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Proceedings Paper

Very low-loss fiber-to-waveguide coupling using diffraction optical element mode converter
Author(s): Si Lu; Yingbai Yan; Edwin Y. B. Pun; Guofan Jin
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Paper Abstract

Very low-loss coupling between standard single-mode fibers (SMF) and high refractive-index waveguides is achieved using diffraction optical element (DOE) as mode converter. The DOE is a beam-shaping element designed based on diffraction optics theory. DOE shapes the mode field of SMF to that of the waveguide, or vice versa. The mode mismatch between them is eliminated. DOE is a pure phase element, which phase distribution optimized by G-S algorithm. The most attractive point of this mode converter is that the DOE can be designed to achieve any mode field distribution of any waveguide structure. This advantage makes DOE a strong and flexible mode converter. Though being a phase element, DOE has certain wavelength tolerance covering a sufficiently wide band, which makes it applicable in multi-wavelength integrated planar lightwave circuits (PLCs). DOE can be approximated by binary optical element (BOE), so that it can be fabricated using existing PLC fabrication step

Paper Details

Date Published: 28 August 2002
PDF: 9 pages
Proc. SPIE 4904, Optical Fiber and Planar Waveguide Technology II, (28 August 2002); doi: 10.1117/12.481241
Show Author Affiliations
Si Lu, Tsinghua Univ. (China)
Yingbai Yan, Tsinghua Univ. (China)
Edwin Y. B. Pun, City Univ. of Hong Kong (Hong Kong)
Guofan Jin, Tsinghua Univ. (China)

Published in SPIE Proceedings Vol. 4904:
Optical Fiber and Planar Waveguide Technology II
Shuisheng Jian; Steven Shen; Katsunari Okamoto, Editor(s)

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