Title :
Reflection properties of multimode interference devices
Author :
Pennings, E.C.M. ; van Roijen, R. ; van Stralen, M.J.N. ; de Waard, P.J. ; Koumans, R.G.M.P. ; Verbeck, B.H.
Author_Institution :
Philips Res. Lab., Eindhoven, Netherlands
fDate :
6/1/1994 12:00:00 AM
Abstract :
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.<>
Keywords :
III-V semiconductors; indium compounds; integrated optics; laser accessories; light interference; light reflection; optical couplers; optical images; optical waveguides; ring lasers; semiconductor lasers; InP; InP-based ring lasers; MMI couplers; MMI power splitters; back reflection; input waveguides; internal resonance modes; multimode interference devices; optimized transmission; reflection properties; self-imaging; spectral behavior; Couplers; Interference; Laser modes; Mirrors; Optical reflection; Optical waveguides; Power lasers; Resonance; Ring lasers; Waveguide lasers;
Journal_Title :
Photonics Technology Letters, IEEE
