Accession Number : ADP008113

Title :   Integrated Magnetooptic Bragg Cell Module in Tapered YIG-GGG Waveguide,

Corporate Author : CALIFORNIA UNIV IRVINE

Personal Author(s) : Wang, C. L. ; Tsai, C. S.

Report Date : APR 1992

Pagination or Media Count : 2

Abstract : Magnetostatic waves-based guided-wave magnetooptic (MO) Bragg cells in yttrium iron garnet-gadolinium gallium garnet (YIG-GGG) waveguide possess the unique capabilities of electronically tunable carrier frequency beyond X-band microwave frequencies and GHz bandwidth, and are therefore inherently capable of direct RF signal processing at the carrier frequencies from 0.5 to 26.5 GHz. Other capabilities include multiport light beam scanning and switching at a speed one- to three-order of magnitude higher than that of acoustooptic (AO) Bragg cells. Obviously, it is desirable to incorporate lenses and lens arrays in the same YIG-GGG waveguide substrate to realize integrated MO Bragg cell modules. Negative-index change waveguide lenses which combine analog Fresnel and chirp gratings were fabricated recently in LiNbO3, GaAs and YIG-GGG waveguide substrates using ion-milling technique. It has been concluded that the thinner the waveguide, the smaller the required milled-depth in the gratings in order to produce desired index changes, and thus ensure high lens throughput. It has also been shown most recently that the MO Bragg bandwidth is approximately proportional to the thickness of the YIG waveguide. Therefore, there exists contradictory requirements on the waveguide thickness for achieving both wideband MO interaction and high lens throughput.

Descriptors :   *MAGNETOOPTICS, *SYMPOSIA, *OPTICAL WAVEGUIDES, ACOUSTOOPTICS, BANDWIDTH, CARRIER FREQUENCIES, FREQUENCY, GALLIUM ARSENIDES, LENSES, LIGHT, MAGNETOSTATICS, MICROWAVES, SCANNING, SIGNAL PROCESSING, SIGNALS, SUBSTRATES, SWITCHING, THROUGHPUT, WAVEGUIDES, X BAND, YTTRIUM, YTTRIUM IRON GARNET, RESONANT FREQUENCY.

Subject Categories : Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE