Optical wavelength tunable filter

Details Optical wavelength tunable filter Optical wavelength tunable filter

2005-11-28

2008-03-04

Pak, Sung (Department: 2874)

Optical waveguides

Directional optical modulation within an optical waveguide

Acousto-optic

Reexamination Certificate

active

07340115

ABSTRACT:
In an optical wavelength tunable filter (AOTF) using an acousto-optic effect of the present invention, there is provided a single SAW waveguide which propagates a surface acoustic wave generated by an IDT along respective arm portions of an optical waveguide. The SAW waveguide is formed with a pair of low sound-velocity areas having a curved belt shape, in which a mode distribution of a propagating SAW is changed symmetrically with respect to a straight line as an axis passing through the middle of the respective arm portions, while keeping the sound velocity of the SAW constant. As a result, wavelength dependence and polarization dependence of the filter property, and an increase in sidelobe level, generated due to weighting of the SAW intensity, can be suppressed.

REFERENCES:
patent: 6400881 (2002-06-01), Seino et al.
patent: 8-211349 (1996-08-01), None
patent: 2004-219589 (2004-08-01), None

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