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Open AccessArticle

Photonic Crystal Cavity-Based Intensity Modulation for Integrated Optical Frequency Comb Generation

1
Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S3 7HQ, UK
2
Department of Electronic Engineering, Xiamen University, Fujian 361005, China
3
College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310007, China
*
Authors to whom correspondence should be addressed.
Crystals 2019, 9(10), 493; https://doi.org/10.3390/cryst9100493
Received: 30 August 2019 / Revised: 20 September 2019 / Accepted: 23 September 2019 / Published: 25 September 2019
(This article belongs to the Special Issue Sonic and Photonic Crystals)
A simple scheme to generate an integrated, nanoscale optical frequency comb (OFC) is numerically studied. In this study, all optical intensity modulators based on photonic crystal (PhC) cavities are cascaded both in series and parallel. By adjusting the modulation parameters, such as the repetition rate, phase, and coupling efficiency of the modulating wave, it is possible to produce combs with a variety of different characteristics. Unique to PhC intensity modulators, in comparison with standard lithium niobate modulators, is the ability to control the amplitude of the light via a cavity rather than controlling the phase through one arm of a Mach–Zehnder interferometer. This opens up modulation-based OFC generation to new possibilities in both nanoscale operation and cavity-based schemes. View Full-Text
Keywords: photonic crystals; microwave photonics; optical frequency combs photonic crystals; microwave photonics; optical frequency combs
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Francis, H.; Chen, S.; Che, K.-J.; Hopkinson, M.; Jin, C. Photonic Crystal Cavity-Based Intensity Modulation for Integrated Optical Frequency Comb Generation. Crystals 2019, 9, 493.

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