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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