Design of blazed crossed gratings for beam couplers in large-core optical fibers

Takeshi Kobayashi; Tetsuya Saitoh; Yoshiyuki Suzuki; Hideyuki Tanaka; Shigeru Kawai

doi:10.1117/12.424850

16 April 2001 Design of blazed crossed gratings for beam couplers in large-core optical fibers

Takeshi Kobayashi, Tetsuya Saitoh, Yoshiyuki Suzuki, Hideyuki Tanaka, Shigeru Kawai

Proceedings Volume 4291, Diffractive and Holographic Technologies for Integrated Photonic Systems; (2001) https://doi.org/10.1117/12.424850
Event: Symposium on Integrated Optics, 2001, San Jose, CA, United States

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.

Citation Download Citation

Takeshi Kobayashi, Tetsuya Saitoh, Yoshiyuki Suzuki, Hideyuki Tanaka, and Shigeru Kawai "Design of blazed crossed gratings for beam couplers in large-core optical fibers", Proc. SPIE 4291, Diffractive and Holographic Technologies for Integrated Photonic Systems, (16 April 2001); https://doi.org/10.1117/12.424850

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KEYWORDS

Diffraction

Diffraction gratings

Optical design

Diffractive optical elements

Optical fibers

Fourier transforms

Phase shift keying

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