Reconfigurable multiport switch in coupled mode devices

Abstract

We consider a coupled mode system where the effective propagation constants of localized modes are amenable to modulation. Starting from an unmodulated system where power transfer is heavily suppressed, we demonstrate that small, periodic modulation of the propagation constants enhance power transfer using a slowly varying envelope approximation for the field mode amplitudes. We calculate an approximate modulation frequency enabling complete transfer between otherwise negligibly coupled elements. The ability to control these modulations by electrical or thermal effects allows for reconfigurable multiport switching. We use an array of coupled silica waveguides and the thermo-optic effect to test our predictions in the telecom C-band. However, this requires a refractive index modulation with period of the order $10^{-3}\mathrm{m}$ and yields total power transfer with a propagation distance of the order of $10^{-1}\mathrm{m}$, which might make it unattractive for integrated photonic applications. Nevertheless, our results are valid for devices described by an equivalent coupled mode matrix for space or time propagation; for example, arrays of microring or terahertz resonators, microwave cavities, radio frequency antennas, or RLC circuits.

arXiv comment15 pages, 4 figures

References in corpus (16)

• Universal Linear Optics
• Multidimensional quantum entanglement with large-scale integrated optics
• Physical realization of $\mathcal{P}\mathcal{T}$-symmetric potential scattering in a planar slab waveguide
• Manipulating multi-photon entanglement in waveguide quantum circuits
• Coherent tunneling by adiabatic passage in an optical waveguide system
• Coherent Quantum Transport in Photonic Lattices
• Energy Coupled Mode Theory for an arbitrary number of resonators
• Symmetry in optics and photonics: a group theory approach
• Ermakov-Lewis symmetry in photonic lattices
• Revisiting the optical $PT$-symmetric dimer
• Gilmore-Perelomov symmetry based approach to photonic lattices
• Optical finite representation of the Lorentz group
• Propagation and perfect transmission in three-waveguide axially varying couplers
• Necklaces of $\mathcal{P}\mathcal{T}$-symmetric dimers
• Optimal crosstalk suppression in multicore fibers
• Optical non-Hermitian para-Fermi oscillators