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Proceedings Paper

Waveguide-grating couplers for illumination of photonic antennas
Author(s): Robert Magnusson; Zhongshan Liu; Debra D. Wawro; Preston P. Young; DongHo Shin
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Paper Abstract

To obtain uniform illumination of photonic reconfigurable antennas, a waveguide grating with a nonuniform grating profile may be used. Theoretical studies using approximate models indicate that the grating profile should have a hyperbolic spatial variation along the length of the coupler. This yields a spatially varying diffraction efficiency that compensates for the loss of light as it is diffracted out of the waveguide. Utilizing a holographic interferometer with a computer controlled shutter in one arm, gratings with appropriate spatial profile variation have been recorded in photoresist and transferred to produce photopolymer waveguide gratings. These planar couplers are integrated with optical fiber bundles for input light delivery. The grating periods are chosen to produce orthogonally propagating output waves. A dielectric mirror arrangement is used to reflect the parasitic diffracted order back onto the antenna element. The best devices obtained to date exhibit output uniformity of plus or minus 6% over a coupler length of 20 mm with total efficiency exceeding 50%.

Paper Details

Date Published: 1 July 1997
PDF: 8 pages
Proc. SPIE 3075, Photonic Processing Technology and Applications, (1 July 1997); doi: 10.1117/12.277624
Show Author Affiliations
Robert Magnusson, Univ. of Texas/Arlington (United States)
Zhongshan Liu, Univ. of Texas/Arlington (United States)
Debra D. Wawro, Univ. of Texas/Arlington (United States)
Preston P. Young, Univ. of Texas/Arlington (United States)
DongHo Shin, Univ. of Texas/Arlington (United States)


Published in SPIE Proceedings Vol. 3075:
Photonic Processing Technology and Applications
Andrew R. Pirich; Raymond K. Boncek, Editor(s)

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