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1. (WO2003007032) OPTICAL WAVEGUIDE DIFFRACTION GRATING DEVICE AND ITS FABRICATION METHOD

Pub. No.:    WO/2003/007032    International Application No.:    PCT/JP2002/006868
Publication Date: Fri Jan 24 00:59:59 CET 2003 International Filing Date: Sat Jul 06 01:59:59 CEST 2002
IPC: G02B 6/00
G02B 6/10
G02B 6/34
H01S 3/00
Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventors: OHMURA, Masaki

SHIGEHARA, Masakazu

Title: OPTICAL WAVEGUIDE DIFFRACTION GRATING DEVICE AND ITS FABRICATION METHOD
Abstract:
A waveguide diffraction grating device (gradient diffraction grating device) comprises modulated refraction index sections (13n). If the refraction index level surface where the refraction index is equal is designated by Ln, the line perpendicular to the refraction index level surface Ln and crossing the optical axis (x-axis) of an optical fiber (10) is designated by An, the angle between the line An and the optical axis is designated by θn, and the plane of angle of deviation formed by the line An and the optical axis is designated by Mn (n=1 to N); in each modulated refraction index section (13n), the line An is not parallel to the optical axis, the angle θn between the line An and optical axis is not zero, and the planes of angle of deviation Mn of each modulated refractive index section (13n) do not agree with one another. The forming regions where any two modulated refractive index sections (13n1, 13n2) among the modulated refractive index sections (131 to 13N) at least overlap with each other. A method for fabricating the waveguide diffraction grating device (gradient diffraction grating device) is also disclosed.