Abstract
A novel approach for all-optical digital-to-analog conversion (DAC) based on the pulse walk-off effect is proposed and experimentally demonstrated. In this approach, an ultrafast optical pulse train is firstly spectrum-tailored by a spectrum-shaper to achieve the multi-wavelength pulses, serving as the sampling source for carrying serial input digital signals via intensity modulation. These modulated optical signals are then injected into a dispersion medium to introduce multi-wave pulse walk-off. Consequently, the modulated optical signals partially overlap in the time domain and the incoherent weighted intensity summation can be realized. The following intensity modulator driven by the selecting codes extracts the target signals in the right time slots. The proposed approach features all-optical structure, inter-channel error avoidance, and high conversion rate, offering a promising solution for achieving high-performance photonic DAC. A proof-of-concept experiment of a 3-bit DAC system with a conversion rate of 5 Gbps based on the pulse walk-off effect has been successfully carried out. Additionally, the system’s performance in terms of Effective number of bits (ENOB) versus modulator extinction ratio and dispersion fluctuations is also discussed in detail.
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