| US 7,580,597 B2 | ||
| Optical functional circuit | ||
| Tsutomu Kitoh, Atsugi (Japan); Yohei Sakamaki, Atsugi (Japan); Toshikazu Hashimoto, Yamato (Japan); Takashi Saida, Sagamihara (Japan); Hiroshi Takahashi, Atsugi (Japan); Masahiro Yanagisawa, Mito (Japan); Ikuo Ogawa, Atsugi (Japan); Tomohiro Shibata, Tokyo (Japan); and Senichi Suzuki, Mito (Japan) | ||
| Assigned to Nippon Telegraph and Telephone Corporation, Tokyo (Japan) | ||
| Appl. No. 10/584,820 PCT Filed Jul. 01, 2005, PCT No. PCT/JP2005/012186 § 371(c)(1), (2), (4) Date Jan. 24, 2008, PCT Pub. No. WO2006/004031, PCT Pub. Date Jan. 12, 2006. |
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| Claims priority of application No. 2004-197313 (JP), filed on Jul. 02, 2004; and application No. 2004-317092 (JP), filed on Oct. 29, 2004. | ||
| Prior Publication US 2008/0232736 A1, Sep. 25, 2008 | ||
| Int. Cl. G02B 6/12 (2006.01) | ||
| U.S. Cl. 385—14 [385/39; 385/49] | 12 Claims |
| 1. An optical functional circuit in which a plurality of circuit elements are formed on a substrate, comprising:
a wave propagation medium for converting an optical path of a leakage light that is not emitted from a predetermined output
port of the circuit element so as to prevent the leakage light from being coupled to a different circuit element,
wherein the wave propagation medium comprises an optical waveguide, which is provided with a clad layer formed on the substrate
and a core embedded in the clad layer, and the wave propagation medium has a spatial refractive index distribution for outputting
the leakage light launched into the circuit element to other port as output-light with multiple scattering through the wave
propagation medium,
said spatial refractive index distribution is designated by each refractive index of pixels defined by a mesh, said each refractive
index of the pixels is determined by calculating a phase difference between a forward propagation of the input field of the
leakage light and a reverse propagation of the output field of the output-light at each pixel and repeating calculations until
said phase difference becomes less than a desired value.
|