Optical fiber and method for producing optical fiber
First Claim
1. An optical fiber in which a primary coating layer and a secondary coating layer are formed on an outer circumference of a bare optical fiber including a core and a cladding, whereina Young'"'"'s modulus of the primary coating layer is 0.1 to 1.0 MPa,a relationship between lateral rigidity D and flexural rigidity H of the optical fiber as expressed by formulas below satisfies D/H2≤
- 3×
1017 N−
1 m−
6,the primary coating layer contains 0.3 to 2.0 wt % of a photoinitiator including phosphorus,the primary coating layer contains polypropylene glycol having a weight-average molecular weight of 1000 to 5000, and the formulas include
1 Assignment
0 Petitions
Accused Products
Abstract
Provided is an optical fiber in which a primary coating layer and a secondary coating layer are formed on an outer circumference of a bare optical fiber including a core and a cladding. A Young'"'"'s modulus of the primary coating layer is 0.1 to 1.0 MPa, a relationship between lateral rigidity D and flexural rigidity H of the optical fiber as expressed by formulas below satisfies D/H2≤3×1017 N−1 m−6, the primary coating layer contains 0.3 to 2.0 wt % of a photoinitiator including phosphorus, and the primary coating layer contains polypropylene glycol having a weight-average molecular weight of 1000 to 5000. The formulas include
-
- where r represents a radius (m), E represents a Young'"'"'s modulus (Pa), a subscript g represents glass (the bare optical fiber), a subscript p represents the primary coating layer, and a subscript s represents the secondary coating layer, respectively.
-
Citations
5 Claims
-
1. An optical fiber in which a primary coating layer and a secondary coating layer are formed on an outer circumference of a bare optical fiber including a core and a cladding, wherein
a Young'"'"'s modulus of the primary coating layer is 0.1 to 1.0 MPa, a relationship between lateral rigidity D and flexural rigidity H of the optical fiber as expressed by formulas below satisfies D/H2≤ - 3×
1017 N−
1 m−
6,the primary coating layer contains 0.3 to 2.0 wt % of a photoinitiator including phosphorus, the primary coating layer contains polypropylene glycol having a weight-average molecular weight of 1000 to 5000, and the formulas include - View Dependent Claims (2, 3, 4)
- 3×
-
5. A method for producing an optical fiber in which a primary coating layer and a secondary coating layer are formed on an outer circumference of a bare optical fiber including a core and a cladding, the method comprising:
-
forming the primary coating layer and the secondary coating layer such that a Young'"'"'s modulus of the primary coating layer is 0.1 to 1.0 MPa, and a relationship between lateral rigidity D and flexural rigidity H of the optical fiber as expressed by formulas below satisfies D/H2≤
3×
1017 N−
1 m−
6;containing 0.3 to 2.0 wt % of a photoinitiator including phosphorus in the primary coating layer; and containing polypropylene glycol having a weight-average molecular weight of 1000 to 5000 in the primary coating layer, wherein the formulas include
-
Specification