Methods of altering the resonance of waveguide micro-resonators
AssigneeMassachusetts Institute of Technology
InventorsDesmond R. Lim, Lionel C. Kimerling
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Abstract
Methods of tuning, switching or modulating, or, in general, changing the resonance of waveguide micro-resonators. Changes in the resonance can be brought about, permanently or temporarily, by changing the size of the micro-resonator with precision, by changing the local physical structure of the device or by changing the effective and group indices of refraction of the mode in the micro-resonator. Further changing the asymmetry of the index profile around a waveguide can alter the birefringence of the waveguide and allows one to control the polarization in the waveguide. This change in index profile may be used to change the polarization dependence or birefringence of the resonators.
Claims22
A method of controlling polarization dependent properties of an integrated a waveguide structure:
- providing a high index difference waveguide structure having a core and cladding having an effective index greater than or equal to 0.3;
- changing symmetry of the index of said cladding around the core of the waveguide to alter the cross-sectional symmetry of said waveguide by changing substantially the index on one axis of symmetry of said high index difference waveguide while the index on another axis of symmetry is hardly changed at all or is changed with opposite sign with respect to the index profile in the other axis of symmetry;
- changing birefringence of said cladding or the core of the waveguide to change the cross-sectional symmetry of said wave guide;
- and
- changing absorption of the index of said cladding around the core of the waveguide to alter the polarization dependent loss of said waveguide.
A method of controlling polarization dependent properties of an integrated waveguide resonator comprising:
- providing a high index difference waveguide structure having a core and cladding in a dynamic or permanent manner having an effective index greater than or equal to 0.3;
- changing symmetry of the index of said cladding around the core of the waveguide to alter the cross-sectional symmetry of said waveguide by changing substantially the index on one axis of symmetry of said high index difference waveguide while the index on another axis of symmetry is hardly changed at all or is changed with opposite sign with respect to the index profile in the other axis of symmetry;
- changing birefringence of said cladding or the core of the waveguide to change the cross-sectional symmetry of said wave guide;
- and
- changing absorption of the index of said cladding around the core of the waveguide to alter the polarization dependent loss of said waveguide.
Dependencies are inferred from the claim text.