Highly dispersive micro-ring resonator based on one dimensional photonic crystal waveguide design and analysis

Damian Goldring,Uriel Levy,David Mendlovic

doi:10.1364/oe.15.003156

Damian Goldring, Uriel Levy + Show 1 more

Open Access

https://doi.org/10.1364/oe.15.003156

Copy DOI

Abstract

We propose and analyze a novel design of a hybrid micro-ring resonator and photonic crystal device. The proposed device is based on a micro-ring resonator with the addition of a series of periodic defects that are introduced to the microring. When the wavelength of operation approaches the band-gap of the periodic structure, the modal dispersion is significantly increased. The huge dispersion leads to narrowing of the spectral linewidth of the resonator. We predict an order of magnitude linewidth narrowing for a microring radius of the order of 10mum. The proposed hybrid device is analyzed theoretically and numerically using finite-elements calculations and finite-difference-time-domain calculations. We also present as well as the design and analysis of add-drop and notch filters based on the highly dispersive ring resonator.

Highlights

Photonic Integrated Circuits (P-ICs) have been subject to extensive research over the last decades
In this paper we proposed and analyzed a new device based on a standard micro-ring resonator that is modified by inserting periodic defects into the waveguide of the micro-ring
We exploit the slow light phenomenon that occurs around the band-edge of Photonic Crystals (PhCs) to increase the Q-factor of the resonator and to reduce its FSR

Summary

Introduction

Photonic Integrated Circuits (P-ICs) have been subject to extensive research over the last decades. One possible approach to overcome this obstacle is by embedding sub-wavelength structures into ordinary photonic materials giving rise to so called “artificial materials”. These artificial materials can tailor the dispersion properties of the device7, 8]. If properly designed, PhCs can be used instead of natural highly dispersive materials for achieving high Q- factors in optical resonators. It should be mentioned that the dispersion in the proposed device is controlled by adding periodic structures into the MRR, it is inherently different from works where random structures where used10 It is very different from the annular Bragg resonator geometry, where the subwavelength structures are positioned outside the waveguide, and the periodicity is perpendicular to the propagation direction

One dimensional photonic crystal waveguides

Highly dispersive micro-ring resonator

Highly dispersive micro-ring resonator-based add-drop and notch filters

Numerical simulations

80 Band Gap

Discussion and conclusions