Patent ID: 6466705
Filing Date: 2002-10-15
Classification: G02B,G02F

Abstract:
An acousto-optic variable-wavelength TE/TM mode converter, comprising:an optical waveguide arranged in a piezoelectric substrate; first and second comb electrodes generating surface acoustic waves in the piezoelectric substrate; a coupled acoustic waveguide, which is composed of first and second acoustic waveguides where at least partial areas in propagation directions of the surface acoustic waves are separated by a gap between the acoustic waveguides, for guiding the surface acoustic waves propagating in the piezoelectric substrate; and first and second surface acoustic wave absorbers absorbing the surface acoustic waves, wherein said first and second comb electrodes are arranged within the first acoustic waveguide, and said optical waveguide is arranged within the second acoustic waveguide, and said first and second surface acoustic wave absorbers are respectively arranged at positions which are interposed between said first and second comb electrodes, and are different in correspondence with said first and second comb electrodes respectively.