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通道内幅度噪声和通道间幅度不匹配是限制时间波长交织光模数转换系统(TWIPADC)性能的主要因素。提出了一种基于自适应干扰对消的TWIPADC幅度校正方法。该方法采用自适应干扰对消原理实时消除光源抖动和光时分复用模块引入的通道内幅度噪声,同时采用基于标定的方案对波分复用(WDM)模块等引入的通道间幅度不匹配进行校正。给出了基于所提幅度校正方案的TWIPADC系统结构,通过建立相应的数学模型,理论分析了所提幅度校正方案的原理和流程。仿真结果表明:基于自适应对消理论,可以有效实时消除TWIPADC中光源以及OTDM模块引入的幅度噪声;所提幅度校正方案可以将16通道、32GS/s TWIPADC系统的信纳比提升30dB以上。
In-channel amplitude noise and inter-channel amplitude mismatch are the main factors limiting the performance of TWIPADC. A TWIPADC amplitude correction method based on adaptive interference cancellation is proposed. The method uses adaptive interference cancellation principle to eliminate in-channel amplitude noise induced by light source jitter and optical time-division multiplexing module in real time, and uses the calibration-based scheme to correct the amplitude mismatch between channels introduced by the WDM module . The structure of TWIPADC system based on the proposed amplitude correction scheme is given. By establishing the corresponding mathematical model, the principle and flow of the proposed amplitude correction scheme are theoretically analyzed. The simulation results show that based on the adaptive cancellation theory, the amplitude noise introduced by the TWIPADC light source and the OTDM module can be effectively eliminated in real time. The proposed amplitude correction scheme can improve the SINR of the 16-channel and 32GS / s TWIPADC system by more than 30dB.