Abstract
Self- and cross-phase modulation (SPM, XPM) in fiber is expected to play a major role in ultrafast all-optical analog-to-digital conversion(ADC), which can overcome the obstacles of inherently limited operating speed of electronic ADC. In this paper, we propose novel optical coding method for all-optical ADC using nonlinear optical switches based on the Sagnac interferometer. The multiperiod transfer function, which is the key to coding, is achieved through an exact design of the Sagnac interferometer. We conducted proof-of-principle experiments and successfully demonstrated 2.6-bit all optical ADC with Gray code output. The proposed optical coding, combined with existing optical sampling and quantizing techniques, will enable ultrafast photonic ADC without electronics.
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