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:
Aug. 02, 2005
Filed:
May. 30, 2003
Edward John Laskowski, Short Hills, NJ (US);
Christi Kay Madsen, South Plainfield, NJ (US);
Annjoe Golangco Wong-foy, Basking Ridge, NJ (US);
Edward John Laskowski, Short Hills, NJ (US);
Christi Kay Madsen, South Plainfield, NJ (US);
Annjoe Golangco Wong-Foy, Basking Ridge, NJ (US);
Lucent Technologies, Inc., Murray Hill, NJ (US);
Abstract
In accordance with the invention, a high speed thermo-optic phase shifter comprises a length of optical waveguide including a waveguiding core of a first material having an index of refraction nand a first order temperature dependence |dn/dT| and, optically coupled to the core, a length of a second material having an index npreferably greater than the core (n>n) and a first order temperature dependence |dn/dT| than the core (|dn/dT|>|dn/dT|). Advantageously, the length of second material is adiabatically tapered at both ends. Upon heating, as by a resistance heater, the second material changes the optical pathlength by an amount predominantly determined by |dn/dT| providing faster switching speed. In a preferred embodiment, the core comprises silica, and the second material comprises silicon to produce switching speeds up to a few hundred MHz.