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An improvement of a photonic analog-to-digital converter based on phase-shifted optical quantization (PSOQ) is presented and verified. The resolution can be increased by employing an additional Mach–Zehnder modulator (MZM) to combine with the PSOQ scheme. The improved scheme with a quantization level of 32 (corresponding quantization bit number is 5 bits) is experimentally demonstrated by using two...
In this paper, a novel photonic analog-to-digital conversion method is proposed, theoretically analyzed and numerically simulated. This method features simple configuration, because only one polarization modulator, several polarization controllers and several polarizers are required. Furthermore, this method mitigated the problem of bias-drift, which is common in some previous intensity modulating...
A novel phase-shifted optical analog-to-digital conversion proposal is presented and analyzed. Using an unbalanced MZM and specifically designed filter array, the desired phase shift between adjacent quantization channels can be realized. Comparing with existing schemes, the main advantage of this scheme is only one EOM and two wavelengths needed, regardless of the quantization resolution. Utilizing...
This paper firstly briefly introduces and reviews the recent developments in phase-shifting optical quantization for high-speed microwave signals, which is one promising branch in all-optical analog-to-digital conversion. After that, a phase-shifting optical quantization system with a sampling rate of 40 GS/s and a theoretical read-out-bits of 4-bit is built, and practical considerations for further...
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