| US 7,529,455 B2 | ||
| Optical integrated device and optical control device | ||
| Shuichi Suzuki, Kanagawa (Japan); and Atsushi Sakai, Kanagawa (Japan) | ||
| Assigned to Ricoh Company, Ltd., Tokyo (Japan) | ||
| Filed on Aug. 09, 2006, as Appl. No. 11/501,050. | ||
| Claims priority of application No. 2005-233491 (JP), filed on Aug. 11, 2005; and application No. 2006-122176 (JP), filed on Apr. 26, 2006. | ||
| Prior Publication US 2007/0036500 A1, Feb. 15, 2007 | ||
| Int. Cl. G02B 6/10 (2006.01); G02B 6/255 (2006.01) | ||
| U.S. Cl. 385—129 [385/95] | 13 Claims |
| 1. An optical integrated device having a plurality of optical waveguides connected on a same substrate and each including
a core and a cladding,
wherein two adjacent optical waveguides are different in a refractive index difference between the core and the cladding;
wherein the cores of the two adjacent optical waveguides have a same refractive index;
wherein a first one of the two adjacent optical waveguides has a greater relative index difference than a second one of the
two adjacent optical waveguides; and
wherein the first one of the two adjacent optical waveguides has a curved part having a smaller radius of curvature than the
second one of the two adjacent optical waveguides.
|