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40GS/s Optical analog-to-digital conversion system and its improvement
Qingwei Wu1, Hongming Zhang, Yue Peng
1State Key Laboratory on Intergrated Optoelectronics, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China. wqw04@mails.tsinghua.edu.cn
Optics Express
|May 26, 2009
Summary
This study demonstrates an optical analog-to-digital conversion system achieving a 40GS/s sampling rate. Novel technology enhances bandwidth to over 50 GHz for high-speed signal processing.
Area of Science:
- Photonics
- Electrical Engineering
- Signal Processing
Background:
- Traditional analog-to-digital converters (ADCs) face limitations in achieving high sampling rates and bandwidth.
- Optical sampling offers a promising approach to overcome these electronic bottlenecks.
Purpose of the Study:
- To propose and demonstrate a novel optical analog-to-digital conversion (OADC) system.
- To achieve high sampling rates and bandwidth for advanced signal processing applications.
Main Methods:
- Utilizing a time- and wavelength- interleaved optical sampling pulse train for high-speed sampling.
- Employing a commercially available Lithium Niobate (LiNbO3) phase modulator for enhanced system bandwidth.
Main Results:
- Demonstrated an OADC system with a sampling rate of 40 Giga samples per second (GS/s).
- Successfully sampled and quantized a 2.5 GHz sinusoidal electrical analog signal.
- Achieved an effective number of bits (ENOB) of 3.45 bits.
- Showcased a novel technology enabling system bandwidth exceeding 50 GHz.
Conclusions:
- The proposed OADC system effectively achieves high sampling rates.
- The novel bandwidth enhancement technology significantly expands the system's capabilities.
- This OADC system holds potential for high-frequency signal acquisition and processing.
