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2. ENGINEERING AND TECHNOLOGY
In this paper, a cascade optical quantization scheme is proposed to realize all-optical analog-to-digital converter with efficiently enhanced quantization resolution and achievable high analog bandwidth of larger than 20 GHz. Employing the cascade structure of an unbalanced Mach-zehnder modulator and a specially designed optical directional coupler, we predict the enhancement of number-of-bits can be up to 1.59-bit. Simulation results show that a 25 GHz RF signal is efficiently digitalized with the signal-tonoise ratio of 33.58 dB and effective-number-of-bits of 5.28-bit.
Kang, Z. et al. (2014) Resolution-Enhanced All-Optical Analog-to-Digital Converter Employing Cascade Optical Quantization Operation. Optics Express, Vol. 22, Issue 18, pp. 21441-21453. doi:10.1364/OE.22.021441
This work was supported in part by the National Basic Research Program under Grants 2010CB327605, the National Natural Science Foundation of China under Grant 61307109, the National High-Technology Research and Development Program of China under Grant 2013AA031501, the Specialized Research Fund for the Doctoral Program of Higher Education under Grant 20120005120021, the Fundamental Research Funds for the Central Universities under Grant 2013RC1202, the Program for New Century Excellent Talents in University under Grant NECT-11-0596, the Beijing Nova Program under Grant 2011066, the Hong Kong Scholars Program 2013, the Research Grant Council of the Hong Kong Special Administrative Region China under Grant PolyU5272/12E, and the Science Foundation Ireland (SFI) under Grants SFI/12/ISCA/2496 and SFI/13/ISCA/2845.