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

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5 Author(s)
Kawano, K. ; Opto-Electron. Lab., NTT, Kanagawa, Japan ; Kitoh, T. ; Mitomi, O. ; Nozawa, T.
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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.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:1 ,  Issue: 2 )