Optical Waveguide Phase Controller for Microwave Signals Generated by Heterodyne Photodetection

Yoshiaki KAMIYA  Wataru CHUJO  Masayuki FUJISE  

IEICE TRANSACTIONS on Electronics   Vol.E76-C   No.2   pp.305-307
Publication Date: 1993/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Issue on Optical/Microwave Interaction Devices, Circuits and Systems)
Category: Fiber Optic Radio Links
heterodyne photodetection,  optical waveguide,  electro-optic phase shifting,  microwave phase controller,  

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This paper presents the successful performance of an optical waveguide phase controller for microwave signals generated by heterodyne photodetection. A 22 optical waveguide structure with four optical phase shifters was fabricated on a LiNbO3 substrate. As a result of heterodyne photodetection of two optical signals from wavelength-tunable laser diodes, two microwave signals at 585 MHz were generated and phase shifted in the manner of electro-optical phase retardation. The monolithic waveguide structure allowed linear phase shifting more than 1800 degrees. Similar phase shifting performances were also confirmed over a wide microwave frequency range from 300 MHz to 1.3 GHz. The optical waveguide structure demonstrated here will be applicable to fiber-optic fed microwave systems such as a phased array antenna.