光纤电流互感器(FOCT)易受到各类噪声的影响而导致其测量准确度下降,尤其是在一次电流较小时,因此提高其信噪比是FOCT的关键技术之一。通过全面分析FOCT的光信号噪声、信号检测噪声及外界环境引入的噪声源,给出了FOCT信噪比的计算方法,...光纤电流互感器(FOCT)易受到各类噪声的影响而导致其测量准确度下降,尤其是在一次电流较小时,因此提高其信噪比是FOCT的关键技术之一。通过全面分析FOCT的光信号噪声、信号检测噪声及外界环境引入的噪声源,给出了FOCT信噪比的计算方法,仿真了不同噪声对信噪比的影响,并在此基础上研制了样机。结果表明:通过提高探测器接收光功率、增加传感头敏感光纤圈数以及选择合适的闭环反馈相位调制偏置工作点等方法,可有效提高信噪比;以此为基础设计的FOCT样机,在额定电流为600 A时,可满足0.2S级要求,1%额定电流下信噪比高达30.2 d B,比差<0.61%,相差<12.39′。提出的信噪比优化设计方法,具有较大的实用价值,对FOCT的设计具有指导意义。展开更多
A semiconductor optical amplifier gate based on tensile strained quasi bulk InGaAs is developed.At injection current of 80mA,a 3dB optical bandwidth of more than 85nm is achieved due to dominant band filling effect...A semiconductor optical amplifier gate based on tensile strained quasi bulk InGaAs is developed.At injection current of 80mA,a 3dB optical bandwidth of more than 85nm is achieved due to dominant band filling effect.Moreover,the most important is that very low polarization dependence of gain (<0 7dB),fiber to fiber lossless operation current (70～90mA) and a high extinction ratio (>50dB) are simultaneously obtained over this wide 3dB optical bandwidth (1520～1609nm) which nearly covers the spectral region of the whole C band (1525～1565nm) and the whole L band (1570～1610nm).The gating time is also improved by decreasing carrier lifetime.The wide band polarization insensitive SOA gate is promising for use in future dense wavelength division multiplexing (DWDM) communication systems.展开更多
文摘光纤电流互感器(FOCT)易受到各类噪声的影响而导致其测量准确度下降,尤其是在一次电流较小时,因此提高其信噪比是FOCT的关键技术之一。通过全面分析FOCT的光信号噪声、信号检测噪声及外界环境引入的噪声源,给出了FOCT信噪比的计算方法,仿真了不同噪声对信噪比的影响,并在此基础上研制了样机。结果表明:通过提高探测器接收光功率、增加传感头敏感光纤圈数以及选择合适的闭环反馈相位调制偏置工作点等方法,可有效提高信噪比;以此为基础设计的FOCT样机,在额定电流为600 A时,可满足0.2S级要求,1%额定电流下信噪比高达30.2 d B,比差<0.61%,相差<12.39′。提出的信噪比优化设计方法,具有较大的实用价值,对FOCT的设计具有指导意义。
文摘A semiconductor optical amplifier gate based on tensile strained quasi bulk InGaAs is developed.At injection current of 80mA,a 3dB optical bandwidth of more than 85nm is achieved due to dominant band filling effect.Moreover,the most important is that very low polarization dependence of gain (<0 7dB),fiber to fiber lossless operation current (70～90mA) and a high extinction ratio (>50dB) are simultaneously obtained over this wide 3dB optical bandwidth (1520～1609nm) which nearly covers the spectral region of the whole C band (1525～1565nm) and the whole L band (1570～1610nm).The gating time is also improved by decreasing carrier lifetime.The wide band polarization insensitive SOA gate is promising for use in future dense wavelength division multiplexing (DWDM) communication systems.
