Digitally Controlled Phase Shifter Using an SOI Slot Waveguide With Liquid Crystal Infiltration

Author

Yufei Xing ; Ako, Thomas ; George, John P. ; Korn, Dietmar ; Hui Yu ; Verheyen, Peter ; Pantouvaki, Marianna ; Lepage, Guy ; Absil, Philippe ; Ruocco, Alfonso ; Koos, Christian ; Leuthold, Juerg ; Neyts, Kristiaan ; Beeckman, Jeroen ; Bogaerts, Wim

Author_Institution

Dept. of Inf. Technol., Ghent Univ., Ghent, Belgium

Volume

27

Issue

12

fYear

2015

fDate

June15, 15 2015

Firstpage

1269

Lastpage

1272

Abstract

We demonstrate a phase shifter using a silicon slot waveguide infiltrated with liquid crystal. For a 1-mm long device we achieve 73π phase shift with a 5 V voltage, with a voltage-length product of 0.0224 V· mm ~1 V. We drive the phase shifter with a digital 1 V, duobinary pulsewidth-modulated signal, or a 1 V frequency-modulated signal. This enables direct digital CMOS control of an analog optical phase shifter.

Keywords

CMOS digital integrated circuits; integrated optics; liquid crystals; optical phase shifters; optical waveguides; silicon-on-insulator; SOI slot waveguide; Si; analog optical phase shifter; digitally controlled phase shifter; direct digital CMOS control; duobinary pulsewidth-modulated signal; frequency-modulated signal; liquid crystal infiltration; size 1 mm; voltage 5 V to 1 V; voltage-length product; Frequency modulation; Liquid crystals; Liquid waveguides; Optical waveguides; Phase shifters; Photonics; Silicon; Liquid Crystal Phase modulator; Silicon Photonics; Silicon photonics; Slot Waveguide; liquid crystal; phase modulator; slot waveguide;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2015.2416438

Filename

7067358