Compact multimode interference couplers with arbitrary power splitting ratio.
We show that it is possible to obtain 2 x 2 waveguide couplers with arbitrary power splitting ratios by interconnecting a pair of unequal width waveguides as the phase-tuning section into the middle of two short MMI sections. These couplers have simple geometry and low loss. They offer valuable new possibilities for designing waveguide-based photonic integrated circuits.
Institute of Electro-Optical Engineering, National Sun Yat-Sen University,70 Lien-Hai Road, Kaohsiung 804, Taiwan. juiyangfeng@gmail.com
David J Y
DJ
Feng
T S
TS
Lay