Photonic-Crystal Demultiplexer With Improved Crosstalk by Second-Order Cavity Filtering

Author

Benisty, Henri ; Cambournac, Cyril ; Laere, Frederik Van ; Thourhout, Dries Van

Author_Institution

Lab. Charles Fabry, Univ Paris-Sud, Palaiseau, France

Volume

28

Issue

8

fYear

2010

fDate

4/15/2010 12:00:00 AM

Firstpage

1201

Lastpage

1208

Abstract

In this paper, we implement on a silicon-on-insulator (SoI) platform a photonic-crystal demultiplexer that operates on the principle of mini-stopbands of broader waveguides. Previous InP-based membrane versions showed modest crosstalk at 10 nm spacing. Here, we implement a second cavity in the form of a second parallel waveguide almost identical to the core one. Simulations employing three-modes coupled-mode theory and finite-difference time-domain help optimizing the coupling. The experimental realization with deep ultraviolet exposure and grating couplers is the first of this demux strategy on SoI. It successfully shows crosstalk in the 15-20 dB range on a very small footprint.

Keywords

cavity resonator filters; channel spacing; coupled mode analysis; demultiplexing equipment; diffraction gratings; finite difference time-domain analysis; integrated optics; integrated optoelectronics; optical communication equipment; optical couplers; optical crosstalk; optical filters; optical losses; optical waveguides; photonic crystals; silicon-on-insulator; channel spacing; deep ultraviolet exposure; finite-difference time-domain analysis; grating couplers; insertion loss; ministopband principle; optical crosstalk; photonic-crystal demultiplexer; second parallel waveguide; second-order cavity filtering; silicon-on-insulator; three-mode coupled-mode theory; Demultiplexer; mini-stopband; photonic crystal; silicon-on-insulator (SoI); waveguide;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2010.2043057

Filename

5419095