基于移相光量化的任意波形全光模数转换  

Arbitrary Waveform All-Optical Analog-to-Digital Conversion Based on Phase-Shifted Optical Quantization

作　　者：王杨[1] 张洪明[1] 马超[1] 姚敏玉[1] 

机构地区：[1]清华大学电子工程系,清华大学信息科学与技术国家实验室,集成光电子学国家重点实验室,北京100084

出　　处：《中国激光》2012年第9期168-171,共4页Chinese Journal of Lasers

基　　金：国家自然科学基金(60977003,61032005)资助课题

摘　　要：全光模数转换器(ADC)在高速信号处理领域有重要应用。研究了基于偏振光干涉的移相光量化(PSOQ)全光模数转换器的频率响应特性。实验中将不同频率的正弦信号经过4bit移相光量化全光模数转换器量化编码后,得到对应的数字信号。通过离散傅里叶变换,获得各个频率点的频谱。对频谱进行分析,得到不同频率下全光模数转换器的响应范围为74.07dB～74.22dB,响应起伏小于0.15dB。在此基础上,对频率为1GHz的三角波信号进行全光量化,并得到3.31bit的有效量化精度。结果表明,移相光量化方案的频率响应特性较好,验证了该方案应用于任意波形全光量化的可行性。All optical analog-to-digital converters （ADC） are key devices in high speed signal processing. The frequency response characteristic of all optical ADC based on polarization-differential interference and phase-shifted optical quantization （PSOQ） is experimentally demonstrated. Different frequency sinusoidal signals are quantized by a 4 bit photonic ADC. The frequency spectra of digital signals are obtained and analyzed by discrete Fourier transform. The results show that the rang of frequency response is from 74.07 dB to 74.22 dB. The fluctuation of the frequency response is less than 0. 15 dB. Then a 1 GHz triangular waveform is sampled and all-optical quantized, and the effective number of bits （ENOB） of 3.31 bit is obtained. The experimental results show that the frequency response of the PSOQ is better, and the application of PSOQ in arbitrary waveform is feasible.

关 键 词：信号处理 全光模数转换 偏振干涉 移相 

分 类 号：TN29[电子电信—物理电子学]