Velocity-Matched Optical Transmitter

Pao -Lo Liu

doi:10.1117/12.960141

17 January 1989 Velocity-Matched Optical Transmitter

Pao -Lo Liu

Proceedings Volume 0995, High Frequency Analog Communications; (1989) https://doi.org/10.1117/12.960141
Event: O-E/Fiber LASE '88, 1988, Boston, MA, United States

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.

Citation Download Citation

Pao -Lo Liu "Velocity-Matched Optical Transmitter", Proc. SPIE 0995, High Frequency Analog Communications, (17 January 1989); https://doi.org/10.1117/12.960141

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