The use of a complex short-period (Bragg) grating which combines matched periodic
modulations of refractive index and loss/gain allows asymmetrical mode coupling within a …

Tunable add/drop filter based optical interconnects are an integral part of data centers as
well as optical communications. Although add/drop filters based on ring resonators and …

We propose a refractive-index sensor that operates on the principle of exciting the long-
range surface plasmon mode of a metal-coated waveguide with a long-period grating …

Optical superlattices with sublattice symmetry subjected to a synthetic imaginary gauge field
undergo a topological phase transition in the Bloch energy spectrum, characterized by the …

A band-pass filter based on mechanically-induced multi-π-shifted long-period fiber gratings
is proposed. The pass band width of the filter depends on the number N of the sub-gratings …

We demonstrate long-period fiber gratings made in a straight standard optical fiber via a
CO2 laser side irradiation that couples light between modes of different azimuthal symmetry …

Grating assisted surface plasmon resonance waveguide grating has been designed and
optimized for the sensing application. Adaptive particle swarm optimization in conjunction …

Integrating an active medium with a filtering component can bring new functionalities
compared with configurations where the two stages (units) are placed in series. We exploit …

We present a rigorous theoretical and experimental analysis of signal propagation along a
long-period fiber grating (LPFG) made in an Erbium-doped amplifying fiber (EDF). First …

Long-period waveguide gratings (LPWGs) are designed and fabricated on silicon-on-
insulator (SOI) substrates with an amorphous silicon (a-Si) layer incorporated as the …