Optical Communication Systems and Methods

• US 20150132004A1
• Filed: 12/01/2014
• Published: 05/14/2015
• Est. Priority Date: 02/06/2006
• Status: Active Grant

• Current Assignee: Woods Hole Oceanographic Institution
• Original Assignee: Woods Hole Oceanographic Institution
• Inventors: Farr, Norman E., Chave, Alan D., Ware, Johnathan, Pontbriand, Clifford T.
• Granted Patent: US 9,231,708 B2
• Time in Patent Office: Days
• US Class Current: 398/104
• CPC Class Codes: H04B 10/80 Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
• CPC Class Codes: H04B 13/02 Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

A system and method to broadcast an optical signal through an amorphous medium, including a primary emitter capable of producing a primary optical signal during at least one broadcast period and capable of transmitting the primary optical signal through the amorphous medium. A secondary emitter, separate from the primary emitter and in operation during at least a portion of the broadcast period, produces a secondary emission detectable by a detector during the broadcast period. A signal entrainment controller, in communication with the primary emitter and the secondary emitter, synchronizes the secondary emitter with the primary emitter to generate a resultant signal of higher intensity than the primary signal by itself.

Claims

1. A system capable of operating in an amorphous medium to broadcast an optical signal through the amorphous medium to a remote detector capable of detecting the optical signal within the amorphous medium, the system comprising:

a primary emitter capable of producing a primary optical signal having a first intensity during at least one broadcast period and capable of transmitting the primary optical signal through the amorphous medium;

at least one secondary emitter separate from the primary emitter and in operation during at least a portion of the broadcast period, the secondary emitter being capable of producing a secondary emission having a second intensity detectable by the detector during the broadcast period; and

a signal entrainment controller in communication with the primary emitter and the secondary emitter, wherein the signal entrainment controller synchronizes the secondary emitter with the primary emitter to generate a resultant signal of higher intensity within the amorphous medium than the intensity of the primary signal by itself.

2. The system of claim 1 wherein the controller modulates the second intensity of the secondary emitter in synchrony with the primary optical signal.

3. The system of claim 1 wherein the resultant signal is of higher intensity than either the intensities of the primary signal or the secondary signal alone.

4. The system of claim 1 wherein the primary optical signal and the secondary emission each have a timing, and the controller changes the timing of the secondary emission relative to primary optical signal to achieve substantially simultaneous reception by the detector of both signals.

5. The system of claim 1 wherein the amorphous medium includes water.

6. The system of claim 1 wherein the secondary emitter is normally operated at a duty cycle of at least 50 percent when activated.

7. The system of claim 1 wherein the secondary emitter is at least one of a work site light, a light to illuminate a photographic subject, a light on a submersible vehicle, a hand-held light, and a beacon.

8. The system of claim 1 wherein the controller includes at least one of a multiplexer and a signal splitter.

9. The system of claim 1 further including the remote detector, wherein the detector is capable of detecting at least the primary signal within the amorphous medium.

10. The system of claim 1 further including at least one receiver such that the system is capable of bidirectional communication with at least a third, remote emitter as well as the remote detector.

11. The system of claim 10 wherein the secondary emitter is suppressed when the receiver senses that a remote emitter is transmitting an optical signal.

12. A method of broadcasting an optical signal through an amorphous medium, comprising:

selecting a primary emitter capable of producing a primary optical signal during at least one broadcast period;

selecting a detector capable of detecting the primary signal within the amorphous medium;

selecting at least one secondary emitter separate from the primary emitter and being capable of producing a secondary emission detectable by the detector during the broadcast period;

producing a primary optical signal from the primary emitter during at least one broadcast period and transmitting the primary optical signal through the amorphous medium; and

synchronizing the secondary emitter with the primary emitter, to generate a resultant signal of higher intensity than the primary signal by itself within the amorphous medium.

13. The method of claim 12 wherein synchronizing includes modulating the second intensity of the secondary emitter in synchrony with the primary optical signal.

14. The method of claim 12 wherein the primary optical signal and the secondary emission each have a timing, and synchronizing includes changing the timing of the secondary emission relative to primary optical signal to achieve substantially simultaneous reception by the detector of both signals.

15. The method of claim 12 wherein substantially real-time transmission of photographic images via the resultant signal is achieved.

16. A method of converting a secondary emitter to enhance broadcasting of an optical signal through an amorphous medium to a detector capable of detecting the optical signal within the amorphous medium, the method comprising:

selecting a primary emitter capable of producing a primary optical signal during at least one broadcast period;

selecting at least one secondary emitter separate from the primary emitter, the secondary emitter normally operated at a duty cycle of at least 50 percent when activated and being capable of producing a secondary emission detectable by the detector during the broadcast period;

producing a primary optical signal from the primary emitter during at least one broadcast period and transmitting the primary optical signal through the amorphous medium; and

synchronizing the secondary emitter with the primary emitter, to modify the duty cycle of the secondary emitter and generate a resultant signal of higher intensity than the primary signal by itself within the amorphous medium.

17. The method of claim 16 wherein the secondary emitter is normally operated at a duty cycle of at least 75 percent when activated.