Optical connector which provides a disconnection state between two optical fibers where light is totally reflected at an end face of one fiber

• US 6,048,102 A
• Filed: 04/11/1996
• Issued: 04/11/2000
• Est. Priority Date: 11/20/1995
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Fukushima, Nobuhiro
• Primary Examiner(s): Lee, John D.
• Application Number:
  US08/632,361
• Time in Patent Office: 1,461 Days
• Field of Search: 385/70-73, 385/76-78, 385/58, 385/60, 385/66, 385/140
• US Class Current: 385/72
• CPC Class Codes: G02B 6/3821 with axial spring biasing or loading means G02B6/3847 takes precedence
• CPC Class Codes: G02B 6/3822 with beveled fibre ends
• CPC Class Codes: G02B 6/3825 with an intermediate part, e.g. adapter, receptacle, linking two plugs
• CPC Class Codes: G02B 6/3846 with fibre stubs
• CPC Class Codes: G02B 6/3863 fabricated by using polishing techniques grinding of the fibre ends B24B19/226
• CPC Class Codes: G02B 6/3869 Mounting ferrules to connector body, i.e. plugs
• CPC Class Codes: G02B 6/3875 Floatingly supported sleeves
• CPC Class Codes: G02B 6/3885 Multicore or multichannel optical connectors, i.e. one single ferrule containing more than one fibre, e.g. ribbon type optical ribbon cable G02B6/4403, G02B6/448
• CPC Class Codes: G02B 6/3894 Screw-lock type

Abstract

An optical connector including first and second optical fibers which each has a slanted end face. The optical connector provides a connection state where the end face of the first optical fiber is aligned with, and in close contact with, the end face of the second optical fiber so that light travelling through the first optical fiber travels into the second optical fiber. Moreover, the optical connector provides a disconnection state where a gap exists between the end face of the first optical fiber and the end face of the second optical fiber. The end face of the first optical fiber causes light travelling through the first optical fiber to be totally reflected at the end face of the first optical fiber when in the disconnection state.

Claims

1. An optical connector comprising:

first and second optical fibers which each has a slanted end face, wherein

the optical connector provides a connection state where the end face of the first optical fiber is aligned with, and in close contact with, the end face of the second optical fiber so that light travelling through the first optical fiber travels into the second optical fiber,

the optical connector provides a disconnection state where a gap exists between the end face of the first optical fiber and the end face of the second optical fiber, the end face of the first optical fiber causing light travelling through the first optical fiber to experience total internal reflection at the end face of the first optical fiber when in the disconnection state,

the first optical fiber has a core with a refractive index equal to or below 1.6, and light travels through the core in a travelling direction, and

a normal passing through the end face of the first optical fiber forms an approximately 42°

angle with respect to the travelling direction of light through the core.

2. An optical connector comprising:

a first optical fiber having a core through which light travels in a travelling direction, the first optical fiber having an end face which is slanted so that a normal passing through the end face forms an angle θ

with respect to the travelling direction of light through the core with sin θ

≧

1/n, where n is a refractive index of the core;

a second optical fiber having an end face; and

a connection mechanism which provides

a connection state where the end face of the first optical fiber is in close contact with the end face of the second optical fiber so that light travelling through the first optical fiber travels into the second optical fiber, and

a disconnection state where an air gap exists between the end face of the first optical fiber and the end face of the second optical fiber, the end face of the first optical fiber thereby causing light travelling through the first optical fiber to experience total internal reflection at the end face of the first optical fiber when in the disconnection state,

wherein, when in the disconnection state, light experiencing total internal reflection at the end face of the first optical fiber is incident on a portion of the first optical fiber, said portion being a light absorbing part which absorbs the incident light.

3. An optical connector comprising:

first and second optical fibers which each has a slanted end face, wherein

the optical connector provides a connection state where the end face of the first optical fiber is aligned with, and in close contact with, the end face of the second optical fiber so that light travelling through the first optical fiber travels into the second optical fiber,

the optical connector provides a disconnection state where a gap exists between the end face of the first optical fiber and the end face of the second optical fiber, the end face of the first optical fiber causing light travelling through the first optical fiber to experience total internal reflection at the end face of the first optical fiber when in the disconnection state, and, in the disconnection state, the gap is of uniform width between the end faces of the first and second optical fibers.

4. An optical connector comprising:

first and second optical fibers which each has a slanted end face, wherein

the optical connector provides a connection state where the end face of the first optical fiber is aligned with, and in close contact with, the end face of the second optical fiber so that light travelling through the first optical fiber travels into the second optical fiber, and

the optical connector provides a disconnection state where a gap exists between the end face of the first optical fiber and the end face of the second optical fiber, the end face of the first optical fiber causing light travelling through the first optical fiber to experience total internal reflection at the end face of the first optical fiber when in the disconnection state;

a housing device which houses the end faces of the first and second optical fibers so that, in the connection state, the end faces are enclosed by the housing device and, in the disconnection state, the end faces and the gap are enclosed by the housing device, wherein, in the disconnection state, the gap is of uniform width between the end faces of the first and second optical fibers.

5. An optical connector comprising:

a first optical fiber having a core through which light travels in a travelling direction, the first optical fiber having an end face which is slanted so that a normal passing through the end face forms an angle θ

with respect to the travelling direction of light through the core with sin θ

≧

1/n, where n is a refractive index of the core;

a second optical fiber having an end face, and

a connection mechanism which provides

a connection state where the end face of the first optical fiber is in close contact with the end face of the second optical fiber so that light travelling through the first optical fiber travels into the second optical fiber, and

a disconnection state where an air gap exists between the end face of the first optical fiber and the end face of the second optical fiber, the end face of the first optical fiber thereby causing light travelling through the first optical fiber to experience total internal reflection at the end face of the first optical fiber when in the disconnection state, wherein, in the disconnection state, the gap is of uniform width between the end faces of the first and second optical fibers.

6. An optical connector comprising:

a first optical fiber having a core through which light travels in a travelling direction, the first optical fiber having an end face which is slanted so that a normal passing through the end face forms an angle θ

with respect to the travelling direction of light through the core with sin θ

≧

1/n, where n is a refractive index of the core;

a second optical fiber having an end face; and

a connection mechanism which provides

a connection state where the end face of the first optical fiber is in close contact with the end face of the second optical fiber so that light travelling through the first optical fiber travels into the second optical fiber, and

a disconnection state where an air gap exists between the end face of the first optical fiber and the end face of the second optical fiber, the end face of the first optical fiber thereby causing light travelling through the first optical fiber to experience total internal reflection at the end face of the first optical fiber when in the disconnection state,

wherein the optical connector is changeable between the connection state and the disconnection state by moving at least one of the first and second optical fibers in the axial direction, and, in the disconnection state, the gap is of uniform width between the end faces of the first and second optical fibers.

7. An optical connector comprising:

first and second optical fibers which each has a slanted end face, wherein

the optical connector provides a connection state where the end face of the first optical fiber is aligned with, and in close contact with, the end face of the second optical fiber so that light travelling through the first optical fiber travels into the second optical fiber, and

the optical connector provides a disconnection state where a uniform width gap exists between the end face of the first optical fiber and the end face of the second optical fiber, the end face of the first optical fiber causing light travelling through the first optical fiber to be totally reflected at the end face of the first optical fiber when in the disconnection state.

8. An optical connector as in claim 7, wherein

the first optical fiber has a core and light travels through the core in a travelling direction, and

a normal passing through the end face of the first optical fiber forms an angle θ

with respect to the travelling direction of light through the core so that sin θ

≧

1/n, where n is a refractive index of the core of the first optical fiber.

9. An optical connector as in claim 7, wherein

the first optical fiber has a core with a refractive index equal to or below 1.6, and light travels through the core in a travelling direction, and

a normal passing through the end face of the first optical fiber forms an approximately 42°

angle with respect to the travelling direction of light through the core.

10. An optical connector as in claim 7, further comprising:

a first ferrule which holds the first optical fiber and has a slanted end face aligned with, and in the same plane as, the end face of the first optical fiber; and

a second ferrule which holds the second optical fiber and has a slanted end face aligned with, and in the same plane as, the end face of the second optical fiber,

wherein the end face of the first ferrule is aligned with the end face of the second ferrule.

11. An optical connector as in claim 10, wherein, when the optical connector provides the connection state, the end face of the first ferrule is aligned with, and in close contact with, the end face of the second ferrule so that substantially no gap exists between the end faces of the first and second optical fibers.

12. An optical connector as in claim 10, further comprising:

a spring exerting a force which separates the first and second ferrules when the optical connector provides the disconnection state.

13. An optical connector as in claim 7, wherein the optical connector is changeable between the connection state and the disconnection state by moving at least one of the first and second optical fibers in the axial direction.

14. An optical connector comprising:

a first optical fiber having a core through which light travels in a travelling direction, the first optical fiber having an end face which is slanted so that a normal passing through the end face forms an angle θ

with respect to the travelling direction of light through the core with sin θ

≧

1/n, where n is a refractive index of the core;

a second optical fiber having an end face; and

a connection mechanism which provides

a connection state where the end face of the first optical fiber is in close contact with the end face of the second optical fiber so that light travelling through the first optical fiber travels into the second optical fiber, and

a disconnection state where a uniform width air gap exists between the end face of the first optical fiber and the end face of the second optical fiber, the end face of the first optical fiber thereby causing light travelling through the first optical fiber to be totally reflected at the end face of the first optical fiber when in the disconnection state.

15. An optical connector as in claim 14, wherein, when in the disconnection state, light totally reflected at the end face of the first optical fiber is incident on a portion of the first optical fiber, said portion being a light absorbing part which absorbs the incident light.

16. An optical connector as in claim 14, further comprising:

a housing device which houses the end faces of the first and second optical fibers so that, in the connection state, the end faces are enclosed by the housing device and, in the disconnection state, the end faces and the gap are enclosed by the housing device.

17. An optical connector as in claim 16, wherein

the first optical fiber has first and second ends, said end face of the first optical fiber being an end face of the first end, and the second end of the first optical fiber for connection to a third optical fiber, and

the second end of the first optical fiber is outside of the housing device.

18. An optical connector as in claim 14, wherein the optical connector is changeable between the connection state and the disconnection state by moving at least one of the first and second optical fibers in the axial direction.

19. An optical connector comprising:

a first optical fiber having a core through which light travels in a travelling direction, the first optical fiber having an end face which is slanted so that a normal passing through the end face forms an angle θ

with respect to the travelling direction of light through the core with sin θ

≧

1/n, where n is a refractive index of the core;

a second optical fiber having an end face; and

a connection mechanism which provides

a connection state where the end face of the first optical fiber is in close contact with the end face of the second optical fiber so that light travelling through the first optical fiber travels into the second optical fiber, and

a disconnection state where an air gap exists between the end face of the first optical fiber and the end face of the second optical fiber, the end face of the first optical fiber thereby causing light travelling through the first optical fiber to be totally reflected at the end face of the first optical fiber when in the disconnection state,

wherein, when in the disconnection state, light totally reflected at the end face of the first optical fiber is incident on a portion of the first optical fiber, said portion being a light absorbing part which absorbs the incident light.

20. An optical connector comprising:

first and second optical fibers which each has a slanted end face, wherein

the optical connector provides a connection state where the end face of the first optical fiber is aligned with, and in close contact with, the end face of the second optical fiber so that light travelling through the first optical fiber travels into the second optical fiber,

the optical connector provides a disconnection state where a gap exists between the end face of the first optical fiber and the end face of the second optical fiber, the end face of the first optical fiber causing light travelling through the first optical fiber to be totally reflected at the end face of the first optical fiber when in the disconnection state, and,

in the disconnection state, the gap is of uniform width between the end faces of the first and second optical fibers.

21. An optical connector comprising:

first and second optical fibers which each has a slanted end face, wherein

the optical connector provides a connection state where the end face of the first optical fiber is aligned with, and in close contact with, the end face of the second optical fiber so that light travelling through the first optical fiber travels into the second optical fiber,

the optical connector provides a disconnection state where a gap exists between the end face of the first optical fiber and the end face of the second optical fiber, the end face of the first optical fiber causing light travelling through the first optical fiber to be totally reflected at the end face of the first optical fiber when in the disconnection state,

the optical connector further comprising a housing device which houses the end faces of the first and second optical fibers so that, in the connection state, the end faces are enclosed by the housing device and, in the disconnection state, the end faces and the gap are enclosed by the housing device, and

in the disconnection state, the gap is of uniform width between the end faces of the first and second optical fibers.

22. An optical connector comprising:

a first optical fiber having a core through which light travels in a travelling direction, the first optical fiber having an end face which is slanted so that a normal passing through the end face forms an angle θ

with respect to the travelling direction of light through the core with sin θ

≧

1/n, where n is a refractive index of the core;

a second optical fiber having an end face;

a connection mechanism which provides

a connection state where the end face of the first optical fiber is in close contact with the end face of the second optical fiber so that light travelling through the first optical fiber travels into the second optical fiber, and

a disconnection state where an air gap exists between the end face of the first optical fiber and the end face of the second optical fiber, the end face of the first optical fiber thereby causing light travelling through the first optical fiber to be totally reflected at the end face of the first optical fiber when in the disconnection state, wherein, in the disconnection state, the gap is of uniform width between the end faces of the first and second optical fibers.

23. An optical connector comprising:

a first optical fiber having a core through which light travels in a travelling direction, the first optical fiber having an end face which is slanted so that a normal passing through the end face forms an angle θ

with respect to the travelling direction of light through the core with sin θ

≧

1/n, where n is a refractive index of the core;

a second optical fiber having an end face; and

a connection mechanism which provides

a connection state where the end face of the first optical fiber is in close contact with the end face of the second optical fiber so that light travelling through the first optical fiber travels into the second optical fiber, and

a disconnection state where an air gap exists between the end face of the first optical fiber and the end face of the second optical fiber, the end face of the first optical fiber thereby causing light travelling through the first optical fiber to be totally reflected at the end face of the first optical fiber when in the disconnection state, wherein

the optical connector is changeable between the connection state and the disconnection state by moving at least one of the first and second optical fibers in the axial direction, and,

in the disconnection state, the gap is of uniform width between the end faces of the first and second optical fibers.

24. An optical connector comprising:

first and second optical fibers which each has a slanted end face, wherein

the optical connector provides a connection state where the end face of the first optical fiber is aligned with, and in close contact with, the end face of the second optical fiber so that light travelling through the first optical fiber travels into the second optical fiber,

the optical connector provides a disconnection state where a gap exists between the end face of the first optical fiber and the end face of the second optical fiber, the end face of the first optical fiber causing light travelling through the first optical fiber to be totally reflected at the end face of the first optical fiber when in the disconnection state,

the first optical fiber has a core and light travels through the core in a travelling direction,

a normal passing through the end face of the first optical fiber forms an angle θ

with respect to the travelling direction of light through the core so that sin θ

≧

1/n, where n is a refractive index of the core of the first optical fiber, and

the first optical fiber has a core with a refractive index equal to or below 1.6, and light travels through the core in a travelling direction, and

a normal passing through the end face of the first optical fiber forms an approximately 42°

angle with respect to the travelling direction of light through the core.