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Proceedings Paper

Design of blazed crossed gratings for beam couplers in large-core optical fibers
Author(s): Takeshi Kobayashi; Tetsuya Saitoh; Yoshiyuki Suzuki; Hideyuki Tanaka; Shigeru Kawai
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Paper Abstract

We developed a novel design technique for multi-fanout surface-relief diffractive optical elements (DOEs) with high diffraction efficiencies. This technique also has the possibility for controlling both the directions and power ratio for output beams. It easily provides us phase distributions of DOEs, because iterative calculation procedures are not used. The design concept includes combining with blazed gratings to a crossed grating. Each blazed grating has its own phase distribution to achieve its diffraction efficiency high. The multi-fanout DOEs are accomplished by overlapping the blazed gratings. This design technique provides DOEs with high diffraction efficiency of more than 82 % by computer simulations based on the Fresnel-Kirchhoff diffraction. The diffraction efficiency has its minimum value when the output-beam power ratio is even. We fabricated two fan-outs DOEs with 1:16 output-beam power ratio designed by this technique. The measured diffraction efficiency is well agreed with the simulation result of 88 %. This technique may be suitable for designing large-core beam-couplers with unequal output-beam power ratio.

Paper Details

Date Published: 16 April 2001
PDF: 8 pages
Proc. SPIE 4291, Diffractive and Holographic Technologies for Integrated Photonic Systems, (16 April 2001); doi: 10.1117/12.424850
Show Author Affiliations
Takeshi Kobayashi, Fuji Electric Corporate R&D Ltd. (Japan)
Tetsuya Saitoh, Fuji Electric Corporate R&D Ltd. (Japan)
Yoshiyuki Suzuki, Fuji Electric Corporate R&D Ltd. (Japan)
Hideyuki Tanaka, Fuji Electric Corporate R&D Ltd. (Japan)
Shigeru Kawai, Univ. of Industrial Technology (Japan)

Published in SPIE Proceedings Vol. 4291:
Diffractive and Holographic Technologies for Integrated Photonic Systems
Richard L. Sutherland; Dennis W. Prather; Ivan Cindrich, Editor(s)

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