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:
Nov. 10, 2020
Filed:
Oct. 19, 2015
Mitsubishi Chemical Corporation, Tokyo, JP;
Hideki Kihara, Tokyo, JP;
Yoshihiro Tsukamoto, Tokyo, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
The present invention provides a plastic optical fiber comprising a core and a sheath consisting of at least one layer, the plastic optical fiber having a transmission loss of 120 dB/km or less as measured by a 25 m-1 m cutback method under conditions of a wavelength of 525 nm and an excitation of NA=0.45, and satisfying either one of the following conditions when a thickness of the innermost sheath layer is 0.5 μm to 4.5 μm, an amount of foreign matter having a size of 2 μm or greater contained in the innermost sheath layer is 2000/cmor less, or a size X (μm) of foreign matter contained in the innermost sheath layer and an amount Y of the foreign matter (number/cm) satisfy formula (1) below: Y≤1200 X e(1). Such optical fibers have a low transmission loss of green light (in particular, light having a wavelength of 525 nm), enabling longer distance communication.