Optimum access waveguide width for 1 x N multimode interference couplers on silicon nanomembrane.
We derived an analytical formula for the optimum width of the access waveguides of 1 x N multimode interference (MMI) couplers. Eigenmode-decomposition-based simulations show that the optimum width relation corresponds to the points of diminishing returns in both insertion loss and output uniformity versus access waveguide width. We fabricate and characterize 1 x 12 MMI couplers on a nanomembrane of silicon-on-insulator substrate. The experimental investigations demonstrate that the analytical results can be reliably used as a design rule for MMI couplers with large number of outputs.
Hosseini
Amir
A
Microelectronic Research Center, Department of Electrical and Computer Engineering, University of Texas, 10100 Burnet Road, Austin, Texas 78758, USA. ahoss@mail.utexas.edu
Subbaraman
Harish
H
Kwong
David
D
Zhang
Yang
Y
Chen
Ray T
RT