High-efficiency single-order waveguide grating coupler.
High-efficiency single-order grating coupling between an optical waveguided mode and a volume wave is achieved by means of a double-sided corrugated cover film that has phase-shifted undulations. A greater than 90% outcoupling ratio into air is demonstrated for weakly guiding ion-exchanged waveguides. The conditions for efficient coupling and the tolerances on them are established.
Avrutsky
I A
IA
Institute of General Physics, Academy of Sciences of the USSR, 117942 Moscow, USSR.
Svakhin
A S
AS
Sychugov
V A
VA
Parriaux
O
O