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Y-branch-the key component for crosstalk reduced optical switches: modelling analysis

: Nolting, H.-P.; Gravert, M.; Reden, W. von


Optical and Quantum Electronics 29 (1997), Nr.2, S.275-84
ISSN: 0306-8919
ISSN: 1572-817X
Fraunhofer HHI ()
compensation; eigenvalues and eigenfunctions; electro-optical switches; integrated optics; mode matching; optical crosstalk; optical waveguide theory; optical waveguides; y-branches; crosstalk reduced optical switches; modelling analysis; switching devices; waveguide structures; abrupt waveguide changes; bpm calculation; eigenmode analysis; physical mode behaviour; crosstalk compensation; digital switch; delta beta -reversal switch; frequency division multiplexing; optical communication equipment

A novel design method for switching devices is demonstrated based on waveguide structures with Y-branches and abrupt waveguide changes as key elements. A combination of BPM calculation and eigenmode analysis is shown to be a promising tool to obtain deep insight into the physical mode behaviour. Based on the analysis, a mode converter to match the eigenmodes in amplitudes and phase can be developed and introduced as a correcting device. This method is demonstrated for the crosstalk compensation of a digital switch (DOS) and a Delta beta -reversal switch. A crosstalk of about -20 dB can be reduced to -40 dB by this method.