High-bandwidth underwater data communication system

Patent metadata

Field	Value
Publication number	US-9490910-B2
Application number	US-201313843942-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	Mar 15, 2013
Publication date	Nov 8, 2016
Grant date	Nov 8, 2016

Abstract

An apparatus is described which uses directly modulated InGaN Light-Emitting Diodes (LEDs) or InGaN lasers as the transmitters for an underwater data-communication device. The receiver uses automatic gain control to facilitate performance of the apparatus over a wide-range of distances and water turbidities.

First claim

What is claimed is:

1. A system to optically transmit and receive seismic data through an aqueous medium, comprising:
a retrieval device comprising a first optical transmitter to transmit light and a first optical receiver;
an ocean bottom seismic (“OBS”) node comprising:
a second optical receiver to detect a presence of the retrieval device based on the light transmitted by the first optical transmitter of the retrieval device;
a controller configured to adjust, responsive to identification of an underwater environmental condition, a transmission parameter used by the second optical transmitter to transmit the seismic data; and
a second optical transmitter to enter a power up state responsive to detection, by the second optical receiver, of the presence of the retrieval device, and transmit the seismic data through the aqueous medium using light based on the transmission parameter adjusted by the controller;

the first optical receiver of the retrieval device configured to receive the light corresponding to the seismic data transmitted through the aqueous medium by the second optical transmitter of the OBS node;
the retrieval device further comprising:
one or more optical detectors to sense a relative angle of the second optical transmitter; and
at least one controller to select, based on a signal from the one or more optical detectors of the retrieval device, an anode in a multiple-anode photomultiplier tube and align an angular field of view of the first optical receiver with the second optical transmitter;

a photodiode of the first optical receiver that generates electrical output based on the light received by the first optical receiver from the second optical transmitter; and
an automatic gain control amplifier of the retrieval device that receives the electrical output from the first optical receiver and adjusts a level of the electrical output.

2. The system of claim 1 , wherein the second optical transmitter and the second optical receiver are enclosed in a waterproof container with one or more optical windows for transmission of light through the waterproof container into or out of the aqueous medium.

3. The system of claim 2 , wherein the second optical transmitter comprises at least one solid state light source.

4. The system of claim 3 , wherein the at least one solid state light source comprises an InGaN based light source.

5. The system of claim 3 , wherein the at least one solid state light source comprises an LED.

6. The system of claim 3 , wherein the at least one solid state light source comprises a laser.

7. The system of claim 6 , wherein the OBS node is configured to transmit data at a rate of about 10 Mbps or greater.

8. The system of claim 7 , wherein the OBS node is configured to transmit data at a rate of about 100 Mbps or greater.

9. The system of claim 8 , wherein the OBS node and the retrieval device are incorporated in an all-optical system for transmission of seismic data.

10. The system of claim 3 , comprising the controller configured to vary a drive current to the at least one solid state light source to modulate an output of the at least one solid state light source.

11. The system of claim 3 , wherein the retrieval device comprises:
the one or more optical detectors to sense a relative angle of the second transmitter; and
the controller configured to provide guidance commands to a platform on which the optical transmitter or optical receiver is mounted.

12. The system of claim 1 , wherein the second optical receiver comprises at least one of a silicon photodiode, a silicon PIN photodiode, an avalanche photodiode, and a hybrid photodiode.

13. The system of claim 1 , wherein the first optical receiver comprises a photomultiplier tube.

14. The system of claim 13 , wherein the photomultiplier tube comprises a plurality of gain stages, and wherein an output is extracted from a gain stage prior to a final gain stage.

15. The system of claim 1 , wherein the first optical receiver is configured to use a measurement of optical signal strength to control a gain of the automatic gain control amplifier following an optical detector.

16. The system of claim 1 , wherein the first optical receiver is configured to use a measurement of optical signal strength to control a gain of an optical detector.

17. The system of claim 1 , comprising the controller operatively coupled to one or both of the second optical transmitter and the second optical receiver, the controller configured to implement at least one channel coding technique during transmission.

18. The system of claim 1 , comprising the controller operatively coupled to one or both of the second optical transmitter and the second optical receiver, the controller configured to dynamically adjust the transmission parameter in response to the underwater environmental condition.

19. The system of claim 18 , wherein the controller is configured to control a gain of one or more amplifier elements in the OBS node to dynamically adjust the transmission parameter.

20. The system of claim 1 , comprising the controller operatively coupled to one or both of the second optical transmitter and the second optical receiver, the controller configured to implement at least one multi-carrier transmission modulation technique.

21. The system of claim 20 , wherein the at least one multi-carrier transmission modulation technique comprises optically based Orthogonal Frequency Division Multiplexing (OFDM).

22. The system of claim 1 , wherein the retrieval device comprises a transceiver configured to enter a power up state in response to a detected presence of another OBS node.

23. The system of claim 1 , wherein the one or more optical detectors are used to sense a relative angle of a remote transceiver, and the at least one controller is configured to align a local transceiver with the remote transceiver based on a second signal from the one or more optical detectors.

24. The system of claim 1 , wherein the OBS node comprises:
one or more sensors to detect a relative position of the first optical transmitter or the first optical receiver; and
the controller configured to align the second optical transmitter or the second optical receiver with the first optical transmitter or the first optical receiver based on a signal from the one or more sensors.

25. The system of claim 24 , wherein the controller is configured to control a platform for the OBS node based at least in part on the relative position.

26. The system of claim 1 , wherein the OBS node comprises:
one or more optical detectors to sense a relative angle of the first optical transmitter or the first optical receiver; and
the controller is configured to control a plurality of transmitting sources to direct light to the first optical receiver based on a signal from the one or more optical detectors of the OBS node.

27. The system of claim 1 , comprising one or more diffractive optical elements to collect an optical transmission beam.

28. The system of claim 1 , comprising one or more diffractive optical elements to steer an optical transmission beam.

29. The system of claim 1 , comprising one or more diffractive optical elements to shape an optical transmission beam.

30. The system of claim 1 , wherein the retrieval device is mounted on or in at least one of a remotely operated vehicle, an

Assignees

• Fairfield Ind Inc
• Fairfield Ind Inc

Inventors

• Lacovara Philip

Classifications

• H04B10/1123

  Bidirectional transmission · CPC title

• H04B10/80 Primary

  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 title

• H04B13/02

  Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy · CPC title

• H04B10/6931

  Automatic gain control of the preamplifier · CPC title

• G08C23/04

  using light waves, e.g. infrared · CPC title