Optical fiber, method for manufacturing optical fiber, optical fiber cable, and sensor

Patent metadata

Field	Value
Publication number	US-10830947-B2
Application number	US-201515520280-A
Country	US
Kind code	B2
Filing date	Oct 19, 2015
Priority date	Oct 20, 2014
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

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/cm3 or less, or a size X (μm) of foreign matter contained in the innermost sheath layer and an amount Y of the foreign matter (number/cm3) satisfy formula (1) below: Y≤1200 X e(−0.067×X) (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.

First claim

The invention claimed is:

1. A plastic optical fiber comprising:
a core; and
a sheath having at least one layer,
wherein the plastic optical fiber has 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,
a size X (μm) of foreign matter contained in an innermost layer of the sheath that surrounds an outer periphery of the core and an amount Y of the foreign matter (number/cm 3 ) satisfy Math Formula (1) and Formula (2):
Y≤ 1200 X e (−0.067×X)   (1), and

2≤ X≤ 100  (2).

2. The plastic optical fiber according to claim 1 , wherein the sheath has at least two layers.

3. The plastic optical fiber according to claim 1 ,
wherein the core is singular.

4. The plastic optical fiber according to claim 1 ,
wherein a material constituting the core is an acrylic resin.

5. The plastic optical fiber according to claim 1 ,
wherein the sheath has at least two layers,
a material constituting an innermost sheath layer surrounding an outer periphery of the core is a fluorine-based resin containing a fluoroalkyl (meth)acrylate unit, and
a material constituting an outermost sheath layer is a fluorine-based resin containing a vinylidene fluoride unit.

Assignees

• Mitsubishi Chem Corp

Inventors

• Kihara Hideki
• Tsukamoto Yoshihiro

Classifications

• G02B6/4433 Primary

  Double reinforcement laying in straight line with optical transmission element · CPC title

• C08F220/22

  Esters containing halogen · CPC title

• G02B6/036 Primary

  core or cladding comprising multiple layers {(multicore optical fibres G02B6/02042; microstructured properties G02B6/02295; omniguide fibres G02B6/023)} · CPC title

• C08L27/16

  Homopolymers or copolymers or vinylidene fluoride · CPC title

• C08L33/14

  of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen · CPC title