# US 2018/0026727 A1 · High-bandwidth underwater data communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0026727 A1 - Document ID: US20180026727A1 - Status: Published application - Kind: A1 - Application number: 15/664,697 - Filed: 2017-07-31 - Published: 2018-01-25 - Earliest claimed: 2013-03-15 - Assignees: Fairfield Industries Incorporated - Applicants: Fairfield Industries Incorporated - Inventors: Philip Lacovara - Web page: https://patentgrep.com/patent/US20180026727A1 ## CPC - 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 - G01V 1/226: {Optoseismic systems} - G08C 23/04: using light waves, e.g. infrared - H04B 10/503: {Laser transmitters} - H04B 13/02: Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy - H04B 10/112: Line-of-sight transmission over an extended range - H04B 10/1123: {Bidirectional transmission} - H04B 10/6931: {Automatic gain control of the preamplifier} - H04L 27/2601: {Multicarrier modulation systems} - H04L 27/2697: {in combination with other modulation techniques} - H04B: TRANSMISSION - G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02) - G08C: TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS (fluid pressure transmitting systems F15B; mechanical means for transferring the output of a sensing member into a different variable G01D5/00; mechanical control systems G05G) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## 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 ### Claim at position 1 1-44. (canceled) ### Claim 45 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 placed on an ocean bottom, the 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 light with the seismic data, and control the second optical transmitter to direct the light with the seismic data through the aqueous medium 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 of the OBS node placed on the ocean bottom to transmit the light with seismic data through the aqueous medium using the transmission parameter adjusted by the one or more controllers, the light with the seismic data directed towards the first optical receiver through the aqueous medium by the one or more controllers of the OBS node placed on the ocean bottom; the first optical receiver of the retrieval device to receive the light with the seismic data transmitted through the aqueous medium by the second optical transmitter of the OBS node placed on the ocean bottom; a photodiode of the first optical receiver that generates electrical output based on the light with the seismic data transmitted by the second optical transmitter and received by the first optical receiver; 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. ### Claim 46 (depends on 45) The system of claim 45, comprising: the retrieval device mounted on a remotely operated vehicle. ### Claim 47 (depends on 45) The system of claim 45, comprising: the retrieval device mounted on an autonomous underwater vehicle. ### Claim 48 (depends on 45) The system of claim 45, comprising: the retrieval device to receive the seismic data from the OBS node placed on the ocean bottom, and store the seismic data in memory of the retrieval device. ### Claim 49 (depends on 45) The system of claim 45, comprising: 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. ### Claim 50 (depends on 45) The system of claim 45, 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. ### Claim 51 (depends on 45) The system of claim 45, 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. ### Claim 52 (depends on 45) The system of claim 45, 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. ### Claim 53 (depends on 45) The system of claim 45, 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. ### Claim 54 (depends on 45) The system of claim 45, wherein the OBS node comprises one or more diffractive optical elements to steer an optical transmission beam towards the retrieval device. ### Claim 55 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 placed on an ocean bottom and 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 light with the seismic data, controlling, by the one or more controllers of the OBS node, the second optical transmitter to direct the light with the seismic data through the aqueous medium 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; transmitting, by the second optical transmitter of the OBS node placed on the ocean bottom, light with seismic data through the aqueous medium using the transmission parameter adjusted by the one or more controllers, the light with the seismic data directed towards the first optical receiver through the aqueous medium by the one or more controllers of the OBS node placed on the ocean bottom; receiving, by the first optical receiver of the retrieval device, the light with the seismic data transmitted through the aqueous medium by the second optical transmitter of the OBS node placed on the ocean bottom; generating, by a photodiode of the first optical receiver, electrical output based on the light with the seismic data transmitted by the second optical transmitter and received by the first optical receiver; and adjusting, by an automatic gain control amplifier of the retrieval device, a level of the electrical output. ### Claim 56 (depends on 55) The method of claim 55, wherein the retrieval device is mounted on a remotely operated vehicle. ### Claim 57 (depends on 55) The method of claim 55, wherein the retrieval device is mounted on an autonomous underwater vehicle. ### Claim 58 (depends on 55) The method of claim 55, comprising: storing, by the retrieval device in memory, the seismic data received from the OBS node placed on the ocean bottom. ### Claim 59 (depends on 55) The method of claim 55, comprising: entering, by the second optical transmitter, a power up state responsive to detection, by the second optical receiver, of the presence of the retrieval device. ### Claim 60 (depends on 55) The method of claim 55, 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, based on a signal from the one or more optical detectors of the retrieval device, an anode in a multiple-anode photomultiplier tube to align an angular field of view of the first optical receiver with the second optical transmitter. ### Claim 61 (depends on 55) The method of claim 55, comprising: selecting, by the one or more controllers, based on a signal from the one or more optical detectors of the OBS node, an anode in a multiple-anode photomultiplier tube to align an angular field of view of the second optical receiver with the first optical transmitter. ### Claim 62 (depends on 55) The method of claim 55, 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. ### Claim 63 (depends on 55) The method of claim 55, 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. ### Claim 64 (depends on 55) The method of claim 55, comprising: steering, by one or more diffractive optical elements of the OBS node, an optical transmission beam towards the retrieval device.