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:
May. 07, 2002
Filed:
Apr. 19, 2000
Yawen Yang, San Jose, CA (US);
Tera Fiberoptics, Inc., Sunnyvale, CA (US);
Abstract
Method for producing a stable, multi-port fiber optic coupler that is useful for wavelength division multiplexing (WDM). The system response is substantially independent of signal polarization and is reasonably stable against mechanical stresses and elevated temperatures. Contiguous sections of two or more fiber optic lines are alternatingly heated and elongated and are twisted according to selected process parameters for selected time intervals. The fabrication procedure uses a combination of fiber heating at two or more distinct temperatures, fiber elongation and fiber twisting, applied to two or more contiguous fiber optic lines, to produce a fused fiber optic coupler with controllable wavelength discrimination and controllable signal power coupling into each output branch of the fiber optic coupler. ITU standards for wavelength discrimination and wavelength centering in a fiber optic coupler can be met by adjustment of the process parameters.