Dual-Depletion-Region Electroabsorption Modulator With Evanescently Coupled Waveguide for High-Speed ( > 40 GHz) and Low Driving-Voltage Performance

Author

Shi, J.-W. ; Shiao, A.-C. ; Chu, C.-C. ; Wu, Y.-S.

Author_Institution

Dept. of Electr. Eng., Nat. Central Univ., Taoyuan

Volume

19

Issue

5

fYear

2007

fDate

3/1/2007 12:00:00 AM

Firstpage

345

Lastpage

347

Abstract

We demonstrate a novel structure of a electroabsorption modulator (EAM) at a 1.55-mum wavelength. By incorporating the epilayer structure of dual-depletion-region EAM with an evanescently coupled optical waveguide, the demonstrated device can achieve low electrical return loss (-20 dB at ~60 GHz), wide 3-dB bandwidth (60 GHz) of electrical transmission loss, wide electrical-to-optical bandwidth (45 GHz), and low 20-dB static driving voltage (V_20dB, 1.65 V) with extremely small polarization dependency. This new structure can not only achieve excellent figures-of-merit but release the burden imposed on downscaling the core width or length of high-speed/low driving-voltage EAM without using epitaxial regrowth or ion-implantation techniques to isolate the active and passive regions

Keywords

electro-optical modulation; electroabsorption; optical communication equipment; optical losses; optical waveguides; 1.55 mum; 1.65 V; 45 GHz; 60 GHz; electrical return loss; electrical transmission loss; electroabsorption modulator; evanescently coupled waveguide; Bandwidth; High speed optical techniques; Optical coupling; Optical devices; Optical losses; Optical modulation; Optical surface waves; Optical waveguides; Propagation losses; Voltage; Electroabsorption modulators (EAMs); multiple quantum-well (MQW); optical communication;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2007.891637

Filename

4116748