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:
Apr. 08, 2014
Filed:
Jun. 08, 2011
Masanobu Nakamura, Tokyo, JP;
Yoshihiro Arashitani, Tokyo, JP;
Masanobu Nakamura, Tokyo, JP;
Yoshihiro Arashitani, Tokyo, JP;
Furukawa Electric Co., Ltd., Tokyo, JP;
Abstract
The present invention provides an optical fiber which can have a larger NA and a preferable mechanical strength even with a monolayer coating and can be fabricated at low cost, and which can transmit excitation light efficiently reducing a loss even under a high temperature environment during the operation of a fiber laser. An optical fiber according to an embodiment of the present invention includes a core, a glass cladding which is provided at a periphery of the core and has a refractive index smaller than the core, and a polymer cladding which is provided at a periphery of the glass cladding and has a refractive index smaller than the glass cladding. The polymer cladding contains fluorine and the polymer cladding has a difference between an elasticity modulus at 60° C. and that at 23° C. equal to or smaller than 100 MPa and also has an elasticity modulus equal to or larger than 200 MPa at 23° C.