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Related Experiment Video

Updated: Jun 19, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Published on: March 20, 2017

Optical folding-flash analog-to-digital converter with analog encoding.

B Jalali, Y M Xie

|October 29, 2009

Summary

Researchers developed an optically assisted analog-to-digital converter using Mach-Zehnder interferometers for efficient signal processing. A new gray code encoding scheme overcomes limitations of previous designs, enabling practical applications.

Area of Science:

Photonics and Optoelectronics
Electrical Engineering
Signal Processing

Background:

Analog-to-digital converters (ADCs) are crucial for interfacing analog signals with digital systems.
Traditional flash ADCs face limitations in speed and power consumption.
Optically assisted techniques offer potential for high-speed signal conversion.

Purpose of the Study:

To introduce a novel optically assisted folding-flash analog-to-digital converter architecture.
To propose an efficient analog encoding scheme for generating gray code digital data.
To overcome the stringent requirement of ultralow V(pi) in Mach-Zehnder interferometers for ADC applications.

Main Methods:

Utilizing the periodic transfer function of a Mach-Zehnder interferometer for analog signal folding.

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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Video-rate Scanning Confocal Microscopy and Microendoscopy

Video-rate Scanning Confocal Microscopy and Microendoscopy

Published on: October 20, 2011

Implementing a new analog encoding scheme for gray code generation.

Experimentally demonstrating the encoding concept using Lithium Niobate (LiNbO3) modulators.

Main Results:

Successful demonstration of analog folding using optical interferometry.
Generation of gray code digital data with an efficient novel encoding scheme.
Elimination of the need for ultralow V(pi) Mach-Zehnder interferometers, simplifying system design.

Conclusions:

The proposed optically assisted folding-flash ADC architecture is feasible and offers advantages over conventional designs.
The novel analog encoding scheme significantly advances the practicality of optical ADCs.
This work paves the way for high-performance, integrated optical analog-to-digital conversion systems.