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    Method and apparatus for transmitting a signal using simultaneous FM and AM modulation
    42.
    发明申请
    Method and apparatus for transmitting a signal using simultaneous FM and AM modulation 审中-公开

    公开(公告)号：US20060029397A1

    公开(公告)日：2006-02-09

    申请号：US11084633

    申请日：2005-03-18

    申请人： Daniel Mahgerefteh ,  Yasuhiro Matsui ,  Parviz Tayebati ,  Xueyan Zheng

    发明人： Daniel Mahgerefteh ,  Yasuhiro Matsui ,  Parviz Tayebati ,  Xueyan Zheng

    IPC分类号： H04B10/04

    CPC分类号： H04B10/508

    摘要： There is provided method for transmitting binary data contained in respective successive time cells, the data being in the form of an optical signal obtained by amplitude modulation and frequency modulation of an optical carrier wave, with a 0 bit data value having a 0 bit mean amplitude having a 0 bit amplitude time duration and a 0 bit frequency having a 0 bit frequency duration, and a 1 bit data value having a 1 bit mean amplitude having a 1 bit amplitude time duration and a 1 bit frequency having a 1 bit frequency duration; the improvement wherein: independently adjusting the 0 bit mean amplitude relative to the 1 bit mean amplitude; independently adjusting the 0 bit frequency relative to the 1 bit frequency; and independently adjusting time duration of the frequency profile of the 1 bit relative to the time duration of the amplitude profile of the 1 bit, whereby to extend the error-free propagation of the optical signal though a dispersive optical fiber beyond the dispersion limit. There is provided a method for transmitting Non-Return-To-Zero (NRZ) binary data contained in respective successive time cells, the data being in the form of an optical signal obtained by amplitude modulation and frequency modulation of an optical carrier wave, with a 0 bit data value having a 0 bit mean amplitude having a 0 bit amplitude time duration and a 0 bit frequency having a 0 bit frequency duration, and a 1 bit data value having a 1 bit mean amplitude having a 1 bit amplitude time duration and a 1 bit frequency having a 1 bit frequency duration; the improvement wherein: the phase across each 1 bit data value is substantially constant, and the phase of the carrier changes across each and every 0 bit by an amount equal to the product of the frequency difference between the 1 bit and the 0 bit and the duration of the 0 bit; whereby to extend the error-free propagation of the optical signal though a dispersive optical fiber beyond the dispersion limit. In accordance with one form of the present invention, there is provided a method for transmitting binary data contained in respective successive time cells, the data being in the form of an optical signal obtained by amplitude modulation and frequency modulation of an optical carrier wave, with a 0 bit data value having a 0 bit mean amplitude having a 0 bit amplitude time duration and a 0 bit frequency having a 0 bit frequency duration, and a 1 bit data value having a 1 bit mean amplitude having a 1 bit amplitude time duration and a 1 bit frequency having a 1 bit frequency duration; the improvement wherein: the amplitude profile of the 1 bit is substantially bell-shaped, and the frequency profile of the 1 bit is substantially square-shaped, with steeper rise and fall time and a wider flat top region; whereby to extend the error-free propagation of the optical signal though a dispersive optical fiber beyond the dispersion limit.

    Optical system comprising an FM source and a spectral reshaping element
    43.
    发明申请
    Optical system comprising an FM source and a spectral reshaping element 有权

    公开(公告)号：US20060029358A1

    公开(公告)日：2006-02-09

    申请号：US11068032

    申请日：2005-02-28

    申请人： Daniel Mahgerefteh ,  Yasuhiro Matsui ,  Xueyan Zheng ,  Bart Johnson ,  Duncan Walker ,  Parviz Tayebati

    发明人： Daniel Mahgerefteh ,  Yasuhiro Matsui ,  Xueyan Zheng ,  Bart Johnson ,  Duncan Walker ,  Parviz Tayebati

    IPC分类号： H04N11/02

    CPC分类号： H04B10/58 ,  H04B10/25137 ,  H04B10/508

    摘要： In one form of the present invention, there is provided a fiber optic communication system comprising: an optical signal source adapted to receive a base binary signal and produce a first signal, said first signal being frequency modulated; and an optical spectrum reshaper adapted to reshape the first signal into a second signal, said second signal being amplitude modulated and frequency modulated; characterized in that: the frequency characteristics of said first signal, and the optical characteristics of said optical spectrum reshaper, being such that the frequency characteristics of said second signal are configured so as to increase the tolerance of the second signal to dispersion in a transmission fiber. In another form of the present invention, there is provided an optical transmitter comprising: a frequency modulated source for generating a first frequency modulated signal, and an amplitude modulator for receiving the first frequency modulated signal and for generating a second amplitude and frequency modulated signal. In another form of the present invention, there is provided a method for transmitting an optical signal through a transmission fiber comprising: receiving a base binary signal; operating an optical signal source using the base binary signal to produce a first signal, said first signal being frequency modulated; passing the frequency modulated signal through an optical spectrum reshaper so as to reshape the first signal into a second signal, said second signal being amplitude modulated and frequency modulated; the frequency characteristics of said first signal, and the optical characteristics of said optical spectrum reshaper, being such that the frequency characteristics of said second signal are configured so as to increase the tolerance of the second signal to dispersion in a transmission fiber; and passing the second signal through a transmission fiber. In another form of the present invention, there is provided a method for transmitting a base signal, comprising: using the base signal to produce a frequency modulated signal; and providing an amplitude modulator for receiving the frequency modulated signal and for generating an amplitude and frequency modulated signal.

    Carrier suppression using adiabatic frequency modulation (AFM)
    44.
    发明申请
    Carrier suppression using adiabatic frequency modulation (AFM) 有权
    使用绝热频率调制（AFM）的载波抑制

    公开(公告)号：US20060002717A1

    公开(公告)日：2006-01-05

    申请号：US11037893

    申请日：2005-01-18

    申请人： Yasuhiro Matsui ,  Daniel Mahgerefteh

    发明人： Yasuhiro Matsui ,  Daniel Mahgerefteh

    IPC分类号： H04B10/04

    CPC分类号： H04B10/505 ,  H04B10/5165

    摘要： A method for suppression of the optical carrier of an optically modulated digital signal, comprising of the steps of: modulating the amplitude of an optical carrier with digital input data to generate an amplitude modulated optical signal; and modulating the frequency of the optical carrier of the resulting optical signal with the same digital input data. A fiber optic system comprising: an optical source adapted to produce an adiabatically chirped amplitude modulated optical signal; an optical fiber adapted to receive the optical signal; and an optical receiver; wherein the optical power of the signal launched into the fiber exceeds the stimulated Brillouin threshold of the transmission fiber for a single frequency, continuous wave signal. A system for suppression of the optical carrier of an optically modulated digital signal comprising: modulating the amplitude and the frequency of an optical carrier with digital input data to generate an amplitude and frequency modulated optical signal, whereby to limit the stimulated Brillouin scattering loss of a transmission fiber to a selected value.

    摘要翻译： 一种用于抑制光调制数字信号的光载波的方法，包括以下步骤：用数字输入数据调制光载波的振幅，以产生调幅光信号; 并用相同的数字输入数据调制所得光信号的光载波的频率。 一种光纤系统，包括：适于产生绝热啁啾的调幅光信号的光源; 适于接收光信号的光纤; 和光接收机; 其中发射到光纤中的信号的光功率超过单频连续波信号的传输光纤的受激布里渊阈值。 一种用于抑制光学调制数字信号的光载波的系统，包括：用数字输入数据调制光载波的幅度和频率，以产生幅度和频率调制的光信号，从而限制被调制的布里渊散射损耗 传输光纤到选定的值。

    Slow chirp compensation for enhanced signal bandwidth and transmission performances in directly modulated lasers
    46.
    发明授权
    Slow chirp compensation for enhanced signal bandwidth and transmission performances in directly modulated lasers 有权
    缓慢的啁啾补偿，用于增强直接调制激光器的信号带宽和传输性能

    公开(公告)号：US08027593B2

    公开(公告)日：2011-09-27

    申请号：US12028678

    申请日：2008-02-08

    申请人： Jianying Zhou ,  Xueyan Zheng ,  Kevin J. McCallion ,  Daniel Mahgerefteh ,  Hongmin Chen ,  Guoxi Sun ,  Parviz Tayebati

    发明人： Jianying Zhou ,  Xueyan Zheng ,  Kevin J. McCallion ,  Daniel Mahgerefteh ,  Hongmin Chen ,  Guoxi Sun ,  Parviz Tayebati

    IPC分类号： H04B10/12

    CPC分类号： H04B10/504 ,  H04B10/58

    摘要： The frequency chirp modulation response of a directly modulated laser is described using a small signal model that depends on slow chirp amplitude s and slow chirp time constant τs. The small signal model can be used to derive an inverse response for designing slow chirp compensation means. Slow chirp compensation means include electrical compensation, optical compensation, or both. Slow chirp electrical compensation can be implemented with an LR filter or other RF circuit coupled to a direct modulation source (e.g., a laser driver) and the directly modulated laser. Slow chirp optical compensation can be implemented with an optical spectrum reshaper having a rounded top and relatively large slope (e.g., 1.5-3 dB/GHz). The inverse response can be designed to under-compensate, to produce a flat response, or to over-compensate.

    摘要翻译： 使用取决于慢啁啾振幅s和慢啁啾时间常数τs的小信号模型来描述直接调制激光器的频率啁啾调制响应。 小信号模型可用于导出用于设计慢啁啾补偿装置的反向响应。 慢啁啾补偿装置包括电补偿，光学补偿或两者。 可以使用耦合到直接调制源（例如，激光驱动器）和直接调制的激光器的LR滤波器或其它RF电路来实现慢啁啾电补偿。 可以用具有圆顶和较大斜率（例如，1.5-3dB / GHz）的光谱整形器实现慢啁啾光学补偿。 反向响应可以设计为欠补偿，产生平坦响应或过度补偿。

    GAIN-SWITCHED FIBER LASER SYSTEM
    47.
    发明申请
    GAIN-SWITCHED FIBER LASER SYSTEM 有权
    增益光纤激光系统

    公开(公告)号：US20100226395A1

    公开(公告)日：2010-09-09

    申请号：US11493140

    申请日：2006-07-26

    申请人： Min Jiang ,  Daniel Mahgerefteh

    发明人： Min Jiang ,  Daniel Mahgerefteh

    IPC分类号： H01S3/30

    CPC分类号： H01S3/067 ,  G02F1/37 ,  H01S3/0092 ,  H01S3/0675 ,  H01S3/06791 ,  H01S3/094003 ,  H01S3/094076 ,  H01S3/1024

    摘要： This invention discloses a method to control laser dynamics in a gain-switched fiber laser so as to generate stable, clean pulses in an all-fiber format. The gain-switched fiber laser is suitable as a standalone laser source, and as a pump source for harmonic generation and an optical-parametric-oscillator.

    摘要翻译： 本发明公开了一种在增益切换光纤激光器中控制激光动力学的方法，以便产生全光纤格式的稳定，干净的脉冲。 增益开关光纤激光器适合作为独立的激光源，作为谐波发生的泵浦源和光参量振荡器。

    THERMAL CHIRP COMPENSATION IN A CHIRP MANAGED LASER
    50.
    发明申请
    THERMAL CHIRP COMPENSATION IN A CHIRP MANAGED LASER 有权
    CHIRP管理激光器中的热线补偿

    公开(公告)号：US20120251130A1

    公开(公告)日：2012-10-04

    申请号：US13493849

    申请日：2012-06-11

    申请人： Xueyan Zheng ,  Jianying Zhou ,  Vincent Bu ,  Daniel Mahgerefteh

    发明人： Xueyan Zheng ,  Jianying Zhou ,  Vincent Bu ,  Daniel Mahgerefteh

    IPC分类号： H04B10/04

    CPC分类号： H01S5/0427 ,  H01S5/02284 ,  H01S5/06837 ,  H01S5/0687

    摘要： Thermal chirp compensation in a chirp managed laser. In one example embodiment, a laser package including a laser and an optical spectrum reshaper configured to convert frequency modulated optical signals from the laser into an amplitude modulated optical signals is provided. A thermal chirp compensation device is in communication with the laser package and a laser driver. The thermal chirp compensation device includes means for generating bias condition and temperature specific thermal chirp compensation signals that each corresponds to a predetermined level of thermal chirp that is induced in the laser by operating the laser at a particular bias condition and temperature.

    摘要翻译： 啁啾管理激光器中的热啁啾补偿。 在一个示例性实施例中，提供了包括激光器和被配置成将来自激光器的调频光信号转换成幅度调制光信号的光谱整形器的激光器封装。 热啁啾补偿装置与激光器封装和激光驱动器通信。 热啁啾补偿装置包括用于产生偏置条件和温度特定热啁啾补偿信号的装置，每个对应于通过在特定偏压条件和温度下操作激光而在激光器中感应的预定水平的热啁啾。