Title :
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
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;
Journal_Title :
Photonics Technology Letters, IEEE
