Optical communication systems and methods
An underwater system including at least one input device that is in sensory communication with water and generates input signals. The system further includes at least one optical transmitter and at least one optical receiver that allow omni-directional transmission and reception through water of optical signals representing the input signals, and allow data rates greater than 1 Mbps.
1. An underwater communication system, comprising:
at least one input device capable of being in sensory communication with water and capable of generating input signals;
a transmitter having a source capable of emitting electromagnetic radiation representative of the input signals, and a diffuser having a substantially hemispherical surface, for transmitting the electromagnetic radiation at a rate of at least 1 Mbps along a plurality of radii defined by the surface for diffusing the electromagnetic radiation and disposed in a position surrounding a portion of the source for diffusing the electromagnetic radiation in a plurality of directions; and
a receiver having a substantially hemispherical surface for receiving the electromagnetic radiation along a plurality of radii defined by the surface and being capable of detecting electromagnetic radiation passing at least 20 m through a high light scattering medium, such that the electromagnetic radiation can be received in substantially any direction;
wherein the transmitter and the receiver are physically separated from each other; and
wherein the electromagnetic radiation includes electromagnetic waves of wavelength in the optical spectrum between 300 nm and 800 nm.
2. The system of claim 1 wherein the at least one input device includes a motion sensor.
3. The system of claim 2 wherein the motion sensor detects vibrations transmitted through the water.
4. The system of claim 1 wherein the at least one input device includes a seismic sensor.
5. The system of claim 1 wherein the at least one input device includes an acoustic sensor.
6. The system of claim 1 wherein the transmitter includes a plurality of sources.
7. The system of claim 6 wherein each of the plurality of sources are individually controllable.
8. The system of claim 1 wherein the source includes at least one of a light emitting diode, a laser diode, and a photodiode.
9. An underwater communication system, comprising:
at least two nodes that can transmit and receive electromagnetic radiation, at least one node including at least one input device capable of generating input signals, each node including:
a transmitter having a source capable of emitting electromagnetic radiation, and a diffuser having a substantially hemispherical surface, for transmitting the electromagnetic radiation at a rate of at least 1 Mbps along a plurality of radii defined by the surface for diffusing the electromagnetic radiation and disposed in a position surrounding a portion of the source for diffusing the electromagnetic radiation in a plurality of directions; and
a receiver having a substantially hemispherical surface for receiving the electromagnetic radiation along a plurality of radii defined by the surface and being capable of detecting electromagnetic radiation passing at least 20 m through a high light scattering medium, such that the electromagnetic radiation can be received in substantially any direction;
wherein the at least two nodes are physically separated from each other, and at least one node includes a transmitter having a source capable of emitting electromagnetic radiation representative of the input signals of the input device; and
wherein the electromagnetic radiation includes electromagnetic waves of wavelength in the optical spectrum between 300 nm and 800 nm.
10. The system of claim 9 wherein at least one of the at least two nodes includes a mobile unit.
11. The system of claim 9 wherein at least one of the at least two nodes includes a stationary unit.