Microwave Characteristics of a Traveling-Wave Type LiNbO3 Optical Modulator with Superconducting Electrodes

Keiji YOSHIDA  Noriaki HORIGUCHI  Yutaka KANDA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E76-C   No.8   pp.1287-1290
Publication Date: 1993/08/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on High-Temperature Superconducting Electronics)
Category: 
Keyword: 
LiNbO3 optical modulator,  superconducting electrodes,  traveling-wave type optical modulator,  microwave characteristics,  

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Summary: 
Microwave characteristics of a LiNbO3 optical modulator employing superconductor electrodes (Pb-In-Au) as a transmission line of a traveling signal has been studied experimentally in the temperature range from 300 K to 4.2 K. At frequencies between 8 GHz and 12 GHz it is shown that the obtained modulation efficiency increases as expected from theory when the superconductor undergoes the transition from a normal state to a superconducting state. The present results dumonstrate the possible applications of superconducting electrodes to high performance LiNbO3 optical modulators.