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, 1996
Filed:
Dec. 22, 1994
Applicant:
Inventor:
Julian Stone, Monmouth, NJ (US);
Assignee:
AT&T Corp., Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
385 24 ; 385 14 ; 385 37 ; 385 40 ; 385 46 ;
Abstract
An apparatus is provided that allows the tunability of a waveguide bench router with a silicon-based material. This is accomplished by adding a triangular shaped layer of hydrogenated amorphous silicon (a-Si:H) as an active region across the waveguide. By varying a current across the triangle, the refractive index of the layer will change causing a change to the delay of the signal going across the material. Thus eliminated are the need for Group III-V elements or Lithium Niobate as the tunable element, increasing the coupling efficiency and decreasing cost.