HIGH-BANDWIDTH UNDERWATER DATA COMMUNICATION SYSTEM

• US 20170048005A1
• Filed: 10/26/2016
• Published: 02/16/2017
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Magseis FF, LLC
• Original Assignee: Fairfield Industries Incorporated
• Inventors: Lacovara, Philip
• Granted Patent: US 10,333,629 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G01V 1/226 Optoseismic systems
• CPC Class Codes: G08C 23/04 using light waves, e.g. infrared
• CPC Class Codes: H04B 10/112 Line-of-sight transmission over an extended range
• CPC Class Codes: H04B 10/1123 Bidirectional transmission
• CPC Class Codes: H04B 10/503 Laser transmitters
• CPC Class Codes: H04B 10/6931 Automatic gain control of the preamplifier
• 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: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2697 in combination with other modulation techniques

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.

Claims

1. A system to optically transfer 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 comprising one or more optical detectors to detect a presence of the retrieval device based on the light transmitted by the first optical transmitter of the retrieval device, and sense a relative angle of the first optical transmitter of the retrieval device;

one or more controllers to adjust, responsive to identification of an underwater environmental condition, a transmission parameter used by a second optical transmitter to transmit the seismic data, and control the second optical transmitter to direct light to the first optical receiver of the retrieval device based on the relative angle of the first optical transmitter of the retrieval device sensed by the one or more optical detectors; and

the 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 light directed towards the first optical receiver;

the first optical receiver of the retrieval device to receive the light corresponding to the seismic data transmitted through the aqueous medium by the second optical transmitter of the OBS node;

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 retrieval device comprises:

one or more optical detectors to sense the 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.

3. The system of claim 1, wherein the OBS node comprises:

the one or more controllers to select, based on a signal from the one or more optical detectors of the OBS node, an anode in a multiple-anode photomultiplier tube and align an angular field of view of the second optical receiver with the first optical transmitter.

4. The system of claim 1, wherein the second optical transmitter comprises a solid state light sources comprising at least one of an InGaN based light source, an LED, and a laser.

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

6. The system of claim 1, wherein the OBS node comprises one or more diffractive optical elements to steer an optical transmission beam towards the retrieval device.

7. The system of claim 1, wherein the OBS node uses a multi-carrier transmission modulation technique to transmit the seismic data to the retrieval device.

8. The system of claim 1, wherein the second optical transmitter transmits the light having a wavelength in the range of 400 nm-600 nm.

9. A system to optically transfer seismic data through an aqueous medium, comprising:

a retrieval device comprising a first optical transceiver to transmit and receive light;

an ocean bottom seismic (“

OBS”

) node comprising;

a second optical transceiver comprising one or more optical detectors to detect a presence of the retrieval device based on the light transmitted by the first optical transmitter of the retrieval device;

a controller to adjust, responsive to identification of an underwater environmental condition, a transmission parameter used by a second optical transceiver to transmit the seismic data; and

the second optical transceiver 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 retrieval device comprising;

the first optical transceiver comprising one or more optical detectors to sense a relative angle of the second optical transceiver of the OBS node;

one or more controllers to align the first optical transceiver in a direction with the second optical transceiver of the OBS node based on the relative angle of the second optical transceiver of the OBS node sensed by the one or more optical detectors; and

the first optical transceiver to receive the light corresponding to the seismic data transmitted through the aqueous medium by the second optical transceiver of the OBS node;

a photodiode of the first optical transceiver that generates electrical output based on the light received by the first optical transceiver from the second optical transceiver; and

an automatic gain control amplifier of the retrieval device that receives the electrical output from the first optical transceiver and adjusts a level of the electrical output.

10. The system of claim 9, wherein the OBS node comprises:

one or more optical detectors to sense a relative angle of the first optical transceiver; and

at least one controller to select, based on a signal from the one or more optical detectors of the OBS node, an anode in a multiple-anode photomultiplier tube and align an angular field of view of the second optical transceiver with the first optical transceiver.

11. The system of claim 9, wherein the retrieval device comprises:

the one or more controllers 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 transceiver with the second optical transceiver;

12. The system of claim 9, wherein the first optical transceiver comprises a solid state light sources comprising at least one of an InGaN based light source, an LED, and a laser.

13. The system of claim 9, wherein the first optical transceiver comprises at least one of a photomultiplier tube, a silicon photodiode, a silicon PIN photodiode, an avalanche photodiode, and a hybrid photodiode.

14. A method of optically transferring seismic data through an aqueous medium, comprising:

transmitting, by a retrieval device comprising a first optical transmitter and a first optical receiver, light;

detecting, by an ocean bottom seismic (“

OBS”

) node comprising a second optical receiver having one or more optical detectors, a presence of the retrieval device based on the light transmitted by the first optical transmitter of the retrieval device;

sensing, by the OBS node, a relative angle of the first optical transmitter of the retrieval device;

adjusting, by one or more controllers of the OBS node, responsive to identification of an underwater environmental condition, a transmission parameter used by a second optical transmitter to transmit the seismic data;

controlling, by the OBS node, the second optical transmitter to direct light to the first optical receiver of the retrieval device based on the relative angle of the first optical transmitter of the retrieval device sensed by the one or more optical detectors;

entering, by the second optical transmitter of the OBS node, a power up state responsive to detection, by the second optical receiver, of the presence of the retrieval device;

transmitting, by the OBS node, the seismic data through the aqueous medium using light based on the transmission parameter adjusted by the controller, the light directed towards the first optical receiver based on the relative angle;

receiving, by the first optical receiver of the retrieval device, the light corresponding to the seismic data transmitted through the aqueous medium by the second optical transmitter of the OBS node;

generating, by a photodiode of the first optical receiver, electrical output based on the light received by the first optical receiver from the second optical transmitter; and

adjusting, by an automatic gain control amplifier of the retrieval device, a level of the electrical output received from the first optical receiver.

15. The method of claim 14, comprising:

sensing, by one or more optical detectors of the retrieval device, the relative angle of the second optical transmitter; and

selecting, by at least one controller of the retrieval device, 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.

16. The method of claim 14, comprising:

selecting, by the one or more controllers of the OBS node, based on a signal from the one or more optical detectors of the OBS node, an anode in a multiple-anode photomultiplier tube; and

aligning, by the OBS node, an angular field of view of the second optical receiver with the first optical transmitter.

17. The method of claim 14, wherein the second optical transmitter comprises a solid state light sources comprising at least one of an InGaN based light source, an LED, and a laser.

18. The method of claim 14, wherein the second optical receiver comprises at least one of a photomultiplier tube, a silicon photodiode, a silicon PIN photodiode, an avalanche photodiode, and a hybrid photodiode.

19. The method of claim 14, comprising:

steering, by one or more diffractive optical elements of the OBS node, an optical transmission beam towards the retrieval device.

20. The method of claim 14, comprising:

transmitting, by the OBS node to the retrieval device, the seismic data using a multi-carrier transmission modulation technique.