公开(公告)号：US06445848B1

公开(公告)日：2002-09-03

申请号：US09674419

申请日：2000-10-31

申请人： Mohammed N. Islam ,  George A. Nowak ,  Tiejun Xia

发明人： Mohammed N. Islam ,  George A. Nowak ,  Tiejun Xia

IPC分类号： G02B628

CPC分类号： H04B10/25077 ,  G02F1/3519

摘要： Disclosed is an optical circuit for filtering and frequency modulation of soliton signal pulses traveling over long spans of waveguide fiber. The circuit makes use of the filtering properties of a non-linear optical loop mirror (NOLM). The time difference between control pulses and signal pulses co-propagating in the NOLM is controlled to increase or decrease the centroid shift of the signal pulses. The signal and control pulse streams are derived from a single stream of soliton pulses. The NOLM serves to filter low power noise from the soliton signal pulses at the same time as it shifts the centroid frequency of the soliton signal pulses up or down. The circuit can be inserted at advantageous points along a waveguide fiber transmission line to allow propagation of solitons, without electronic regeneration, over line lengths of 100 km.

摘要翻译： 公开了一种用于对在波导纤维的长跨度上行进的孤子信号脉冲进行滤波和频率调制的光电路。 该电路利用非线性光学环路反射镜（NOLM）的滤波特性。 在NOLM中共同传播的控制脉冲和信号脉冲之间的时间差被控制以增加或减小信号脉冲的质心移动。 信号和控制脉冲流源自单个孤子脉冲流。 NOLM用于从孤子信号脉冲中滤除低功率噪声，同时它们将孤子信号脉冲的质心频率向上或向下移动。 电路可以沿着波导纤维传输线的有利点插入，以允许在100公里的线路长度上无需电子再生的孤子的传播。

公开(公告)号：US06549702B2

公开(公告)日：2003-04-15

申请号：US10234810

申请日：2002-09-04

申请人： Mohammed N. Islam ,  George A. Nowak ,  Jaeyoun Kim

发明人： Mohammed N. Islam ,  George A. Nowak ,  Jaeyoun Kim

IPC分类号： G02B616

CPC分类号： G02B6/29376 ,  G02B6/274 ,  G02B6/2766 ,  G02F1/3513 ,  H04B10/25077 ,  H04B10/506

摘要： A method and system are disclosed for generating a broadband spectral continuum using short spans of constant-dispersion, dispersion-shifted fibers. The continuum generation results from the combined effects of pulse compression and spectral shaping. Pulse compression is achieved through soliton-effect compression in one or more stages of anomalous dispersion fiber, which lengths are determined by the occurrence of the first optimal compression of the corresponding order of soliton. The spectral shape results from 3rd order dispersion effects on the evolution of the pulse shape as it propagates through the final segment(s) of the fiber span. The pulse area of the incident pulse determines the fiber properties required to optimize compression. The sign and magnitudes of the 2nd and 3rd order dispersions in the final span(s) as well as the pulse width at the input to the final span determine the continuum extent, flatness and symmetry. The continuum generated in this manner is coherent and stable, making it an attractive alternative as a spectrally-sliced source for short pulse, multiple wavelength channels.

公开(公告)号：US06480656B1

公开(公告)日：2002-11-12

申请号：US09253852

申请日：1999-02-19

申请人： Mohammed N. Islam ,  George A. Nowak ,  Jaeyoun Kim

发明人： Mohammed N. Islam ,  George A. Nowak ,  Jaeyoun Kim

IPC分类号： G02B616

CPC分类号： G02B6/29376 ,  G02B6/274 ,  G02B6/2766 ,  G02F1/3513 ,  H04B10/25077 ,  H04B10/506

摘要： A method and system are disclosed for generating a broadband spectral continuum using short spans of constant-dispersion, dispersion-shifted fibers. The continuum generation results from the combined effects of pulse compression and spectral shaping. Pulse compression is achieved through soliton-effect compression in one or more stages of anomalous dispersion fiber, which lengths are determined by the occurrence of the first optimal compression of the corresponding order of soliton. The spectral shape results from 3rd order dispersion effects on the evolution of the pulse shape as it propagates through the final segment(s) of the fiber span. The pulse area of the incident pulse determines the fiber properties required to optimize compression. The sign and magnitudes of the 2nd and 3rd order dispersions in the final span(s) as well as the pulse width at the input to the final span determine the continuum extent, flatness and symmetry. The continuum generated in this manner is coherent and stable, making it an attractive alternative as a spectrally-sliced source for short pulse, multiple wavelength channels.

摘要翻译： 公开了一种方法和系统，用于使用恒定色散，色散位移光纤的短跨度生成宽带光谱连续谱。 连续谱产生的结果是脉冲压缩和光谱整形的组合效应。 通过孤波效应压缩在一个或多个异常色散光纤阶段实现脉冲压缩，其长度由相应的孤子阶数的第一最佳压缩的出现确定。 光谱形状来自三阶色散效应，当脉冲形状传播通过光纤跨度的最后一段时，脉冲形状的演变。 入射脉冲的脉冲面积决定了优化压缩所需的光纤特性。 最终跨度中的二阶和三阶分散的符号和幅度以及在最后一个跨度的输入处的脉冲宽度决定了连续范围，平坦度和对称性。 以这种方式产生的连续体是相干和稳定的，使其成为短脉冲，多波长通道的光谱切片源的有吸引力的替代品。