Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
Journal Home About Issues in Progress Current Issue All Issues Feature Issues

Mode matching technique for highly efficient coupling between dielectric waveguides and planar photonic crystal circuits

P. Sanchis, J. Martí, J. Blasco, A. Martínez, and A. García

Open Access Open Access

Abstract

In this paper, a mode matching technique for highly efficient coupling between dielectric silica waveguides (SWG) and planar photonic crystal (PPC) waveguides based on setting localized defects in a PPC tapered waveguide is reported. The introduction of multiple defects is designed properly depending on mode mismatching arising from the different widths of the SWG and the PPC waveguide. The procedure to obtain the optimum defects configuration is described. Transmission efficiencies above 80% at a wavelength of 1.55μm are reported improving significantly the transmission efficiencies achieved with conventional PPC tapered structures without defects. Furthermore, the feasibility of the coupling technique for both input/output coupling over a large frequency band is shown.

©2002 Optical Society of America

Full Article  |  PDF Article
More Like This
Coupling technique for efficient interfacing between silica waveguides and planar photonic crystal circuits

Yuan-Fong Chau, Tzong-Jer Yang, and Win-Der Lee
Appl. Opt. 43(36) 6656-6663 (2004)

Two compact structures for perpendicular coupling of optical signals between dielectric and photonic crystal waveguides

Michael E. Potter and Richard W. Ziolkowski
Opt. Express 10(15) 691-698 (2002)

Grating-assisted coupling of optical fibers and photonic crystal waveguides

Wan Kuang, Cheolwoo Kim, Andrew Stapleton, and John D. O’Brien
Opt. Lett. 27(18) 1604-1606 (2002)

View More...

Supplementary Material (2)

Media 1: MOV (1576 KB)     
Media 2: MOV (1570 KB)     

Cited By

Optica participates in Crossref's Cited-By Linking service. Citing articles from Optica Publishing Group journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (5)
Fig. 1.
Fig. 1. Schematic view of the structures considered. (a) a 2μm-wide/ 0.5μm-long and (b) a 4μm-wide/1μm-long planar photonic crystal (PPC) taper each one with a different defects configuration are used to couple light both into and out of a finite PPC waveguide from a silica waveguide (SWG). The lattice constant of the PPC is a and the radius of the rods is R.

Download Full Size | PDF

Fig. 2.
Fig. 2. Transmission spectra as a function of the normalized frequency for the structure shown in Fig.1(a) taking into account different SWG widths, w=1.5μm and w= 3μm, and with and without the proposed coupling technique.

Download Full Size | PDF

Fig. 3.
Fig. 3. (a) Normalized transmitted power as a function of the relative position of a localized defect in the z-axis normalized to the lattice constant and (b) as a function of the radius of the defects, rext and rint , normalized to the radius of the rods, R, and located the former at zext =0.59a and the latter at zint =1.52a, both for the PPC taper shown in Fig.1(b).

Download Full Size | PDF

Fig. 4.
Fig. 4. Movies (both 1.6 MB) of the electric field intensity input coupling from the SWG to the PPC waveguide employing the PPC taper shown in Fig. 1(b), (a) without and (b) with the optimized two-defects configuration. [Media 2]

Download Full Size | PDF

Fig. 5.
Fig. 5. Transmission spectra as a function of the normalized frequency for the structure shown in Fig.1(b) for a SWG width of 3 μm with and without the proposed coupling technique. In the former case, two spectra are depicted showing the influence of the normalized frequency employed in the optimization procedure.

Download Full Size | PDF

Select as filters
Select Topics Cancel
Top
       
© Copyright 2024 | Optica Publishing Group. All rights reserved, including rights for text and data mining and training of artificial technologies or similar technologies.
Privacy | Terms of Use