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AssigneeSumitomo Electric Industries, Ltd.
InventorsKen Hashimoto, Akira Inoue, Masaki Ohmura
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The present invention relates to a method of making a diffraction grating device, in which an optical waveguide is irradiated, by way of a phase grating, with light capable of inducing a refractive index modulation in an optical waveguide region of the optical waveguide so as to form a diffraction grating in the optical waveguide region. In the present invention, when modulating the refractive index of the optical waveguide region of an optical fiber, the intensity of refractive index modulation inducing light emitted from a laser light source so as to irradiate the phase grating is adjusted according to individual positions on the phase grating. Alternatively, the scanning speed of a mirror scanned by a stage is adjusted according to the individual positions on the phase grating. Here, the amount of irradiation of refractive index modulation inducing light at each position on the phase grating is adjusted so as to cancel the diffraction efficiency distribution of phase grating. The present invention can make a diffraction grating device having a desirable characteristic even when the diffraction efficiency distribution of phase grating deviates from its desirable distribution.
A method of making a diffraction grating device, in which an optical waveguide is irradiated, by way of a phase grating, with refractive index modulation inducing light capable of inducing a refractive index modulation in an optical waveguide region of said optical waveguide so as to form a diffraction grating in said optical waveguide region, said method comprising:
An apparatus for making a diffraction grating device, in which an optical waveguide is irradiated, by way of a phase grating, with refractive index modulation inducing light capable of inducing a refractive index modulation in an optical waveguide region of said optical waveguide so as to form a diffraction grating in said optical waveguide region, said apparatus comprising:
An apparatus for making a diffraction grating device, in which a diffraction grating is made in an optical waveguide region of an optical waveguide, said apparatus comprising:
An apparatus for making a diffraction grating device, in which a diffraction grating is made in an optical waveguide region of an optical waveguide, said apparatus comprising:
Dependencies are inferred from the claim text.