Meandering waveguide distributed feedback lightwave elements: phasor diagram analysis

Abstract

Meandering waveguide distributed feedback (DFB) structures are introduced as novel photonic lightwave circuits elements and their amplitude and phase response are studied in frequency and phasor domain. A preliminary transfer matrix method analysis is applied for taking the coupling purely directional and with constant coefficient on geometrically symmetric and anti-symmetric elements. The meandering loop mirror is the building block of all meandering waveguide based lightwave circuit elements. The simplest uncoupled meandering DFB structure exhibits Rabi splitting in the transmittance spectrum. The symmetric and antisymmetric coupled meandering waveguide DFB geometries can be utilized as band-pass, Fano, or Lorentzian filters or Rabi splitters. Meandering waveguide DFB elements with a variety of spectral responses can be designed for a variety of lightwave circuit element functions and can be implemented with generality due to the analytic approach taken. Meandering waveguide distributed feedback structures with a variety of spectral responses can be designed for a variety of lightwave circuit element functions.