基于光时分复用的电光模数转换

In this paper, An optoelectronic analog-to-digital conversion (ADC) approach based on optical time division multiplexing (OTDM) is proposed. Time division multiplexing of optical signal is realized by employing only one continuous wave laser and an electrooptic modulator combined with fiber delay lines (FDL), and analog-to-digital conversion is completed through electronic ADCs. The system structure is simple and has good scalability. Ratio of signal to noise and distortion (SINAD) as high as 28.5 dB, which is equivalent to 4.44 effective number of bits (ENOB), is obtained in two-channel OTDM ADC experiments. Main causes of quantization error are analyzed and methods to improve precision are discussed.