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An improved effective index method for planar multimode waveguide design on an silicon-on-insulator (SOI) platform

Le T T

Optica Applicata

2013

Vol. 43, nr 2

s. 271--277

In this paper, an improved effective index method (EIM) for designing planar multimode waveguides on the silicon-on-insulator (SOI) platform is presented. The proposed method predicts the evolution of the fields more accurately than the conventional effective index method. This improved method is particularly suited to the design of multimode interference (MMI) couplers.

Improving the self-imaging in multimode interference (MMI) couplers

Yin R.

Optica Applicata

2011

Vol. 41, nr 3

679--685

A new structure is firstly proposed to be used as the multimode interference (MMI) region in this paper. For comparison with conventional MMI region, two extra layers with thin thickness and lower index beside the core layer are introduced to increase the difference of propagation constant between the first two modes. Meanwhile, high order modes are not affected so much. Thus the propagation constant errors of the guided modes are decreased and better self-imaging is realized. The designing process is also given in this paper. This new structure can be applied to any kind of M×N MMI couplers. By incorporating this new structure, an MMI based power splitter is 1/6 shorter and contrast of MMI optical switch is 10 dB higher according to the results of exact mode analysis.