Propagation in a directional coupler of parallel microring coupled-resonator optical waveguides

Chremmos, I; Uzunoglu, N

dc.contributor.author	Chremmos, I	en
dc.contributor.author	Uzunoglu, N	en
dc.date.accessioned	2014-03-01T01:29:04Z
dc.date.available	2014-03-01T01:29:04Z
dc.date.issued	2008	en
dc.identifier.issn	0030-4018	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19103
dc.subject	Condition Dependence	en
dc.subject	Directional Coupler	en
dc.subject	Dispersive Equation	en
dc.subject	Resonant Frequency	en
dc.subject	Satisfiability	en
dc.subject	Coupled Resonator Optical Waveguide	en
dc.subject.classification	Optics	en
dc.subject.other	Directional couplers	en
dc.subject.other	Energy gap	en
dc.subject.other	Frequency bands	en
dc.subject.other	Frequency shift keying	en
dc.subject.other	Wave equations	en
dc.subject.other	Coupled-resonator optical waveguides (CROW)	en
dc.subject.other	Floquet conditions	en
dc.subject.other	Microring resonators	en
dc.subject.other	Optical waveguides	en
dc.title	Propagation in a directional coupler of parallel microring coupled-resonator optical waveguides	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.optcom.2008.02.023	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.optcom.2008.02.023	en
heal.language	English	en
heal.publicationDate	2008	en
heal.abstract	The fundamental concept of coupled-resonator optical waveguides (CROWs) is for the first time taken a step farther to propose the more complicated case of coupled-resonator directional couplers, by analyzing the phenomenon of propagation in two parallel chains of microring resonators. Using the method of transfer matrices it is shown that the infinite coupler supports even and odd supermodes that satisfy frequency-shifted replicas of the familiar CROW dispersion equation as well as modified periodic Floquet conditions. Depending on the relative coupling strengths between neighboring resonators in the same chain and between the two chains, the frequency bands of the supermodes can overlap or be completely separated, resulting, in the latter case, to a complete bandgap around the central resonance frequency of the microrings. Three frequency windows, corresponding to totally different properties of directional coupling, are defined through this band-overlap mechanism along the increased total bandwidth of the coupler. These predictions are fully confirmed in the response of the realistic finite-length version of the considered coupler which is also analyzed. (C) 2008 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Optics Communications	en
dc.identifier.doi	10.1016/j.optcom.2008.02.023	en
dc.identifier.isi	ISI:000256127400025	en
dc.identifier.volume	281	en
dc.identifier.issue	12	en
dc.identifier.spage	3381	en
dc.identifier.epage	3389	en