US 8,619,216 B1 · Optical wavelength filter

Abstract

An optical wavelength selective device includes a waveguide grating unit to separate input beam signals with different wavelengths into a plurality of output beam signals, each of which has a different wavelength span and is output from a different channel region of the waveguide grating unit; a polarization splitting unit to split each of the output beam signals into a first polarized beam with a first polarization and a second polarized beam with a second polarization different from the first polarization; a birefringence control member to control the first polarized beam to undergo a different refractive effect than the second polarized beam when the first and second polarized beams pass through the birefringence control member under a first voltage applied thereto; and a reflection member configured to reflect the first and second polarized beams output from the birefringence control member back to the birefringence control member.

Claims20

Dependent claims

An optical wavelength selective device comprising:

a waveguide grating unit which separates input beam signals with different wavelengths into a plurality of output beam signals, each of which has a different wavelength span and is output from a different channel region of the waveguide grating unit;
a polarization splitting unit which splits each of the plurality of output beam signals output from the waveguide grating unit into a first polarized beam with a first polarization and a second polarized beam with a second polarization different from the first polarization;
a birefringence control member which controls each of the first polarized beam with the first polarization to undergo a different refractive effect than the second polarized beam with the second polarization when the first and second polarized beams pass through the birefringence control member under a first voltage applied thereto;
and
a reflection member which reflects the first and second polarized beams output from the birefringence control member back to the birefringence control member.

2 more elements

A method of selecting a light beam signal having a desired wavelength span out of light beam signals having various wavelengths, comprising:

separating input beam signals with different wavelengths into a plurality of output beam signals using a waveguide grating unit, each of the plurality of output beam signals having a different wavelength span and is output from a different channel region of the waveguide grating unit;
splitting, by a polarization splitting unit, the plurality of output beam signals output from the waveguide grating unit into a first polarized beam with a first polarization and a second polarized beam with a second polarization different from the first polarization;
controlling, by a birefringence control member, the first polarized beam with the first polarization to undergo a different refractive effect than the second polarized beam with the second polarization when the first and second polarized beams pass through the birefringence control member under a first voltage applied thereto;
and
reflecting the first and second polarized beams output from the birefringence control member back to the birefringence control member using a reflection member.

2 more elements

Dependencies are inferred from the claim text.

Optical wavelength filter

Life of this patent

Optical wavelength filter

Life of this patent

Abstract

Claims20