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Planar monomode optical couplers based on multimode interference effects

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6 Author(s)
Soldano, L.B. ; Dept. of Electr. Eng., Delft Univ. of Technol., Netherlands ; Veerman, F.B. ; Smit, M.K. ; Verbeek, B.
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The self-imaging property of a homogeneous multimoded planar optical waveguide has been applied in the design of passive planar monomode optical couplers based on multimode interference (MMI). Based on these designs, 3 dB and cross couplers were fabricated in SiO2 /Al2O3/SiO2 channel waveguides on Si substrates. Theoretical predictions and experimental results at 1.52-μm wavelength are presented which demonstrate that MMI couplers offer high performance: on-chip excess loss better than 0.5 dB, high reproducibility, low polarization dependence and small device size

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Lightwave Technology, Journal of  (Volume:10 ,  Issue: 12 )