Title
Bend coupling through near-zero GVD slow light photonic crystal waveguides
Date Issued
03 September 2018
Access level
open access
Resource Type
journal article
Author(s)
Melo E.G.
De Carvalho D.O.
Universidad de São Paulo
Publisher(s)
Institute of Electrical and Electronics Engineers Inc.
Abstract
Slow light propagation through photonic crystal (PhC) slab devices has great potential to reduce the size and power consumption of silicon photonic optical circuits. Most commonly, slow light routing through photonic crystals is achieved by using W1 waveguide bends operating near their cutoff frequencies. Unfortunately, this leads to optical pulse distortion due the high group velocity dispersion (GVD) associated with these designs. In this letter, however, we study the coupling between slow light waveguides optimized for nearzero GVD and 60° PhC bends. Using numerical methods and the temporal coupled mode theory, we assess the performance of single bends coupled to input/output waveguides, and S-bends composed of two cascaded bends. In this latter, we observe that the bendwaveguide quality factor has great impact over transmission and dispersion. We propose a novel 60° PhC bend design for routing optical modes while maintained reduced dispersion. This is achieved over a-3 dB bandwidth of around 50 nm in devices with slowdown factor up to 40. We show that this 60° PhC bend has good stability under changes in S-bend length and fabrication induced disorder. These results can lead to great improvements in the design of monolithically integrated modulators, switches, (de)multiplexers, and filters based on photonic crystals, as well as on the routing of long optical buffers and delay lines. Index Terms: Photonic crystal, waveguide bend, dispersion engineering, slow light.
Start page
1
End page
12
Volume
10
Issue
5
Language
English
OCDE Knowledge area
Óptica Ingeniería eléctrica, Ingeniería electrónica
Scopus EID
2-s2.0-85052881518
Source
IEEE Photonics Journal
ISSN of the container
19430655
Sponsor(s)
We would like to thank the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the financial support. Research developed with the assistance of HPC resources provided by the Superintendency of Information at the University of São Paulo.
Sources of information: Directorio de Producción Científica Scopus