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Design and characterization of a mode-splitting Ψ-junction

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3 Author(s)
Veldhuis, G.J. ; MESA Res. Inst., Twente Univ., Enschede, Netherlands ; Berends, J.H. ; Lambeck, P.V.

It will he shown In this paper, that the mode conversion factor (MCF) as defined for Y-junctions, can be profitably applied for the design of three branch junctions for splitting the three lowest-order modes of a channel waveguide. Accordingly, these so-called mode-splitting Ψ-junctions were designed for implementation in PECVD SiON-technology. Propagation calculations point to crosstalk levels well below -20 dB at 10-20 mm junction length. The produced Ψ-junctions show crosstalk of less than -17 dB, mainly originating from the nonhomogeneity of the refractive indexes of the SiON layers

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Lightwave Technology, Journal of  (Volume:14 ,  Issue: 7 )