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US 5,351,317 AGranted
Interferometric tunable optical filter
AssigneeTelefonaktiebolaget L M Ericsson
InventorJean-Pierre Weber
Life of this patent
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Abstract
An interferometric tunable optical filter selects a predetermined wavelength or wavelengths from a wavelength division multiplexed signal. The optical filter splits an input signal into a plurality of waveguide branches. In each branch, the amplitude and phase of the signal can be individually controlled. The signals are then recombined. The resulting interference gives a wavelength dependent transmission spectrum that can be adjusted as desired.
Claims15
An interferometric tunable optical filter comprising:
- a semiconductor substrate having a first electrode provided on a first surface thereof;
- a waveguide formed in and laterally defined within the surface of said substrate for carrying lightwaves, wherein a section of said waveguide is split into more than two parallel branches, each branch having a different length, wherein each branch of said waveguide contains a phase control means for changing the effective index of waveguide;
- means for splitting said lightwaves into said branches of said waveguide;
- and
- means for recombining said lightwaves after said split section of said waveguide.
2 more elements
Dependencies are inferred from the claim text.