A wide-band and low-driving-power phase modulator employing a Ti:LiNbO/sub 3/ optical waveguide at 1.5 mu m

Author

Kawano, Kenji ; Kitoh, Tsutomu ; Mitomi, Osamu ; Nozawa, Toshinori ; Jumonji, Hiromichi

Author_Institution

Opto-Electron. Lab., NTT, Kanagawa, Japan

Volume

1

Issue

2

fYear

1989

Firstpage

33

Lastpage

34

Abstract

A wide-band and low-driving-power Ti:LiNbO/sub 3/ optical modulator at 1.5- mu m wavelength is described. A relatively thick SiO/sub 2/ buffer layer is effectively utilized to improve phase velocity mismatch between the microwaves and optical waves. A coplanar waveguide is used as an efficient traveling-wave electrode, and is designed utilizing the upper bound calculation in the spectral domain. Wide-band modulation of 12 GHz (3 dB optical and 6 dB electrical cutoff frequency) and small driving-power-to-modulation-bandwidth ratio of 20 mW/GHz are realized.<>

Keywords

electro-optical devices; integrated optics; lithium compounds; optical modulation; optical waveguides; titanium; 1.5 micron; LiNbO/sub 3/:Ti; SiO/sub 2/ buffer layer; coplanar waveguide; driving-power-to-modulation-bandwidth ratio; low-driving-power phase modulator; microwaves; optical waves; phase velocity mismatch; traveling-wave electrode; upper bound calculation; wideband modulator; Buffer layers; Coplanar waveguides; Cutoff frequency; Electrodes; Optical buffering; Optical modulation; Optical waveguides; Phase modulation; Upper bound; Wideband;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.91000

Filename

91000