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:
Mar. 24, 1998
Filed:
May. 15, 1996
Applicant:
Inventor:
Kevin Christopher Byron, Bishop's Stortford, GB;
Assignee:
Northern Telecom Limited, Montreal, CA;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ; B44C / ;
U.S. Cl.
CPC ...
216 24 ; 216 66 ; 430-5 ; 359569 ;
Abstract
A phase grating mask is placed in-contact or near contact with an optical waveguide to make a blazed grating in the waveguide. A band of grating elements are defined across a surface of the mask such that in the plane of the surface each element is formed at a predetermined blaze angle to a central longitudinal axis of the band. The grating is made by aligning the waveguide with the axis of the band and irradiating the phase mask. Gratings may be formed in a single step, or in several steps by moving the mask relative to the waveguide after each irradiation. The mask may be formed on a substrate by electron beam lithography.