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Novel 1‐to‐N way integrated optical beam splitters using symmetric mode mixing in GaAs/AlGaAs multimode waveguides

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6 Author(s)
Heaton, J.M. ; Defence Research Agency (DRA), Electronics Division, RSRE Malvern, St. Andrews Road, Great Malvern, Worcestershire WR14 3PS, United Kingdom ; Jenkins, R.M. ; Wight, D.R. ; Parker, J.T.
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We report the demonstration of novel GaAs/AlGaAs integrated optical 1‐to‐N way beam splitters which use symmetric mode mixing in center‐fed multimode planar waveguides. Each device has one single‐mode input guide, a carefully chosen length of parallel sided multimode guide, and N equally spaced single‐mode output guides. The mixing of symmetric modes shares the input light equally between the output guides by a symmetric form of the self‐imaging process. We demonstrate experimentally that this type of beam splitter can be used to divide power equally, with high accuracy and low loss, between the N output guides, for values of N between 2 and 20.

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Applied Physics Letters  (Volume:61 ,  Issue: 15 )