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    • 33. 发明授权
    • Lightwave communication systems using semiconductor optical amplifiers
    • 使用半导体光放大器的光波通信系统
    • US06473212B1
    • 2002-10-29
    • US09253259
    • 1999-02-19
    • Andrew Roman ChraplyvyRobert Meachem JopsonAtul Kumar SrivastavaJames William SulhoffYan Sun
    • Andrew Roman ChraplyvyRobert Meachem JopsonAtul Kumar SrivastavaJames William SulhoffYan Sun
    • H04J1402
    • H04B10/296H04B10/2914
    • Substantially error-free communications is achieved in an optical communication system that includes optical amplifiers by detecting bits transmitted in the amplified optical signal using a detection threshold that is derived as a function of a maximum power level associated with a first bit value, e.g., bit “0”, and a minimum power level associated with a second bit value, e.g., bit “1”. Importantly, this detection scheme can be used to accurately detect bit patterns in the amplified signal even in the presence of nonlinear distortions caused by gain variations, such as inter-modal distortion and saturation induced crosstalk. In a wavelength division multiplexed (WDM) system comprising semiconductor optical amplifiers, for example, the detection threshold can be set at a level corresponding to PTOTAL/2N, where PTOTAL represents the total power in the WDM signal and N represents the number of optical channels in the WDM signal. According to another aspect of the invention, the effect of gain fluctuations becomes smaller as the number of channels increase. In particular, a smoothing effect is realized for the total effective saturation power as gain variations decrease as a function of an increase in the number of channels. As such, the performance of a semiconductor optical amplifier according to the principles of the invention approaches the linear performance of fiber amplifiers as the number of channels increases.
    • 在包括光放大器的光通信系统中实现基本无差错的通信,所述光通信系统使用检测阈值来检测放大的光信号中发送的位,所述检测阈值作为与第一位值相关联的最大功率电平的函数导出,例如位 “0”,以及与第二位值相关联的最小功率电平,例如位“1”。 重要的是,即使存在由诸如模态间失真和饱和感应串扰的增益变化引起的非线性失真,该检测方案也可用于精确地检测放大信号中的位模式。 在包括半导体光放大器的波分复用(WDM)系统中,例如,检测阈值可以被设置在与PTOTAL / 2N相对应的电平,其中PTOTAL表示WDM信号中的总功率,N表示光信道数 在WDM信号中。 根据本发明的另一方面,增益波动的效果随着信道数量的增加而变小。 特别地,当增益变化随着通道数量的增加而减小时,实现总有效饱和功率的平滑效果。 因此,根据本发明原理的半导体光放大器的性能随着信道数量的增加而接近光纤放大器的线性性能。
    • 34. 发明授权
    • Optical amplifier system with transient control using spectrally filtered input
    • 具有使用频谱滤波输入的瞬态控制的光放大器系统
    • US06341034B1
    • 2002-01-22
    • US09711924
    • 2000-11-15
    • Yan SunJun Ye
    • Yan SunJun Ye
    • H04B1012
    • H04B10/296
    • Optical amplifiers are provided for use in fiber-optic communications networks. An optical amplifier may be controlled to prevent gain transients. The optical amplifier may use a spectrally-filtered input power tap to monitor input power. Amplifier gain may be controlled based on the monitored spectrally-filtered input power. Gain may be provided using one or more rare-earth-doped fiber coils such as erbium-doped fiber coils. The coils may be pumped by laser diodes or other suitable pumps. The optical output power of the pumps may be controlled by a control unit. The control unit may calculate the appropriate pump power for the pumps to supply to the fiber coils based on the measured spectrally-filtered input power of the amplifier. The output power of the amplifier may also be measured. A combination of feed-forward and feedback techniques may be used to calculate the pump power to be supplied by the pumps.
    • 提供光放大器用于光纤通信网络。 可以控制光放大器以防止增益瞬变。 光放大器可以使用频谱滤波的输入功率抽头来监测输入功率。 放大器增益可以基于监控的频谱滤波输入功率进行控制。 可以使用一个或多个稀土掺杂的光纤线圈(例如掺铒光纤线圈)来提供增益。 线圈可以由激光二极管或其它合适的泵泵送。 泵的光输出功率可以由控制单元控制。 控制单元可以基于所测量的放大器的频谱滤波输入功率来计算供应给光纤线圈的泵的适当泵功率。 也可以测量放大器的输出功率。 可以使用前馈和反馈技术的组合来计算由泵供应的泵功率。