Closed-form expressions for the optimization of high speed electro-optical modulators

Compact closed-form mathematical expressions for the propagation parameters (characteristic impedance, effective permittivity and attenuation) of coplanar waveguides (CPW) are presented. The formulas take into account asymmetric structures, thick electrodes and two-layered substrates, and thus are p...

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Bibliographic Details
Published in:	Optics and laser technology Vol. 49; pp. 296 - 300
Main Authors:	Ibarra Fuste, Jose A., Santos Blanco, Maria C.
Format:	Journal Article Publication
Language:	English
Published:	Elsevier Ltd 01-07-2013
Subjects:	Electro-optical modulator Enginyeria electrònica LiNbO3 Optoelectronics Optoelectrònica Àrees temàtiques de la UPC LiNbO3 Optoelectronics Electro-optical modulator
Online Access:	Get full text
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Summary:	Compact closed-form mathematical expressions for the propagation parameters (characteristic impedance, effective permittivity and attenuation) of coplanar waveguides (CPW) are presented. The formulas take into account asymmetric structures, thick electrodes and two-layered substrates, and thus are perfectly tailored for the optimization of electro-optical modulators. Excellent agreements, within a range of frequencies up to 100GHz, are found with full-wave finite elements results from commercial software (HFSS) and with measures reported in the literature, for material and geometrical CPW parameters of practical relevance for the design of electro-optical modulators. ► Compact closed-form formulae for the design of electro-optical modulators are given. ► Both thin-film and buffered layered modulators can be analyzed using these formulae. ► The presented formulae agree perfectly with measures reported in the literature. ► The formulae provide a powerful tool for modulator designs and optimizations.
ISSN:	0030-3992 1879-2545
DOI:	10.1016/j.optlastec.2013.01.013