US 7,496,254 B2
Curved optical waveguide and optical device
Nobuo Miyadera, Ibaraki (Japan); and Rei Yamamoto, Ibaraki (Japan)
Assigned to Hitachi Chemical Company, Ltd., Tokyo (Japan)
Appl. No. 10/587,170
PCT Filed Jan. 20, 2005, PCT No. PCT/JP2005/000703
§ 371(c)(1), (2), (4) Date Jul. 25, 2006,
PCT Pub. No. WO2005/071454, PCT Pub. Date Aug. 04, 2005.
Claims priority of application No. 2004-016536 (JP), filed on Jan. 26, 2004; and application No. 2004-016537 (JP), filed on Jan. 26, 2004.
Prior Publication US 2007/0154141 A1, Jul. 05, 2007
Int. Cl. G02B 6/26 (2006.01); G02B 6/28 (2006.01)
U.S. Cl. 385—32  [385/24; 385/45; 385/48] 23 Claims
OG exemplary drawing
 
1. A curved optical waveguide comprising:
a core; and
a clad,
wherein a core shape of the curved optical waveguide is defined by the following equation [IV]:
y=1−cos [(π/2)z]  [IV]
wherein y and z represent coordinate axes perpendicular to each other on a plane where the optical waveguide is present.