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. 06, 2005
Filed:
Jul. 02, 2002
Michael Fokine, Bandhagen, SE;
Lars-erik Nilsson, Arsta, SE;
Åsa Claesson, Stockholm, SE;
Walter Margulis, Huddinge, SE;
Leif Kjellberg, Stockholm, SE;
Hania Arsalane, Saint Ouen du Tilleul, FR;
Pedro Torres, Rio De Janeiro, BE;
Michael Fokine, Bandhagen, SE;
Lars-Erik Nilsson, Arsta, SE;
Åsa Claesson, Stockholm, SE;
Walter Margulis, Huddinge, SE;
Leif Kjellberg, Stockholm, SE;
Hania Arsalane, Saint Ouen du Tilleul, FR;
Pedro Torres, Rio De Janeiro, BE;
Acreo AB, Kista, SE;
Abstract
The invention relates to a method and a device for controlling the refractive index in the core of an optical fiber. According to the invention, an optical fiber is provided with a longitudinal electrode running along the core of the fiber. An electric current is passed through the electrode to induce ohmic heating thereof, causing thermal expansion and consequently a compressing force upon the core of the fiber. This compression of the core leads to induced changes in the refractive index in the direction of the compressing force, and hence induces or alters birefringence in the core.