Optical input system and method

• US 8,223,128 B1
• Filed: 10/08/2008
• Issued: 07/17/2012
• Est. Priority Date: 10/08/2008
• Status: Expired due to Fees

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Edwards, Andrew G., Burns, Charles J., Hartigan, George S. Jr.
• Primary Examiner(s): Shalwala, Bipin
• Assistant Examiner(s): Ketema, Benyam
• Application Number:
  US12/247,668
• Time in Patent Office: 1,378 Days
• Field of Search: 345/32, 345/170, 362/26, 341/31
• US Class Current: 345/170
• CPC Class Codes: G02F 1/0115 in optical fibres
• CPC Class Codes: G06F 3/0202 Constructional details or processes of manufacture of the input device
• CPC Class Codes: G06F 3/023 Arrangements for converting discrete items of information into a coded form, e.g. arrangements for interpreting keyboard generated codes as alphanumeric codes, operand codes or instruction codes
• CPC Class Codes: H03M 11/26 using opto-electronic means
• CPC Class Codes: H04L 12/40 Bus networks

Abstract

An input system comprises an optical device configured to transmit and receive one or more optical signals along a segment of fiber optic cable; an optical input device connected to the segment of fiber optic cable, the optical input including an input key configured to reflect a portion of an optical signal as a consequence of being actuated; and a signal decoder connected to the optical device, the signal decoder configured to select a first input code from a plurality of input codes, the first input code corresponding to the portion of the optical signal reflected by the input key.

Claims

1. An optical input system, comprising:

a first optical fiber segment defining a beam path;

a source for injecting a first optical signal into the first optical fiber segment;

a first input device including;

a first input key;

a first beam splitter disposed along the first optical fiber segment at a first location, the beam splitter for dividing the first optical signal into a first portion that continues along the beam path of the first optical fiber segment and a second portion that diverges from the first portion; and

a first reflector connected to the first input key for reflecting the second portion of the first optical signal in response to actuation of the first input key; and

a detector for receiving the second portion of the first optical signal reflected by the first reflector and determining whether the first input key is actuated; and

a signal decoder configured to select a first input code from a plurality of input codes, the first input code corresponding to the reflected signal.

2. The system of claim 1, wherein the input key is configured to reversibly move from a first position to a second position.

3. The system of claim 2, wherein the input key is actuated in the second position.

4. The system of claim 1, wherein the beam splitter is configured to divide the first optical signal based on a predetermined wavelength or predetermined range of wavelengths.

5. The system of claim 1, wherein the beam splitter is configured to divide the first optical signal based on a predetermined wavelength or predetermined range of frequencies.

6. The system of claim 1, wherein the first input device further comprises:

a second input key;

a second beam splitter disposed along the optical fiber segment at a second location, the second beam splitter for dividing the first portion of the first optical signal into a third portion and a fourth portion, wherein the third portion of the first optical signal continues along the beam path of the optical fiber segment and the fourth portion of the optical signal diverges from the first portion; and

a second reflector for reflecting the fourth portion of the first optical signal in response to the actuation of the second input key.

7. The system of claim 6, wherein the detector is also for receiving the fourth portion of the first optical signal reflected by the second reflector and determining whether the first or second input key is actuated.

8. The system of claim 7, wherein the signal decoder is further configured to select a second input code from a plurality of input codes, the second input code corresponding to the fourth portion of the first optical signal reflected by the second reflector.

9. The system of claim 8, wherein the plurality of input codes includes at least one of an ASCII code, a UNICODE code point, or a UCS code point.

10. The system of claim 8 further comprising an optical repeater disposed between the source and the optical input device.

11. The system of claim 1, further comprising:

a second input device, the second input device including;

a first input key;

a first beam splitter disposed along a second optical fiber segment at a first location of the second optical fiber segment, the first beam splitter of the second input device for dividing a second optical signal into a first portion that continues along a beam path of the second optical fiber segment and a second portion that diverges from the first portion of the second optical signal; and

a first reflector for reflecting the second portion of the second optical signal in response to actuation of the first input key of the second input device; and

an optical multiplexer connected to the first and second optical fiber segments, the optical multiplexer for combining the second portions of the first and second optical signals into a combined signal and transmitting the combined signal to the detector.

12. The system of claim 11, wherein the optical multiplexer is a wave division multiplexer.

13. An optical input method, comprising the steps of:

transmitting an optical signal along a beam path of a fiber optic cable;

diverting a first portion of the optical signal towards a reflector;

reflecting the first portion of the optical signal if a first input key is actuated;

determining a characteristic of the reflected optical signal; and

selecting a first input code from a plurality of input codes, the first input code corresponding to the reflected signal.

14. The optical input method of claim 13, further comprising:

transmitting the first input code over a standard computer peripheral interface.

15. The optical input method of claim 13, wherein the characteristic of the signal is a predetermined wavelength or predetermined range of wavelengths of the reflected signal.

16. The optical input method of claim 13, wherein the characteristic of the signal is a predetermined frequency or predetermined range of frequencies of the reflected signal.

17. The optical input method of claim 13, further comprising:

diverting at least a second portion of the optical signal towards a second reflector;

reflecting the second portion of the optical signal as a second reflected signal if a second input key is actuated;

determining a characteristic the second reflected signal; and

selecting a second input code from the plurality of input codes, the second input code corresponding to the second reflected signal.

18. An input system comprising:

an optical device for transmitting and receiving one or more optical signals along a segment of fiber optic cable;

an optical input device including an input key for reflecting a portion of an optical signal in response to being actuated; and

a signal decoder for selecting a first input code from a plurality of input codes, the first input code corresponding to the portion of the optical signal reflected by the input key.

19. The input system of claim 18, wherein the optical input device further includes:

a beam splitter for dividing an optical signal into a first portion and a second portion; and

a reflector for reflecting the second portion of the divided optical signal in response to actuation of the input key.

20. The input system of claim 19, wherein the beam splitter divides the optical signal based on a predetermined wavelength or a predetermined range of wavelengths.

21. The input system of claim 19, wherein the beam splitter is configured to divide the optical signal based on a predetermined frequency or a predetermined range of frequencies.

22. The input system of claim 18, further comprising:

a second optical input device including a second input key for reflecting a portion of an optical signal in response to being actuation; and

a first optical multiplexer for combining the reflected signal portions received from the first and second input devices and for transmitting the combined signal to the optical device.

23. The input system of claim 22, further comprising:

a second optical device for transmitting and receiving one or more optical signals along a third segment of fiber optic cable; and

a second optical multiplexer connected for combining signals received from the first and second optical devices and for transmitting the combined signal to the first optical multiplexer.

24. The input system of claim 23, wherein the first optical multiplexer demultiplexes the combine signal received from the second optical multiplexer.

25. The input system of claim 18 further comprising an optical repeater disposed between the optical device and the optical input device.