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:
Sep. 12, 2000
Filed:
Feb. 11, 1998
Jerry Chia-yung Chen, Arlington, MA (US);
Corrado Dragone, Little Silver, NJ (US);
Yuan P Li, Norcoss, GA (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
Optical devices, such as wavelength routers, having a plurality of waveguides of differing lengths, with improved independence to temperature fluctuations. Improved temperature independence is achieved by varying the cross-section of the device waveguides. Cross-section variation can be implemented in one or more of the following ways: selectively applying a temperature-compensating material (e.g., a polymer) over portions of the waveguides, and/or varying the dimensions and/or compositions of the materials used in the waveguides, either along each waveguide or between waveguides or both. By carefully designing the devices, the temperature effects resulting from the different lengths of the different waveguides can be compensated to produce a relatively temperature-independent device. The index of refraction of the temperature-compensating material changes with temperature in the same direction as the indices of refraction of the rest of the waveguide materials, and the effective length of the portion of a waveguide covered by the temperature-compensating material is inversely proportional to the effective length of the waveguide.