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. 29, 1992
Filed:
May. 02, 1991
Franklin W Dabby, Los Angeles, CA (US);
Ensign-Bickford Optical Technologies, Inc., Van Nuys, CA (US);
Abstract
An optical waveguide that has low (0.16 to 0.28 db/km) attenuation but can be subjected to sharp radii of curvature of the order of 2 mm has an index of refraction difference between core and cladding of less than 0.75% and a cutoff wavelength that is 50 micrometers or more greater than the operating wavelength. The waveguide is a 'virtual single mode' device, because even though a second order mode can be sustained in the waveguide, the waveguide length or bending losses, or both, differentially attenuates the second order mode so that the primary mode strongly predominates and both modal noise and attenuation are within acceptable limits.