being applied to the optical data signal at the transmitter based on the error rate for the optical data signal.

公开(公告)号：US07260324B2

公开(公告)日：2007-08-21

申请号：US10241186

申请日：2002-09-11

Applicant: Chris Passier ,  David Atkinson ,  Carl Krentz ,  Madhu Krishnaswamy ,  Jean Guy Chauvin ,  Andrew Robinson ,  Rajkumar Nagarajan

Inventor： Chris Passier ,  David Atkinson ,  Carl Krentz ,  Madhu Krishnaswamy ,  Jean Guy Chauvin ,  Andrew Robinson ,  Rajkumar Nagarajan

IPC: H04B10/08

CPC classification number: H04J14/0221 ,  H04B10/077 ,  H04B10/07955 ,  H04J14/0226 ,  H04J14/0227

Abstract: An automatic optical power management system for use with an optical communications system includes a light source residing in a first circuit pack and adapted to emit light at a nominal power level only absent receipt of an indicator signifying a loss of signal resulting from a fiber discontinuity relating to the first optical fiber, wherein the nominal power level is of sufficient magnitude to violate laser safety guidelines in the event of the fiber discontinuity. A redundant detection system includes a first optical detector residing in the first circuit pack, and a second optical detector residing in a second circuit pack that is optically adjacent to the first circuit. A redundant response system communicates an indicator signifying loss of signal from the first and second optical detectors to the light source upon detection of loss of signal by either detector.

Abstract translation: 一种与光通信系统一起使用的自动光功率管理系统包括位于第一电路板中的光源，并且适于以标称功率电平发光，仅在没有接收到表示由于光纤不连续性引起的信号损失的指示符 到第一光纤，其中在光纤不连续的情况下，标称功率电平具有足够的量级以违反激光安全准则。 冗余检测系统包括驻留在第一电路板中的第一光学检测器和位于与第一电路光学相邻的第二电路板中的第二光学检测器。 在通过任一个检测器检测到信号丢失时，冗余响应系统将表示从第一和第二光学检测器的信号损失指示给光源。

公开(公告)号：US07099597B2

公开(公告)日：2006-08-29

申请号：US09927680

申请日：2001-08-10

Applicant: Ross Alexander Saunders ,  Rajkumar Nagarajan ,  Hanan Anis ,  Andrew Robinson ,  Sacha Corbeil

Inventor： Ross Alexander Saunders ,  Rajkumar Nagarajan ,  Hanan Anis ,  Andrew Robinson ,  Sacha Corbeil

IPC: H04B10/04

CPC classification number: H04B10/25137

Abstract: An iterative process is used to set the phase prechirp of a WDM optical transport system to a system's optimal level that maximizes the signal quality. A signal degradation factor takes into account linear and non-linear effects along the optical path and is used as a receive end feedback signal to control the phase prechirp level at the transmitter site. By using the FEC corrected errors rate as the feedback signal, optimization of signal quality is performed even when the system is running error free. By using an adaptive phase prechirp transmitter, signal degradation compensation can be also performed on a per wavelength basis to compensate for the residual dispersion slope and to allow optimization of individual channels independently of the net link dispersion value.This method provides more flexibility when using optical switching in core networks, as it allows path optimization to new physical link connectivity, without requiring any change to the optical components such that, significant signal degradation tuning range for a WDM optical transport system is provided.

公开(公告)号：US07013091B2

公开(公告)日：2006-03-14

申请号：US10050738

申请日：2002-01-16

Applicant: Sacha Corbeil ,  David Atkinson ,  Paul Fecteau ,  Rajkumar Nagarajan

Inventor： Sacha Corbeil ,  David Atkinson ,  Paul Fecteau ,  Rajkumar Nagarajan

IPC: H04B10/00

CPC classification number: H04B10/505 ,  H04B10/5051 ,  H04B10/5057 ,  H04B10/50577 ,  H04B10/508

Abstract: In accordance with the present invention, an improved method is provided for synchronizing a pulse stream with a data stream in an optical communications system. The improved method includes: generating an optical data signal for transmission through the optical communication system, where the data stream exhibits a duty cycle less than fifty percent and the optical data signal is formed from the pulse stream and the data stream; detecting an optical power level associated with the optical data signal; and synchronizing the pulse stream with the data stream based on the optical power level associated with the optical data signal. Specifically, the pulse stream is temporally aligned with the data stream when the average power of the optical data signal is maximized.

Abstract translation: 根据本发明，提供了一种用于在脉冲流与光通信系统中的数据流同步的改进方法。 改进的方法包括：产生用于通过光通信系统传输的光数据信号，其中数据流的占空比小于百分之五十，光数据信号由脉冲流和数据流形成; 检测与所述光学数据信号相关联的光功率电平; 以及基于与所述光学数据信号相关联的光功率电平使所述脉冲流与所述数据流同步。 具体地说，当光数据信号的平均功率最大化时，脉冲流在时间上与数据流对齐。

公开(公告)号：US06204954B1

公开(公告)日：2001-03-20

申请号：US09401522

申请日：1999-09-22

Applicant: Rajkumar Nagarajan

Inventor： Rajkumar Nagarajan

IPC: G02F101

CPC classification number: G02F1/0123

Abstract: In an optical communication system, efficient use of a Mach-Zehnder modulator requires accurate knowledge of the AC halfwave voltage at the desired modulation frequency. At high modulation frequencies this can be difficult to measure directly. A method of accurately measuring the AC halfwave voltage of a Mach-Zehnder modulator is described. The Mach-Zehnder modulator is biased at the peak of the transfer function curve and a sinusoidal signal of known amplitude and the desired frequency of measurement is applied. The optical power is measured with and without the sinusoidal signal. The ratio of the two optical powers is used in the Mach-Zehnder transfer equation to calculate the AC halfwave voltage.

Abstract translation: 在光通信系统中，有效使用马赫 - 曾德调制器需要在所需调制频率下精确地了解交流半波电压。 在高调制频率下，这可能难以直接测量。 描述了一种精确测量马赫 - 曾德尔调制器的交流半波电压的方法。 马赫曾德调制器偏置在传递函数曲线的峰值处，并且应用已知幅度的正弦信号和期望的测量频率。 在有和没有正弦信号的情况下测量光功率。 在Mach-Zehnder传递方程中使用两个光功率的比率来计算交流半波电压。