High-bandwidth underwater data communication system

Patent metadata

Field	Value
Publication number	US-10341032-B2
Application number	US-201715664707-A
Country	US
Kind code	B2
Filing date	Jul 31, 2017
Priority date	Mar 15, 2013
Publication date	Jul 2, 2019
Grant date	Jul 2, 2019

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 perform seismic exploration in an aqueous medium, comprising:
an ocean bottom seismometer (OBS) unit placed on a seabed to receive seismic data;
a data conversion module of the OBS unit to convert the seismic data into an optical signal with a first format configured for optical transmission via the aqueous medium;
at least one of the OBS unit placed on the seabed and an underwater vehicle to:
establish, between the OBS unit and the underwater vehicle separated from the OBS unit by the aqueous medium, an optical link through the aqueous medium; and
determine a condition of the aqueous medium from a measurement of a characteristic of the optical link;

a controller of the OBS unit to adjust a parameter associated with the optical signal based on the characteristic of the aqueous medium;
an optical transmitter of the OBS unit placed on the seabed to transmit, via the optical link, the optical signal to an optical receiver of the underwater vehicle, the optical signal comprising the first format and the seismic data, the optical signal adjusted by the OBS unit based on the characteristic of the aqueous medium; and
the underwater vehicle to:
receive the optical signal transmitted by the optical transmitter of the OBS unit placed on the seabed via the optical link through the aqueous medium;
convert, responsive to receipt of the optical signal, the optical signal into a non-optical signal comprising a second format; and
provide the non-optical signal in the second format to a retrieval device.

2. The system of claim 1 , comprising:
the OBS unit comprising a geophone to receive the seismic data.

3. The system of claim 1 , comprising:
the retrieval device provided on a vessel to receive the non-optical signal in the second format.

4. The system of claim 1 , comprising:
a cable,
wherein the underwater vehicle provides the non-optical signal to the retrieval device, the non-optical signal comprising the seismic data received from the OBS unit placed on the seabed.

5. The system of claim 1 , comprising the OBS unit placed on the seabed to:
detect a presence of the underwater vehicle; and
enter a power up state responsive to the detection to transmit the optical signal.

6. The system of claim 1 , wherein the OBS unit placed on the seabed comprises:
a detector to provide an indication to a wake-up system to turn on one or more of a storage and control system, a sensor, or the optical transmitter;
the wake-up system, in response to the indication from the detector, to:
identify the optical link established between the OBS unit placed on the seabed and the underwater vehicle;
determine a quality control parameter of the optical link; and
validate, based on the quality control parameter, the optical link.

7. The system of claim 6 , comprising the OBS unit placed on the seabed to:
transmit, responsive to the optical link validated by the wake-up system, the optical signal to the optical receiver of the underwater vehicle.

8. The system of claim 6 , comprising the OBS unit to:
transmit, responsive to the optical link validated by the wake-up system, to the underwater vehicle, information sensed by a sensor of the OBS unit placed on the seabed.

9. The system of claim 6 , comprising:
the detector comprising at least one of a motion detector, a magnetic detector or a proximity detector.

10. The system of claim 1 , wherein the parameter comprises at least one of a data rate of the optical signal, an output intensity of the optical signal, a wavelength of the optical signal, and a gain of the optical receiver.

11. The system of claim 1 , comprising:
the optical receiver of the underwater vehicle further configured to sense an angle of the optical transmitter of the OBS unit; and
the underwater vehicle configured to select, based on a signal from the angle sensed by the optical receiver, an anode in a multiple-anode photomultiplier tube to align an angular field of view of the optical receiver with the optical transmitter.

12. A method of performing seismic exploration in an aqueous medium, comprising:
placing an ocean bottom seismometer (OBS) unit on a seabed;
receiving, by the OBS unit, seismic data;
converting, by a data conversion module of the OBS unit, the seismic data into an optical signal with a first format configured for optical transmission via the aqueous medium;
establishing, between the OBS unit and an underwater vehicle separated from the OBS unit by the aqueous medium, an optical link through the aqueous medium;
determining a condition of the aqueous medium from a measurement of a characteristic of the optical link;
adjusting, by a controller of the OBS unit, a parameter associated with the optical signal based on the characteristic of the aqueous medium;
transmitting, by an optical transmitter of the OBS unit placed on the seabed, via the optical link, the optical signal to an optical receiver of the underwater vehicle, the optical signal comprising the first format and the seismic data, the optical signal adjusted by the OBS unit based on the characteristic of the aqueous medium;
receiving, by the underwater vehicle, the optical signal transmitted by the optical transmitter of the OBS unit placed on the seabed via the optical link through the aqueous medium;
converting, by the underwater vehicle, responsive to receipt of the optical signal, the optical signal into a non-optical signal comprising a second format; and
providing, by the underwater vehicle, the non-optical signal in the second format to a retrieval device.

13. The method of claim 12 , comprising:
receiving, by a geophone of the OBS unit, the seismic data.

14. The method of claim 12 , comprising:
receiving, by the retrieval device provided on a vessel, the non-optical signal in the second format.

15. The method of claim 12 , comprising:
providing a cable;
providing, by the underwater vehicle, the non-optical signal to the retrieval device, the non-optical signal comprising the seismic data received from the OBS unit placed on the seabed.

16. The method of claim 12 , comprising:
detecting, by the OBS unit placed on the seabed, a presence of the underwater vehicle; and
entering a power up state responsive to the detection to transmit the optical signal.

17. The method of claim 12 , comprising:
providing, by a detector of the OBS unit placed on the seabed, an indication to a wake-up system to turn on one or more of a storage and control system, a sensor, or the optical transmitter;
identifying, by the wake-up system responsive to the indication from the detector, the optical link established between the OBS unit placed on the seabed and the underwater vehicle;
determining, by the wake-up system, a quality control parameter of the optical link; and
validating, by the wake-up system, based on the quality control parameter, the optical link.

18. The method of claim 17 , comprising:
transmitting, by the OBS unit placed on the seabed, responsive to the optical link validated by the wake-up system, the optical signal to the optical receiver of the underwater vehicle.

19. The method of claim 17 , comprising:
transmitting, by the OBS unit responsive to the optical link validated by the wake-up system, to the underwater vehicle, information sensed by a sensor of the OBS unit placed on the seabed.

20. The method of claim 17 , wherein:
the detector comprises at least one of a motion detector, a magnetic detector or a proximity detector; and
the pa

Assignees

• Fairfield Ind Inc
• Magseis Ff Llc

Inventors

• Hopewell William
• Lacovara Philip
• Morris Michael

Classifications

• H03G3/3084

  in receivers or transmitters for electromagnetic waves other than radiowaves, e.g. lightwaves (H03G3/32, H03G3/34 take precedence) · CPC title

• H04B10/80

  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 title

• H04B13/02 Primary

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

• H04L27/2697

  in combination with other modulation techniques · CPC title

• H04B10/1125

  using a single common optical path · CPC title