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Proceedings Paper

Velocity-Matched Optical Transmitter
Author(s): Pao -Lo Liu
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Paper Abstract

The concept of using a low dielectric medium in a parallel-plate H-guide to obtain velocity-matching between optical and microwave signals for the LiNb03 modulator is analyzed in detail. From solutions of the wave equations, we have obtained characteristics of the fundamental mode and the design parameters which lead to velocity-matching. The mode is guided by the electrooptic substrate and decays exponentially outside the LiNb01 substrate. The parameter which determines itsproperties is 2a/A , i.e., width of the LiNbO3 substrate divided by the wavelength of the modulation signal. The phase velocity is dispersive, therefore, for a specific substrate width, velocity matching occurs only at a specific modulation frequency. A modulator built with such a velocity-matched electrode is expected to have only a finite bandwidth centered around the design frequency. Details of the analysis and characteristics of the H-guide are discussed in this paper.

Paper Details

Date Published: 17 January 1989
PDF: 7 pages
Proc. SPIE 0995, High Frequency Analog Communications, (17 January 1989); doi: 10.1117/12.960141
Show Author Affiliations
Pao -Lo Liu, State University of New York at Buffalo (United States)

Published in SPIE Proceedings Vol. 0995:
High Frequency Analog Communications
Paul Sierak, Editor(s)

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