Wave-coupled LiNbO3 electrooptic modulator for microwave and millimeter- wave modulation

A new technique of phase velocity matching in electrooptic modulators was demonstrated. The results show that the phase velocity mismatch due to material dispersion in traveling-wave LiNbO3 optical waveguide modulators can be greatly reduced by breaking the modulation transmission line into short se...

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Bibliographic Details
Published in:IEEE photonics technology letters 1991-02, Vol.3, p.133-135
Main Authors: BRIDGES, WILLIAMB, SHEEHY, FINBART, SCHAFFNER, JAMESH
Format: Article
Language:English
Online Access:Get full text
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Summary:A new technique of phase velocity matching in electrooptic modulators was demonstrated. The results show that the phase velocity mismatch due to material dispersion in traveling-wave LiNbO3 optical waveguide modulators can be greatly reduced by breaking the modulation transmission line into short segments and connecting each segment to its own surface dipole antenna. The array of antennas is then illuminated by the modulation signal from below at the proper angle to produce a delay from antenna to antenna that matches the optical waveguide's delay. A phase modulator 25 mm in length with five antennas and five transmission line segments was operated from 4.6 to 13 GHz with a maximum phase modulation sensitivity of over 100 deg/W1/2. (I.E.)
ISSN:1041-1135
DOI:10.1109/68.76865