Data communications and illuminated light on the same optical fiber

• US 5,602,668 A
• Filed: 11/30/1994
• Issued: 02/11/1997
• Est. Priority Date: 11/30/1994
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Kuchta, Daniel M.
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): NEGASH, KINFE MICHAEL
• Application Number:
  US08/346,644
• Time in Patent Office: 804 Days
• Field of Search: 359/129, 359/133, 359/142, 359/159, 359/118, 359/169-170, 359/172, 359/173, 455/151.2, 340/825.72
• US Class Current: 398/172
• CPC Class Codes: H04B 10/1141 One-way transmission
• CPC Class Codes: H04B 10/1149 Arrangements for indoor wireless networking of information
• CPC Class Codes: H04B 10/116 Visible light communication

Abstract

An a) infrared data signal and a b) visible light signal including infrared shot noise are provided to opposite sides of a cold bandpass mirror for transmitting the infrared data signal into a light pipe and for reflecting the visible light signal into the light pipe and for transmitting the infrared shot noise through the cold bandpass mirror and away from the light pipe. Further, a first lens is situated between a) a source of the infrared data signal and b) the cold bandpass mirror, for focusing the infrared data signal onto the cold bandpass mirror to prevent its diffusion. And further, a second lens is situated between the cold bandpass mirror and the light pipe for focusing the infrared data signal and visible light into the light pipe. And further, a third lens situated between the a) source of the infrared shot noise and visible light and b) the cold bandpass mirror, for focusing the visible light signal and infrared shot noise onto the cold bandpass mirror. Further, two separate optical data sources (FIG. 4) provide two distinct optical data signals (FIG. 4) through the optical fiber, or light pipe. Further, one or more optical data signals--infrared or otherwise--are received at mobile or immobile IR data I/O ports (FIG. 7,8).

Claims

1. An apparatus for providing both visible light and a data signal through a single light pipe, comprising:

a) an infrared source for providing an infrared data signal along a first line;

b) a visible light source including infrared shot noise for providing a visible light signal along a second line;

c) a cold bandpass mirror for transmitting infrared light including said infrared data signal and infrared shot noise and for reflecting said visible light signal; and

d) a light pipe for receiving said infrared data signal and visible light signal, but not said infrared shot noise, wherein said infrared data signal and visible light signal enter said light pipe at a first end.

2. The apparatus of claim 1, further including another cold bandpass mirror situated at a second end of said light pipe which is remote from said first end, for filtering out said visible light signal and providing it to a fiber distributed lighting system, said cold bandpass mirror providing said infrared data signal to an infrared data receiver.

3. The apparatus of claim 1, further including a first lens situated between said infrared source and said cold bandpass mirror for focusing said infrared data signal onto said cold bandpass mirror.

4. The apparatus of claim 1, further including a lens situated between said cold bandpass mirror and said light pipe for focusing said infrared data signal and said visible light into said light pipe.

5. The apparatus of claim 1, further including a lens situated between said visible light source and said cold bandpass mirror, for focusing said visible light signal and infrared shot noise onto said cold bandpass mirror.

6. The apparatus of claim 1, wherein said cold bandpass mirror is situated at a 45°

angle to both said infrared signal source and visible light source and wherein said first line and second line are orthogonal.

7. The apparatus of claim 1, further comprising at least one of:

a first lens situated between said infrared source and said cold bandpass mirror for focusing said infrared data signal onto said cold bandpass mirror;

a second lens situated between said cold bandpass mirror and said light pipe for focusing said infrared data signal and said visible light into said light pipe; and

a third lens situated between said visible light source and said cold bandpass mirror for focusing said visible light signal and infrared shot noise onto said cold bandpass mirror.

8. An apparatus for providing a first light signal and a second light signal through a single optical fiber, comprising:

a) a first signal source for providing a first optical signal along a first line;

b) a second signal source for providing a second optical signal along a second line orthogonal to said first line;

c) a cold mirror, for transmitting said first optical signal and reflecting said second optical signal; and

d) a light pipe for receiving said first signal and said second signal.

9. The apparatus of claim 8 wherein either said first signal and second signal are data signals.

10. The apparatus of claim 8 wherein either of said first or second signals is an infrared data signal.

11. The apparatus of claim 8 wherein said first signal is directed for transmission through said cold bandpass mirror into said light pipe and wherein said second signal is directed towards cold bandpass mirror not into said light pipe, such that said first signal is transmitted directly through said cold bandpass mirror into said light pipe and said second signal is reflected off of said cold bandpass mirror into said light pipe, but so much of said second signal as includes spectral components in the range of said first signal is transmitted through said cold bandpass mirror and away from, or at least not into, said light pipe.

12. The apparatus of claim 8, wherein said second optical signal is a visible light signal, said first optical signal is an infrared data signal and said apparatus includes a third signal which is an optical data signal in a frequency range outside of the second data signal, said first and third signals being both directed at said cold bandpass mirror for passing through it.

13. The apparatus of claim 8, wherein said second optical signal is a visible light signal, said first optical signal is an infrared data signal and said apparatus includes a third signal which is an infrared data signal in a frequency range outside of the second data signal, said first and third signals being both directed at said cold bandpass mirror for passing through it.

14. The apparatus of claim 8 wherein either of said first or second signals is an infrared data signal and wherein said apparatus including an infrared local area network including one or more computers for receiving said first and second optical signals.

15. The apparatus of claim 8 wherein either of said first or second signals is an infrared data signal and wherein said apparatus includes one or more infrared data I/O ports for receiving said first or second optical signals.

16. The apparatus of claim 8 wherein either of said first or second signals is an infrared data signal and wherein said apparatus includes one or more mobile infrared data I/O ports for receiving said first or second optical signals.

17. A method for providing both visible light and a data signal through a single light pipe, comprising:

a) providing an infrared data signal along a first line;

b) providing a visible light signal along a second line wherein said visible light includes infrared shot noise;

c) transmitting infrared light including said infrared data signal and infrared shot noise through a cold bandpass mirror and reflecting said visible light signal off said cold bandpass mirror; and

d) receiving in a light pipe said infrared data signal and visible light signal, but not said infrared shot noise, wherein said infrared data signal and visible light signal enter said light pipe at a first end.

18. The method of claim 17, further including filtering out said visible light signal through another cold bandpass mirror and providing it to a fiber distributed lighting system, said cold bandpass mirror providing said infrared data signal to an infrared data receiver.

19. The method of claim 17, further including focusing said infrared data signal onto said cold bandpass mirror through a lens.

20. The method of claim 17, further including focusing said infrared data signal and said visible light into said light pipe through a lens.

21. The method of claim 17, further including focusing said visible light signal and infrared shot noise onto said cold bandpass mirror through a lens.

22. The method of claim 17, wherein said cold bandpass mirror is situated at a 45°

angle to both said infrared signal source and visible light source and wherein said first line and second line are orthogonal.

23. A method for providing a first light signal and a second light signal through a single optical fiber, comprising:

a) providing a first optical signal along a first line;

b) providing a second optical signal along a second line orthogonal to said first line;

c) transmitting said first optical signal through a cold bandpass mirror and reflecting said second optical signal off of said cold bandpass mirror; and

d) receiving said first signal and said second signal in a light pipe.

24. The method of claim 23 wherein either said first signal and second signal are data signals.

25. The method of claim 23 wherein either of said first or second signals is an infrared data signal.

26. The method of claim 23 wherein said first signal is directed for transmission through said cold bandpass mirror into said light pipe and wherein said second signal is directed towards cold bandpass mirror not into said light pipe, such that said first signal is transmitted directly through said cold bandpass mirror into said light pipe and said second signal is reflected off of said cold bandpass mirror into said light pipe, but so much of said second signal as includes spectral components in the range of said first signal is transmitted through said cold bandpass mirror and away from, or at least not into, said light pipe.

27. The method of claim 23, wherein said second optical signal is a visible light signal, said first optical signal is an infrared data signal and said method includes a third signal which is an optical data signal in a frequency range outside of the second data signal, said first and third signals being both directed at said cold bandpass mirror for passing through it.

28. The method of claim 23, wherein said second optical signal is a visible light signal, said first optical signal is an infrared data signal and said method includes a third signal which is an infrared data signal in a frequency range outside of the second data signal, said first and third signals being both directed at said cold bandpass mirror for passing through it.

29. The method of claim 23 wherein either of said first or second signals is an infrared data signal and wherein said method further includes the step of diffusing said first signal and said second signal received in said light pipe to at least one of a workstation, a piece of office equipment, and a computer.

30. The method as set forth in claim 29 wherein the step of diffusing is performed to diffuse said first signal and said second signal to at least one infrared data I/O port of said at least one of a workstation, a piece of office equipment, and a computer.

31. The method as set forth in claim 30 wherein said at least one infrared data I/O port is either fixed or mobile.