The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 22, 2013
Filed:
Apr. 13, 2010
Shih-chiang Lin, Dashu Township, Kaohsiung County, TW;
Nai-hsiang Sun, Dashu Township, Kaohsiung County, TW;
Po-jui Chiang, Dashu Township, Kaohsiung County, TW;
Shih-Chiang Lin, Dashu Township, Kaohsiung County, TW;
Nai-Hsiang Sun, Dashu Township, Kaohsiung County, TW;
Po-Jui Chiang, Dashu Township, Kaohsiung County, TW;
I Shou University, Dashu Township, Kaohsiung County, TW;
Abstract
A QPM waveguide includes an optical substrate having periodic domain-inverted regions and non-inverted regions which are arranged alternately, and a waveguide part passing through the domain-inverted regions and non-inverted regions. The substrate is divided into at least two sections each of which has a wave input facet and a wave output facet. At least one band-pass filter layer is disposed on the wave input facet of one section to filter out a signal wave for preventing back conversion so that the energy of the conversion wave can increase. A method for preventing the back conversion is also disclosed.