Abstract
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.
Highlights
In recent years, optical frequency combs (OFC) have become an increasing popular research area [1,2,3]
The frequency space between comb lines is governed by the device length due to fundamental operation principles and limit their abilities and flexibility to be integrated onto photonic circuits
A model based on Coupled mode theory (CMT) is built upon to simulate the modulation of a carrier light through a photonic crystal (PhC)
Summary
Optical frequency combs (OFC) have become an increasing popular research area [1,2,3]. There are many schemes for generating an OFC, which include mode locked lasers [5], electro-optic (EO) modulators [6], and micro toroidal cavities [7]. The frequency space between comb lines is governed by the device length due to fundamental operation principles and limit their abilities and flexibility to be integrated onto photonic circuits. Another well-established area of OFC generation is in micro-toroidal cavities [8]
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