GILBERT FAIN
Broker in East Freetown, MA

6859419, Feb 22, 2005

Aug 18, 2003

10/644574

Fletcher A. Blackmon - Forestdale MA, US
Lynn T. Antonelli - Cranston RI, US
Lee E. Estes - Mattapoisett MA, US
Gilbert Fain - East Freetown MA, US

The United States of America as represented by the Secretary of the Navy - Washington DC

H04B011/00

367134, 367 3

An apparatus for enabling acousto-optic communication comprising an in-water platform comprising means for emitting an acoustic signal to an acousto-optic interaction zone, an in-air platform comprising the ability for transmitting a first optical interrogation beam, the ability for receiving a portion of the first interrogation beam and a second laser beam formed from the reflection of the first interrogation beam off of the acousto-optic interaction zone, the ability for measuring and outputting a plurality of optical interferences between the portion of the first interrogation beam and the second reflected beam, and a signal converter receiving as input the plurality of optical interferences and outputting an electrical signal representing the received acoustic telemetry signal at the interrogation point at the air-water interface.

7505366, Mar 17, 2009

Jun 16, 2006

11/454457

Fletcher A. Blackmon - Forestdale MA, US
Lee E. Estes - Mattapoisett MA, US
Gilbert Fain - East Freetown MA, US

The United States of America as represented by the Secretary of the Navy - Washington DC

H04B 11/00

367134

The present application provides a linear mechanism for optical-to-acoustic energy conversion for optoacoustic communication from an in-air platform to an undersea vehicle. Signals used in underwater acoustic telemetry applications are capable of being generated through the linear optoacoustic regime conversion process. A number of issues concerning linear optoacoustic communication is addressed that lead to a formulation of a linear regime optoacoustic communication scheme. The use of oblique laser bean incidence at an air-water interface to obtain considerable in-air range from the laser source to the vehicle is also addressed. The effect of oblique incidence on in-water range is addressed as well. Optimum and sub-optimum linear optoacoustic sound-generation techniques for selecting the optical wavelength and signal frequency for optimizing in-water range are identified. Optoacoustic techniques employing M-ary frequency shift keying and multifrequency shift keying are compared with communication parameters such as bandwidth, data rate, range coverage and number of lasers employed.

7613074, Nov 3, 2009

Jan 3, 2006

11/326679

Fletcher A. Blackmon - Forestdale MA, US
Lee E. Estes - Mattapoisett MA, US
Gilbert Fain - East Freetown MA, US
Lynn T. Antonelli - Cranston RI, US

The United States of America as represented by the Secretary of the Navy - Washington DC

H04B 11/00

367134

The present invention includes a system and method of use for communications from an in-air platform to a submerged platform. The system includes a laser positionable on the in-air platform above a water medium that sends a pulsed information-bearing laser beam containing a modulated communications signal to create and react in a non-linear regime manner with the water medium at an air/water interface. The beam vaporizes and optically breaks down a portion of the water medium, creates a shock wave and generates bubble oscillations at the vaporized portion. An acoustic sensor on the submerged platform detects these shock wave oscillations within the water medium and a demodulator-decoder that identifies these broadband acoustic transients that contain deterministically placed energy and demodulates-decodes the acoustic transients into the transmitted communications signals from the in-air platform.