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Electronically reconfigurable superimposed waveguide long-period gratings
Mykola Kulishov1, Xavier Daxhelet, Mounir Gaidi
1Adtek Photomask, Inc., Montréal, Québec, Canada. mkulishov@adtekphotomask.com
Summary
This study analyzes electro-optically induced refractive index gratings in waveguides. The research demonstrates independent electronic control over dual-dip transmission spectra for tunable integrated optics devices.
Area of Science:
- Integrated Optics
- Electro-Optics
- Waveguide Theory
Background:
- Waveguides with electro-optically active cores are crucial for integrated optics.
- Periodic electric fields can induce refractive index perturbations.
Purpose of the Study:
- To analyze refractive index perturbations in an electro-optic waveguide induced by interdigitated electrodes.
- To investigate the interaction between guided modes and induced gratings.
- To explore the potential for tunable integrated optical devices.
Main Methods:
- Analysis of electric field-induced refractive index gratings.
- Modeling of superimposed gratings with different symmetries and periodicities.
- Solution of coupled-wave equations.
- Numerical simulation of spectral characteristics.
Main Results:
- Two superimposed refractive index gratings are induced, one with constant and variable components, the other with only a variable component.
- These gratings enable controlled interaction between core and cladding modes.
- Spectral characteristics exhibit a dual-dip transmission spectrum with electronically tunable dips.
- A novel potential application scheme allows selective mode coupling.
Conclusions:
- The proposed waveguide design allows independent electronic control over dual-dip transmission spectra.
- This offers a new building block for developing tunable integrated optical devices.
- The method provides selective coupling between core and cladding modes, preventing inter-cladding mode interaction.