基于色散补偿光子晶体光纤的双通道光子时间拉伸模数转换器系统研究

Dual-Channel Photonic Time-Stretched Analog-to-Digital Converter System Based on Dispersion Compensating Photonic Crystal Fiber

研究了色散补偿光子晶体光纤(DC-PCF)对双通道光子时间拉伸模数转换器(PTS-ADC)的性能影响。通过理论推导验证了DC-PCF抑制PTS-ADC中三阶谐波产生的原理。设计了一种基于DC-PCF的双通道PTS-ADC系统,利用Optisystem软件对该系统进行仿真研究,分别对5组不同的输入射频(RF)信号(16.25,20.25,24.25,28.25,32.25GHz)进行模数转换,对比DC-PCF和色散补偿光纤(DCF)作为色散介质时系统的有效量化位数等性能参数。仿真结果表明,DC-PCF能够有效抑制三阶谐波的产生,提高双通道PTS-ADC的量化精度。

The effect of dispersion compensating photonic crystal fiber （DC-PCF） on dual-channel photonic time- stretched analog-to-digital converter （PTS-ADC） is studied. The principle that DC-PCF can suppress third-order harmonic in PTS-ADC is theoretically verified. The dual-channel PTS ADC based on DC-PCF is designed and simulated with the Optisystem software. The effective number of bits （ENOB） of PTS-ADC is simulated and compared between DC-PCF and dispersion compensation fiber （DCF） as dispersive mediums under the condition of five different input radio frequencies （RF） signals （16.25, 20.25, 24.25, 28.25, 32.25 GHz）. The simulation results show that DC-PCF can effectively suppress the generation of third-order harmonics and improve the quantization resolution of dual channel PTS-ADC system.