Demonstration of Compact 2x2 Multimode Interference Coupler on Silicon Nanomembrane

High-performance 90° hybrid based on a silicon-on-insulator multimode interference coupler.

We propose a multimode interference coupler (MMI) design for high-index-contrast technologies based on a shallowly etched multimode region, which is, for the first time to our knowledge, directly coupled to deeply etched input and output waveguides. This reduces the phase errors associated with the high-index contrast, while still allowing for a very compact layout. Using this structure, we fab...

1x12 Even Fanout Using Multimode Interference Optical Beam Splitter on Silicon Nanomembrane

Modeling and experimental observation of an on-chip two-dimensional far-field interference pattern.

In this paper, we model and experimentally observe the far-field radiation produced by interfering beams propagating in two-dimensional (2D) slab waveguides. Using a transmission-line analogy, we compare the 2D propagation with standard three-dimensional (3D) far-field representations and derive the 2D conditions for using standard far-field approximations. Then we test our theoretical results ...

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 nanomembra...

High efficiency diffractive grating coupler based on transferred silicon nanomembrane overlay on photonic waveguide

We report here the design of a new type of high efficiency grating coupler, based on single crystalline Si nanomembrane overlay and stacking. Such high efficiency diffractive grating couplers are designed for the purpose of coupling light between single mode fibres and nanophotonic waveguides, and for the coupling between multiple photonic interconnect layers for compact three-dimensional verti...