为了准确描述压电陶瓷执行器中存在的速率依赖性迟滞,给出了一种由迟滞环节和动态环节构成的串联块模型。迟滞环节的数学模型通过引入描述梯度变化的迟滞算子,将多值映射转化为扩展输入空间上的一一映射,使用前向神经网络来逼近。基于...为了准确描述压电陶瓷执行器中存在的速率依赖性迟滞,给出了一种由迟滞环节和动态环节构成的串联块模型。迟滞环节的数学模型通过引入描述梯度变化的迟滞算子,将多值映射转化为扩展输入空间上的一一映射,使用前向神经网络来逼近。基于迟滞模型,引入线性动态模型描述压电陶瓷迟滞输出的速率依赖性,构造神经网络NARX(nonlinear autoregressive model with exogenous inputs)模型。进一步,给出了模型参数优化的递推随机牛顿算法。实验结果验证了所提出的模型和估计算法的有效性。展开更多
An all-optical return-to-zero differential quadrature phase-shift keying (RZ-DQPSK) signal regeneration scheme is experimentally demonstrated.Thanks to the gain saturation effect,common quantum-well semiconductor opti...An all-optical return-to-zero differential quadrature phase-shift keying (RZ-DQPSK) signal regeneration scheme is experimentally demonstrated.Thanks to the gain saturation effect,common quantum-well semiconductor optical amplifiers have the ability to regenerate the amplitude distorted RZ-DQPSK signal,so amplitude noise can be reduced while phase information will not be distorted.A significant eye-opening improvement and a negative power penalty of about 1 dB can be achieved for an 80 Gb/s RZ-DQPSK signal.展开更多
We experimentally demonstrate that,based on operational condition optimization,a common quantum well (QW) semiconductor optical amplifier (SOA) has the ability of amplitude regeneration for return-to-zero (RZ) differe...We experimentally demonstrate that,based on operational condition optimization,a common quantum well (QW) semiconductor optical amplifier (SOA) has the ability of amplitude regeneration for return-to-zero (RZ) differential phase shift keying (DPSK) signals.For a single-channel RZ-DPSK regeneration scheme,a significant eye-opening enhancement and a negative power penalty of about 1.0 dB are obtained.For dual-channel RZ-DPSK regeneration,it can also be found that the eye-opening improvement and power penalty decrease in each channel.In addition,the DPSK regeneration scheme based on a single QW SOA is quite simple and stable.展开更多
All-optical format conversion from return-to-zero differential phase shift keying(RZ-DPSK)to non-return-to-zero DPSK(NRZ-DPSK)is demonstrated by using a delay interferometer and a 1-nm-bandwidth filter at 40 Gbit/s.Th...All-optical format conversion from return-to-zero differential phase shift keying(RZ-DPSK)to non-return-to-zero DPSK(NRZ-DPSK)is demonstrated by using a delay interferometer and a 1-nm-bandwidth filter at 40 Gbit/s.The operation principle is theoretically analyzed and numerically simulated with the help of VPI Transmission Maker 8.5.The simulated results are in agreement well with the experimental results.The conversion can be achieved with power penalty of 0.7dB.展开更多
文摘为了准确描述压电陶瓷执行器中存在的速率依赖性迟滞,给出了一种由迟滞环节和动态环节构成的串联块模型。迟滞环节的数学模型通过引入描述梯度变化的迟滞算子,将多值映射转化为扩展输入空间上的一一映射,使用前向神经网络来逼近。基于迟滞模型,引入线性动态模型描述压电陶瓷迟滞输出的速率依赖性,构造神经网络NARX(nonlinear autoregressive model with exogenous inputs)模型。进一步,给出了模型参数优化的递推随机牛顿算法。实验结果验证了所提出的模型和估计算法的有效性。
基金Supported by the National Basic Research Program of China under Grant No 2011CB301704the National Natural Science Foundation of China under Grant No 61007042+2 种基金the State Key Laboratory of Advanced Optical Communication Systems and Networks under Grant No 2008SH10the Doctoral Program Foundation of Institutions of Higher Education of China under Grant No 20090142110052the Fundamental Research Funds for the Central Universities under Grant No HUST 2010QN041.
文摘An all-optical return-to-zero differential quadrature phase-shift keying (RZ-DQPSK) signal regeneration scheme is experimentally demonstrated.Thanks to the gain saturation effect,common quantum-well semiconductor optical amplifiers have the ability to regenerate the amplitude distorted RZ-DQPSK signal,so amplitude noise can be reduced while phase information will not be distorted.A significant eye-opening improvement and a negative power penalty of about 1 dB can be achieved for an 80 Gb/s RZ-DQPSK signal.
基金Supported in part by the National Natural Science Foundation of China under Grant No 61007042the Doctoral Program Foundation of Institutions of Higher Education of China(20090142110052)the National Basic Research Program of China under Grant No 2011CB301704.
文摘We experimentally demonstrate that,based on operational condition optimization,a common quantum well (QW) semiconductor optical amplifier (SOA) has the ability of amplitude regeneration for return-to-zero (RZ) differential phase shift keying (DPSK) signals.For a single-channel RZ-DPSK regeneration scheme,a significant eye-opening enhancement and a negative power penalty of about 1.0 dB are obtained.For dual-channel RZ-DPSK regeneration,it can also be found that the eye-opening improvement and power penalty decrease in each channel.In addition,the DPSK regeneration scheme based on a single QW SOA is quite simple and stable.
基金Supported by the National Natural Science Foundation of China under Grant No 61007042the National Basic Research Program of China under Grant No 2011CB301704the State Key Laboratory of Advanced Optical Communication Systems and Networks under Grant No 2008SH10.
文摘All-optical format conversion from return-to-zero differential phase shift keying(RZ-DPSK)to non-return-to-zero DPSK(NRZ-DPSK)is demonstrated by using a delay interferometer and a 1-nm-bandwidth filter at 40 Gbit/s.The operation principle is theoretically analyzed and numerically simulated with the help of VPI Transmission Maker 8.5.The simulated results are in agreement well with the experimental results.The conversion can be achieved with power penalty of 0.7dB.
