Fiber optic

• US 8,116,606 B2
• Filed: 02/07/2008
• Issued: 02/14/2012
• Est. Priority Date: 02/13/2007
• Status: Active Grant

• Current Assignee: Hamamatsu Photonics KK
• Original Assignee: Hamamatsu Photonics KK
• Inventors: Sugawara, Takeo, Tominaga, Akira
• Primary Examiner(s): Healy, Brian
• Application Number:
  US12/524,977
• Publication Number:
  US 20100104248A1
• Time in Patent Office: 1,468 Days
• Field of Search: 385/120, 385/144, 385/115, 385/116, 385/141, 385/123, 385/96, 385/97, 385/99, 501/78, 501/64, 501/73, 653/85, 654/06, 654/08, 654/11
• US Class Current: 385/120
• CPC Class Codes: C03C 13/046 Multicomponent glass compositions
• CPC Class Codes: C03C 3/091 containing aluminium
• CPC Class Codes: C03C 4/08 for glass selectively absorbing radiation of specified wave lengths
• CPC Class Codes: G02B 6/0008 the light being emitted at the end of the fibre
• CPC Class Codes: G02B 6/03694 Multiple layers differing in properties other than the refractive index, e.g. attenuation, diffusion, stress properties
• CPC Class Codes: G02B 6/06 the relative position of the fibres being the same at both ends, e.g. for transporting images

Abstract

A fiber optic includes a plurality of fibers each including a core made of core glass for propagating light and a cladding for covering an outer periphery of the core and made of cladding glass lower in refractive index than the core glass and an absorber glass arranged between the plurality of fibers and for absorbing light leaking from the plurality of fibers. The plurality of fibers are bundled and integrated. The absorber glass contains Fe₃O₄ being iron oxide crystals.

Claims

1. A fiber optic comprising:

a plurality of fibers each including a core made of core glass for propagating light and a cladding for covering an outer periphery of the core and made of cladding glass lower in refractive index than the core glass; and

an absorber glass arranged between the plurality of fibers and for absorbing light leaking from the plurality of fibers, wherein

the plurality of fibers are bundled and integrated,

the absorber glass contains Fe₃O₄ being iron oxide crystals, and

wherein the absorber glass contains Fe₃O₄ being iron oxide crystals of more than 18% and less than 30% in percent by mass.

2. The fiber optic according to claim 1, wherein the absorber glass is arranged between the plurality of fibers and covers outer peripheries of the plurality of fibers.

3. The fiber optic according to claim 1, comprising a plurality of absorber glasses, wherein the cladding is arranged between the plurality of absorber glasses and covers outer peripheries of the plurality of absorber glasses.

4. The fiber optic according to claim 1, wherein Fe₃O₄ being iron oxide crystals of the absorber glass is granularly precipitated in the absorber glass.

5. The fiber optic according to claim 4, wherein the absorber glass further contains Al₂O₃.

6. The fiber optic according to claim 5, wherein the absorber glass contains Al₂O₃ of less than 7% in percent by mass.

7. A fiber optic formed by drawing while heat-fusing a plurality of single fibers and a plurality of absorber glasses, the plurality of single fibers comprising core glass covered with cladding glass, the plurality of absorber glasses containing Fe₃O₄ being iron oxide crystals precipitated through a heat treatment, and

wherein the plurality of absorber glasses contain Fe₃O₄ being iron oxide crystals of more than 18% and less than 30% in percent by mass.

8. A fiber optic formed by drawing while heat-fusing a plurality of single fibers and a plurality of first absorber glasses, the plurality of single fibers comprising core glass covered with cladding glass, the plurality of first absorber glasses containing Fe₂O₃, wherein

a plurality of second absorber glasses formed of the plurality of first absorber glasses contain Fe₃O₄ being iron oxide crystals precipitated by heat at the time of heat fusing, and

wherein the plurality of second absorber glasses contain Fe₃O₄ being iron oxide crystals of more than 18% and less than 30% in percent by mass.