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Symmetrical waveguide devices fabricated by direct UV writing

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2 Author(s)
Faerch, K. ; COM Center, Tech. Univ. Denmark, Lyngby, Denmark ; Svalgaard, M.

Power splitters and directional couplers fabricated by direct UV writing in index matched silica-on-silicon samples can suffer from an asymmetrical device performance, even though the UV writing is carried out in a symmetrical fashion. This effect originates from a reduced photosensitivity in the vicinity of previous exposed areas. The imbalance can be counteracted by an appropriate reduction of the applied scan velocity in areas, where a previous scan has been carried out nearby.

Published in:

Photonics Technology Letters, IEEE  (Volume:14 ,  Issue: 2 )