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Resolution-enhanced all-optical analog-to-digital converter employing cascade optical quantization operation
Optics Express
|October 17, 2014
Summary
This study introduces a new optical quantization scheme for all-optical analog-to-digital converters. The proposed method enhances resolution and achieves high bandwidth, improving digital signal conversion.
Area of Science:
- Photonics
- Optical Engineering
- Signal Processing
Background:
- All-optical analog-to-digital converters (ADCs) are crucial for high-speed signal processing.
- Enhancing quantization resolution and analog bandwidth in optical ADCs remains a significant challenge.
Purpose of the Study:
- To propose and analyze a novel cascade optical quantization scheme.
- To achieve enhanced quantization resolution and high analog bandwidth for all-optical ADCs.
Main Methods:
- A cascade structure utilizing an unbalanced Mach-Zehnder modulator and a specialized optical directional coupler was employed.
- Simulations were conducted to evaluate the performance of the proposed scheme.
Main Results:
- The proposed scheme predicts an enhancement of up to 1.59-bit in quantization resolution.
- A 25 GHz radio frequency (RF) signal was successfully digitalized.
- The digitalized signal achieved a signal-to-noise ratio (SNR) of 33.58 dB and an effective number of bits (ENOB) of 5.28-bit.
Conclusions:
- The cascade optical quantization scheme effectively enhances quantization resolution and analog bandwidth.
- The proposed all-optical ADC demonstrates high performance for high-frequency RF signal digitalization.
