Abstract
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-to-noise ratio of 33.58 dB and effective-number-of-bits of 5.28-bit.
Highlights
The high performance analog-to-digital converters (ADCs) have been widely applied in the high speed optical communication, advanced radar system, and real-time signal monitoring
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
Summary
The high performance analog-to-digital converters (ADCs) have been widely applied in the high speed optical communication, advanced radar system, and real-time signal monitoring. Extensive optical quantization schemes have been proposed and improved aiming to achieve high quantization resolution, e.g. the phase quantization by the modulation and interference [7,8,9,10,11,12,13,14,15] and the frequency quantization by the nonlinear effects in highly nonlinear fibers [16,17,18,19,20,21] In these schemes, the cascade quantization methods demonstrated in [12] and [13] have great advantages compared to the other schemes because the enhancement of more than 1-bit in the quantization resolution can be obtained on the basis of the conventional phase quantization schemes. Simulations show that a 25 GHz sinusoidal analog signal can be efficiently digitized using the proposed scheme
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