Integrated All-Optical Fast Fourier Transform: Design and Sensitivity Analysis

TL;DR

This paper presents a novel integrated all-optical FFT design in Silicon photonics, analyzing its performance and sensitivity to phase and amplitude variations, aiming to improve speed and compactness over traditional digital and fiber optic FFTs.

Contribution

The paper introduces a new integrated optical FFT design in Silicon photonics and evaluates its performance and sensitivity to operational variations.

Findings

Performance depends on phase and amplitude stability.

Device variations impact transfer function quality.

Design offers potential for high-bandwidth, compact optical FFTs.

Abstract

The fast Fourier transform, FFT, is a useful and prevalent algorithm in signal processing. It characterizes the spectral components of a signal, or is used in combination with other operations to perform more complex computations such as filtering, convolution, and correlation. Digital FFTs are limited in speed by the necessity of moving charge within logic gates. An analog temporal FFT in fiber optics has been demonstrated with highest data bandwidth. However, the implementation with discrete fiber optic FFT components is bulky. Here, we present and analyze a design of an optical FFT in Silicon photonics and evaluate its performance with respect to variations in phase and amplitude. We discuss the impact of the deployed devices on the FFTs transfer function quality as defined by the transmission output power as a function of frequency, detuning phase, optical delay, and loss.