Optical communication device, method and system
Exemplary optical communication devices are described which, in certain embodiments, derive power optically from and communicate optically to a reading device. The communication devices may also receive data from modulated light from the reading device to achieve a bi-directional optical communication link between the self-powered optical communication device and the reading device. In some embodiments, the communication device is powered by ambient light, such as sunlight, captures data from a sensor, and communicates the stored data some time later to a reading device. In some embodiments, the communication device is powered locally and communicates through air, optical fiber, or other medium with another communication device.
1. A communication device, comprising:
a light emitting diode (“LED”) configurable for both receiving and emitting light; and
circuitry coupled to the LED and configured to transmit and receive optical data using the LED, wherein the circuitry comprises voltage boost circuitry configured to boost a voltage generated by the LED upon receiving light to produce a higher voltage than generated by the LED from the received light.
2. The communication device of claim 1 , wherein the circuitry is configured to transmit and receive the optical data at different times to provide bi-directional communication over a common medium.
3. The communication device of claim 2 , wherein the medium is entirely air.
4. The communication device of claim 2 , wherein the medium is an optical fiber.
5. The communication device of claim 2 , wherein the circuitry is further configured to receive optical data modulated between two different optical power levels.
6. The communication device of claim 5 , wherein the circuitry is configured to receive optical data encoded to prevent long strings of optical data without transitions.
7. The communication device of claim 6 , wherein the received optical data is bi-phase encoded.
8. The communication device of claim 7 , wherein the circuitry comprises a one-shot configured to provide a receive clock as an output.
9. The communication device of claim 7 , wherein the circuitry comprises a phase locked loop, the phase lock loop being utilized to provide a receive clock.
10. The communication device of claim 2 , wherein each bit of transmitted optical data is represented by a presence or an absence of a light pulse.
11. The communication device of claim 1 , wherein the circuitry comprises a controller integrated circuit.
12. The communication device of claim 1 , wherein the circuitry comprises memory circuitry configured to store data.
13. The communication device of claim 12 , wherein the memory circuitry comprises programmable memory circuitry configured to store data representing optical data received by the communication device.
14. The communication device of claim 12 , wherein the data comprises identification information.
15. The communication device of claim 1 , wherein the voltage boost circuitry comprises two capacitors configured to be charged by the LED in a parallel configuration and to drive the LED in a series configuration.
16. A communication device, comprising:
a light emitting diode (“LED”) configurable for both emitting light and receiving light; and
circuitry configured to generate power for the communication device from incident light on the LED and to transmit optical data from the communication device using the LED, wherein the circuitry comprises voltage boost circuitry configured to boost a voltage generated by the LED upon receiving the incident light to produce a higher voltage than generated by the LED from the incident light.
17. The communication device of claim 16 , wherein the incident light comprises modulated optical data.
18. The communication device of claim 16 , wherein the incident light comprises ambient light.
19. The communication device of claim 18 , wherein the circuitry is configured to transmit optical data at periodic intervals.
20. The communication device of claim 19 , further comprising a sensor having output signals, the optical data representing output signals from the sensor.
21. The communication device of claim 16 , wherein the circuitry comprises a one-shot configured to provide a receive clock as an output.
22. The communication device of claim 16 , wherein the voltage boost circuitry comprises two capacitors configured to be charged by the LED in a parallel configuration and to drive the LED in a series configuration.
23. A method, comprising:
receiving optical data with a communication device wherein said receiving comprises configuring a light emitting diode (“LED”) to receive incident light comprising the optical data;
boosting a voltage generated by the LED upon receiving the incident light to produce a higher voltage than generated by the LED from the incident light; and
transmitting data from the communication device, wherein said transmitting comprises configuring the same LED to emit light comprising the data, and wherein the same LED is configured to emit light by driving the same LED with the higher voltage.
24. A method, comprising:
powering a communication device by incident light received via a light emitting diode (“LED”);
boosting a voltage generated by the LED upon receiving the incident light to produce a higher voltage than generated by the LED from the incident light; and
transmitting data from the communication device using the same LED by driving the same LED with the higher voltage, so that the LED is configured to emit light comprising the data.