Photonic arbitrary waveform generator based on Taylor synthesis method.

Area of Science:

• Photonics and Optical Engineering
• Integrated Optics
• Waveform Generation

Background:

• Arbitrary waveform generation is crucial for optical communication and radar systems.
• Existing methods often rely on Fourier synthesis or frequency-to-time mapping, requiring large or difficult-to-fabricate components.
• On-chip integration of such generators remains a challenge.

Purpose of the Study:

• To propose and experimentally demonstrate a novel silicon-on-insulator (SOI) optical arbitrary waveform generator.
• To utilize the Taylor synthesis method for on-chip waveform generation.
• To overcome limitations of existing methods by avoiding spectral dispersers and large dispersion.

Main Methods:

• The proposed scheme employs a silicon-on-insulator platform.
• Cascaded microrings are used to generate first-, second-, and third-order differentiations of an input Gaussian pulse.
• Control over the amplitude and phase of the initial pulse and its differentiations enables waveform synthesis via Taylor expansion.

Main Results:

• The experimental demonstration successfully generated various waveforms, including square, triangular, flat-top, sawtooth, and Gaussian waveforms.
• The device is based on Taylor synthesis, distinguishing it from Fourier synthesis or frequency-to-time mapping approaches.
• The fabricated device is compact and suitable for integration with electronic components.

Conclusions:

• The demonstrated SOI optical arbitrary waveform generator based on Taylor synthesis is a compact and efficient solution.
• The method avoids the need for challenging-to-fabricate spectral dispersers or large dispersion elements.
• This technology holds promise for advanced optical communication, radar systems, and other integrated photonic applications.