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SYNGRAT, an electrooptically controlled tunable filter with a synthesized grating structure

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


Optical and Quantum Electronics 27 (1995), Nr.10, S.887-96
ISSN: 0306-8919
ISSN: 1572-817X
Fraunhofer HHI ()
diffraction gratings; electro-optical filters; optical communication equipment; optical crosstalk; optical design techniques; tuning; syngrat; electrooptically controlled tunable filter; synthesized grating structure; single-stage filter; weak electrooptical effects; tuning range; channel separation; full control; filter characteristics; coupling efficienc; very large tuning range; efficient side-lobe suppression; crosstalk; functionality; flexibility

A new design for a single-stage filter, called synthesized grating structure (SYNGRAT), is presented and investigated theoretically. It is shown that, even for weak electrooptical effects, the tuning range can be as high as 450 channels for a channel separation of 1 nm. The electrooptically synthesized grating structure gives full control of the filter characteristics in terms of channel separation, side-lobe suppression and coupling efficiency over a very large tuning range. Efficient side-lobe suppression can be used to reduce the crosstalk. This concept gives new freedom of functionality and flexibility.