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:
Dec. 24, 2002
Filed:
Sep. 07, 2000
Applicant:
Inventor:
Tetsuji Ueda, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 6/26 ;
U.S. Cl.
CPC ...
G02B 6/26 ;
Abstract
An arrayed waveguide grating for multiplexing or demultiplexing WDM optical signals is fabricated by forming an input waveguide, an input slab waveguide, arrayed waveguides, an output slab waveguide and output waveguides on a circuit substrate, and integrated with a thin film heater. Since the arrayed waveguide grating does not necessitate an independent component for controlling temperature, such as a thin heater or Peltier, and the structure thereof is simplified and unified.