| US 7,580,336 B2 | ||
| Optical head having a beam input/output coupler on a planar waveguide | ||
| Dong Woo Suh, Daejeon (Korea, Republic of); Yong Woo Park, Daejeon (Korea, Republic of); Mun Cheol Paek, Daejeon (Korea, Republic of); Ho Jun Ryu, Seoul (Korea, Republic of); Hee Sook Chung, Daejeon (Korea, Republic of); and Kwang Yong Kang, Daejeon (Korea, Republic of) | ||
| Assigned to Electronics and Telecommunications Research Institute, Daejeon (Korea, Republic of) | ||
| Filed on Nov. 10, 2005, as Appl. No. 11/270,998. | ||
| Claims priority of application No. 10-2004-0103073 (KR), filed on Dec. 08, 2004; and application No. 10-2005-0053053 (KR), filed on Jun. 20, 2005. | ||
| Prior Publication US 2006/0120249 A1, Jun. 08, 2006 | ||
| Int. Cl. G11B 7/135 (2006.01) | ||
| U.S. Cl. 369—112.27 [369/112.01] | 20 Claims |
| 1. An optical head comprising:
a light transmitting element emitting a beam of light;
a planar waveguide formed on a substrate and receiving the beam emitted from the light transmitting element;
a beam input/output coupler having a plurality of thin films formed on a portion of the planar waveguide and stacked on each
other,
an optical disc formed on or above the beam input/output coupler,
wherein the beam input/output coupler receives the beam from the planar waveguide and transmits the beam at an angle toward
the disc, and
wherein the beam input/output coupler receives the beam reflected from the disc and transmits the reflected beam into the
planar waveguide; and
wherein the plurality of thin films includes a leaky mode directional coupler emitting the beam propagating in the planar
waveguide upward and allowing the beam reflected from the disc to be incident on the planar waveguide, and a beam splitter
separating the beam emitted upward by the leaky mode directional coupler and the beam reflected from the disk.
a light receiving element receiving the reflected beam transmitted into the planar waveguide through the beam input/output
coupler.
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