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. 09, 2008
Filed:
Oct. 10, 2007
Ryuichiro Goto, Sakura, JP;
Shoichiro Matsuo, Sakura, JP;
Kuniharu Himeno, Sakura, JP;
Fujikura Ltd., Tokyo, JP;
Abstract
In a method of measurement of the birefringence of an optical fiber, the round-trip Jones matrix R(z) for a first interval (, z) from a measurement starting pointin the optical fiber for measurement to a prescribed position z, and the round-trip Jones matrix R(z+Δz) for a second interval (, z+Δz) from the measurement starting pointto a position z+Δz differing from the position z, are acquired, the eigenvalues ρ, ρof the matrix R(z+Δz)R(z)are determined, and by computing the following equations (1) and (2), (where φ represents the phase difference between linear polarization components due to birefringence, Δn represents birefringence, and λ represents wavelength), the birefringence in the infinitesimal interval Δz from the position z to the position z+Δz is obtained.