Very low-loss fiber-to-waveguide coupling using diffraction optical element mode converter

Si Lu; Yingbai Yan; Edwin Y. B. Pun; Guofan Jin

doi:10.1117/12.481241

28 August 2002 Very low-loss fiber-to-waveguide coupling using diffraction optical element mode converter

Si Lu, Yingbai Yan, Edwin Y. B. Pun, Guofan Jin

Proceedings Volume 4904, Optical Fiber and Planar Waveguide Technology II; (2002) https://doi.org/10.1117/12.481241
Event: Asia-Pacific Optical and Wireless Communications 2002, 2002, Shanghai, China

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

Citation Download Citation

Si Lu, Yingbai Yan, Edwin Y. B. Pun, and Guofan Jin "Very low-loss fiber-to-waveguide coupling using diffraction optical element mode converter", Proc. SPIE 4904, Optical Fiber and Planar Waveguide Technology II, (28 August 2002); https://doi.org/10.1117/12.481241

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