Reflection properties of multimode interference devices

E.C.M. Pennings, R. Roijen, van, M.J.N. Stralen, van, P.J. Waard, de, R.G.M.P. Koumans, B.H. Verbeek

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We report on the reflection properties of multimode interference (MMI) devices: we distinguish between reflection back into the input waveguides and internal resonance modes due to the occurrence of simultaneous self-images. Because of self-imaging, reflection can be extremely efficient, even in the case of MMI devices with optimized transmission. This conclusion is confirmed by the observed spectral behavior of InP-based ring lasers incorporating MMI 3 dB couplers and MMI power splitters. Several techniques are proposed to minimize the influence of these reflections
Original languageEnglish
Pages (from-to)715-718
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number6
Publication statusPublished - 1994


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