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:
Nov. 30, 2010
Filed:
May. 13, 2009
Hiroyuki Yamazaki, Tokyo, JP;
Hiroyuki Yamazaki, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
To prevent the property of an optical filter from being changed even if there is a change in a gap of directional couplers generated due to variations in manufacturing conditions so as to improve the yield. A tunable laser device includes a PLC and an SOA. The PLC includes: optical waveguides; an optical filter; a loop mirror; thin-film heaters; and asymmetrical MZIs. Optical coupling parts within the PLC are formed with the asymmetrical MZIs, so that there is no change generated in the property of the optical filter even if there is a change generated in a gap of the directional couplers due to variations in the manufacturing conditions. Therefore, the yield can be improved.