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Architecture of crosstalk-reduced digital optical 2*2 switch (CRDOS)

: Nolting, H.-P.; Gravert, M.


IEEE Photonics Technology Letters 7 (1995), No.11, pp.1294-6
ISSN: 1041-1135
Journal Article
Fraunhofer HHI ()
compensation; electro-optical switches; optical crosstalk; switching networks; crosstalk-reduced digital optical 2*2 switch architecture; coherent crosstalk; optical space switch matrices; optical transparent networks; crosstalk source; electrooptical digital switches; crosstalk compensating technique; integration; general mode converter; correcting device; short optical switches

Coherent crosstalk of optical space switch matrices is a key problem of optical transparent networks. An analysis of the crosstalk sources of electrooptical digital switches (DOS) is given and a new crosstalk compensating technique based on the integration of a general mode converter as correcting device into a 3*2 DOS is proposed and theoretically investigated. It can be shown, that a -20 dB crosstalk 2*2 DOS device can be enhanced to -40 dB. This architecture leads to an increase of the device length by only a few percent. It opens up the possibility to realize short optical switches for larger matrices.